WO2006115186A1 - 露光方法及び露光装置、並びにデバイス製造方法 - Google Patents
露光方法及び露光装置、並びにデバイス製造方法 Download PDFInfo
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- WO2006115186A1 WO2006115186A1 PCT/JP2006/308385 JP2006308385W WO2006115186A1 WO 2006115186 A1 WO2006115186 A1 WO 2006115186A1 JP 2006308385 W JP2006308385 W JP 2006308385W WO 2006115186 A1 WO2006115186 A1 WO 2006115186A1
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- liquid
- exposure apparatus
- exposure
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- wafer
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Classifications
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- 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
- G03F7/70483—Information management; Active and passive control; Testing; Wafer monitoring, e.g. pattern monitoring
- G03F7/70605—Workpiece metrology
- G03F7/70608—Monitoring the unpatterned workpiece, e.g. measuring thickness, reflectivity or effects of immersion liquid on resist
-
- 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
-
- 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
- G03F7/70341—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
- 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
-
- 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
- G03F7/7095—Materials, e.g. materials for housing, stage or other support having particular properties, e.g. weight, strength, conductivity, thermal expansion coefficient
-
- 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
Definitions
- Exposure method Exposure method, exposure apparatus, and device manufacturing method
- the present invention relates to an exposure method, an exposure apparatus, and a device manufacturing method, and more specifically, an exposure method and an exposure apparatus that expose an object through a liquid, and the exposure method and the exposure apparatus in a lithographic process.
- the present invention relates to a device manufacturing method to be used.
- a mask (or reticle) pattern image is transferred to a resist (sensitive material) via a projection optical system.
- a projection optical system Transferred to each of a plurality of shot areas on a sensitive object such as a wafer or glass plate (hereinafter collectively referred to as “wafer”), and a reduction projection exposure apparatus (,
- stepper” and step “and” scan type projection exposure apparatuses also called “so-called scanning” steppers (also called scanners) are mainly used.
- the exposure apparatus described in Patent Document 1 utilizes the fact that the wavelength power of exposure light in liquid is lZn times that in air (where n is the refractive index of the liquid, which is usually about 1.2 to 1.6).
- n is the refractive index of the liquid, which is usually about 1.2 to 1.6.
- the depth of focus is increased by n times compared to a projection optical system that can achieve the same resolution as that without using the immersion method (assuming that such a projection optical system can be manufactured).
- the depth of focus can be substantially increased n times compared to the air.
- a film (resist film and Z or top coat layer) on the object (weno) is formed. May be charged. In that case, the film (resist film and Z or topcoat layer) on the object (Weno) may be damaged or modified, which may cause defects.
- Patent Document 1 Pamphlet of International Publication No. 99Z49504
- the present invention has been made under the circumstances described above, and also has the first viewpoint power, and is an exposure method for exposing an object through a liquid, which is a predetermined method for adjusting the specific resistance of the liquid to the liquid.
- the specific resistance of the liquid is reduced by dissolution of a predetermined substance, and the specific resistance is reduced.
- An immersion region can be formed on the film formed on the object by the lowered liquid. For this reason, charging of the liquid is prevented or effectively suppressed, and the occurrence of dielectric breakdown of the film on the object on which the liquid immersion area is formed is effectively suppressed. Therefore, the pattern is formed on the object with high accuracy over a long period of time by irradiating the exposure light on the object through the liquid in which charging is prevented or effectively suppressed and exposing the object to form a predetermined pattern. can do.
- an exposure apparatus forms a predetermined pattern on an object by irradiating the object with an exposure beam through the optical member and the liquid and exposing the object.
- the liquid supplied on the liquid film has a mixing mechanism for mixing and dissolving a predetermined substance for adjusting the specific resistance of the liquid, and the liquid in which the predetermined substance is dissolved is supplied onto the liquid repellent film.
- a liquid immersion device for forming a liquid immersion region.
- the liquid immersion device mixes a predetermined substance that adjusts the specific resistance of the liquid into the liquid supplied on the liquid repellent film on the surface of the member disposed on the light emission side of the optical member.
- a liquid-dissolving region is formed by supplying a liquid in which the predetermined substance is dissolved onto the liquid-repellent film. Therefore, the specific resistance of the liquid can be reduced, the charging of the liquid is prevented or effectively suppressed, and the occurrence of dielectric breakdown of the liquid repellent film in which the liquid immersion area is formed is effectively suppressed. Therefore, it is possible to perform highly accurate measurement over a long period of time with a sensor, and by applying the exposure beam to the object through the liquid reflecting the measurement result, exposure is performed with high accuracy. Can be performed over a long period of time.
- an exposure apparatus that forms a predetermined pattern on an object by irradiating the object with an exposure beam through a liquid to expose the object.
- a liquid immersion apparatus that has a mixing mechanism for dissolving the liquid and supplies the liquid on which the predetermined substance has been dissolved onto the film to form a liquid immersion area.
- the liquid immersion device is formed on the object placed on the object stage.
- An immersion area is formed.
- a liquid immersion region is formed on the film formed on the object with the liquid having a reduced specific resistance.
- charging of the liquid is prevented or effectively suppressed, and the occurrence of dielectric breakdown of the film member on the object on which the liquid immersion area is formed is effectively suppressed. Therefore, a pattern can be accurately formed on an object by irradiating an exposure beam on the object through the liquid in which charging is prevented or effectively suppressed and exposing the object to form a predetermined pattern. it can.
- the present invention is a device manufacturing method including a lithographic process in which a device pattern is formed on the object by exposing the object using the exposure method of the present invention. I can say that. Further, in the lithographic process, the pattern can be accurately formed on the object by using one of the first and second exposure apparatuses of the present invention. Therefore, from the fifth aspect, the present invention is a device manufacturing method including a lithographic process for forming a device pattern on an object using either the first or second exposure apparatus of the present invention. I can say that.
- a device including a lithographic process for exposing an object through a liquid and forming a device pattern on the object in an exposure apparatus connected to the substrate processing apparatus.
- a manufacturing method wherein an object before being carried into the exposure apparatus is soaked with a conductive liquid to remove electric charges charged on the object. .
- FIG. 1 is a drawing schematically showing a configuration of an exposure apparatus according to an embodiment.
- FIG. 2 is a plan view of the stage apparatus of FIG.
- FIG. 3 is a diagram schematically showing a configuration of a liquid supply apparatus.
- FIG. 4 is a plan view showing a measurement table.
- FIG. 5 is a longitudinal sectional view of a measurement table showing the vicinity of an illuminance monitor 122.
- FIG. 6 is a block diagram showing a main configuration of a control system of the exposure apparatus of the embodiment.
- FIG. 1 schematically shows a configuration of an exposure apparatus 100 according to an embodiment.
- the exposure apparatus 100 is a step-and-scan type scanning exposure apparatus, that is, a so-called scanner.
