WO2005122218A1 - 露光装置及びデバイス製造方法 - Google Patents
露光装置及びデバイス製造方法 Download PDFInfo
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- WO2005122218A1 WO2005122218A1 PCT/JP2005/010412 JP2005010412W WO2005122218A1 WO 2005122218 A1 WO2005122218 A1 WO 2005122218A1 JP 2005010412 W JP2005010412 W JP 2005010412W WO 2005122218 A1 WO2005122218 A1 WO 2005122218A1
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- Prior art keywords
- liquid
- substrate
- exposure apparatus
- exposure
- optical system
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
- H01L21/0274—Photolithographic processes
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70216—Mask projection systems
- G03F7/70341—Details of immersion lithography aspects, e.g. exposure media or control of immersion liquid supply
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B27/00—Photographic printing apparatus
- G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
- G03B27/42—Projection printing apparatus, e.g. enlarger, copying camera for automatic sequential copying of the same original
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2041—Exposure; Apparatus therefor in the presence of a fluid, e.g. immersion; using fluid cooling means
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70216—Mask projection systems
- G03F7/70258—Projection system adjustments, e.g. adjustments during exposure or alignment during assembly of projection system
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/708—Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
- G03F7/70858—Environment aspects, e.g. pressure of beam-path gas, temperature
- G03F7/70866—Environment aspects, e.g. pressure of beam-path gas, temperature of mask or workpiece
- G03F7/70875—Temperature, e.g. temperature control of masks or workpieces via control of stage temperature
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/708—Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
- G03F7/70908—Hygiene, e.g. preventing apparatus pollution, mitigating effect of pollution or removing pollutants from apparatus
- G03F7/70916—Pollution mitigation, i.e. mitigating effect of contamination or debris, e.g. foil traps
Definitions
- the present invention relates to an exposure apparatus for exposing a substrate via a projection optical system and a liquid, and a device manufacturing method.
- Semiconductor devices and liquid crystal display devices are manufactured by a so-called photolithography technique in which a pattern formed on a mask is transferred onto a photosensitive substrate.
- An exposure apparatus used in the photolithography process has a mask stage for supporting a mask and a substrate stage for supporting a substrate, and sequentially moves the mask stage and the substrate stage to project a pattern of the mask through a projection optical system. Transfer to the substrate.
- further improvement in the resolution of the projection optical system has been desired in order to cope with higher integration of device patterns.
- the resolution of the projection optical system increases as the exposure wavelength used decreases and as the numerical aperture of the projection optical system increases. Therefore, the exposure wavelength used in the exposure apparatus is becoming shorter year by year, and the numerical aperture of the projection optical system is also increasing.
- the mainstream exposure wavelength is 248 nm of KrF excimer laser, and 193 nm of short wavelength ArF excimer laser is being put to practical use.
- the depth of focus (D ⁇ F) is also important, as is the resolution.
- the resolution R and the depth of focus ⁇ are respectively represented by the following equations.
- ⁇ is the exposure wavelength
- ⁇ is the numerical aperture of the projection optical system
- k the process coefficient
- Equations (1) and (2) show that when the exposure wavelength is shortened and the numerical aperture NA is increased in order to increase the resolution R, the depth of focus ⁇ becomes narrower.
- Patent Document 1 WO 99/49504 pamphlet
- the present invention has been made in view of such circumstances, and an object of the present invention is to provide an exposure apparatus and a device manufacturing method capable of accurately performing an exposure process and a measurement process based on a liquid immersion method.
- the present invention employs the following configuration corresponding to Figs. 1 to 9 shown in the embodiment.
- the exposure apparatus (EX) of the present invention forms an immersion area (AR2) of the liquid (LQ) on the image plane side of the projection optical system (PL), and the projection optical system (PL) and the immersion area (
- an exposure apparatus that exposes the substrate (P) through the liquid (LQ) of (AR2)
- at least one of the property and component of the liquid (LQ) for forming the liquid immersion area (AR2) is measured.
- a measuring device (60) is provided.
- the measuring device measures at least one of the property and the component of the liquid, and determines whether the liquid is in a desired state based on the measurement result.
- Power S can. If there is a problem with the liquid, Quick treatment can be performed quickly. Therefore, the exposure process and the measurement process via the liquid can be performed with high accuracy.
- the properties or components of the liquid measured by the measuring device include the specific resistance of the liquid, total organic carbon (T ⁇ C) in the liquid, and fine particles contained in the liquid.
- Foreign matter including particles or bubbles, dissolved gas containing dissolved oxygen (D ⁇ ) and dissolved nitrogen (DN), silica concentration in liquid, viable bacteria, and the like.
- the exposure apparatus (EX) of the present invention forms an immersion area (AR2) of the liquid (LQ) on the image plane side of the projection optical system (PL), and the projection optical system (PL) and the immersion area (
- AR2 immersion area
- PL projection optical system
- the functional liquid supply device supplies the functional liquid to the predetermined member that comes into contact with the liquid, so that the predetermined member can be brought into a desired state with respect to the liquid. Therefore, even if there is a defect in the predetermined member or the liquid in contact with the predetermined member, the functional liquid is supplied in accordance with the defect to maintain or convert the liquid in contact with the predetermined member to a desired state. can do. Therefore, the exposure processing and the measurement processing via the liquid can be performed with high accuracy.
- the exposure apparatus (EX) of the present invention forms a liquid immersion area (AR2) of the liquid (LQ) on the image plane side of the projection optical system (PL), and forms the projection optical system (PL) and the liquid immersion area (AR).
- a liquid supply mechanism (10) for supplying the liquid (LQ) is provided.
- the storage device stores the detection result in association with the shot area on the substrate.
- a device manufacturing method uses the above-described exposure apparatus (EX). According to the present invention, a device can be manufactured in a state in which exposure accuracy and measurement accuracy are well maintained, so that a device exhibiting desired performance can be manufactured.
- EX exposure apparatus
- the liquid immersion area (AR2) of the liquid (LQ) is formed on the image plane side of the projection optical system (PL), and the projection optical system and the liquid in the liquid immersion area are formed.
- a method of maintaining an exposure apparatus (EX) for exposing a substrate (P) through a liquid the method including a step of replacing a liquid forming an immersion area with a functional liquid (LK) having a predetermined function. It is.
- ADVANTAGE OF THE INVENTION According to this invention, the part which the liquid which forms the liquid immersion area
- exposure processing and measurement processing via a liquid can be performed with high accuracy.
- FIG. 1 is a schematic configuration diagram showing one embodiment of an exposure apparatus of the present invention.
- FIG. 2 is an enlarged view of a main part of FIG. 1.
- FIG. 3 is a schematic configuration diagram showing a liquid supply unit.
- FIG. 4 is a view of the substrate stage PST viewed from above.
- FIG. 5 is a flowchart for explaining an exposure method according to the present invention.
- FIG. 6A is a schematic diagram for explaining a liquid recovery operation by first and second liquid recovery mechanisms.
- FIG. 6B is a schematic view for explaining a liquid recovery operation by the first and second liquid recovery mechanisms.
- FIG. 7 is an enlarged view of a main part showing another embodiment of the exposure apparatus of the present invention.
- FIG. 8 is a flowchart illustrating an example of a maintenance method using a functional liquid.
- FIG. 9 is a flowchart illustrating an example of a semiconductor device manufacturing process.
- Measuring device 61-64... Measuring instrument (measuring device), 61K-64K... Branch pipe (branch flow path), 70... First nose nose member, 70 ⁇ ... Liquid contact surface, 80... Second nose nose member, 80 ⁇ ... Liquid contact Surface, 90... Detection device, 120... Functional liquid supply device (washing device), 161... Pure water production device (adjustment device), 162... Ultra pure water production device (adjustment device), 173... Degassing device (adjustment device) , 174 ...
- FIG. 1 is a schematic configuration diagram showing an embodiment of the exposure apparatus of the present invention.
- the exposure apparatus EX includes a mask stage MST capable of holding and moving a mask M, a substrate stage PST capable of holding and moving a substrate P, and a mask stage MST.
- the optical system IL illuminates the mask M with the exposure light EL
- the projection optical system PL projects and exposes the pattern image of the mask M illuminated with the exposure light EL onto the substrate P held on the substrate stage PST.
- a control unit CONT that controls the overall operation of the exposure apparatus EX.
- the control device CONT is connected to a notifying device INF for notifying information regarding the exposure processing.
- the notification device INF uses a display device (display device), sound or light. It is configured to include an alarm device that issues an alarm (warning).
- a storage device MRY for storing information related to the exposure processing is connected to the control device CONT.
- the entire exposing unit EX is driven by 100A commercial power (first driving source) supplied by a power company.
- the exposure apparatus EX of the present embodiment is an immersion exposure apparatus to which the immersion method is applied in order to substantially shorten the exposure wavelength and improve the resolution and to substantially widen the depth of focus.
- the exposure apparatus EX uses the liquid LQ supplied from the liquid supply mechanism 10 to at least partially transfer the pattern image of the mask M onto the substrate P including the projection area AR1 of the projection optical system PL while transferring the pattern image on the substrate P.
- the liquid immersion area AR2 larger than the projection area AR1 and smaller than the substrate P is locally formed.
- the exposure apparatus EX is a local immersion method that fills the liquid LQ between the optical element 2 at the image plane side end of the projection optical system PL and the surface of the substrate P disposed on the image plane side.
- the pattern of the mask M is applied to the substrate P by irradiating the substrate P with the liquid LQ between the projection optical system PL and the substrate P and the exposure light EL passing through the mask M via the projection optical system PL.
- the controller CONT supplies a predetermined amount of the liquid LQ onto the substrate P by using the liquid supply mechanism 10 and collects a predetermined amount of the liquid LQ on the substrate P by using the first liquid recovery mechanism 20 so that the substrate P A liquid immersion area AR2 of the liquid LQ is locally formed on the upper part.
- the second liquid recovery mechanism 30 recovers the liquid LQ supplied from the liquid supply mechanism 10 and not recovered by the first liquid recovery mechanism 20.
- the exposure apparatus EX includes a measuring apparatus 60 that measures at least one of the property and the component of the liquid LQ for forming the liquid immersion area AR2.
- the measuring device 60 measures the liquid LQ supplied by the liquid supply mechanism 10.
- the liquid supply mechanism 10 includes a functional liquid supply device 120 capable of supplying a functional liquid having a predetermined function different from the liquid LQ for forming the liquid immersion area AR2.
- the exposure apparatus EX also includes a detection device 90 that detects whether or not the second liquid recovery mechanism 30 has recovered the liquid LQ.
- the optical element near the image plane side of the projection optical system PL specifically, the optical element at the image plane side end of the projection optical system PL
- a first nozzle member 70 which will be described in detail later, is arranged.
- the first nozzle member 70 is an annular member provided above the substrate 3 (substrate stage PST) so as to surround the optical element 2.
- a second nozzle member 80 different from the first nozzle member 70 is disposed outside the first nozzle member 70 with respect to the projection area AR1 of the projection optical system PL.
- the second nozzle member 80 is an annular member provided so as to surround the first nozzle member 70 above the substrate P (substrate stage PST).
- the first nozzle member 70 constitutes a part of each of the liquid supply mechanism 10 and the first liquid recovery mechanism 20.
- the second nozzle member 80 constitutes a part of the second liquid recovery mechanism 30.
- the exposure apparatus EX a scanning type that exposes a pattern formed on the mask M to the substrate P while synchronously moving the mask M and the substrate P in different directions (opposite directions) in the running direction.
- An example in which an exposure apparatus (a so-called scanning stepper) is used will be described.
- the direction that coincides with the optical axis AX of the projection optical system PL is the Z-axis direction
- the direction of synchronous movement (scanning direction) between the mask M and the substrate P in a plane perpendicular to the Z-axis direction is the X-axis direction
- the direction perpendicular to the Z-axis direction and the X-axis direction (non-scanning direction) is the Y-axis direction.
- the directions of rotation (tilt) around the X, Y, and Z axes are the ⁇ ⁇ , 6 ⁇ , and 62 directions, respectively.
- the exposure apparatus ⁇ includes a base BP provided on a floor surface, and a main column 1 provided on the base BP.
- the main column 1 is formed with an upper step 7 and a lower step 8 projecting inward.
- the illumination optical system IL illuminates the mask M supported by the mask stage MST with the exposure light EL.
- the illumination optical system IL is supported by a support frame 3 fixed above the main column 1.
- the illumination optical system IL includes an exposure light source, an opticanole integrator for equalizing the illuminance of the light beam emitted from the exposure light source, a condenser lens for collecting the exposure light EL from the opticanore integrator, It has a relay lens system, a variable field stop that sets the illumination area on the mask M by the exposure light EL in a slit shape, and the like.
- a predetermined illumination area on the mask M is illuminated by the illumination optical system IL with exposure light EL having a uniform illuminance distribution.
- Illumination optical system IL power Exposure light EL emitted is, for example, ultraviolet emission lines (g-line, h-line, i-line) emitted from a mercury lamp and far ultraviolet light (KrF excimer laser light (wavelength: 248 nm)). DUV light) And vacuum of ArF excimer laser light (wavelength 193 nm) and F laser light (wavelength 157 nm)
- VUV light Ultraviolet light
- ArF excimer laser light is used.
- pure water is used as the liquid LQ.
- Pure water can be used not only for ArF excimer laser light but also for deep ultraviolet light (DUV light) such as ultraviolet emission lines (g-line, h-line, i-line) emitted from a mercury lamp and KrF excimer laser light (wavelength 248 nm). ) Is also permeable.
- DUV light deep ultraviolet light
- the mask stage MST is movable while holding the mask M.
- the mask stage MST holds the mask M by vacuum suction (or electrostatic suction).
- a plurality of gas bearings (air bearings) 45 which are non-contact bearings, are provided on the lower surface of the mask stage MST.
- the mask stage MST is supported by the air bearing 45 in a non-contact manner with respect to the upper surface (guide surface) of the mask platen 4. Openings MK1 and MK2 that allow the pattern image of the mask M to pass therethrough are formed in the center of the mask stage MST and the mask base 4, respectively.
- the mask platen 4 is supported on the upper step 7 of the main column 1 via a vibration isolator 46.
- the mask stage MST is configured to be supported by the main column 1 (upper step 7) via the vibration isolator 46 and the mask base 4. Also, the mask base 4 and the main column 1 are vibrated and separated by the vibration isolator 46 so that the vibration of the main column 1 is not transmitted to the mask base 4 supporting the mask stage MST. .
- the mask stage MST is driven by a mask stage driving device MSTD including a linear motor and the like controlled by the control device CONT. It can be moved two-dimensionally in a plane perpendicular to the optical axis AX, that is, in the XY plane, and can be slightly rotated in the ⁇ Z direction.