- Exposure apparatus 100 holds illumination system ILS and reticle R as a mask illuminated by exposure illumination light IL as an energy beam from illumination system ILS and holds a predetermined scanning direction (here, FIG. 1).
- Projection stage PU including a projection optical system PL and wafer that project illumination light IL emitted from the reticle stage RST and reticle R onto the wafer W.
- Illumination system As an example of a light source installed in ILS, the wavelength is 200 ⁇ ! ArF excimer laser light source (output wavelength 193nm), which is a pulsed light source that emits light in the vacuum ultraviolet region of ⁇ 170nm, is used.
- the illumination system ILS includes a beam shaping optical system, an energy coarse adjuster, an optical integrator (unifomizer or homogenizer), an illumination system, an aperture stop plate, a beam splitter, and a relay lens arranged in a predetermined positional relationship. , A reticle blind, a mirror for folding the optical path, and a condenser lens (both not shown).
- the configuration of the illumination system ILS and the function of each optical member are disclosed in, for example, International Publication No. 2002Z103766 pamphlet.
- Reticle stage RST On reticle stage RST, reticle R on which a circuit pattern or the like is formed on its pattern surface (lower surface in FIG. 1) is fixed, for example, by vacuum suction.
- Reticle stage RST can be driven minutely in the XY plane by a reticle stage drive system 55 including a linear motor, for example, and in a predetermined scanning direction (here, in the left-right direction in FIG. 1).
- reticle interferometer reticle laser interferometer
- moving mirror 65 actually Y (For example, 0.5 to Lnm is always detected with a resolution of about 0.5 nm through a Y moving mirror having a reflecting surface orthogonal to the axial direction and an X moving mirror having a reflecting surface orthogonal to the X axial direction). Is done.
- the measurement value of the reticle interferometer 53 is sent to the main control device 50, and the main control device 50 determines the reticle stage via the reticle stage drive system 55 based on the measurement value of the reticle interferometer 53! Controls the position (and speed) of the RST in the X-axis direction, Y-axis direction, and ⁇ z-direction (rotation direction around the Z-axis).
- RAa and RAb are set a predetermined distance apart in the X-axis direction.
- These reticle alignment detection systems RAa and RAb have the same configuration as that disclosed in, for example, JP-A-7-176468 and US Pat. No. 5,646,413 corresponding thereto. Is used.
- national legislation in the designated country (or selected selected country) designated in this international application, the disclosure in the above-mentioned gazette and the United States patent will be incorporated as a part of this description.
- Projection unit PU is arranged below reticle stage RST in FIG.
- the projection unit PU includes a lens barrel 140 and a projection optical system PL composed of a plurality of optical elements held in the lens barrel 140 in a predetermined positional relationship.
- the projection optical system PL for example, a refractive optical system having a plurality of lens (lens element) forces having a common optical axis AX in the Z-axis direction is used.
- the projection optical system PL is, for example, both-side telecentric and has a predetermined projection magnification (for example, 1Z4 times, 1Z5 times, or 1Z8 times).
- the illumination area IAR on the reticle R is illuminated by the illumination light IL from the illumination optical system 12, the illumination light IL that has passed through the reticle R passes through the projection optical system PL (projection unit PU).
- Reduced image of reticle R circuit pattern in illumination area IAR (reduced image of part of circuit pattern) Is formed in a region IA (hereinafter also referred to as an “exposure region”) IA that is conjugated to the illumination region IAR on the wafer W having a resist (sensitive material) coated on the surface thereof.
- the last optical element 191 on the most image plane side (wafer side) constituting the projection optical system PL is a lens having refractive power, but it is a parallel flat plate having no refractive power. Also good.
- a specific plurality of lenses is controlled by the imaging characteristic correction controller 52 based on a command from the main control device 50, and the projection optical system PL optical characteristics (including imaging characteristics), such as magnification, distortion, coma, and field curvature (including field tilt) can be adjusted.
- the aperture on the reticle side becomes larger as the numerical aperture NA substantially increases. For this reason, in a refractive optical system composed of only lenses, it becomes difficult to satisfy Petzval's conditions, and the projection optical system tends to be enlarged.
- a catadioptric system including a mirror and a lens may be used in order to avoid a large projection optical system.
- a lens (hereinafter also referred to as “front-end lens”) that is the last optical element on the image plane side (ueno, W side) constituting projection optical system PL 191
- a liquid supply nozzle 131A and a liquid recovery nozzle 131B that constitute a part of the liquid immersion device 132 are provided.
- One end of the liquid supply nozzle 131A is connected to a part of a liquid supply device 138 (not shown in FIG. 1, see FIG. 6) (not shown in FIGS. 1 and 6). 3 is connected to the other end of the recovery pipe (not shown in FIG. 1; see FIG. 6).
- One end of the liquid recovery nozzle 131B is connected to the liquid recovery device 139 (not shown in FIG. 1, see FIG. 6). Is connected.
- the immersion liquid Lq (see FIG. 1) is made using pure water that transmits ArF excimer laser light (light having a wavelength of 193 nm). Pure water has the advantage that it can be easily obtained in large quantities at semiconductor manufacturing plants and the like, and has less adverse effects on the resist and optical lenses on the wafer W.
- FIG. 3 shows an example of the configuration of the liquid supply device 138.
- the liquid supply device 138 has one end connected to a factory pipe of pure water in a semiconductor manufacturing factory, A pure water supply pipe 84 connected to one end of a CO dissolution tank 82 whose other end also serves as a liquid tank,
- Solenoid valve 86A for flow control provided in the middle of the pure water supply pipe 84, the above-mentioned CO dissolution tank 82
- CO supply pipe 88 that connects one end to a CO tank (not shown), in the middle of the CO supply pipe 88
- Supply pipe 90 with one end connected to the opposite side), one end connected to the other end of the supply pipe 90, a liquid temperature adjusting mechanism 72 for adjusting the liquid temperature, and installed in the middle of the supply pipe 90
- the pressure pump 74 and the resistivity meter 76 one end connected to the other end of the liquid temperature adjusting mechanism 72, the supply pipe 78 provided with the liquid supply nozzle 131A at the other end, and the liquid temperature adjusting mechanism 72, a controller 80 to which a solenoid valve 86A, 86B for flow control, a pressure pump 74, a resistivity meter 76, etc. are connected.
- the controller 80 operates the pressurizing pump 74 based on an instruction from the main controller 50, and during the operation, the liquid (diacid) from the CO dissolution tank 82 measured by the resistivity meter 76 is operated.
- the flow control solenoid valves 86A and 86B are controlled so that the measured specific resistance value is within a predetermined range while monitoring the specific resistance value of pure water in which carbonized carbon is dissolved.
- the CO tank tank supplies the pure water supplied through the factory piping inside the CO dissolution tank 82.
- Carbon dioxide (CO 2) is mixed and dissolved, and a liquid with a desired specific resistance value (pure water, strictly
- Lq is generated. That is, in this embodiment, carbon dioxide that lowers the specific resistance is mixed in pure water and dissolved, and supplied as liquid Lq on the measurement table MTB or wafer table WTB via the liquid supply nozzle 131A. To do.
- carbon dioxide (carbon dioxide) is mixed (dissolved) in pure water by directly injecting carbon dioxide into pure water, or mixed with carbon dioxide in pure water via a hollow fiber membrane.
- Various methods can be employed, such as Air containing carbon dioxide and carbon dioxide may be dissolved in pure water.
- the liquid temperature adjustment mechanism 72 controls the temperature of the liquid Lq under the instruction of the controller 80, and the exposure apparatus main body is stored. The temperature is adjusted to the same level as the temperature in the chamber (not shown).
- the controller 80 controls the liquid supply nozzle 13 1 A by adjusting the opening degree of the electromagnetic valves 86A and 86B for flow control while maintaining the flow ratio of pure water and carbon dioxide. Adjust the flow rate of liquid Lq supplied through
- the liquid temperature adjustment mechanism 72 Of course, a flow rate control valve may be provided at or near the unit to adjust the temperature and flow rate of the liquid.
- the liquid recovery apparatus 139 includes a liquid tank and a suction pump, and a valve for controlling recovery / stop of the liquid via a recovery pipe.
- a valve for controlling recovery / stop of the liquid via a recovery pipe.
- the refractive index n of pure water with respect to ArF excimer laser light is approximately 1.44.
- pure water and a refractive index depending on the ratio of the mixed diacid-carbon Since the mixing ratio of carbon dioxide is small, the refractive index of the liquid Lq for ArF excimer laser light should not be very different from the above value.
- the liquid immersion device 132 including the liquid supply nozzle 131A and the liquid recovery nozzle 131B is controlled by the main controller 50 (see FIG. 6).
- the main controller 50 supplies the liquid Lq between the tip lens 191 and the wafer W via the liquid supply nozzle 1 31 A, and the force between the tip lens 191 and the wafer W via the liquid collection nozzle 131B. Collect liquid Lq.
- main controller 50 determines the amount of liquid Lq to which liquid supply nozzle 131A is also supplied between tip lens 191 and wafer W, and the amount of liquid Lq to be recovered through liquid recovery nozzle 131B. It is controlled to always be equal. Therefore, a certain amount of liquid Lq (see FIG. 1) is held between the front lens 191 and the wafer W. In this case, the liquid Lq held between the tip lens 191 and the wafer W is constantly changing.
- the liquid Lq can be filled between the measurement table MTB and the tip lens 191 in the same manner as described above.
- liquid immersion device 132 may employ a configuration disclosed in European Patent Application Publication No. 1,598,855 or International Publication No. 2004Z090634.
- the optical member at the bottom end of the projection optical system PL As long as liquid can be supplied between the tip lens 191 and the wafer W, the liquid immersion device 132 may have any configuration.
- an off-axis alignment system (hereinafter referred to as an alignment system) that optically detects detection target marks such as alignment marks on Ueno and W.
- ALG is established.
- the alignment system ALG can use various types of sensors.
- an image processing type sensor is used.
- An image processing type sensor is disclosed in, for example, Japanese Patent Laid-Open No. 4-65603 and US Pat. No. 5,493,403 corresponding thereto.
- the imaging signal from the alignment system ALG is supplied to the main controller 50 (see FIG. 6).
- the stage device 150 includes a base board 112, a wafer stage WST and a measurement stage MST arranged above the upper surface of the base board 112, and these stages.
- An interferometer system 118 (see Fig. 6) for measuring the positions of WST and MST and a stage drive system 124 (see Fig. 6) for driving the stages WST and MST using a linear motor or the like are provided.
- non-contact bearings for example, aerostatic bearings (that is, air bearings (also called air pads)) are provided at a plurality of locations. Due to the static pressure of the pressurized air blown toward the upper surface of the base board 112, the air stage WST and the measurement stage MST float above the upper surface of the base board 112 through a clearance of several meters. It is supported. Each of the stages WST and MST is driven independently of each other (including ⁇ z rotation) in the XY plane by the stage drive system 124.
- the position of the Ueno, stage WST, and measurement stage MST in the stage moving surface (XY plane) and the rotational position around each coordinate axis are detected by the interferometer system 118.
- a Y-axis interferometer 116 for measuring the position of wafer stage WST in the Y-axis direction and a measurement stage for measuring the position of MST in the Y-axis direction are shown. Only Y-axis interferometer 117 is shown Yes.
- the measurement value of the interferometer system 118 (116, 117) is sent to the main control device 50.
- the main control device 50 based on the measurement value of the interferometer system 118, is connected to the Ueno via the stage drive system 124. Controls the position (and speed) of stage WST and measurement stage MST.
- the wafer stage WST has a wafer stage main body 91 in which the air bearing is provided on the bottom surface, and the wafer stage main body 91 is not shown on the wafer stage 91. It is mounted via the Z leveling mechanism (including an actuator such as a voice coil motor), and is rotated relative to the wafer stage main body 91 in the Z axis direction, the X axis rotation direction ( ⁇ X direction), and Y It is equipped with a wafer table WTB that is micro-driven in the rotational direction around the axis ( ⁇ y direction)!
- the Z leveling mechanism including an actuator such as a voice coil motor
- a wafer holder (not shown) that holds the wafer W by vacuum suction or the like is provided on the wafer table WTB.
- This wafer holder has a plate-like main body portion and a plate 93 (FIG. 1, FIG. 1), which is fixed to the upper surface of the main body portion and has a circular opening having a diameter of about 0.1 to 2 mm larger than the diameter of the wafer W at the center. (See Fig. 2)
- a large number of pins are arranged in the region of the main body portion inside the circular opening of the plate 93, and the wafer W is supported by the plurality of pins and is vacuum-sucked.
- a liquid repellent material such as a fluorine-based resin material or an acrylic resin material to form a liquid-repellent film.
- a resist (sensitive material) is applied to the surface of the wafer W, and a resist film is formed by the applied resist.
- a resist film that is liquid repellent with respect to the liquid Lq for immersion.
- a top coat film (layer) may be formed on the surface of the wafer W so as to cover the resist film.
- the topcoat film has a protective function that protects the resist film from the liquid Lq, an elution preventive function that prevents the substances constituting the resist film from eluting into the liquid Lq, and an antireflective function that prevents the reflection of the illumination light IL. Have at least one.
- the measurement stage MST includes a measurement stage main body 92 in which the air bearing is provided on the bottom surface, and a saddle leveling mechanism (not shown) on the measurement stage main body 92. And a measurement table ⁇ mounted on it.
- the measurement table MTB includes a hollow rectangular parallelepiped housing 120 (see FIG. 5) whose top surface is open, and polytetrafluoroethylene (Teflon (registered trademark)) that closes the top surface of the housing 120, for example.