- the mask stage MST is movable at the specified running speed in the X-axis direction, and the X-axis movement stroke is sufficient to move at least the entire surface of the mask M across the optical axis AX of the projection optical system PL. have.
- a movable mirror 41 is provided on the mask stage MST. Further, a laser interferometer 42 is provided at a position facing the movable mirror 41.
- the position of the mask M on the mask stage MST in the two-dimensional direction, and the rotation angle in the ⁇ Z direction (in some cases, the rotation angle in the ⁇ X and ⁇ Y directions) Are measured in real time by the laser interferometer 42.
- the measurement result of the laser interferometer 42 is output to the control device CONT.
- the control device CONT drives the mask stage driving device MSTD based on the measurement result of the laser interferometer 42, and controls the position of the mask M held by the mask stage MST.
- the projection optical system PL projects and exposes the pattern of the mask M onto the substrate ⁇ at a predetermined projection magnification ⁇ , and includes a plurality of optical elements including the optical element 2 provided at the tip of the substrate ⁇ .
- the optical elements are supported by a lens barrel ⁇ .
- the projection optical system PL is a reduction system in which the projection magnification / 3 is, for example, 1Z4, 1/5, or 1/8. Note that the projection optical system PL may be either a unity magnification system or an enlargement system.
- the optical element 2 at the tip of the projection optical system PL of the present embodiment is exposed from the lens barrel PK, and the liquid LQ in the liquid immersion area AR2 comes into contact with the optical element 2.
- a flange PF is provided on the outer periphery of the lens barrel PK holding the projection optical system PL, and the projection optical system PL is supported by the lens barrel base 5 via the flange PF.
- the lens barrel base 5 is supported on the lower step 8 of the main column 1 via a vibration isolator 47. That is, the projection optical system PL is configured to be supported by the main column 1 (lower step portion 8) via the vibration isolator 47 and the barrel base 5.
- the lens barrel base 5 and the main column 1 are vibrated by the vibration isolator 47 so that the vibration of the main column 1 is not transmitted to the barrel base 5 that supports the projection optical system PL. I have.
- the substrate stage PST is movable while supporting a substrate holder PH that holds the substrate P.
- the substrate holder PH holds the substrate P by, for example, vacuum suction or the like.
- a plurality of gas bearings (air bearings) 48, which are non-contact bearings, are provided on the lower surface of the substrate stage PST.
- the substrate stage PST is supported by the air bearing 48 in a non-contact manner with respect to the upper surface (guide surface) of the substrate surface plate 6.
- the substrate surface plate 6 is supported on a base BP via a vibration isolator 49.
- the vibration isolator 49 prevents the vibration of the base BP (floor surface) and the main column 1 from being transmitted to the substrate platen 6 supporting the substrate stage PST, so that the substrate platen 6, the main column 1 and the base BP ( And the floor) are separated by vibration.
- the substrate stage PST holds the substrate P via the substrate holder PH by driving a substrate stage driving device PSTD including a linear motor and the like controlled by the controller CONT. In this state, it can be moved two-dimensionally in the XY plane and slightly rotated in the ⁇ Z direction on the substrate platen 6. Further, the substrate stage PST can move in the Z-axis direction, the ⁇ X direction, and the ⁇ Y direction.
- a movable mirror 43 is provided on the substrate stage PST.
- a laser interferometer 44 is provided at a position facing the movable mirror 43. The position and the rotation angle of the substrate P on the substrate stage PST in the two-dimensional direction are measured by the laser interferometer 44 in real time.
- the exposure apparatus EX detects positional information on the surface of the substrate P supported by the substrate stage PST as disclosed in, for example, JP-A-8-37149.
- An oblique incidence type focus leveling detection system is provided.
- the focus leveling detection system may employ a system using a capacitance type sensor.
- the focus' leveling detection system detects the position information of the surface of the substrate P in the Z-axis direction and the tilt information of the substrate P in the ⁇ X and ⁇ Y directions.
- the measurement result of the laser interferometer 44 is output to the control device CONT.
- the detection result of the focus leveling detection system is also output to the controller CONT.
- the control device CONT drives the substrate stage driving device PSTD based on the detection result of the focus leveling detection system, controls the focus position and the inclination angle of the substrate P, and auto-focuses the surface of the substrate P.
- the position of the substrate P in the X-axis direction and the Y-axis direction is controlled based on the measurement result of the laser interferometer 44 while adjusting the position to the image plane of the projection optical system PL by the method and the auto-leveling method.
- a recess 50 is provided on the substrate stage PST, and a substrate holder PH for holding the substrate P is arranged in the recess 50.
- the upper surface 51 of the substrate stage PST other than the concave portion 50 has a flat surface (flat portion) which is almost the same height (level) as the surface of the substrate P held by the substrate holder PH.
- the upper surface of movable mirror 43 is also provided substantially flush with upper surface 51 of substrate stage PST.
- the upper surface 51 substantially flush with the surface of the substrate P is provided around the substrate P, even when the edge area of the substrate P is subjected to immersion exposure, a step is formed outside the edge of the substrate P. Since there is almost no force, it is possible to maintain the liquid LQ on the image plane side of the projection optical system PL and to form the liquid immersion area AR2 well. Also, the edge of the substrate P and the flat surface (upper surface) 0): There is a gap of about 2 mm from the surface 51, but the liquid LQ hardly flows into the gap due to the surface tension of the liquid LQ. The liquid LQ can be held below the projection optical system PL by the upper surface 51.
- the liquid supply mechanism 10 is for supplying the liquid LQ to the image plane side of the projection optical system PL, and includes a liquid supply section 11 capable of sending out the liquid LQ, and one end portion of the liquid supply section 11. And a supply pipe 13 for connecting the same. The other end of the supply pipe 13 is connected to a first knurling member 70.
- the liquid supply mechanism 10 supplies pure water
- the liquid supply unit 11 includes a pure water production device 16 and a temperature controller for adjusting the temperature of the supplied liquid (pure water) LQ.
- the device 17 is provided.
- the pure water producing apparatus a pure water producing apparatus in a factory where the exposure apparatus EX is installed may be used without providing the pure water producing apparatus in the exposure apparatus EX.
- the liquid supply mechanism 10 supplies a predetermined amount of the liquid LQ onto the substrate P arranged on the image plane side of the projection optical system PL.
- a measuring device 60 is provided in the middle of the supply pipe 13, at least one of the property and the component of the liquid LQ which is sent from the liquid supply unit 11 of the liquid supply mechanism 10 and supplied to the image plane side of the projection optical system PL.
- a measuring device 60 is provided. As described above, since the liquid supply mechanism 10 supplies water as the liquid LQ, the measuring device 60 is configured by a device capable of measuring water quality.
- the first liquid recovery mechanism 20 is for recovering the liquid LQ on the image plane side of the projection optical system PL, and includes a first liquid recovery unit 21 capable of recovering the liquid LQ, and a first liquid recovery unit 21.
- the part 21 is provided with a collection pipe 23 connecting one end thereof. The other end of the recovery pipe 23 is connected to the first nozzle member 70.
- the first liquid recovery unit 21 includes, for example, a vacuum system (suction device) 26 such as a vacuum pump, and a gas-liquid separator 27 that separates the recovered liquid LQ from a gas.
- a vacuum system in the factory where the exposure apparatus EX is installed may be used without installing a vacuum pump in the exposure apparatus EX.
- the first liquid recovery mechanism 20 recovers a predetermined amount of the liquid LQ on the substrate P supplied from the liquid supply mechanism 10.
- the second liquid recovery mechanism 30 is for recovering the liquid LQ on the image plane side of the projection optical system PL.
- a second liquid recovery section 31 capable of recovering the liquid LQ and a recovery pipe 33 connecting one end of the second liquid recovery section 31 to the second liquid recovery section 31 are provided.
- the other end of the collection pipe 33 is connected to the second nozzle member 80.
- the second liquid recovery unit 31 includes, for example, a vacuum system (suction device) 36 such as a vacuum pump, a gas-liquid separator 37 for separating the recovered liquid LQ and gas.
- a vacuum system a vacuum system at the factory where the exposure apparatus EX is installed may be used without providing the vacuum pump in the exposure apparatus EX.
- the second liquid recovery mechanism 30 can recover the liquid LQ that cannot be completely recovered by the first liquid recovery mechanism 20.
- the second liquid recovery mechanism 30 has an uninterruptible power supply (second drive source) 100B that is different from the commercial power supply 100A that is the driving source of the entire exposure apparatus EX including the first liquid recovery mechanism 20. are doing.
- the uninterruptible power supply 100B supplies electric power (driving force) to the drive unit of the second liquid recovery mechanism 30 when, for example, the commercial power supply 100A fails.
- the second liquid recovery unit 31 of the second liquid recovery mechanism 30 is driven by power supplied from the uninterruptible power supply 100B.
- the liquid recovery operation of the second liquid recovery mechanism 30 including the second liquid recovery unit 31 is not controlled by the control device CONT, and for example, a command from another control device built in the second liquid recovery mechanism 30 It is controlled based on the signal.
- the uninterruptible power supply 100B may supply power to the control device CONT in addition to the second liquid recovery mechanism 30.
- the control device CONT which is driven by the electric power from the uninterruptible power supply 100B may control the liquid recovery operation of the second liquid recovery mechanism 30.
- the second liquid recovery mechanism 30 may be constantly driven by the uninterruptible power supply 100B.
- the first liquid recovery mechanism 20 and the second liquid recovery mechanism 30 are driven by different power supplies 100A and 100B, respectively.
- the liquid LQ recovered by the first liquid recovery mechanism 20 and the second liquid recovery mechanism 30 is returned to the liquid supply unit 11 of the liquid supply mechanism 10. That is, the exposure apparatus EX of the present embodiment has a configuration including a circulation system that circulates the liquid LQ between the liquid supply mechanism 10, the first liquid recovery mechanism 20, and the second liquid recovery mechanism 30. You.
- the liquid LQ returned to the liquid supply unit 11 of the liquid supply mechanism 10 is purified by the pure water production device 16 and then supplied again to the image plane side (on the substrate P) of the projection optical system PL.
- the first and second All of the liquid LQ recovered by the liquid recovery mechanisms 20 and 30 may be returned to the liquid supply mechanism 10, or a part thereof may be returned.
- the liquid LQ collected from the first and second liquid recovery mechanisms 20 and 30 is not returned to the liquid supply mechanism 10 but the liquid LQ supplied from another supply source or tap water is supplied to the pure water production apparatus 16. After purification, it may be supplied to the image plane side of the projection optical system PL. Further, a first mode in which the recovered liquid LQ is purified and returned to the liquid supply unit 11 and circulated again, and a second mode in which the recovered liquid LQ is discarded and a new liquid LQ is supplied from the liquid supply unit 11 are provided. The configuration may be switched as needed.
- connection pipe 9 One end of the connection pipe 9 is connected to a predetermined position in the supply pipe 13, and the other end is connected to a predetermined position in the collection pipe 23.
- a first valve 13B for opening and closing the flow path of the supply pipe 13 is provided, and in the middle of the collection pipe 23, a second valve 13B for opening and closing the flow path of the collection pipe 23.
- a valve 23B is provided, and a third valve 9B for opening and closing the flow path of the connection pipe 9 is provided in the middle of the connection pipe 9.
- the first valve 13B is provided closer to the first nozzle member 70 than the connection position of the supply pipe 13 with the connection pipe 9, and the second valve 23B is connected to the connection pipe 9 of the collection pipe 23. It is provided on the first lip member 70 side of the position.
- the operation of each valve 13B, 23B, 9B is controlled by the controller CONT.
- the valves 13B, 23B, and 9B change the flow path of the liquid LQ sent from the liquid supply unit 11.
- a timer 13T is connected to the first valve 13B.
- the timer 13T can measure the open time and the close time of the first valve 13B. Further, the timer 13T can detect whether or not the first valve 13B closes the flow path of the supply pipe 13.
- the timer 13T starts time measurement when detecting that the first valve 13B has opened the flow path of the supply pipe 13.
- the timer 13T can also start time measurement when detecting that the first valve 13B has closed the flow path of the supply pipe 13.
- the timer 13 measures the time elapsed since the first valve 13B opened the flow path of the supply pipe 13, that is, the time elapsed since the liquid supply by the liquid supply mechanism 10 was started. S can. Information on the elapsed time measured by the timer 13T is output to the control device CONT.
- the timer 13T is configured so that the first valve 13B When detecting that the road is closed, stop the time measurement operation and reset the measurement time (return to zero). Further, the timer 13T can measure an elapsed time from when the first valve 13B closes the flow path of the supply pipe 13, that is, an elapsed time after the liquid supply by the liquid supply mechanism 10 is stopped. .
- Information on the elapsed time measured by the timer 13T is output to the control device CONT.
- the timer 13T detects that the first valve 13B has opened the flow path of the supply pipe 13
- the timer 13T stops the time measurement operation and resets the measurement time (returns to zero).
- a first nozzle member 70 that constitutes a part of the liquid supply mechanism 10 and the first liquid recovery mechanism 20 is held by a first nozzle holding member 52, and the first nozzle holding member 52 is Connected to lower step 8.
- the second nozzle member 80 constituting a part of the second liquid recovery mechanism 30 is held by a second nozzle holding member 53, and the second nozzle holding member 53 is connected to the lower step 8 of the main column 1.
- the first nozzle member 70 and the second nozzle member 80 are independent members.
- FIG. 2 is an enlarged view of a main part showing the vicinity of the image plane side of projection optical system PL.
- a first nozzle member 70 is disposed near the optical element 2 at the distal end of the projection optical system PL, and is provided so as to surround the optical element 2 above the substrate P (substrate stage PST). This is the annular member provided.
- the first flap member 70 has a hole 70H at the center thereof in which the projection optical system PL (optical element 2) can be arranged.
- the lower surface 70A of the first nozzle member 70 is provided so as to face the substrate P held on the substrate stage PST. Further, the first nozzle member 70 held by the first nozzle holding member 52 (see FIG. 1) is separated from the projection optical system PL (optical element 2).
- a gap is provided between the inner surface of the first lip member 70, which is an annular member, and the outer surface of the optical element 2 of the projection optical system PL. This gap is provided for vibratingly separating the projection optical system PL and the first nose piece member 70. This prevents the vibration generated by the first nozzle member 70 from being transmitted to the projection optical system PL.
- the second nozzle member 80 is an annular member provided so as to surround the first nozzle member 70 above the substrate P (substrate stage PST).
- the second nozzle member 80 has a hole 80H at the center thereof, in which a part of the first nozzle member 70 can be arranged.
- the second nozzle section The lower surface 80A of the material 80 is provided so as to face the substrate P held on the substrate stage PST.
- the first nozzle holding member 70 held by the first nozzle holding member 52 is separated from the second nozzle member 80 held by the second nozzle holding member 53 (see FIG. 1). That is, a gap is provided between the inner surface of the second nozzle member 80, which is an annular member, and the outer surface of the first nozzle member 70. This gap is provided for vibratingly separating the first flap member 70 and the second flap member 80. This prevents the vibration generated in the second nozzle member 80 from being transmitted to the first nozzle member 70 side.
- the main column 1 supporting the first and second nozzle members 70 and 80 via the first and second nozzle holding members 52 and 53 and the lens barrel PK of the projection optical system PL are flanged.
- the lens barrel base 5 which is supported by a PF is separated from the lens barrel base 5 via a vibration isolator 47 in a vibrating manner. Therefore, the vibrations generated by the first knurling member 70 and the second knurling member 80 are prevented from being transmitted to the projection optical system PL.
- the main column 1 supports the first and second nozzle members 70 and 80 via the first and second nozzle holding members 52 and 53, and the base plate 6 supports the substrate stage PST. And are vibrationally separated via a vibration isolator 49.
- the main column 1 supports the first and second nozzle members 70 and 80 via the first and second nozzle holding members 52 and 53, and the mask base 4 supports the mask stage MST.
- the vibration generated in the first nozzle member 70 and the second nozzle member 80 is prevented from being transmitted to the mask stage MST via the main column 1.
- the lower surface 70 A of the first nozzle member 70 has a supply port 12 that constitutes a part of the liquid supply mechanism 10.
- the supply ports 12A and 12B are provided.
- two supply ports 12 (12A, 12B) are provided and provided on both sides in the X-axis direction with the optical element 2 (projection area AR1) of the projection optical system PL interposed therebetween.
- the supply ports 12A and 12B are formed in a substantially circular shape, but may be formed in an arbitrary shape such as an elliptical shape, a rectangular shape, or a slit shape.
- the supply ports 12A and 12B may have substantially the same size as each other, or may have different sizes.
- the first recovery port 22 constituting a part of the first liquid recovery mechanism 20 is provided outside the supply port 12 with respect to the projection area AR1 of the projection optical system PL. Is provided.
- the first recovery port 22 is formed in an annular shape on the lower surface 70A of the first nozzle member 70 so as to surround the projection area AR1 and the supply ports 12A and 12B.
- the first recovery port 22 is provided with a porous body 22P.
- the other end of the supply pipe 13 is connected to one end of the supply flow path 14 formed inside the first nozzle member 70.
- the other end of the supply channel 14 of the first nozzle member 70 is connected to the supply port 12 formed on the lower surface 70A of the first nozzle member 70.
- the supply flow path 14 formed inside the first nozzle member 70 branches from the middle so that the other end can be connected to each of the plurality (two) of supply ports 12 (12A, 12B). are doing.
- the liquid supply operation of the liquid supply unit 11 is controlled by the controller CONT.
- the control device CONT sends out the liquid LQ1 from the liquid supply unit 11 of the liquid supply mechanism 10.
- the liquid LQ sent out from the liquid supply unit 11 flows through the supply pipe 13 and then flows into one end of the supply flow path 14 formed inside the first knurling member 70. Then, the liquid LQ that has flowed into one end of the supply flow path 14 branches on the way, and then, through the plurality of (two) supply ports 12A and 12B formed on the lower surface 70A of the first nozzle member 70, the optical element 2 It is supplied to the space between the substrate P and.
- the other end of the recovery pipe 23 is connected to one end of a manifold flow path 24M that forms a part of the first recovery flow path 24 formed inside the first nozzle member 70.
- the other end of the manifold channel 24M is formed in an annular shape in plan view so as to correspond to the first recovery port 22, and one end of the first recovery channel 24 connected to the first recovery port 22 is formed. It is connected to a part of the annular flow path 24K constituting the part.
- the liquid recovery operation of the first liquid recovery unit 21 is controlled by the controller CONT.
- the controller CONT drives the first liquid recovery unit 21 of the first liquid recovery mechanism 20 to recover the liquid LQ.
- the liquid LQ on the substrate P is vertically upwardly directed to the annular flow path 24K via the first recovery port 22 provided above the substrate P (+ Z direction).
- the liquid LQ flowing into the annular flow path 24K in the + Z direction flows through the manifold flow path 24M after being collected in the manifold flow path 24M. Then liquid The body LQ is sucked and collected by the first liquid collecting part 21 via the collecting pipe 23.
- a second collecting roller 32 that constitutes a part of the second liquid collecting mechanism 30 is provided on the lower surface 80 A of the second nozzle member 80.
- the second recovery port 32 is formed in the lower surface 80A of the second nozzle member 80 facing the substrate P.
- the second nozzle member 80 is provided outside the first nozzle member 70, and the second recovery port 32 provided in the second nozzle member 80 has a second collection port 32 with respect to the projection area AR1 of the projection optical system PL.
- the configuration is such that it is provided further outside than the first collection port 22 provided in the 1 nozzle member 70.
- the second recovery port 32 is formed in an annular shape so as to surround the first recovery port 22.
- the other end of the recovery pipe 33 is connected to one end of a manifold flow path 34M that forms a part of the second recovery flow path 34 formed inside the second nozzle member 80.
- the other end of the manifold channel 34M is formed in an annular shape in a plan view so as to correspond to the second recovery port 32, and one end of the second recovery channel 34 connected to the second recovery port 32 is formed. It is connected to a part of the annular flow path 34K constituting the part.
- the liquid recovery operation of the second liquid recovery unit 31 is controlled by the controller CONT.
- the controller CONT drives the second liquid recovery section 31 of the second liquid recovery mechanism 30 to recover the liquid LQ.
- the liquid LQ on the substrate P is vertically upwardly directed to the annular flow path 34K via the second recovery port 32 provided above the substrate P (+ Z direction).
- the liquid LQ that has flowed into the annular flow path 34K in the + Z direction flows through the manifold flow path 34M after being collected in the manifold flow path 34M. Thereafter, the liquid LQ is sucked and collected by the second liquid collecting part 31 via the collecting pipe 33.
- the control device CONT performs the liquid recovery operation (suction operation) by the second liquid recovery mechanism 30 at all times during the immersion exposure of the substrate P and before and after the exposure.
- the measuring device 60 measures the properties or components (water quality) of the liquid LQ supplied by the liquid supply mechanism 10.
- the properties or components of the liquid LQ measured by the measuring device 60 are determined in consideration of the effect on the exposure accuracy of the exposure apparatus EX or the effect on the exposure apparatus EX itself.
- Table 1 is a table showing an example of the properties or components of the liquid LQ and the effects of the properties or components on the exposure accuracy of the exposure apparatus EX or the exposure apparatus EX itself.
- the properties or components of liquid LQ include specific resistance, metal ions, total organic carbon (TOC: tot al organic carbon), not-taken olive / bunore, live bacteria, 'dissolved oxygen (DO), dissolved nitrogen (DN) etc.
- items that affect the exposure accuracy of the exposure apparatus EX or the exposure apparatus EX itself include fogging of the lens (particularly the optical element 2) and watermarks (solidification of impurities in the liquid due to evaporation of the liquid LQ). (Residual deposits), deterioration of optical performance due to change in refractive index and scattering of light, influence on resist process (resist pattern formation), generation of mackerel of each member and the like.
- Table 1 summarizes which properties or components affect what performance and to what extent, and marks those that are expected to have a concern.
- the properties or components of the liquid LQ to be measured by the measuring device 60 are selected from Table 1 as necessary based on the exposure accuracy of the exposure device EX or the influence on the exposure device EX itself. Of course, all items may be measured, or properties or components not shown in Table 1 may be used.
- the measuring device 60 has a plurality of measuring instruments.
- the measuring device 60 includes, as measuring devices, a resistivity meter for measuring a resistivity value, a TOC meter for measuring total organic carbon, a particle counter for measuring foreign matter including fine particles and bubbles, DO analyzer for measuring dissolved oxygen (dissolved oxygen concentration), DN meter for measuring dissolved nitrogen (dissolved nitrogen concentration), silica meter for measuring silica concentration, and analysis of the type and amount of viable bacteria It can be provided with various analyzers and the like.
- total organic carbon, particle bubbles, dissolved oxygen, and specific resistance are selected as measurement items, and as shown in FIG.
- a measuring device 60 is used to measure the total organic carbon.
- the system includes a TOC meter 61, a particle counter 62 for measuring foreign substances including fine particles and air bubbles, a dissolved oxygen meter (DO meter) 63 for measuring dissolved oxygen, and a resistivity meter 64.
- the TOC meter 61 is connected to a branch pipe (branch flow path) 61K that branches off in the middle of a supply pipe (supply flow path) 13 connected to the supply port 12. Part of the liquid LQ sent out from the liquid supply unit 11 and flowing through the supply pipe 13 is supplied onto the substrate P from the supply port 12 of the first nozzle member 70, and the remaining part flows through the branch pipe 61K. Flows into the TOC total 61.
- the TOC meter 61 measures the total organic carbon (TOC) of the liquid LQ flowing through the branch channel formed by the branch pipe 61K.
- the particle counter 62, the dissolved oxygen meter 63, and the resistivity meter 64 are connected to branch pipes 62K, 63 ⁇ , and 64 ⁇ , respectively, branching from the middle of the supply pipe 13, and these branch pipes 62 ⁇ , 63 ⁇
- the divergent flow formed by 64 ⁇ Measure the foreign matter (fine particles or bubbles), dissolved oxygen, and specific resistance value in the liquid LQ flowing through the passage.
- the above-mentioned silica viable cell analyzer can also be connected to a branch pipe that branches from the middle of the supply pipe 13.
- the branch pipes 61K to 64K form independent branch flow paths, and the measuring instruments 61 to 64 are connected to the independent branch flow paths, respectively. . That is, the plurality of measuring instruments 61 to 64 are connected in parallel to the supply pipe 13 via the branch pipes 61 to 64. Depending on the configuration of the measuring instrument, the liquid LQ branched from the supply pipe 13 is measured by the first measuring instrument, and the liquid LQ that has passed through the first measuring instrument is measured by the second measuring instrument. As described above, a plurality of measuring instruments may be connected to the supply pipe 13 in series. Depending on the number and position of the branch pipes (branch points), the possibility of foreign matter (particles) increases.
- the number and position of the branch pipes should be set in consideration of the possibility of foreign matter generation.
- the same type of measuring instrument may be arranged at a plurality of positions along the supply pipe 13. With such an arrangement, it is possible to specify at which position in the supply pipe 13 the property or component of the liquid LQ has changed, and it is easy to find the cause of the change.
- the measuring device 60 measures the properties or components of the liquid LQ flowing in the branch flow path that branches from the middle of the supply flow path formed by the supply pipe 13 in an in-line manner. I have. Since the liquid LQ is constantly supplied to the measuring device 60 by adopting the in-line method, the measuring device 60 can always measure the properties or components (water quality) of the liquid LQ during exposure and before and after exposure. Configuration. That is, the measuring device 60 can measure the liquid LQ in parallel with the liquid immersion exposure operation on the substrate. The measurement result of the measuring device 60 is output to the control device CONT. The control device CONT can constantly monitor the property or component (water quality) of the liquid LQ supplied onto the substrate by the liquid supply mechanism 10 based on the measurement result of the measuring device 60.
- the liquid LQ was sampled, and the type of the metal ions was determined using an analyzer provided separately from the exposure apparatus ⁇ . Can be identified. This makes it possible to perform an appropriate treatment according to the specified metal ion.
- Q may be sampled, and the total evaporation residue amount in the liquid LQ may be measured by a total evaporation residue meter provided separately from the exposure apparatus EX.
- the analyzer and the total evaporation residue meter periodically and automatically sample the liquid LQ, and notify the exposure apparatus EX of the type of metal ions and the measurement results of the total evaporation residue meter. Yore, The exposure apparatus EX can compare the notified measurement result with a reference value stored in advance and issue an alarm when the measurement result exceeds the reference value.
- the detection device 90 detects whether or not the second liquid recovery mechanism 30 has recovered the liquid LQ.
- the detection device 90 optically detects whether or not the liquid LQ is flowing through the recovery pipe 33 of the second liquid recovery mechanism 30, and thereby detects the second recovery of the second liquid recovery mechanism 30. Detect if liquid LQ has been recovered through port 32.
- the detection device 90 includes a light emitting unit 91 that emits the detection light La, and a light receiving unit 92 that receives the detection light La. In the middle of the collection tube 33, transmission windows 93 and 94 through which the detection light La can pass are provided. The detection device 90 irradiates the detection light La from the light projecting section 91 to the transmission window 93.
- the detection light La that has passed through the transmission window 93 passes through the inside of the collection tube 33, and is received by the light receiving unit 92 through the transmission window 94.
- the light receiving result of the light receiving section 92 is output to the control device CONT.
- the amount of light received by the light receiving unit 92 differs between the case where the liquid LQ exists inside the collection tube 33 (on the optical path of the detection light La) and the case where there is no liquid LQ. Therefore, based on the light reception result of the light receiving section 92, the control device CONT determines whether or not the liquid LQ exists in the recovery pipe 33 (whether or not it is flowing), that is, the second recovery mechanism 30 recovers the liquid LQ. It is possible to determine whether or not force has been applied.
- the detection device 90 is a liquid presence / absence sensor provided inside the collection pipe 33 as long as it can detect whether or not the liquid LQ has been recovered through the second recovery port 32, for example. I'm sorry.
- the installation position of the liquid presence / absence sensor is not limited to the middle of the collection pipe 33, but may be, for example, in the vicinity of the second collection port 32 of the second knurling member 80 or inside the second collection flow path 34.
- a flow controller flow detector
- mass flow controller is provided in the middle of the recovery pipe 33, and based on the detection result of the mass flow controller, the second recovery port 32 is provided. Alternatively, it may be determined whether or not the liquid LQ has been recovered via the control unit.
- the detection device 90 including the light projecting unit and the light receiving unit, the mass flow controller
- the detection device including the roller can detect the liquid recovery amount per unit time by the second liquid recovery mechanism 30.
- FIG. 3 is a diagram showing the configuration of the liquid supply unit 11 in detail.
- the liquid supply unit 11 includes a pure water production device 16 and a temperature control device 17 for adjusting the temperature of the liquid LQ produced by the pure water production device 16.
- the pure water production device 16 includes, for example, a pure water production device 161 for purifying water containing suspended solids and impurities to produce pure water of a predetermined purity, and a pure water power produced by the pure water production device 161. Further, an ultrapure water producing device 162 for producing high-purity pure water (ultrapure water) by removing impurities is provided.