- a plate member 101 having a predetermined thickness formed of a material having liquid repellency, and has a rectangular parallelepiped appearance in which the dimension in the height direction is significantly smaller than the dimension in the width direction and the depth direction.
- the plate member 101 has a rectangular opening 101a having a longitudinal direction in the Y-axis direction and substantially the same X-axis dimension as the opening 101a.
- a rectangular opening 101b having a longitudinal direction in the X-axis direction and three circular openings 101d, 101e, and 101f are formed.
- an illuminance monitor (irradiation dose monitor) 122 is arranged inside the opening 101b of the plate member 101 and inside the housing 120 below the opening 101b.
- the illuminance monitor 122 includes a glass member 126 made of synthetic quartz or fluorite and having a glass power, and an optical sensor 128 fixed to the lower surface of the glass member 126 with almost no gap. I have.
- the optical sensor 128 has a light receiving surface with a predetermined area that can receive almost all of the illumination light IL irradiated to the exposure area IA (see FIG. 4) shown in FIG. 5, and has the same wavelength as the illumination light IL.
- the glass member 126 has a shape that faces the inner side surface and the lower side surface of the opening 101b portion of the plate member 101 via a predetermined gap.
- the width dimension of the gap B between the opening 101b and the upper side surface of the glass member 126 is set to about 0.3 mm, for example.
- the glass member 126 is engaged from above with a support member 130 provided on the upper surface of the bottom wall of the housing 120. That is, the support member 130 has a frame shape with a predetermined width in plan view (viewed from above) surrounding the optical sensor 128, and the support member 130 has an outer edge on the lower surface of the glass member 126. A stepped portion that engages with the upper end is formed.
- a light reducing film 129 made of a metal thin film such as chromium that reduces the illumination light IL is formed over the entire surface.
- a liquid repellent material (water repellent material) such as a material is coated to form a liquid repellent film WRF.
- the upper surface of the liquid repellent HWRF and the upper surface of the plate member 101 are set to be substantially the same surface (the same surface).
- a light shielding film 127 made of a metal film such as chromium is formed on the lower surface of the glass member 126 in a region excluding the rectangular region at the center. As shown in FIG. 5, the light shielding film 127 cuts out (shields) stray light (see the solid line arrow in FIG. 5) incident on the glass member 126 via the gap B portion.
- the illuminance monitor 122 of the present embodiment is an illuminance monitor (irradiation dose monitor) disclosed in, for example, Japanese Patent Laid-Open No. 6-291016 and US Pat. No. 5,721,608 corresponding thereto. ) And measures the illuminance of the illumination light IL via the liquid Lq on the image plane of the projection optical system PL.
- the detection signal (photoelectric conversion signal) of the optical sensor 128 that constitutes part of the illuminance monitor 122 is sent via a hold circuit (not shown) (for example, a peak hold circuit) and analog Z digital (A / D) conversion. Supplied to the main controller 50.
- a hold circuit not shown
- a / D analog Z digital
- liquid repellent treatment can be performed by applying a liquid repellent material such as the above-described fluorine-based resin material or acrylic resin material.
- a discharge hole 120a is formed in the vicinity of the support member 130 on the bottom wall of the casing 120, and the discharge hole 120a is connected to a collection unit (not shown) via a pipe (not shown). It is connected.
- This recovery unit is equipped with a gas-liquid separator including a vacuum system and a tank capable of storing liquid Lq. Despite the liquid repellent treatment described above, the liquid Lq that has flowed into the housing 120 via the gap B is recovered by the recovery unit.
- a reference mark plate FM having a rectangular shape in plan view is disposed as shown in FIG.
- a gap A force of, for example, about 0.3 mm is formed between the reference mark plate FM and the plate member 101 around the reference mark plate FM.
- the upper surface of the fiducial mark plate FM is almost the same height as the surface of the plate member 101 ( Is set to the same level).
- three pairs of the first reference marks RM to RM that can be measured simultaneously by the pair of reticle alignment detection systems RAa and RAb and the alignment system ALG are detected.
- the reference mark plate FM is formed by patterning in the above-mentioned predetermined positional relationship on a chromium layer formed almost entirely on the surface of a member (for example, ultra-low expansion glass ceramic such as Talia Serum (registered trademark)).
- the opening pattern is formed.
- Each reference mark may be formed by a pattern of aluminum or the like (remaining pattern).
- the first reference mark RM as disclosed in, for example, Japanese Patent Application Laid-Open No. 5-21314 and US Pat. No. 5,243,195 corresponding thereto,
- the second reference mark WM can be measured by alignment ALG without liquid Lq.
- the arrangement of the reference marks is determined so that To the extent permitted by national legislation in the designated country (or selected selected country) designated in this international application, the disclosure in the above-mentioned gazette and the United States patent will be incorporated as a part of this description.
- the upper surface of the fiducial mark plate FM is almost flat and may be used as a reference surface for the multipoint focal position detection system.
- a liquid repellent film made of a liquid repellent material such as the above-mentioned fluorine-based resin material or acrylic-based resin material is provided above the chromium layer. It is formed.
- At least the region facing the plate member 101 on the side surface of the reference mark plate FM and the inner wall surface of the opening 101a facing the reference mark plate FM of the plate member 101 are subjected to the same liquid repellent treatment as described above. Yes. Further, a discharge hole similar to the discharge hole 120a is also formed in the vicinity of the reference mark plate FM on the bottom wall of the casing 120, and this discharge hole is connected to the vacuum system of the recovery unit.
- An uneven illuminance measuring instrument 104 having a circular pattern plate 103 in plan view is arranged inside the opening 101d of the plate member 101 and inside the casing 120 below the opening 101b. . Between the pattern plate 103 and the plate member 101, for example, a gap D force having a width of about 0.3 mm is formed around the pattern plate 103.
- the illuminance unevenness measuring instrument 104 is a sensor that also includes the pattern plate 103 and a light receiving element (not shown) (such as the above-described silicon 'photo' diode or photomultiplier 'tube) disposed below the pattern plate. And have.
- the pattern plate 103 is made of a force such as quartz glass similarly to the glass member 126 described above, and a light shielding film such as chromium is formed on the surface thereof, and a pinhole 103a is formed as a light transmitting portion in the center of the light shielding film. .
- a liquid repellent film having a liquid repellent material force such as the above-described fluorine-based resin material or acrylic resin material is formed.
- the uneven illuminance measuring instrument 104 described above has the same configuration as the uneven illuminance measuring instrument disclosed in JP-A-57-117238 and the corresponding US Pat. No. 4,465,368. It measures the illuminance unevenness of the illumination light IL via the liquid Lq on the image plane of the projection optical system PL. Then, the detection signal (photoelectric conversion signal) of the sensor composing the illuminance unevenness measuring instrument is supplied to the main controller 50 via a hold circuit (not shown) (for example, a peak hold circuit) and an analog Z digital (A ZD) change. Has been. To the extent permitted by national legislation in the designated country (or selected selected country) designated in this international application, the disclosures in the above publications and US patents are incorporated herein by reference.