- the pure water generator 161 (or ultrapure water generator 162) includes a liquid reforming member such as an ion exchange membrane and a particle filter, and a liquid reforming device such as an ultraviolet light irradiation device (UV lamp). With these liquid reforming members and liquid reforming devices, the specific resistance value of the liquid, the amount of foreign substances (fine particles, bubbles), the total amount of organic carbon, and the amount of viable bacteria are adjusted to desired values.
- a liquid reforming member such as an ion exchange membrane and a particle filter
- a liquid reforming device such as an ultraviolet light irradiation device (UV lamp).
- the liquid LQ collected by the first liquid collection mechanism 20 and the second liquid collection mechanism 30 is returned to the liquid supply unit 11 of the liquid supply mechanism 10. .
- the liquid LQ recovered by the first liquid recovery mechanism 20 and the second liquid recovery mechanism 30 is supplied to the pure water production device 16 (pure water production device 161) of the liquid supply unit 11 via the return pipe 18.
- the return pipe 18 is provided with a valve 18B for opening and closing the flow path of the return pipe 18.
- the pure water production device 16 purifies the liquid returned through the return pipe 18 using the liquid reforming member, the liquid reforming device, and the like, and supplies the purified liquid to the temperature control device 17.
- a functional liquid supply device 120 is connected via a supply pipe 19 to the pure water production device 16 (pure water production device 161) of the liquid supply section 11.
- the functional liquid supply device 120 can supply a functional liquid LK having a predetermined function different from the liquid LQ for forming the liquid immersion area AR2.
- the functional liquid supply device 120 supplies a liquid (functional liquid) LK having a sterilizing action.
- the supply pipe 19 is provided with a valve 19B for opening and closing the flow path of the supply pipe 19. When the control device CONT operates the valve 18B to open the flow path of the return pipe 18 and supply the liquid LQ, it closes the flow path of the supply pipe 19 by operating the valve 19B to supply the functional liquid LK. Stop supply.
- control apparatus CONT closes the flow path of the return pipe 18 by operating the valve 18B to close the liquid. Stop supplying LQ.
- the temperature controller 17 adjusts the temperature of the liquid (pure water) LQ produced by the pure water producing device 16 and supplied to the supply pipe 13, and has one end thereof connected to the pure water producing device 16. (Ultra pure water production device 162), the other end is connected to the supply pipe 13, and after performing temperature adjustment of the liquid LQ produced by the pure water production device 16, the temperature-adjusted liquid The LQ is sent to the supply pipe 13.
- the temperature controller 17 includes a rough temperature controller 171 for roughly adjusting the temperature of the liquid LQ supplied from the ultrapure water generator 162 of the pure water generator 16, and a downstream side of the rough temperature controller 171 (supply pipe).
- a flow controller 172 called a mass flow controller that controls the amount of liquid LQ per unit time flowing to the supply pipe 13 side, and the dissolved gas concentration in the liquid LQ that has passed through the flow controller 172 (
- Degassing device 173 for lowering dissolved oxygen concentration and dissolved nitrogen concentration
- finoleta 174 for removing foreign substances (fine particles, bubbles) in liquid LQ degassed by degassing device 173, and passed through filter 174
- a fine temperature controller 175 for finely adjusting the temperature of the liquid LQ is provided.
- the rough temperature controller 171 adjusts the temperature of the liquid LQ sent from the ultrapure water production unit 162 to a target temperature (eg, 23 ° C.) with a coarse accuracy of, for example, about ⁇ 0.1 ° C. To do.
- the flow controller 172 is disposed between the rough temperature controller 171 and the deaerator 173, and controls the flow rate of the liquid LQ, the temperature of which has been adjusted by the rough temperature controller 171, to the deaerator 173 side per unit time. Control.
- the deaerator 173 is arranged between the rough temperature controller 171 and the fine temperature controller 175, specifically, between the flow controller 172 and the filter 174. Degas the sent liquid LQ to reduce the dissolved gas concentration in the liquid LQ.
- a known deaerator such as a decompression device that deaerates the supplied liquid LQ by reducing the pressure can be used.
- the degassing device 173 adjusts the dissolved gas concentration to a desired value by a liquid reforming member including the degassing filter and a liquid reforming device including the degassing pump.
- the filter 174 is disposed between the rough temperature controller 171 and the fine temperature controller 175, specifically, between the deaerator 173 and the fine temperature controller 175. It removes foreign substances in the delivered liquid LQ. When passing through the flow controller 172 or the deaerator 173, there is a possibility that particles may be slightly mixed in the liquid LQ. By providing the filter 174 on the pipe 13), foreign matter can be removed by the filter 174.
- the filter 174 a known filter such as a hollow fiber membrane filter or a particle filter can be used.
- the filter 174 including a liquid reforming member such as the above-described particle filter adjusts the amount of foreign matter (fine particles, bubbles) in the liquid to be equal to or less than an allowable value.
- the fine temperature controller 175 is disposed between the rough temperature controller 171 and the supply pipe 13, specifically, between the filter 174 and the supply pipe 13, and accurately detects the temperature of the liquid LQ. Make adjustments. For example, the fine temperature controller 175 adjusts the temperature (temperature stability and temperature uniformity) of the liquid LQ sent from the filter 174 to a target temperature with a high accuracy of about ⁇ 0.001 to 0.001 ° C. Make fine adjustments.
- the fine temperature controller 175 is arranged at the position closest to the substrate P to which the liquid LQ is supplied, among the plurality of devices constituting the temperature controller 17, so that the temperature is precisely controlled. The adjusted liquid LQ can be supplied onto the substrate P.
- the filter 174 is preferably disposed between the rough temperature controller 171 and the fine temperature controller 175 in the temperature controller 17, but is different from that in the temperature controller 17. It can be placed at a location, it can be placed outside the temperature control device 17, and so on.
- the pure water production device 161, the ultrapure water production device 162, the deaerator 173, and the filter 174 each include a liquid reforming member and a liquid reforming device. It constitutes an adjusting device for adjusting the water quality (property or component).
- Each of these devices 161, 162, 173, 174 has a configuration provided in each of a plurality of predetermined positions of the flow path of the liquid supply mechanism 10 through which the liquid LQ flows.
- one liquid supply unit 11 is provided for one exposure apparatus EX (see FIG. 1), but is not limited thereto. Can be shared with the exposure equipment EX. In this way, the area (footprint) occupied by the liquid supply unit 11 can be reduced.
- the pure water production device 16 and the temperature control device 17 constituting the liquid supply section 11 are divided into The manufacturing apparatus 16 may be shared by a plurality of exposure apparatuses EX, and the temperature control apparatus 17 may be arranged for each exposure apparatus EX. In this way, the footprint can be reduced and the temperature of each exposure apparatus can be controlled. Further, in the above case, if the liquid supply unit 11 or the pure water production apparatus 16 shared by a plurality of exposure apparatuses EX is arranged on a floor different from the floor on which the exposure apparatus EX is installed (for example, under the floor), the exposure apparatus The space in the clean room where the EX is installed can be used more effectively.
- FIG. 4 is a plan view of the substrate stage PST viewed from above.
- a plurality of shot areas S1 to S24 are set on a substrate P loaded (loaded) onto a substrate stage PST by a transport system (loader device) (not shown).
- Each of the plurality of shot areas S1 to S24 on the substrate P is provided with an alignment mark AM.
- a reference mark PFM measured by a substrate alignment system as disclosed in JP-A-4-65603 and a reference mark disclosed in JP-A-7-176468 are disclosed.
- a reference member (measurement member) 300 having a reference mark MFM measured by a mask alignment system as described above is arranged.
- an optical measurement unit for example, an illuminance non-uniformity sensor 400 as disclosed in JP-A-57-117238 and JP-A-2002-14005 are disclosed.
- an aerial image measurement sensor 500 and an irradiance sensor (illuminance sensor) 600 as disclosed in JP-A-11-16816 are provided.
- the upper surfaces of the measurement member 300 and the optical measurement units 400, 500, and 600 are substantially flush with the upper surface 51 of the substrate stage PST.
- the controller CONT determines the positional relationship (baseline amount) between the detection reference position of the substrate alignment system and the projection position of the pattern image of the mask M on the substrate alignment system.
- the measurement is performed using a mask alignment system, a reference member 300, and the like.
- the position of the substrate stage PST when the reference marks MFM and PFM on the reference member 300 are measured is measured by the laser interferometer 44.
- the control device CONT controls the optical measurement units 400 and 500 provided on the substrate stage PST.
- a measurement process is performed using the data 600 and 600, and various correction processes such as lens calibration are performed based on the measurement result (step SA1).
- the control device CONT controls the position of the substrate stage PST so that the projection optical system PL and the reference member 300 face each other, and the liquid supply mechanism With the liquid supply operation and the liquid recovery operation performed by the 10 and the first liquid recovery mechanism 20 and the liquid immersion area AR2 of the liquid LQ formed on the reference member 300, the reference member 300 is passed through the projection optical system PL and the liquid LQ. The upper reference mark MFM is measured.
- the control unit CONT forms the liquid immersion area AR2 of the liquid LQ on the optical measurement units 400, 500, and 600. In this state, perform measurement processing via liquid LQ.
- the control device CONT When supplying the liquid LQ from the liquid supply mechanism 10 onto the substrate stage PST including the measurement member and the optical measurement unit, the control device CONT closes the first pipe 9 with the third valve 9B closing the flow path of the connection pipe 9. The valve 13B is driven to open the flow path of the supply pipe 13.
- the control device CONT drives the second valve 23B to open the flow path of the recovery pipe 23.
- the liquid LQ in the liquid immersion area AR2 is the lower surface (liquid contact surface) 2A of the optical element 2 closest to the image plane in the projection optical system PL and the nozzle members 70 and 80. Contact the lower surface (liquid contact surface) of 70A and 80A. Further, the liquid LQ also comes into contact with the upper surface 51 of the substrate stage PST including the measuring member 300 and the optical measuring units 400, 500, and 600.
- the control unit CONT to the overlay exposure with respect to the substrate P, and Araimento mark AM formed in association with each of the plurality of shot areas S1 ⁇ S24 on the substrate! 3 Measure using a substrate alignment system.
- the position of the substrate stage PST when the substrate alignment system measures the alignment mark AM is measured by the laser interferometer 44.
- the control device CONT obtains position information of the shot areas S1 to S24 with respect to the detection reference position of the substrate alignment system in the coordinate system defined by the laser interferometer 44.
- the substrate stage PST By moving the substrate stage PST based on the positional information and the previously measured baseline amount, the projection position of the pattern image of the mask M and the shot areas S1 to S24 are aligned.
- the liquid immersion area AR2 when measuring the alignment mark AM and the reference mark PFM, the liquid immersion area AR2 is not formed on the substrate P (on the substrate stage PST), and the substrate alignment system is in a non-immersion state (dry state). Measure the alignment mark AM.
- the control device CONT drives the third vanolev 9B while the flow path of the supply pipe 13 is closed using the first valve 13B. To open the flow path of the connection pipe 9. In this way, the liquid LQ that has flowed into the supply pipe 13 from the liquid supply unit 11 including the temperature controller 17 flows through the connection pipe 9 to the recovery pipe 23.
- the liquid supply unit 11 including the temperature control device 17 is constantly driven, and when supplying the liquid to the image plane side of the projection optical system PL, the control device CONT operates the first valve By driving 13B to open the flow path of the supply pipe 13 and closing the flow path of the connection pipe 9 by the third valve 9B, the liquid LQ sent from the liquid supply unit 11 can be imaged by the projection optical system PL. Supply to the surface side.
- the control device CONT drives the third vanolev 9B to open the flow path of the connection pipe 9, and the flow of the supply pipe 13 is controlled by the first valve 13B. By closing the path, the liquid LQ sent from the liquid supply unit 11 is recovered by the liquid recovery unit 21 via the recovery pipe 23 without being supplied to the image plane side of the projection optical system PL.
- control device CONT outputs a command signal for starting immersion exposure (step SA2).
- the controller CONT closes the flow path of the connection pipe 9 by the third valve 9B with the optical element 2 of the projection optical system PL and a predetermined area on the substrate stage PST including the substrate P facing each other. Is driven to open the flow path of the supply pipe 13 and the supply of the liquid LQ onto the substrate P by the liquid supply mechanism 10 is started. Further, the control device CONT starts the liquid recovery by the first liquid recovery mechanism 20 almost simultaneously with the start of the supply of the liquid LQ by the liquid supply mechanism 10.
- the liquid supply amount per unit time by the liquid supply mechanism 10 and the liquid recovery amount per unit time by the first liquid recovery mechanism 20 are substantially constant.
- the liquid LQ in the liquid immersion area AR2 formed for performing liquid immersion exposure on the substrate P contacts the lower surface 2A of the optical element 2 and the lower surface 70A of the first nozzle member 70.
- the liquid recovery operation (suction operation) by the first liquid recovery mechanism 20 can be performed before the liquid supply by the liquid supply mechanism 10 is started (even when the liquid supply is stopped). Also, as described above, The two liquid recovery mechanism 30 is constantly driven, and the suction operation of the second liquid recovery mechanism 30 via the second recovery port 32 is constantly performed.
- the control device CONT sets the exposure light on the substrate P in a state where the projection optical system PL and the substrate P are opposed to each other.
- the pattern image of the mask M is exposed onto the substrate P via the projection optical system PL and the liquid LQ.
- the reason why the exposure is not performed until a predetermined time has elapsed from the opening of the first valve 13B is that bubbles generated by the operation of the valve may remain in the liquid immersion area AR2 immediately after the valve is opened. is there.
- the controller CONT controls the substrate stage PST supporting the substrate P while collecting the liquid LQ by the first liquid collection mechanism 20 in parallel with the supply of the liquid LQ by the liquid supply mechanism 10. Is moved in the X-axis direction (scanning direction), and the pattern image of the mask M is projected and exposed on the substrate P via the liquid LQ between the projection optical system PL and the substrate P and the projection optical system PL.
- the exposure apparatus EX in the present embodiment projects and exposes the pattern image of the mask M to the substrate P while moving the mask M and the substrate P in the X-axis direction (scanning direction). Then, a part of the pattern image of the mask M is projected into the projection area AR1 via the liquid LQ of the immersion area AR2 and the projection optical system PL, and the mask M is moved in the ⁇ X direction (or + X direction) at a speed V. In synchronization with the movement, the substrate P moves with respect to the projection area AR1 in the + X direction (or X direction) at a speed ⁇ ⁇ ⁇ ( ⁇ is a projection magnification).
- the next shot area is moved to the scanning start position by the stepping movement of the substrate P.
- the scanning exposure process is sequentially performed on each of the shot areas S1 to S24 while moving the substrate P in a scan mode.