- a slit plate 105 having a circular shape in plan view is arranged such that its surface is substantially flush with the surface of the plate member 101. Between the slit plate 105 and the plate member 101, for example, a gap E force having a width of about 0.3 mm is formed around the slit plate 105. Similar to the pattern plate 103, the slit plate 105 includes quartz glass and a light shielding film such as chromium formed on the surface of the quartz glass. A slit pattern extending in the axial direction is formed as a light transmitting portion.
- the slit plate 105 constitutes a part of an aerial image measuring instrument that measures the light intensity of the aerial image (projected image) of the pattern projected by the projection optical system PL.
- the projection optical system PL is placed inside the measurement table MTB (housing 120) below the slit plate 105.
- a light receiving system for receiving the illumination light IL applied to the plate member 101 via the liquid Lq via the slit pattern and for example, disclosed in Japanese Patent Application Laid-Open No.
- a wavefront aberration measuring pattern plate 107 having a circular shape in a plan view is arranged in a state where the surface thereof is substantially flush with the surface of the plate member 101.
- the wavefront aberration measurement pattern plate 107 includes quartz glass and a light shielding film such as chromium formed on the surface of the quartz glass, and a circular plate at the center of the light shielding film. An opening is formed.
- a liquid repellent film made of a liquid repellent material such as the above-mentioned fluorine-based resin material, or some other liquid repellent material such as an acrylic resin material is formed.
- a light receiving system including, for example, a microlens array that receives the illumination light IL through the projection optical system PL and the liquid Lq.
- the wavefront aberration measuring instrument disclosed in, for example, the pamphlet of International Publication No. 99Z60361 and the corresponding European Patent No. 1,079,223 is constituted.
- the disclosure in the above international publication pamphlet and the European patent specification is incorporated and made a part of this description.
- the pattern plate 103, the slit plate 105, and the wavefront aberration measurement pattern plate 107 described above each include at least a region facing each of the plate members 101 and an opening 101d of the plate member 101 facing the pattern plate 103.
- the inner wall surface, the inner wall surface of the opening 101e facing the slit plate 105, and the inner wall surface of the opening lOlf facing the wavefront aberration measurement pattern plate 107 are subjected to the same liquid repellent treatment as described above.
- discharge holes similar to the above-described discharge holes 120a are formed in the vicinity of the turn plate 103, in the vicinity of the slit plate 105, and in the vicinity of the wavefront aberration measurement pattern plate 107, respectively. ,this These exhaust holes are connected to the vacuum system of the recovery unit described above.
- the light receiving elements (sensors) constituting the various measuring instruments described above are arranged in the housing 120 in this embodiment!
- the light receiving elements and the cooling mechanism for the housing 120 are provided to avoid the influence of heat generation of the elements as much as possible.
- the cooling mechanism of the light receiving element include a combination of a heat sink provided on the bottom wall of the housing 120 and a Peltier element connected to the heat sink.
- a liquid cooling mechanism that allows a cooling liquid to flow inside the piping system can be employed.
- the exposure apparatus 100 of the present embodiment includes a force irradiation system 110a and a light receiving system 110b (see FIG. 6) (not shown in FIG. 1), for example, Japanese Patent Laid-Open No. 6-283403 (corresponding US Pat. 5, 448, 332) and the like, an oblique incidence type multipoint focal point detection system similar to that disclosed in Japanese Patent No. 5,448,332) is provided.
- FIG. 6 shows the main configuration of the control system of exposure apparatus 100.
- This control system is mainly configured of a main control device 50 composed of a microcomputer (or a workstation) that performs overall control of the entire device.
- reference numeral 143 indicates a group of measuring instruments such as an illuminance monitor 122, an illuminance unevenness measuring instrument 104, an aerial image measuring instrument, and a wavefront aberration measuring instrument provided on the above-described measurement table MTB.
- the main controller 50 controls the liquid immersion device 132 to always fill the liquid Lq directly below the front lens 191 of the projection optical system PL.
- FIG. 2 shows the step-and-scan method for wafer W on wafer stage WST (here, as an example, the last wafer of a lot (25 or 50 wafers)). The state in which the exposure is performed is shown. At this time, the measurement stage MST waits at a predetermined standby position without colliding with the wafer stage WST! /
- the above-described exposure operation is performed by the main controller 50 in advance, for example, in the HenstCode group.
- Inter-shot movement operation in which wafer stage WST is moved to the scan start position (acceleration start position) for exposure of each shot area on wafer W based on the results of wafer alignment such as global alignment (EGA)
- EGA global alignment
- a scanning exposure operation in which a pattern formed on the reticle R for each shot region is transferred by a scanning exposure method.
- the above exposure operation is performed in a state where the liquid Lq is held between the front lens 191 and the wafer W.
- the main control device 50 controls the stage drive system 124 based on the measurement value of the interferometer system 118, and Move measurement stage MST (measurement table MTB) to a position close to the Y side of wafer stage WST at the exposure end position.
- main controller 50 monitors the measurement value of the interferometer that measures the Y-axis direction position of each table in interferometer system 118, and sets measurement table MTB and wafer table WTB in the Y-axis direction, for example. They are kept away from each other by about 30 O / zm.
- the main controller 50 is not limited to this, and the Y side surface of the measurement table MTB and the + Y side surface of the wafer table WTB may be brought into contact with each other.
- main controller 50 starts the operation of simultaneously driving both stages WST and MST in the + Y direction while maintaining the positional relationship between wafer table WTB and measurement table MTB in the Y-axis direction.
- projection unit PU is moved along with the movement of wafer stage WST and measurement stage MST to the + Y side.
- the liquid Lq force held between the tip lens 191 and the wafer W Wafer W ⁇ Plate 93 ⁇ Measurement table MTB is moved sequentially. That is, the liquid Lq is held between the measurement table MTB and the tip lens 191.
- the main controller 50 controls the stage drive system 124 based on the measurement value of the interferometer system 118 based on the measured value of the wafer stage WST, and moves the wafer stage to a predetermined wafer exchange position.
- the stage WST is moved and replaced with the first wafer of the next lot, and in parallel with this, a predetermined measurement using the measurement stage MST is performed as necessary.
- a predetermined measurement for example, baseline measurement of alignment ALG is given as an example.
- main controller 50 a pair of reticle alignment marks on reticle R corresponding to a pair of first reference marks on reference mark plate FM provided on measurement table MTB is added to the above-mentioned reticle mark.
- the positional relationship between the pair of first fiducial marks and the corresponding reticle alignment marks is detected by simultaneously using the alignment systems RAa and RAb.
- the first reference mark is detected through the projection optical system PL and the liquid Lq.