- immersion exposure is performed on a shot area (for example, shot area Sl, S4, S21, S24, etc.) set in the peripheral area of the substrate P
- the liquid LQ of the immersion area AR2 that is larger than the projection area AR1 is applied to the substrate. Touches the upper surface 51 of the stage PST.
- control device CONT stores the measurement result of measurement device 60 in storage device MRY in association with the passage of time.
- the controller CONT uses the time when the first valve 13B opens the flow path of the supply pipe 13 as the measurement start point (reference) of the elapsed time, and uses the measurement result of the measurement device 60 as the time. It can be stored in the storage device MRY in association with the progress.
- first log information information that stores the measurement results of the measurement device 60 in association with the passage of time.
- the control device CONT stores the measurement result of the measurement device 60 in the storage device MRY in association with the shot areas S1 to S24 to be exposed.
- the control device CONT obtains the position information of the shot areas S1 to S24 in the coordinate system defined by the laser interferometer 44 based on, for example, the output of the laser interferometer 44 that measures the position of the substrate stage PST, and obtains the position information.
- the measurement result of the measuring device 60 when exposing the shot area for which the is determined can be stored in the storage device MRY in association with the shot area.
- the sampling port (branch pipe) of the measuring device 60 is supplied.
- the information stored in the storage device MRY may be corrected in consideration of the distance.
- information in which the measurement result of the measurement device 60 is stored in association with the shot area is referred to as “second log information” as appropriate.
- the control device CONT determines whether or not the measurement result of the measuring device 60 is abnormal (step SA4). Then, the control device CONT controls the exposure operation based on the determination result.
- the abnormal measurement result of the measuring device 60 means that each item (resistivity value, TOC, foreign matter, dissolved gas concentration, silica concentration, viable bacteria, etc.) measured by the measuring device 60 is abnormal. This refers to the situation where the measured value is out of the allowable range and the exposure processing and measurement processing via the liquid LQ cannot be performed in the desired state. For example, if the specific resistance of the liquid LQ is smaller than the allowable value (for example, 18.2 ⁇ 'cm at 25 ° C) (if abnormal), the liquid LQ contains a large amount of metal ions such as sodium ions.
- the liquid Q absorbs more light energy by the decrease in light transmittance, and the liquid temperature rises. Due to this temperature rise, the focal position of the projection optical system PL varies. Thus, a decrease in the light transmittance of the liquid LQ causes a decrease in exposure accuracy.
- the liquid LQ is required to have a certain light transmittance, and the value of total organic carbon (TOC) is correspondingly specified.
- the light transmittance required for a liquid LQ is greater than 99% per lmm thickness of the liquid LQ, and the corresponding TOC required for the liquid LQ is less than 1. Oppb.
- the amount of foreign matter containing fine particles or air bubbles in the liquid LQ is an allowable value (for example, those having a size of 0.1 / im or more are 0.1 / ml, more preferably 0.02 / ml). If the number is larger than that (if abnormal), the pattern transferred to the substrate P via the liquid LQ is more likely to have a defect.
- the value of the dissolved gas (dissolved gas concentration) containing dissolved oxygen and dissolved nitrogen in the liquid LQ is an allowable value (for example, 3 ppb for dissolved oxygen, more preferably lppb. For dissolved nitrogen, 3 ppm for example.
- the amount of viable bacteria is If (for example, 1. Ocfu / L, more preferably 0.1 lcfu / L), the liquid LQ will be contaminated and the light transmittance will be degraded.
- control device CONT continues the immersion exposure operation (step SA5).
- the control device CONT stops the exposure operation (step SA6).
- the controller CONT can also drive the first valve 13B to close the flow path of the supply pipe 13 and stop the supply of the liquid LQ. Further, after the exposure operation is stopped, the remaining liquid LQ on the substrate P may be recovered by using the nozzle member 70 and the first liquid recovery mechanism 20.
- the collected liquid LQ may be discarded without returning to the liquid supply unit 11, and a new liquid LQ may be injected into the liquid supply unit 11 to replace the entire liquid LQ. Further, after collecting the liquid LQ remaining on the substrate P, the substrate P may be unloaded from the substrate stage PST. By doing so, it is possible to prevent inconveniences such as the formation of a large number of defective shots (defective substrates) caused by continuing the exposure processing via the abnormal liquid LQ.
- the control device CONT notifies the measurement result (monitor information) of the measuring device 60 by the notification device INF (step SA7). For example, information on the amount of change in the dissolved gas concentration over time, such as the TOC contained in the liquid LQ, and exposure of a shot area (eg, shot area S15) among a plurality of shot areas S1 to S24.
- the information on the concentration of dissolved TOC and the dissolved gas contained in the liquid LQ at the time of reading can be displayed on the notification device INF including the display device.
- the control device CONT issues a warning (warning) with the notifying device INF and notifies the notifying device INF that the measurement result is abnormal, such as issuing an alarm (warning) with the notifying device INF. be able to. If the measuring device 60 has the same type of measuring device at a plurality of positions along the supply pipe 13, the control device CONT Can identify the section in which an abnormality has occurred based on the measurement results of those measuring instruments. Then, it is possible to notify the occurrence of an abnormality in a certain section by the notifying device INF to urge the investigation of the section, and to promptly recover the malfunction force.
- Unit 11 includes a liquid reforming member and a liquid reforming device, respectively, and includes a plurality of adjusting devices (pure water production device 161 and ultrapure water production device) for adjusting the water quality (properties or components) of liquid LQ. 162, deaerator 173, filter 174, etc.).
- the control device CONT can specify at least one of the plurality of adjustment devices based on the measurement result of the measurement device 60, and can notify the information on the specified adjustment device by the notification device INF. . For example, when it is determined that the dissolved gas concentration is abnormal based on the measurement result of the D ⁇ meter or the DN meter among the measuring devices 60, the control device CONT, for example, of the degassing device 173 among the plurality of adjusting devices.
- a message prompting the maintenance (inspection and replacement) of the degassing filter and degassing pump is displayed (notified) on the alarm device INF. Further, when it is determined that the specific resistance value of the liquid LQ is abnormal based on the measurement result of the specific resistance meter in the measuring device 60, the control device CONT, for example, of the pure water production device among the plurality of adjusting devices. Display (notify) the information prompting the maintenance (inspection / replacement) of the ion exchange membrane with the notification device INF.
- the control device CONT for example, of the plurality of adjusting devices, for example, the pure water producing device 16
- the information prompting the maintenance (inspection / replacement) of the ion-exchange membrane is displayed (notified) by the notification device INF.
- the control device CONT includes, for example, a pure water production device among the plurality of adjusting devices.
- the display urging the maintenance (inspection and replacement) of the 16 UV lamps is displayed (notified) by the notification device INF.
- the control device CONT includes, for example, one of the plurality of adjusting devices.
- a message prompting the maintenance (inspection / replacement) of the filter 174 or the particle filter of the pure water generator 16 is displayed (notified) on the notification device INF.
- the amount of viable bacteria in the liquid LQ was abnormal based on the analysis result of the viable cell analyzer in the measuring device 60.
- the control device CONT determines that this is the case, the control device CONT displays (notifies) the display urging the maintenance (inspection / replacement) of the UV lamp of, for example, the pure water production device 16 among the plurality of adjustment devices, using the notification device INF. Further, when it is determined that the silica concentration in the liquid LQ is abnormal based on the measurement result of the silica meter in the measuring device 60, the control device CONT, for example, of the plurality of adjusting devices, for example, the silica of the pure water production device 16 A message prompting the maintenance (inspection-replacement) of the removal filter is displayed (notified) on the notification device INF.
- control device CONT can also control the valve 18B according to the state of the water quality (property or component) of the liquid LQ to stop the circulation of the liquid LQ.
- the controller CONT collects and discards all the contaminated liquid LQ, injects a new liquid LQ into the liquid supply unit 11, and controls to replace the liquid LQ in the system with a new one. You can.
- control device CONT can continue the exposure operation even if it determines that an abnormality of liquid LQ has occurred. For example, when it is determined that the measurement result of the particle counter of the measuring device 60 during the exposure of the shot region S15 is abnormal, the control device CONT associates the particle with the shot region S15. The fact that the measurement result of the counter is abnormal is stored in the storage device MRY as the second log information. After exposing all the shot areas S1 to S24, based on the second log information stored in the storage device MRY, the control device CONT causes the pattern transfer failure due to the liquid LQ abnormality (the presence of foreign matter).
- the control device CONT may notify the fact that the measurement result of the particle counter is abnormal by the notification device INF in association with the shot area S15.
- the control device CONT can also display log information on the notification device INF.
- control device CONT can also control the exposure operation based on the measurement result of the measuring device 60.
- the irradiation amount (illuminance) of the exposure light EL is measured using the light measurement unit 600 (step SA1), and based on the measurement result.
- the force at which the exposure operation starts after the exposure dose (illuminance) of the exposure light EL is optimally set (corrected), for example, due to fluctuations in the TOC in the liquid LQ during exposure of the substrate P. Therefore, the light transmittance of the liquid LQ may fluctuate.
- the exposure amount (integrated exposure amount) on the substrate P fluctuates, and as a result, inconveniences such as a variation in the exposure line width of the device pattern formed in the shot area occur. May occur. Therefore, the relationship between T ⁇ C in the liquid LQ and the light transmittance of the liquid LQ at that time is previously obtained and stored in the storage device MRY, and the control device CONT uses the stored information and the measurement device 60 (TOC By controlling the amount of exposure based on the measurement result of the total 61), the above-mentioned inconvenience can be prevented.
- control device CONT derives the light transmittance according to the fluctuation of the TOC in the liquid LQ based on the stored information, and controls the exposure amount reaching the substrate P to be constant.
- the amount of exposure on the substrate P according to the change in TOC measured by the TOC meter 61, the amount of exposure within the substrate (between shots) or between substrates becomes constant, and the variation in the exposure line width Can be suppressed.
- the relationship between the TOC and the light transmittance of the liquid LQ can be obtained by a measurement process using the light measuring unit 600 via the liquid LQ.
- the substrate P is controlled by controlling the energy (light amount) per pulse or controlling the number of pulses.
- the amount of exposure above can be controlled.
- the amount of exposure on the substrate P can be controlled by controlling the scanning speed of the substrate P.
- the measurement operation (step SA1) using the optical measurement unit 600 is performed at predetermined time intervals or at predetermined processing substrate numbers during the exposure sequence, and the above-described exposure amount correction control is performed during the exposure sequence. This is performed during the measurement operation, and is reset every measurement operation.
- the liquid LQ for forming the liquid immersion area AR2 is formed based on the measurement result. It is possible to determine whether the state is the desired state (whether the state is abnormal). If the measurement result of the measuring device 60 is abnormal, appropriate measures for bringing the liquid LQ into a desired state are promptly performed, and the exposure operation is controlled to prevent the deterioration of the exposure accuracy. Can be. Also, based on the measurement result of the measuring device 60, the liquid LQ is By setting the desired state, the accuracy of the measurement process using the measurement member and the optical measurement unit via the liquid LQ can be maintained.
- an appropriate measure for adjusting the amount of the foreign matter to a desired value (maintenance of the particle filter). ) Can prevent inconveniences such as defects in the transferred pattern. If the value of dissolved oxygen (dissolved nitrogen) in the liquid LQ is judged to be abnormal based on the measurement results of the DO meter 63 (or DN meter), the dissolved oxygen (dissolved nitrogen) value By taking appropriate measures (maintenance of the degassing pump, etc.) promptly to achieve the desired value, it is possible to prevent the generation of bubbles and the occurrence of inconvenience such as defects in the transferred pattern. S can.
- the viable bacteria analyzer based on the analysis results of the viable bacteria analyzer, appropriate measures to quickly bring the amount of viable bacteria to a desired value can be promptly performed, or the value of the silica concentration can be determined based on the measurement results of the silica meter.
- the quality of the liquid pure water
- the exposure accuracy and measurement accuracy via the liquid LQ can be maintained.
- the liquid LQ may flow out of the first recovery port 22 because the first liquid recovery mechanism 20 cannot collect the liquid LQ. Also, if an abnormality occurs in the first liquid recovery mechanism 20 and liquid recovery operation becomes impossible, or if an abnormality occurs in the liquid supply mechanism 10 and malfunctions, a large amount of liquid LQ is supplied. There is a possibility that a situation may occur in which the liquid LQ cannot be completely recovered by the first liquid recovery mechanism 20 alone. In this case, the second liquid recovery mechanism 30 recovers the liquid LQ that has not been completely recovered by the first liquid recovery mechanism 20 and has flowed out of the first recovery port 22 through the second recovery port 32.
- Figure 6A As shown in the schematic diagram, when the first liquid recovery mechanism 20 has completely recovered the liquid LQ, the liquid LQ is not recovered from the second recovery port 32 of the second nosepiece member 80, and only the gas (air) is recovered. Will be recovered.
- the first liquid recovery mechanism 20 cannot collect the liquid LQ and the liquid LQ flows out of the first recovery port 22, the second nozzle member 80 (2) From the recovery port 32, the liquid LQ and the surrounding gas are recovered together (as if they were penetrated).
- the second liquid recovery mechanism 30 it is possible to prevent the liquid LQ from flowing out of the substrate P (on the substrate stage PST).
- the first liquid recovery mechanism 20 since the first liquid recovery mechanism 20 recovers only the liquid LQ, the first liquid recovery mechanism 20 does not generate large vibration when recovering the liquid LQ.
- the second liquid recovery mechanism 30 is configured to recover the liquid LQ together with the surrounding gas, and when recovering the liquid LQ from the second recovery port 32 of the second liquid recovery mechanism 30, If the collected gas is also collected (penetrated) together, the collected liquid LQ will be in the form of droplets and will collide with the inner wall of the collection channel and the collection pipe, possibly causing vibration at the second nozzle member 80 .
- the vibration When vibration occurs in the second nozzle member 80, the vibration is transmitted to the first nozzle member 70 via the lower step 8 of the main column 1, and the liquid LQ immersion area AR2 in contact with the first nozzle member 70 May vibrate, and may vibrate the substrate P or the substrate stage PST in contact with the liquid immersion area AR2.
- the second nozzle member 80 and the projection optical system PL are vibrated by the vibration isolator 47, but the vibration generated by the second nozzle member 80 causes the projection optical system PL to vibrate.
- the imaging characteristics via the projection optical system PL and the liquid LQ may be degraded.
- the vibration generated by the second nozzle member 80 causes the liquid LQ in the liquid immersion area AR2 to vibrate, and the vibration may deteriorate the imaging characteristics.
- step S In (Al) whether or not the second liquid supply mechanism 30 has recovered the liquid LQ is constantly detected (monitored) by the detection device 90.
- the detection result of the detection device 90 is output to the control device CONT, and the control device CONT stores the detection result (monitor information) of the detection device 90 in the storage device MRY (step SA8).
- Control device CONT stores the detection result of detection device 90 in storage device MRY in association with the passage of time. For example, based on the output of the timer 13T, the controller CONT uses the time when the first valve 13B opens the flow path of the supply pipe 13 as a measurement start point (reference) of the time lapse, and uses the detection result of the detection device 90 as a time. It can be stored in the storage device MRY in association with the progress. In the following description, information that stores the detection result of the detection device 90 in association with the passage of time is referred to as “third log information” as appropriate.
- the control device CONT stores the measurement result of the detection device 90 in the storage device MRY in association with the shot areas S1 to S24 to be exposed.
- the control device CONT obtains the position information of the shot areas S1 to S24 in the coordinate system defined by the laser interferometer 44 based on, for example, the output of the laser interferometer 44 that measures the position of the substrate stage PST, and obtains the position information.
- the detection result of the detection device 90 when exposing the shot area for which is obtained can be stored in the storage device MRY in association with the shot area. The time when the liquid LQ on the substrate P (on the shot area) is recovered through the second recovery port 32 and the time when the recovered liquid LQ flows through the recovery pipe 23 and is detected by the detector 90.
- a time lag occurs in accordance with the distance between the detection area of the detection device 90 (corresponding to the positions of the transmission windows 93 and 94) and the second recovery port 32. You can correct the information stored in MRY. In the following description, information in which the detection result of the detection device 90 is stored in association with the shot area is appropriately referred to as “fourth log information”.
- the detection device 90 can detect the liquid recovery amount per unit time by the second liquid recovery mechanism 30.
- the control device CONT stores information on the liquid recovery amount per unit time detected by the detection device 90 in the storage device MRY. Further, the information on the liquid recovery amount per unit time may be stored as the third log information in association with the passage of time, or may be stored as the fourth log information in association with the shot area. it can.
- the detection device 90 By providing the detection device 90 for detecting whether or not the second liquid recovery mechanism 30 has recovered the liquid LQ, the state during the liquid immersion exposure can be changed to a desired state based on the measurement result. State can be determined.
- the control device CONT determines whether or not vibration has occurred due to the liquid recovery operation of the second liquid recovery mechanism 30 when the substrate P (shot area) is being exposed. Can be determined. It is highly likely that the pattern transfer accuracy of the shot area where the pattern image of the mask M was exposed in the state where the vibration is occurring has deteriorated. Therefore, based on the detection result of the detection device 90, the control device CONT takes appropriate measures to prevent manufacturing of a defective shot (defective substrate) and to maintain good exposure accuracy and measurement accuracy. Can be applied.
- Control device CONT determines whether second liquid recovery mechanism 30 has recovered liquid LQ based on the detection result of detection device 90 (step SA9). Then, the control device CONT controls the exposure operation based on the determination result. Specifically, when the second liquid recovery mechanism 30 determines that the liquid LQ has not been recovered during the immersion exposure (during the supply of the liquid LQ), the controller CONT continues the immersion exposure operation ( Step SA5). On the other hand, when the second liquid recovery mechanism 30 determines that the liquid LQ has been recovered during the liquid immersion light (during supply of the liquid LQ), the controller CONT stops the exposure operation (step SA6). After the exposure operation is stopped, the substrate P may be unloaded from the substrate stage PST.
- the control device CONT determines that the second liquid recovery mechanism 30 has recovered the liquid LQ based on the detection result of the detection device 90, for example, it stops the liquid supply from the liquid supply mechanism 10. You may do so.
- the second liquid recovery mechanism 30 recovers the liquid LQ, there is a high possibility that the liquid LQ has flowed out.In such a case, the liquid supply from the liquid supply mechanism 10 is stopped, and the liquid LQ is recovered. Outflow can be prevented.
- the control device CONT stops power supply to an electrical device such as an actuator (linear motor) for driving the substrate stage PST, for example. It may be.
- Second liquid recovery mechanism 30 is liquid LQ When liquid LQ is collected, there is a high possibility that liquid LQ has flowed out.In such a case, by stopping power supply to electrical equipment, even if Can be prevented from occurring.
- control device CONT notifies the detection result (monitor information) of detection device 90 by using notification device INF (step SA7).
- an alarm may be issued from the notification device INF including an alarm device to the effect that the second liquid recovery mechanism 30 has recovered the liquid LQ.
- Information on whether or not the recovery mechanism 30 has recovered the liquid LQ can be displayed on a notification device INF including a display device.
- the detection device 90 can detect the liquid recovery amount per unit time by the second liquid recovery mechanism 30, the notification device INF can also display the liquid recovery amount.
- the control device CONT determines that the second liquid recovery mechanism 30 has recovered the liquid LQ
- the control device CONT can continue the exposure operation. Then, for example, when the second liquid recovery mechanism 30 determines that the liquid LQ has been recovered while exposing the shot area S15, the control device CONT associates the second liquid recovery mechanism 30 with the shot area S15 and exposes the second liquid recovery mechanism. 30 stores the recovered liquid LQ in the storage device MRY as fourth log information. Then, after exposing all the shot areas SI to S24, based on the fourth log information stored in the storage device MRY, the controller CONT controls the liquid recovery of the second liquid recovery mechanism 30 (generation of vibration).
- the shot area S15 in which a pattern transfer failure may have occurred due to this may be removed, or measures may be taken such as not to expose during the next superposition exposure.
- the shot area S15 is inspected, and if there is no abnormality in the formed pattern, device formation using the shot area S15 without removing the shot area S15 is continued.
- the control device CONT may associate the shot region S15 with the notification device INF to notify that the second liquid recovery mechanism 30 has recovered the liquid LQ when the shot region S15 is exposed.
- the control device CONT includes, in addition to the configuration in which the detection result of the detection device 90 is displayed as monitor information in real time on the notification device INF, the log information Can be displayed on the notification device INF.
- the first shot region (the plurality of shot regions S1 to S24 set on the substrate P)
- the detection device 90 waits until the detection device 90 stops detecting the liquid LQ.
- the second shot area (S16) following S15) is to be exposed.
- the time during which the second liquid recovery mechanism 30 recovers the liquid LQ is longer than the irradiation time of the exposure light EL to one shot area (for example, several hundred milliseconds) (for example, If a plurality of shot areas are continuously exposed for several seconds), the plurality of shot areas will be exposed in a state where vibration occurs. Therefore, a waiting time is provided after the exposure of the first shot area, and after waiting until the detecting device 90 stops detecting the liquid collected by the second liquid collecting mechanism 30 (after waiting until the vibration stops), the waiting time is set for the shot area. By restarting the exposure operation, the occurrence of defective shots can be suppressed.
- an acceleration sensor (vibration sensor) is provided on the second nozzle member 80, and after exposing the first shot area, waiting until the detection value of the vibration sensor becomes equal to or less than the allowable value, and then performing the second shot. You can also expose the area.
- the control device CONT stops the supply of the liquid LQ through the supply port 12 by the liquid supply mechanism 10. Then, the liquid LQ remaining on the substrate P or the substrate stage PST is collected through the first liquid collecting section 22 of the first liquid collecting mechanism 20 and the second collecting port 32 of the second liquid collecting mechanism 30. I do. Then, after finishing the operation of collecting the liquid LQ on the substrate P, the substrate P subjected to the exposure processing is unloaded from the substrate stage PST (step SA10).
- the control device CONT drives the third valve 9B to close the flow path of the connection pipe 9 while closing the flow path of the supply pipe 13 using the first valve 13B. Open.
- the liquid LQ flowing into the supply pipe 13 from the liquid supply section 11 including the temperature control device 17 flows into the recovery pipe 23 via the connection pipe 9, and when the liquid supply is unnecessary, the liquid supply section 11 feeds the power.
- the liquid LQ thus collected is not supplied onto the substrate P, but is collected by the liquid collecting section 21 through the collecting pipe 23.
- a new substrate P to be exposed is loaded on the substrate stage PST. Then, the above-described exposure sequence is repeated.
- the storage device MRY stores and stores the first to fourth log information described above.
- the storage device MRY stores the first and second log information relating to the properties or components (water quality) of the liquid LQ, and the third information relating to the liquid recovery operation (recovery status) of the second liquid recovery mechanism 30. And the fourth log information is stored. Using these log information, it is possible to analyze exposure failures (errors) and manage the exposure apparatus EX (step SA11).
- each adjusting device liquid reforming member and liquid reforming device constituting the liquid supply unit 11 is performed at an optimal timing. That power S can.
- the measured value of the particle counter is rapidly deteriorating with time, use a high-performance particle filter. If the value does not fluctuate significantly, use a relatively low-performance (low-cost) filter. The cost can be reduced by using a particle filter.
- the first log information is water quality information associated with the passage of time, it is possible to identify the power at which the water quality deteriorated at any point. Therefore, the cause of the exposure failure can be analyzed in association with the passage of time.
- the cause of a defect such as an exposure defect (pattern defect) using the first and second log information.
- the cause of failure can be analyzed and specified by collating and analyzing the inspection result with the first and second log information. For example, if a lot of exposure defects (pattern defects) occur in a specific lot or a specific shot area, refer to the second log information to expose and rewrite the lot (or shot area). If the measured value of “1” indicates an abnormal value, it can be analyzed that the cause of the pattern defect is foreign matter (fine particles, bubbles).
- the cause of the defect can be specified. Then, based on the analysis result, appropriate measures such as replacing the particle filter or the degassing filter can be taken so as not to cause a pattern defect.
- appropriate measures such as replacing the particle filter or the degassing filter can be taken so as not to cause a pattern defect.
- the correlation between the measured light transmittance of the liquid LQ by the optical measurement unit and the TOC, etc. The cause can be identified.
- control device CONT controls the exposure operation and the measurement operation based on the first and second log information. For example, if it is determined based on the first log information that the value of TOC is gradually deteriorating with the passage of time, the exposure apparatus EX sets the TOC value in accordance with the passage of time of the TOC stored as the first log information. By controlling the amount of exposure in accordance with the passage of time on the basis of the value (the amount of change), the amount of exposure between the substrates P can be made constant, and variations in the exposure line width can be reduced. As described above, when controlling the exposure amount, it is possible to adopt a method such as controlling the energy (light amount) per pulse, controlling the number of pulses, or controlling the scanning speed of the substrate P. is there.
- the third and fourth log information it is possible to analyze the cause of a defect (error) such as exposure failure (line width variation).
- a defect error
- line width variation variations in pattern exposure line width (including line width variations in the substrate and shots) are likely to occur. Therefore, specifically, when the substrate P is inspected in the inspection process, which is a subsequent process, after the substrate P is exposed, the inspection result is compared with the third and fourth port information to analyze the problem.
- the cause can be analyzed and specified. For example, when a lot of exposure failure (line width variation) occurs in a specific lot or specific shot area, the lot (or shot area) is exposed by referring to the fourth log information.
- the cause of the pattern defect is the vibration generated by the liquid recovery by the second liquid recovery mechanism 30. That can be S.
- the correlation between the detection result of the detection device 90 (the liquid recovery state of the second liquid recovery mechanism 30) stored as the third and fourth log information and the line width change is analyzed, (2) The influence of the liquid recovery operation by the liquid recovery mechanism 30 on the exposure accuracy can be determined, and the cause of the defect (variation in line width) can be specified.
- the synchronous movement accuracy between the mask M (mask stage MST) and the substrate P (substrate stage PST) or the projection optical system PL The alignment accuracy (focus accuracy) between the image plane and the substrate P surface via the liquid LQ deteriorates. Therefore, information on the liquid recovery operation (recovery status) of the second liquid recovery mechanism 30 is stored as the third and fourth log information, and the detection result of the detection device 90 (the liquid recovery status of the second liquid recovery mechanism 30) is stored.
- the influence on the exposure accuracy of the liquid recovery operation by the second liquid recovery mechanism 30 is determined, and the defect (degradation of the synchronous movement accuracy and focus accuracy) Can be identified.
- the second liquid recovery mechanism 30 does not recover the liquid LQ, It is possible to take appropriate measures such as changing the liquid supply amount, changing the liquid recovery amount per unit time by the first liquid recovery mechanism 20, and changing the moving speed (scanning speed) of the substrate P.
- the third log information is information on the liquid recovery operation of the second liquid recovery mechanism 30 associated with the passage of time
- the liquid LQ is recovered by the second liquid recovery mechanism 30 at any time. Power, can be identified. Therefore, the cause of the exposure failure can be analyzed in accordance with the passage of time.
- the control unit CONT can take measures such as removing the specific shot area or not exposing it at the next superposition exposure. Ah Alternatively, the control device CONT can issue an instruction to the inspection device that performs the inspection process to perform the inspection of the specific shot area in more detail than usual.
- the correlation between the liquid recovery state of the second liquid recovery mechanism 30 and the line width change, or the correlation between the synchronous movement accuracy and the focus accuracy is analyzed.
- the effect of the liquid recovery operation by the body recovery mechanism 30 on the exposure accuracy can be determined. Therefore, the pattern transfer accuracy on the substrate P when the second liquid recovery mechanism 30 recovers the liquid LQ can be obtained in advance.
- the degree of deterioration of the pattern transfer accuracy varies according to the liquid recovery amount per unit time by the second liquid recovery mechanism 30, so that the pattern transfer accuracy according to the liquid recovery amount can be obtained in advance. .
- the control device CONT detects the detection device 90. Based on the result and the stored information stored in the storage device MRY, the shot area on the substrate P to which the pattern of the mask M was transferred when the second liquid recovery mechanism 30 recovered the liquid LQ. Can be predicted. Then, the control device CONT can notify the predicted result by the notification device INF. Thus, after the exposure of the substrate P, if the predicted pattern transfer accuracy is equal to or more than the allowable value and is predicted as a defective shot, a measure such as removing the defective shot without going through the inspection process is used. Can be applied.
- the supplied liquid LQ is sampled at a predetermined timing, and the measurement is provided separately from the exposure apparatus EX.
- the liquid LQ may be measured (analyzed) using an apparatus (analyzer).
- an apparatus analyzer
- FIG. 1 In the above-described embodiment, for example, when it is desired to measure the components of viable bacteria in the liquid LQ, the supplied liquid LQ is sampled at a predetermined timing, and the measurement is provided separately from the exposure apparatus EX.
- an apparatus an apparatus
- sample the liquid LQ at a predetermined timing instead of using the inline method, sample the liquid LQ at a predetermined timing and measure it with a measuring device provided separately from the exposure apparatus EX. It may be.
- FIG. 1 In the embodiment shown in FIG.
- valves are provided in the branch pipes 61K to 63K, and by operating the valves, the liquid LQ flowing through the supply pipe 13 flows into the measuring device 60 at a predetermined timing, and LQ may be measured intermittently.
- the measurement by the measuring device 60 can be stabilized.