- the main controller 50 detects the second fiducial mark on the fiducial mark plate FM with the alignment ALG, so that the positional relationship between the alignment center of the alignment ALG and the second fiducial mark is detected. Is detected.
- main controller 50 determines the positional relationship between the reticle alignment mark corresponding to the pair of first reference marks, the positional relationship between the detection center of alignment system ALG and the second reference mark, and the known pair of first reference marks. 1 Based on the positional relationship between the fiducial mark and the second fiducial mark, the distance (or positional relationship) between the projection center of the reticle pattern projected by the projection optical system PL and the detection center of the alignment system ALG, that is, the base of the alignment system ALG Ask for a line.
- main controller 50 sets measurement stage MST and wafer stage WST to the above-described proximity state, and thereby the wafer stage. While maintaining the positional relationship between the WST and the measurement stage MST in the Y-axis direction, while holding the liquid Lq under the projection optical system PL, both stages WST and MST are simultaneously driven in the Y direction. Then, after moving wafer stage WST (Weno) below projection optical system PL, measurement stage MST is retracted to a predetermined position.
- main controller 50 performs an exposure operation of a wafer alignment and step “and” scan method on the new wafer, and sequentially transfers the reticle pattern to a plurality of shot areas on the wafer. Thereafter, the same operation is repeated.
- the present invention is not limited to this, and measurement stage MST is performed while each wafer is replaced on wafer stage WST side. Measure illuminance, uneven illuminance measurement, aerial image measurement, wavefront aberration measurement, etc., and use the measurement results. It may be reflected in the exposure of Yeha.
- the projection optical system PL can be adjusted by the imaging characteristic correction controller 52 based on the measurement result.
- the above-mentioned aerial image measuring instrument, illuminance unevenness measuring instrument, illuminance monitor, and wavefront aberration measuring instrument need not all be provided, but only a part of the aerial image measuring instrument, illuminance unevenness measuring instrument, and wavefront aberration measuring instrument are mounted on the measurement stage MST as necessary. Good.
- main controller 50 controls liquid immersion device 132 to supply a predetermined amount of liquid Lq from liquid supply nozzle 131A and perform a liquid recovery nozzle while performing the series of operations described above.
- the 131B force also collects a predetermined amount of the liquid Lq, thereby continuing to fill the optical path space on the image plane side of the projection optical system PL with the liquid Lq.
- main controller 50 controls controller 80 to supply liquid Lq having a reduced specific resistance value from liquid supply nozzle 131A of liquid immersion apparatus 132.
- Main controller 50 determines the optical path space on the image plane side of projection optical system PL based on the physical properties of the film on the surface of wafer W (contact angle with liquid Lq, etc.) and the scanning speed of wafer W during exposure.
- the supply amount of the liquid Lq to be supplied from the liquid supply nozzle 131 A is determined, and the command value of the determined supply amount is input to the controller 80.
- the controller 80 controls the flow control solenoid valve 86A so that the liquid Lq in an amount corresponding to the supply amount command value from the main controller 50 is supplied from the liquid supply nozzle 131A.
- the flow rate control solenoid valve 86B is controlled while monitoring the specific resistance meter 76 so that the liquid Lq to which the 131A force is also supplied has a predetermined specific resistance value.
- the specific resistance value of the liquid Lq is adjusted to 10 [ ⁇ ⁇ cm] or less, preferably 0.1 to 1.0 [ ⁇ ⁇ ⁇ ].
- carbon dioxide (CO 2) is mixed in pure water and dissolved.
- the refractive index of pure water not containing diacid-carbon is different from that of illumination light IL, and this difference in refractive index cannot be ignored.
- the mixing ratio of carbon dioxide to pure water is a known desired value, and the refractive index of the liquid after the mixing can be measured in advance.
- the relationship between the mixing ratio of carbon dioxide with respect to pure water and the refractive index of the liquid after mixing is stored in the main control device 50, and the main control device 50 stores the diacid concentration based on the stored information.
- At least a part of the projection optical system PL may be adjusted via the controller 52.
- the pattern of the reticle R can be transferred onto the wafer W through the projection optical system PL and the liquid Lq with high accuracy without receiving the fluctuation of the refractive index of the liquid.
- main controller 50 may perform dose control (control of integrated exposure amount) for wafer W during scanning exposure in consideration of the transmittance variation.
- the main controller 50 switches the energy coarse adjuster inside the illumination system ILS, adjusts the pulse energy or emission frequency (repetition frequency) of the illumination light IL emitted from the light source, or the reticle stage RST.
- dose control is performed by controlling the scanning speed of the wafer stage WST.
- the reticle R pattern can be accurately transmitted through the projection optical system PL and the liquid Lq without being affected by fluctuations in the transmittance of the liquid with respect to the illumination light IL (or light having the same wavelength as the exposure light). Can be transferred onto wafer W.
- the liquid immersion apparatus 132 is a member disposed on the light exit side of the front end lens 191, that is, a part of the measurement table MTB (a plate member). 101 and / or a part of the surface of each measuring instrument) or a film (a liquid repellent film or a resist) on a part of wafer table WTB (a part of at least one of plate 93 and wafer W) Carbon dioxide that lowers the specific resistance of the liquid L q is mixed into the liquid supplied to form the immersion area on the film (resist film) (or the top coat layer formed so as to cover the resist). It has a mechanism to dissolve (dissolve).
- a discharge may occur between the liquid Lq and the liquid repellent HWRF may be damaged.
- the liquid contact surface of the liquid repellent film WRF is charged by contact with the charged liquid Lq, and a discharge (dielectric breakdown) occurs between the metal thin film 129 under the liquid repellent film WRF and the liquid repellent HWRF. May cause damage to the liquid repellent HWRF. If the liquid repellent film WRF is damaged (deteriorated), the optical properties of the liquid repellent film WRF may become non-uniform, or the liquid repellency may deteriorate and water stains (watermarks) may occur.
- the illuminance monitor 122 can perform high-precision illuminance measurement over a long period of time, and by performing exposure on the wafer W by reflecting the measurement result, high-precision exposure is performed over a long period of time. It becomes possible.
- the liquid repellent film on the upper surface of measurement stage MST can be prevented from being damaged by suppressing the charging of force liquid Lq described with reference to illuminance monitor 122. Further, by suppressing charging of the liquid Lq, damage (deterioration) of the liquid repellent film on the upper surface of the plate 93 of the wafer stage WST as well as the liquid repellent film on the upper surface of the measurement stage MST can be suppressed.
- the reticle R is illuminated by the illumination light IL, and the reticle R and the wafer W are moved synchronously with respect to the illumination light IL, and the projection optical system PL and Scanning exposure is performed in which the circuit pattern on the reticle R is transferred onto the wafer W via the liquid Lq.
- the resist film or topcoat film
- the resist film or topcoat film and resist film
- Discharge between the liquid Lq and the substrate of the wafer W (such as silicon) Breakage), which may damage or modify the resist film (or topcoat film and resist film).