- the branch pipes 61K, 62 ⁇ , 63 ⁇ , and 64 ⁇ are connected to the supply pipe 13 between the liquid supply unit 11 and the first nozzle member 70, and the measuring device 60 In this case, the liquid LQ branched from the supply pipe 13 is measured.
- the branch pipe be provided as close as possible to the nozzle member 70 (close to the supply port 12).
- the branch pipes 61 ⁇ , 62 ⁇ , 63 ⁇ , and 64 ⁇ function as sampling ports for sampling the liquid LQ flowing through the supply pipe 13;
- the liquid LQ sampled by the branch flow path is measured from the middle of the supply pipe 13 between the first nozzle member 70 and the liquid LQ, and a sampling port is provided near the supply port 12 of the first nozzle member 70, for example.
- the measuring device 60 may measure the liquid LQ flowing near the supply port 12.
- the sampling port may be provided between the pure water production device 16 and the temperature control device 17 or immediately downstream of the temperature control device 17.
- a sampling port may be provided in the connection pipe 9 so that the measuring device 60 measures the liquid LQ flowing through the connection pipe 9.
- the measuring device 60 ′ may measure the liquid LQ collected by the first liquid collecting mechanism 20.
- the measuring device 65 of the measuring device 60 ′ is connected to a branch pipe 65 ⁇ branched from the middle of the recovery pipe 23 of the first liquid recovery mechanism 20. That is, in the example shown in FIG. 7, the sampling port of the measuring device 60 ′ is provided in the collection pipe 23.
- the measuring device 65 measures the liquid LQ in contact with the substrate ⁇ .
- the liquid LQ that has come into contact with the substrate! 3 may contain a photoresist provided on the substrate ⁇ or a substance eluted from a protective film called a top coat.
- the measuring device 65 can measure the properties and components of the liquid LQ containing these effluents.
- the control device CONT can store the measurement result of the measuring device 65 in the storage device MRY as log information associated with the passage of time or the shot area.
- the control device CONT can determine the amount of change in the eluted substances over time based on the log information. Then, when the amount of the fluctuation increases significantly with the passage of time, it can be determined that the photoresist is soluble in the liquid LQ. Further, the controller CONT can obtain the acidity of the recovered liquid LQ based on the measurement result (or log information) of the measuring device 60. Liquid LQ with high acidity Corrosion (mackerel) of the members that come into contact with the liquid LQ such as the recovery pipe 23 is caused. Therefore, the control device CONT reports the measurement result (log information) of the properties or components of the collected liquid LQ, for example, by using the notification device INF, and prompts the review (change) of the type of photoresist used. Action can be taken.
- the measuring device 65 measures the liquid LQ through the porous body 22P provided in the first recovery port 22, impurities attached to the porous body 22P and the collection pipe 23 ( Live bacteria) can also be measured.
- impurities adhered to the porous body 22P and the collection pipe 23 Live bacteria
- the control device CONT notifies the measurement result (log information) of the property or component of the collected liquid LQ by, for example, the notification device INF, and can perform a measure such as prompting replacement or cleaning of the porous body 22P. .
- the measuring device 60 may be provided on the substrate stage PST.
- the measuring device 60 ′′ includes a measuring device 66 embedded in the substrate stage PST and a sampling port (hole) 67 provided on the upper surface 51 of the substrate stage PST.
- the liquid immersion area AR2 of the liquid LQ is formed on the image plane side of the projection optical system PL, and the liquid immersion area AR2 and the substrate stage PST are moved relative to each other.
- the area AR2 is placed on the sampling port 67, and the liquid LQ flows into the sampling port 67.
- the measuring device 66 measures the liquid LQ obtained through the sampling port 67.
- the control device CONT can supply the functional liquid LK from the liquid supply mechanism 10 to each component that comes into contact with the liquid LQ forming the liquid immersion area AR2, and can clean those components. If the liquid LQ is contaminated rather than in a desired state, for example, if the liquid LQ contains a large amount of viable bacteria, each member that comes into contact with the liquid LQ, specifically, the first nozzle member 70 The liquid contact surface 70A of the second nozzle member 80, the liquid contact surface 80A of the second nozzle member 80, the supply channel 14 and the first recovery channel 24 which are the internal channels of the first nozzle member 70, and the internal channels of the second nozzle member 80.
- Upper surface 51 of substrate stage PST, measuring member 300 on substrate stage PST and optical measuring unit 400, 500, 600 etc. may be contaminated.
- the member is contaminated, even if a clean liquid LQ is supplied from the liquid supply unit 11, the liquid LQ is contaminated by contact with the member, and the immersion area AR2 is formed by the contaminated liquid LQ. Then, the exposure accuracy and the measurement accuracy via the liquid LQ deteriorate.
- the control device CONT supplies the functional liquid LK having a bactericidal action to a part of the liquid supply mechanism 10, for example, when the amount of viable bacteria is larger than an allowable value.
- the constituent members are cleaned by supplying the constituent members from the constituent functional liquid supply device (cleaning device) 120.
- the functional liquid supply device 120 supplies the functional liquid LK having a bactericidal action in order to remove viable bacteria on the member that comes into contact with the liquid.
- the functional liquid LK having a bactericidal action include a liquid containing hydrogen peroxide or ozone.
- the control device CONT drives a valve 19B provided in the supply pipe 19 connecting the functional liquid supply device 120 and the liquid supply unit 11, thereby opening the flow path of the supply pipe 19 and returning the same.
- the flow path of the pipe 18 is closed by the valve 18B.
- the functional liquid LK having a sterilizing action is supplied from the functional liquid supply device 120 to the liquid supply unit 11 (step SB1).
- the functional liquid LK supplied from the functional liquid supply unit 120 flows through the liquid supply unit 11 including the pure water production unit 16 and the temperature control unit 17, and then flows through the supply pipe 13, and the supply flow path of the first nozzle member 70.
- the functional liquid supply device 120 cleans the flow paths of the liquid LQ, which constitute the liquid supply mechanism 10, by supplying the functional liquid LK to the flow paths (the supply pipe 13, the supply flow path 14, and the like) through which the liquid LQ flows.
- the control device CONT issues a notification by the notification device INF to remove the ion exchange membrane before driving the valve 19B.
- the functional liquid supply device 120 supplies the functional liquid LK to the image plane side of the projection optical system PL
- a dummy substrate is held on the substrate stage PST (substrate holder PH).
- Dummy group The plate has approximately the same size and shape as the substrate P for device manufacture.
- the dummy substrate has liquid repellency to the functional liquid LK. Note that the dummy substrate does not have to have liquid repellency to the functional liquid LK.
- the functional liquid LK sent from the functional liquid supply device 120 is supplied from the supply port 12 onto the dummy substrate, and forms a liquid immersion area on the image plane side of the projection optical system PL.
- the functional liquid supply device 120 When the functional liquid supply device 120 is supplying the functional liquid LK, the first liquid recovery mechanism 20 and the second liquid recovery mechanism 30 perform the liquid recovery operation (suction operation) as in the liquid immersion exposure operation. I have. Therefore, the functional liquid LK in the liquid immersion area formed on the image plane side of the projection optical system PL is recovered through the first recovery port 22, flows through the first recovery channel 24 and the recovery pipe 23, and 1 Collected in the liquid recovery unit 21.
- the control device CONT increases the functional fluid supply amount per unit time from the functional fluid supply device 120, or reduces the functional fluid recovery amount per unit time by the first liquid recovery mechanism 20, for example.
- the liquid immersion area of the LK is enlarged, and the functional liquid LK in the liquid immersion area is recovered through the second recovery port 32 of the second liquid recovery mechanism 30.
- the functional liquid LK collected via the second recovery port 32 flows through the second recovery flow path 34 and the recovery pipe 33, and is then recovered by the second liquid recovery unit 31.
- the functional liquid LK collected through the first and second collection ports 22 and 32 is not collected by the first and second liquid collection sections 21 and 31 but is replaced by the first and second liquid collection sections 21 and 31.
- 31 may be collected in a separate collection unit.
- the recovered functional liquid LK may be returned to the liquid supply unit 11 again, or may be discarded. In this way, the liquid LQ is replaced with the functional liquid LK (Step SB2).
- the functional liquid LK in the liquid immersion area formed on the image plane side of the projection optical system PL also contacts the liquid contact surface 2A of the optical element 2 and the liquid contact surfaces 70A and 80A of the nozzle members 70 and 80. Therefore, the liquid contact surfaces 2A, 70A and 80A can be cleaned. Also, with the liquid immersion area of the functional liquid LK formed, the substrate stage PST is moved two-dimensionally in the XY direction with respect to the liquid immersion area, so that the upper surface 51 of the substrate stage PST and the substrate stage PST can be moved. The provided measuring member 300 and optical measuring units 400, 500, and 600 can be cleaned (step SB3).
- the operation of forming the immersion area of the functional liquid LK is performed in the same procedure as in the immersion exposure operation.
- the above members can be simultaneously and efficiently cleaned.
- the supply and recovery operations of the functional liquid LK are performed in the same procedure as in the immersion exposure operation.
- An immersion area of the functional liquid LK is formed on the image plane side of the projection optical system PL continuously for a long time.
- the functional liquid LK may flow through the flow paths of the liquid supply mechanism 10 and the first and second liquid recovery mechanisms 20 and 30.
- the supply and recovery operations of the functional liquid LK are stopped. In this state, the functional liquid LK is held on the image plane side of the projection optical system PL, and is in an immersion state.
- the control device CONT operates the valves 19B and 18B again to switch the piping path, and supplies the liquid LQ from the liquid supply unit 11 to the supply pipe 13 (step SB4). .
- the liquid supply mechanism 10 and the first and second liquid recovery mechanisms 20 and 30 supply and recover the liquid LQ (for example, pure water) for a predetermined period of time, and the immersion area of the liquid LQ is moved to the projection optical system PL. Formed on the image plane side.
- the liquid LQ flows through each flow path of the liquid supply mechanism 10, the first liquid recovery mechanism 20, and the second liquid recovery mechanism 30, and the function remaining in the flow path by the liquid LQ.
- the liquid LK is washed away (step SB5).
- liquid contact surface 2A of the optical element 2 and the liquid contact surfaces 70A and 80B of the first and second nozzle members 70 and 80 are also cleaned by the pure water immersion area.
- the substrate stage PST moves while the liquid immersion area of the liquid LQ is formed, so that the upper surface 51 of the substrate stage PST contacted with the functional liquid LK, the measuring member 300, and the optical measuring units 400, 500, and 600 The remaining functional liquid LK is also washed away with liquid LQ.
- the liquid LQ is measured using the measuring device 60 to determine whether the cleaning process has been performed well, that is, whether the liquid LQ is in a desired state. Confirmation power S can.
- the liquid LQ is prevented from flowing out of the substrate P (outside the upper surface 51) during the immersion exposure, and the liquid LQ can be smoothly recovered even after the immersion exposure, so that the liquid In order to prevent inconvenience in which LQ remains, upper surface 51 of substrate stage PST has liquid repellency.
- the upper surface 51 is formed of a liquid-repellent material such as polytetrafluoroethylene (Teflon (registered trademark)).
- Teflon registered trademark
- a fluorine-based resin material such as polytetrafluoroethylene, an acrylic resin material, a silicon-based resin material, or the like.
- the upper surface 51 may be made lyophobic by applying a lyophobic material such as a coating material or by applying a lyophobic treatment such as attaching a thin film of the lyophobic material strength.
- the optical element 2 is made of fluorite or quartz, and the liquid contact surface of the optical element 2
- the liquid contact surface 70A of the first nozzle member 70 (or the liquid contact surface 80A of the second nozzle member 80 in some cases) also has lyophilicity. Since the liquid contact surfaces have lyophilic property, the liquid can be satisfactorily held on the image surface side of the projection optical system PL to form a liquid immersion area.
- a lyophilic material such as MgF, Al ⁇ , or SiO is attached.
- the lyophilic treatment is performed by forming a thin film with a substance having a highly polar molecular structure such as alcohol, for example. Can also be given.
- the functional liquid L K is preferably made of a material that does not affect these liquid contact surfaces.
- the functional liquid LK is preferably made of a material that does not affect the upper surface 51 of the substrate stage PST or the liquid contact surfaces 2A, 70A, and 80A.
- the upper surface 51 of the substrate stage PST is made of a material that is not resistant to the functional liquid LK having a sterilizing action
- a dummy substrate covering the entire upper surface 51 of the substrate stage PST is used as a substrate.
- an immersion area for the functional liquid LK is formed on the image plane side of the projection optical system PL.
- the cleaning process is performed by controlling the operation of the liquid supply mechanism 10 including the functional liquid supply device 120 based on the measurement result of the measurement device 60. It is of course possible to adopt a configuration in which the cleaning process is performed at predetermined time intervals (for example, every month or every year) without depending on the measurement result of the measuring device 60.
- the cleaning process is performed at predetermined time intervals (for example, every month or every year) without depending on the measurement result of the measuring device 60.
- a contamination source that contaminates the above-mentioned members (the nozzle member 70 and the optical element 2 etc.) that come into contact with the liquid Q, not only the contaminated liquid LQ but also impurities floating in the air adhere to the members. Therefore, the member may be contaminated.
- a cleaning liquid having a bactericidal action is supplied as the functional liquid LK.
- the supply pipe is supplied by flowing hydrogen water as the functional liquid LK.
- Foreign matter adhering to members including the 13 and the recovery pipe 23 can be removed.
- the electrical conductivity of the components including the supply pipe 13 and the recovery pipe 23 can be controlled.
- Flowing a functional liquid (carbon dioxide water) that has the function of controlling electrical conductivity can prevent the generation of static electricity from members and remove static electricity from charged members. It is possible to prevent the occurrence of an exposure operation failure due to the occurrence and the electrostatic breakdown of the pattern due to discharge.
- the function liquid LK force S and the liquid for immersion exposure are used as a function liquid LK force S, which is performed separately from the process of flowing the functional solution LK (cleaning process) and the immersion exposure process.
- the immersion area AR2 for immersion exposure may be formed with the functional liquid LK. In this case, the cleaning process and the immersion exposure process are performed simultaneously.
- the functional liquid supply device 120 is configured to supply the functional liquid LK to the pure water production device 16.
- the functional liquid supply device 120 is connected to the pure water production device 16 and the temperature control device. It is also possible to provide a valve connected between the temperature controller 17 and the functional liquid LK so as to prevent the functional liquid LK from flowing back to the pure water production apparatus 16. According to this, it is not necessary to remove the ion exchange membrane of the pure water production device 16 when supplying the functional liquid LK.
- the liquid LQ in each of the above embodiments is made of pure water.
- Pure water has the advantage that it can be easily obtained in large quantities at semiconductor manufacturing plants and the like, and that it has no adverse effect on the photoresist on the substrate P, optical elements (lenses), and the like.
- pure water has no adverse effect on the environment and has very low impurity content, so that the surface of the substrate P and the surface of the optical element provided on the front end surface of the projection optical system PL are cleaned. Can also be expected.
- the exposure apparatus may have an ultrapure water production device.
- the refractive index n of pure water (water) with respect to the exposure light EL having a wavelength of about 193 nm is approximately 1.4.
- ArF excimer laser light wavelength 193 nm
- the wavelength is shortened to 1 / n on the substrate P, that is, about 134 nm, and high resolution is obtained.
- the depth of focus is expanded to about n times, that is, about 1.44 times as compared to that in the air, if it is sufficient to secure the same depth of focus as that used in the air, the projection optical system PL Can be further increased, and also in this respect, the resolution is improved.
- the numerical aperture NA of the projection optical system may be 0.9 to 1.3.
- the numerical aperture NA of the projection optical system is increased as described above, the polarization effect may deteriorate the imaging performance of the randomly polarized light conventionally used as the exposure light. Is desirable.
- linearly polarized illumination is performed in line with the longitudinal direction of the line pattern of the mask (retinator) line 'and' space pattern, and the S (polarized light) component (TE polarized component), It is preferable that a large amount of diffracted light of the polarization direction component along the longitudinal direction of the line pattern is emitted.
- the space between the projection optical system PL and the resist applied to the surface of the substrate P is filled with air (gas).
- the transmittance of diffracted light of S-polarized light component (TE-polarized light component), which contributes to the improvement of contrast, on the resist surface is higher than that of the case where the numerical aperture NA of the projection optical system exceeds 1.0. Even in such a case, high imaging performance can be obtained. Further, it is more effective to appropriately combine a phase shift mask, such as an oblique incidence illumination method (particularly a dipole illumination method) adapted to the longitudinal direction of the line pattern as disclosed in Japanese Patent Application Laid-Open No. 6-188169.
- the combination of the linearly polarized illumination method and the dipole illumination method is used when the periodic direction of the line-and-space pattern is limited to one predetermined direction, or when the hole pattern is dense along the predetermined one direction. It is effective when For example, when illuminating a halftone type phase shift mask with a transmittance of 6% (a pattern with a notch pitch of about 45 nm) by using both the linearly polarized illumination method and the dipole illumination method, the pupil plane of the illumination system should be placed on the pupil plane.
- the illumination ⁇ defined by the circumcircle of the two beams forming the dipole is 0.95
- the radius of each beam on the pupil plane is 0.125 ⁇
- the depth of focus (DOF) can be increased by about 150 nm as compared with using randomly polarized light.
- DOE depth of focus
- a fine line 'and' space pattern for example, a line 'and' of about 25 to 50 nm
- the mask M acts as a polarizing plate due to the wave guide effect, and lowers the contrast.
- More diffracted light of the S polarization component (TE polarization component) is emitted from the mask M than diffracted light of the polarization component (TM polarization component).
- TE polarization component More diffracted light of the S polarization component
- TM polarization component More diffracted light of the polarization component
- the P polarization component (TM polarization component) is changed to the S polarization component (TE polarization component) by the Wire Grid effect.
- TM polarization component the S polarization component
- TE polarization component the S polarization component
- Wire Grid effect For example, using an ArF excimer laser as the exposure light and using a projection optical system PL with a reduction ratio of about 1/4, a line 'and' space pattern larger than 25 nm is formed on the substrate P.
- the diffracted light of the S-polarized light component (TE-polarized light component) is emitted from the mask M more than the diffracted light of the P-polarized light component (TM-polarized light component).
- the number NA is 0.9 or larger as in 1.3, it is possible to obtain high resolution performance S.
- JP-A-6-53120 in which only linearly polarized light (S-polarized light) aligned with the longitudinal direction of the line pattern of the mask (reticle) is used, the optical axis is centered. It is also effective to use a combination of the polarized illumination method and the oblique incidence illumination method, in which the light is linearly polarized in the tangential (circumferential) direction of the circle.
- the pattern of the mask (reticle) extending only in a predetermined direction.
- a projection optical system can be obtained by using both a polarization illumination method that linearly polarizes light in a tangential direction of a circle centered on an optical axis and an annular illumination method.
- High imaging performance can be obtained even when the numerical aperture NA is large.
- a polarization illumination method and a ring illumination method (a ring zone) in which a halftone phase shift mask (a pattern with a half pitch of about 63 nm) having a transmittance of 6% is linearly polarized in the tangential direction of a circle centered on the optical axis.
- the depth of focus can be increased by about 250 nm compared to using randomly polarized light.
- the optical element (lens) 2 is attached to the tip of the projection optical system PL, and this lens allows the optical characteristics of the projection optical system PL, such as aberration (spherical aberration, coma, etc.). Can be adjusted.
- the optical path space on the exit side of the optical element 2 of the projection optical system PL is filled with the liquid LQ to expose the substrate P, but this is disclosed in WO 2004/019128.
- the optical path space on the incident side of the optical element 2 of the projection optical system PL may be filled with the liquid LQ.
- the items described in the above embodiment may be applied to the liquid LQ that fills the optical path space on the entrance side of the optical element 2.
- the properties or components of the liquid LQ supplied to the entrance side of the optical element 2 may be managed in the same manner as the liquid LQ supplied to the exit side.
- a difference is set in the property or the component management value of the liquid LQ between the entrance side and the exit side of the optical element 2, and each is separately controlled.
- the functional liquid LK can be introduced also on the incident side of the optical element 2 to perform cleaning and static elimination.
- the optical element attached to the tip of the projection optical system PL may be an optical plate used for adjusting the optical characteristics of the projection optical system PL.
- a parallel plane plate that can transmit the exposure light EL may be used.
- the optical element When the pressure between the optical element at the tip of the projection optical system PL and the substrate P generated by the flow of the liquid LQ is large, the optical element is not replaced by the pressure, but the optical element is not replaced.
- the element may be firmly fixed so that it is not powered.
- the space between the projection optical system PL and the surface of the substrate P is configured to be filled with the liquid LQ.
- a configuration in which the liquid LQ is filled in the attached state may be employed.
- the liquid LQ of the present embodiment may be a force S that is water or a liquid other than water.
- the light source of the exposure light EL is an F laser
- liquid LQ for example, perfluoropolyether (PFPE) or It may be a fluorine-based fluid such as a fluorine-based oil.
- PFPE perfluoropolyether
- the portion that comes into contact with the liquid LQ is subjected to lyophilic treatment by forming a thin film of a substance having a small molecular structure, for example, containing fluorine.
- other liquid LQs that are transparent to the exposure optical system EL and have a refractive index as high as possible and are stable to the photo resist coated on the surface of the substrate P (for example, Cedar) Oil) can also be used.
- the surface treatment is performed according to the polarity of the liquid LQ used.
- the substrate P in each of the above embodiments is not limited to a semiconductor wafer for manufacturing a semiconductor device, but may be a glass substrate for a display device, a ceramic wafer for a thin-film magnetic head, or a mask or a mask used in an exposure apparatus.
- a reticle master synthetic quartz, silicon wafer, etc. is applied.
- the exposure apparatus EX includes a step of scanning and exposing the pattern of the mask M by synchronously moving the mask M and the substrate P.
- the present invention can also be applied to a step-and-repeat type projection exposure apparatus (stepper) in which the pattern of the mask M is exposed collectively while the mask M and the substrate P are stationary and the substrate P is sequentially moved in steps.
- a reduced image of the first pattern is projected onto a projection optical system (for example, a refraction not including a reflective element at 1/8 reduction magnification) while the first pattern and the substrate P are almost stationary.
- the present invention can also be applied to an exposure apparatus of a type that performs simultaneous exposure on a substrate P using a mold projection optical system). In this case, after that, while the second pattern and the substrate P are almost stationary, the reduced image of the second pattern is partially exposed on the substrate P at one time using the projection optical system so as to partially overlap the first pattern.
- the present invention can also be applied to a stitch type batch exposure apparatus.
- the stitch type exposure apparatus can be applied to a step-and-stitch type exposure apparatus in which at least two patterns are partially overlapped and transferred on the substrate P, and the substrate P is sequentially moved.
- the present invention relates to JP-A-10-163099, JP-A-10-214783, and
- the present invention can also be applied to a twin-stage type exposure apparatus disclosed in, for example, 2000-505958.
- the exposure device that locally fills the liquid between the projection optical system PL and the substrate P is adopted.
- the present invention is disclosed in Japanese Patent Application Laid-Open No. 6-124873. Disclosure It is also applicable to a liquid immersion exposure apparatus that moves a stage holding a substrate to be exposed as described above in a liquid tank.
- the type of the exposure apparatus EX is not limited to an exposure apparatus for manufacturing a semiconductor element for exposing a semiconductor element pattern onto a substrate P, but may be an exposure apparatus for manufacturing a liquid crystal display element or a display, a thin film magnetic head, or the like. It can be widely applied to an exposure device for manufacturing an image pickup device (CCD), a reticle or a mask, and the like.
- CCD image pickup device
- each stage PST and MST can be of the type that moves along the guide or the guideless type that does not have a guide.
- the drive mechanism for each stage PST, MST is such that a magnet unit, in which magnets are arranged in two dimensions, and an armature unit, in which coils are arranged in two dimensions, face each other, and each stage PST, MST is driven by electromagnetic force.
- a flat motor may be used.
- one of the magnet unit and the armature unit may be connected to the stages PST and MST, and the other of the magnet unit and the armature unit may be provided on the moving surface side of the stages PST and MST.
- the exposure apparatus EX of the present embodiment assembles various subsystems including the respective constituent elements recited in the claims of the present application so as to maintain predetermined mechanical accuracy, electrical accuracy, and optical accuracy. It is manufactured by. Before and after this assembly, adjustments to achieve optical accuracy for various optical systems, adjustments to achieve mechanical accuracy for various mechanical systems, Adjustments are made to achieve electrical accuracy for various electrical systems.
- the process of assembling the exposure apparatus from various subsystems includes mechanical connections, wiring connections of electric circuits, and piping connections of pneumatic circuits among the various subsystems. It goes without saying that there is an assembling process for each subsystem before the assembling process from these various subsystems to the exposure apparatus. When the process of assembling the various subsystems into the exposure apparatus is completed, comprehensive adjustment is performed, and various precisions of the entire exposure apparatus are secured. It is desirable to manufacture the exposure apparatus in a clean room in which the temperature, cleanliness, etc. are controlled.
- a micro device such as a semiconductor device has a function device performance design step 201, a mask (reticle) manufacturing step 202 based on this design step, and a device substrate.
- Step 203 of manufacturing a certain substrate substrate processing step 204 of exposing a mask pattern to the substrate by the exposure apparatus EX of the above-described embodiment, device assembly step (including dicing step, bonding step, package step) 205, inspection step Manufactured through 206 etc.
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Abstract
Description
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Priority Applications (18)
Application Number | Priority Date | Filing Date | Title |
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EP05749073.2A EP1783821B1 (en) | 2004-06-09 | 2005-06-07 | Exposure system and device production method |
KR1020127003719A KR101512884B1 (ko) | 2004-06-09 | 2005-06-07 | 노광 장치 및 디바이스 제조 방법 |
US11/570,219 US8520184B2 (en) | 2004-06-09 | 2005-06-07 | Immersion exposure apparatus and device manufacturing method with measuring device |
KR1020177003247A KR20170016532A (ko) | 2004-06-09 | 2005-06-07 | 노광 장치 및 디바이스 제조 방법 |
KR1020147025197A KR101561796B1 (ko) | 2004-06-09 | 2005-06-07 | 노광 장치 및 디바이스 제조 방법 |
KR1020157010305A KR101747662B1 (ko) | 2004-06-09 | 2005-06-07 | 노광 장치 및 디바이스 제조 방법 |
CN2005800183590A CN101095213B (zh) | 2004-06-09 | 2005-06-07 | 曝光装置及元件制造方法 |
KR1020137023317A KR101440746B1 (ko) | 2004-06-09 | 2005-06-07 | 노광 장치 및 디바이스 제조 방법 |
KR1020077000539A KR101162128B1 (ko) | 2004-06-09 | 2005-06-07 | 노광 장치 및 디바이스 제조 방법 |
KR1020127025606A KR101433496B1 (ko) | 2004-06-09 | 2005-06-07 | 노광 장치 및 디바이스 제조 방법 |
KR1020137023316A KR101421915B1 (ko) | 2004-06-09 | 2005-06-07 | 노광 장치 및 디바이스 제조 방법 |
JP2006514514A JP4760708B2 (ja) | 2004-06-09 | 2005-06-07 | 露光装置、露光方法、及びデバイス製造方法、メンテナンス方法 |
KR1020127000370A KR101422964B1 (ko) | 2004-06-09 | 2005-06-07 | 노광 장치 및 디바이스 제조 방법 |
US11/767,441 US8525971B2 (en) | 2004-06-09 | 2007-06-22 | Lithographic apparatus with cleaning of substrate table |
HK07109175.1A HK1101294A1 (en) | 2004-06-09 | 2007-08-23 | Exposure system and device production method |
US12/134,950 US8704997B2 (en) | 2004-06-09 | 2008-06-06 | Immersion lithographic apparatus and method for rinsing immersion space before exposure |
US13/950,338 US9645505B2 (en) | 2004-06-09 | 2013-07-25 | Immersion exposure apparatus and device manufacturing method with measuring device to measure specific resistance of liquid |
US15/585,664 US20170235238A1 (en) | 2004-06-09 | 2017-05-03 | Immersion exposure apparatus and device manufacturing method with measuring device |
Applications Claiming Priority (2)
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JP2004171115 | 2004-06-09 | ||
JP2004-171115 | 2004-06-09 |
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US11/570,219 A-371-Of-International US8520184B2 (en) | 2004-06-09 | 2005-06-07 | Immersion exposure apparatus and device manufacturing method with measuring device |
US11/767,441 Division US8525971B2 (en) | 2004-06-09 | 2007-06-22 | Lithographic apparatus with cleaning of substrate table |
US12/134,950 Division US8704997B2 (en) | 2004-06-09 | 2008-06-06 | Immersion lithographic apparatus and method for rinsing immersion space before exposure |
US13/950,338 Division US9645505B2 (en) | 2004-06-09 | 2013-07-25 | Immersion exposure apparatus and device manufacturing method with measuring device to measure specific resistance of liquid |
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EP (3) | EP1783821B1 (ja) |
JP (12) | JP4760708B2 (ja) |
KR (9) | KR101512884B1 (ja) |
CN (8) | CN101776850B (ja) |
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WO (1) | WO2005122218A1 (ja) |
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