- the resist film (or topcoat film) and the substrate of Weno and W (silicon, etc.) are charged.
- discharge (dielectric breakdown) may occur, and the resist film (or topcoat film) may be damaged or modified.
- the damaged partial force liquid Lq may permeate and cause a defect in the pattern formed on the wafer W.
- the reaction characteristics with respect to irradiation with the illumination light IL may change, and a desired pattern may not be formed on the wafer W.
- carbon dioxide carbon dioxide gas
- the liquid Lq having a reduced specific resistance value is supplied from the liquid supply nozzle 131 A.
- the dielectric breakdown of the resist film on the wafer W (when the top coat layer is formed on the resist film), the dielectric breakdown is effectively suppressed.
- the exposure apparatus 100 of the present embodiment transfers the pattern of the reticle R onto the wafer with high accuracy by performing exposure at a high resolution and a depth of focus as compared to the air by immersion exposure.
- transfer of a fine pattern of about 45 to 10 Onm as a device rule can be realized with ArF excimer laser light.
- the present invention is not limited to this, which is a force that uses a liquid in which carbon dioxide is dissolved in pure water (carbonated water) as the liquid Lq for immersion. .
- pure water carbonated water
- chlorine can be dissolved in pure water to prevent the liquid Lq from being charged.
- the specific resistance of the liquid is adjusted by adjusting the specific resistance of the liquid in order to prevent deterioration of the film on the object due to charging of the liquid. It is desirable to use a liquid in which a predetermined substance that can be adjusted is mixed and dissolved.
- the case where the mixing of the predetermined substance (carbon dioxide) into the liquid (pure water) is performed on the upstream side of the liquid temperature adjustment mechanism 72 is not limited to this.
- a predetermined substance may be mixed and dissolved in the liquid between the liquid adjustment mechanism that performs at least one of temperature adjustment and flow rate control of the liquid and the liquid supply nozzle.
- At least a part of the member forming the liquid Lq supply flow path may be formed of a material in which carbon dioxide (carbon dioxide) dissolves into the liquid Lq.
- the charge of the liquid Lq can be removed.
- the foreign object such as particles is prevented from adhering to the object due to the charging of the object and the charging of the nozzle member, the contamination of the liquid Lq, UE, and W caused by the foreign object should also be prevented. Can do.
- at least one of the top coat layer and the resist film formed on the wafer W and the above-described liquid repellent film on the object can be prevented from being deteriorated.
- the charge of the liquid Lq supplied to the space on the image plane side of the projection optical system PL may be removed. In this case, it is possible to more reliably prevent charging of the liquid Lq supplied to the space on the image plane side of the projection optical system PL.
- a static eliminator such as an ionizer as disclosed in Japanese Patent Application Laid-Open No. 2003-332218 is disposed in the vicinity of the space on the image plane side of the projection optical system PL.
- ions for example, negative ions
- the space on the image plane side around the liquid Lq
- the charge is removed by the static eliminator, so the liquid Lq, the wafer W, the object, the nozzle member, etc.
- Contaminants can be sucked to prevent liquid Lq and wafer W from being contaminated.
- a gas having a charge eliminating function for example, a gas containing ions
- a liquid leakage prevention function may be provided.
- a gas seal mechanism for preventing leakage of liquid forming an immersion region is provided.
- the wafer W (resist film and (Including at least one of the topcoat films) may be charged. Since the charged wafer W attracts foreign matters such as particles, the wafer W may be contaminated.
- a resist film (or topcoat film) on the surface of the wafer W is formed of a conductive material so as to prevent charging of the wafer and W (including at least one of the resist film and the topcoat film). Also good.
- the wafer holder that holds the wafer W is formed of a conductive material, or a contact member made of a conductive material that is in contact with the wafer W held by the wafer holder is disposed, so that the wafer W (resist film and top coat film) is arranged. (Including at least one of them) may be prevented.
- the liquid repellent film formed on the plate member 93 or the like may be made conductive.
- the charged wafer W (including at least one of the resist film and the topcoat film) may be unloaded, at least one of the wafers W and W before and after the exposure may be removed.
- the transport member to be transported may be formed of a conductive material so that the electric charges charged on the wafer W can be released (removed).
- a unit that soaks (for example, cleans) wafers and wafers with a conductive liquid (such as pure water in which carbon dioxide is dissolved) is transferred to the wafer W.
- a static eliminator such as ionizer may be arranged in the transfer path of the wafer W.
- a liquid removal unit is installed in the exposure apparatus 100 to remove the wet well after exposure and the liquid Lq droplets remaining on (attached to) the W, the charge removal can be done just by removing the liquid in the liquid removal unit. It is also desirable to do this.
- a temperature adjustment unit that adjusts the temperature of the wafer W before being loaded into the wafer stage WST is installed! You can do it.
- a substrate processing apparatus (a coating apparatus that unloads the wafer W before exposure to the exposure apparatus 100 and a developing apparatus into which the wafer W exposed by the exposure apparatus 100 is loaded) connected to the exposure apparatus 100 is provided.
- a unit that soaks (for example, cleans) the wafer W with a conductive liquid such as pure water in which carbon dioxide is dissolved
- a static eliminator may be arranged.
- a conductive rinse solution may be used when developing the exposed wafer W in the developing device into which the wafer W exposed by the exposure apparatus 100 is carried. If an interface unit is disposed between the exposure apparatus 100 and the substrate processing apparatus, it is possible to perform a charge removal process for removing charges from the wafer w in the interface unit.
- the exposure apparatus provided with measurement stage MST separately from wafer stage WST has been described.
- an object stage (wafer stage WST) on which an object that does not necessarily need to be provided with a measurement stage is placed.
- Various measuring instruments such as an illuminance motor 122 including a glass member 126 may be provided thereon. Even if it is difficult, highly accurate measurement can be performed over a long period of time using the illuminance monitor 122, etc. This can be done for a long time.
- the present invention relates to JP-A-10-163099 and JP-A-10-214783, and the corresponding US Pat. No. 6,341,007, and JP 2000-505958.
- the present invention can also be applied to a multi-stage type exposure apparatus having a plurality of wafers and stages for holding a wafer as disclosed in the gazette and US Pat. No. 5,969,441 corresponding thereto.
- national legislation in the designated country (or selected selected country) designated in this international application the disclosure in each of the above publications and corresponding US patents is incorporated herein by reference.
- the exposure apparatus to which the above-described liquid immersion method is applied is configured to expose the wafer W by filling the optical path space on the light emission side of the terminal optical element of the projection optical system PL with liquid (pure water).
- liquid pure water
- the optical path space on the light incident side of the terminal optical element of the projection optical system PL is also It may be filled with a liquid.
- the disclosure in the international publication pamphlet and the corresponding U.S. patent application publications will be used as part of this description. To do.
- an exposure apparatus that locally fills the liquid between the projection optical system PL and the wafer W is employed.
- the present invention is disclosed in JP-A-6-124873. Liquid immersion in which exposure is performed in a state where the entire surface of the wafer to be exposed is immersed in the liquid as disclosed in JP-A-10-303114, US Pat. No. 5,825,043, etc.
- the present invention can also be applied to an exposure apparatus.
- force using a light-transmitting mask in which a predetermined light-shielding pattern (or phase pattern 'dimming pattern) is formed on a light-transmitting substrate is used instead of this mask.
- a predetermined light-shielding pattern or phase pattern 'dimming pattern
- an electronic mask that forms a transmission pattern, a reflection pattern, or a light emission pattern based on electronic data of a pattern to be exposed may be used. Good.
- interference fringes are formed on the wafer W, so that a line 'and' space pattern is formed on the wafer W.
- the present invention can also be applied to an exposure apparatus (lithography system) that forms an image.
- the use of the exposure apparatus is not limited to the exposure apparatus for semiconductor manufacturing.
- an exposure apparatus for liquid crystal that transfers a liquid crystal display element pattern to a square glass plate, an organic EL, and a thin film magnetic head
- exposure devices for manufacturing image sensors (CCDs, etc.), micromachines, and DNA chips can also be widely applied to exposure devices for manufacturing image sensors (CCDs, etc.), micromachines, and DNA chips.
- glass substrates, silicon wafers, etc. are used to manufacture reticles or masks used in light exposure equipment, EUV exposure equipment, X-ray exposure equipment, electron beam exposure equipment, etc. that can be used only with micro devices such as semiconductor devices.
- the present invention can also be applied to an exposure apparatus that transfers a circuit pattern.
- the light source of the exposure apparatus of the above embodiment is not limited to the ArF excimer laser, but is a KrF excimer laser (output wavelength 248 nm), F laser (output wavelength 157 nm), Ar laser (output)
- Pulse laser light source such as 126nm wavelength, Kr laser (output wavelength 146nm), g-line (wave
- an ultra-high pressure mercury lamp that emits bright lines such as 436 nm long and i-line (wavelength 365 nm).
- a harmonic generator of a YAG laser can also be used.
- DFB semiconductor laser or fiber laser power single-wavelength laser light oscillated in the infrared or visible range is amplified by, for example, an erbium (or both erbium and ytterbium) force S-doped fiber amplifier and nonlinear Harmonics that have been wavelength-converted to ultraviolet light using an optical crystal may be used.
- the projection optical system may be not only a reduction system but also an equal magnification and an enlargement system.
- a semiconductor device has a function / performance design step of the device, a step of manufacturing a reticle based on this design step, a step of manufacturing a wafer from a silicon material, Lithography step, device assembly step (including dicing process, bonding process, knocking process), inspection step, etc. that transfer the pattern formed on the reticle onto the object such as wafer by the above-mentioned liquid immersion light by exposure equipment It is manufactured after.
- the above-described immersion exposure method is executed using the exposure apparatus of the above-described embodiment, and a device pattern is formed on the object. Therefore, a highly integrated device can be manufactured with a high yield. .
- the exposure method and exposure apparatus of the present invention are suitable for exposing an object via a liquid.
- the device manufacturing method of the present invention is suitable for manufacturing micro devices.
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Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
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JP2007514659A JP5125505B2 (ja) | 2005-04-25 | 2006-04-21 | 露光方法及び露光装置、並びにデバイス製造方法 |
KR1020137000873A KR101344142B1 (ko) | 2005-04-25 | 2006-04-21 | 노광 방법, 노광 장치, 및 디바이스 제조 방법 |
KR1020077002004A KR101396620B1 (ko) | 2005-04-25 | 2006-04-21 | 노광 방법, 노광 장치, 및 디바이스 제조 방법 |
EP06732193A EP1876635A4 (en) | 2005-04-25 | 2006-04-21 | EXPOSURE METHOD, EXPOSURE APPARATUS, AND DEVICE MANUFACTURING METHOD |
KR1020137021972A KR101466533B1 (ko) | 2005-04-25 | 2006-04-21 | 노광 방법, 노광 장치 및 액체 공급 방법 |
US11/640,842 US8064039B2 (en) | 2005-04-25 | 2006-12-19 | Exposure method, exposure apparatus, and device manufacturing method |
US13/317,169 US9335639B2 (en) | 2005-04-25 | 2011-10-12 | Exposure method, exposure apparatus, and device manufacturing method |
US15/145,561 US9618854B2 (en) | 2005-04-25 | 2016-05-03 | Exposure method, exposure apparatus, and device manufacturing method |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2005-127025 | 2005-04-25 | ||
JP2005127025 | 2005-04-25 | ||
JP2005238373 | 2005-08-19 | ||
JP2005-238373 | 2005-08-19 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/640,842 Continuation US8064039B2 (en) | 2005-04-25 | 2006-12-19 | Exposure method, exposure apparatus, and device manufacturing method |
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WO2006115186A1 true WO2006115186A1 (ja) | 2006-11-02 |
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PCT/JP2006/308385 WO2006115186A1 (ja) | 2005-04-25 | 2006-04-21 | 露光方法及び露光装置、並びにデバイス製造方法 |
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US (3) | US8064039B2 (ja) |
EP (1) | EP1876635A4 (ja) |
JP (5) | JP5125505B2 (ja) |
KR (3) | KR101396620B1 (ja) |
WO (1) | WO2006115186A1 (ja) |
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Also Published As
Publication number | Publication date |
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KR101396620B1 (ko) | 2014-05-16 |
KR20130105922A (ko) | 2013-09-26 |
KR20130012035A (ko) | 2013-01-30 |
US9618854B2 (en) | 2017-04-11 |
US20120044469A1 (en) | 2012-02-23 |
JP2014057103A (ja) | 2014-03-27 |
JP2015146043A (ja) | 2015-08-13 |
JP5594646B2 (ja) | 2014-09-24 |
JP5125505B2 (ja) | 2013-01-23 |
US20070139632A1 (en) | 2007-06-21 |
US9335639B2 (en) | 2016-05-10 |
KR101344142B1 (ko) | 2013-12-23 |
US20160246184A1 (en) | 2016-08-25 |
KR101466533B1 (ko) | 2014-11-27 |
EP1876635A4 (en) | 2010-06-30 |
KR20070122442A (ko) | 2007-12-31 |
JP2010245572A (ja) | 2010-10-28 |
US8064039B2 (en) | 2011-11-22 |
JP6249179B2 (ja) | 2017-12-20 |
JP5594653B2 (ja) | 2014-09-24 |
EP1876635A1 (en) | 2008-01-09 |
JPWO2006115186A1 (ja) | 2008-12-18 |
JP2012129557A (ja) | 2012-07-05 |
JP5831825B2 (ja) | 2015-12-09 |
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