JP6564946B2 - Plasma processing equipment - Google Patents

Description

  The present invention relates to a plasma processing apparatus such as a plasma CVD apparatus.

  In general, a plasma CVD apparatus generates a plasma of a film forming gas in a film forming space (reaction chamber) between a high frequency electrode (cathode) and a stage (anode), thereby depositing the reaction product on a substrate on the stage. Let Around the stage, a plurality of ground members electrically connected to the vacuum chamber are provided. These ground members form a return current path for returning a high-frequency current from the stage to the power source through the vacuum chamber.

  Here, if the return current path is not optimized, an unintended discharge may occur in a place other than between the cathode and the anode. For example, if the return current paths are anisotropically sparsely and densely formed, the return currents are concentrated on the dense paths, and an electric field distribution / electric field gradient is generated near the paths other than the film formation space. As a result, local discharge occurs, and the in-plane uniformity such as the film thickness may decrease.

  Therefore, in the existing plasma CVD apparatus, the length of each ground member is shortened to reduce the electrical resistance of the return current path, the contact resistance between components is reduced, the return current path is not spatially biased, Measures are taken such as optimizing the electric field strength distribution to avoid unnecessary electric field gradients.

  On the other hand, an opening for carrying the substrate into or out of the vacuum chamber is provided on a part of the side wall of the chamber. Normally, the outer surface side of the side wall of the opening is opened and closed by a door valve, and the inner surface side of the side wall of the opening is normally open. The return current path that passes through the side wall portion in which such an opening is formed needs to bypass the periphery of the opening or pass through a door valve at the back of the opening. For this reason, the return current path that passes through the side wall portion in which the opening is formed becomes longer than the return current path that passes through the other side wall portions, which causes unnecessary electric field distribution and electric field gradient. Become.

  In order to solve such a problem, for example, Patent Document 1 discloses a plasma processing apparatus in which a second door valve that opens and closes a substrate loading / unloading portion formed on a side wall of a chamber from the inside of the chamber is configured as a part of a return current path. It is disclosed. Further, in Patent Document 2, a plurality of contact members installed around a substrate support are lifted together with the substrate support, and are brought into contact with a plurality of plates provided at the upper part of the substrate transfer port, respectively. A plasma processing system is disclosed.

WO 2010/079756 Japanese Patent No. 5883652

  However, in Patent Document 1, there is a problem that the return current path becomes long because the ground plate extending from the outer peripheral edge of the heater (stage) is connected to the bottom of the vacuum chamber. Further, in Patent Document 2, since each contact member is connected to each plate in conjunction with the rise of the substrate support (stage), for example, when the stage is large, each contact member is applied to each plate with equal pressing force. It becomes difficult to make contact, making it impossible to make the return current path uniform or to ensure symmetry.

  In view of the circumstances as described above, an object of the present invention is to provide a plasma processing apparatus capable of shortening a return current path and ensuring symmetry.

In order to achieve the above object, a plasma processing apparatus according to an embodiment of the present invention includes a chamber body, a stage, a high-frequency electrode, a plurality of ground members, and a movable unit.
The chamber body has a side wall partially including an opening through which the substrate can pass.
The stage has a support surface capable of supporting the substrate, and is installed inside the chamber body.
The high-frequency electrode is arranged to face the support surface and is configured to be able to generate a process gas plasma.
The plurality of ground members are arranged around the stage and electrically connect the side wall and the stage.
The movable unit includes a support that supports a first ground member that is a part of the plurality of ground members. The movable unit includes a first position where the first ground member faces the inner peripheral surface of the opening with the opening interposed therebetween, and the first ground member is electrically connected to the inner peripheral surface. It is possible to move the support in the axial direction perpendicular to the support surface between the second position and the second position.

  In the plasma processing apparatus, the plurality of ground members are connected between the periphery of the stage and the side wall (peripheral wall) of the chamber body. Therefore, the return current path can be shortened as compared with the configuration in which the ground member is connected to the stage and the bottom of the chamber body.

  On the other hand, an opening for carrying in and out the substrate is provided in a part of the side wall of the chamber body. The ground member (first ground member) connected to the side wall portion in which the opening is formed is supported by the support body that is movable in the axial direction inside the opening. The support waits at the first position when the substrate passes through the opening, and moves to the second position when the plasma is generated to electrically connect the first ground member to the inner peripheral surface of the opening. Connecting. As a result, a return current path that does not bypass the opening is constructed, so that symmetry of the return current path can be ensured on the entire circumference of the side wall.

The support may include a conductive contact portion that contacts the inner peripheral surface at the second position, and the contact portion may be configured to be elastically deformable in the axial direction.
Thereby, the stable electrical connection between a support body and an opening part internal peripheral surface is ensured.

In this case, the support body may further include a seal ring disposed around the contact portion. The seal ring is in elastic contact with the inner peripheral surface at the second position.
Thereby, since it is possible to avoid the process gas introduced into the chamber body and the reaction product from coming into contact with the contact portion, the durability of the contact portion is enhanced.

The support may be composed of a metal block.
Thus, the first ground member can be electrically connected to the side wall of the chamber body via the support.

The second position typically has a height from the bottom of the chamber body at a connection position with the side wall of the second ground member, which is another part of the plurality of ground members, and substantially Set to the same height.
Thereby, the symmetry of the return current path can be ensured.

  The stage may be configured to be movable along the axial direction. In this case, the plurality of ground members are each composed of a plurality of flexible metal plates each having a first end connected to the side wall and a second end connected to the stage.

The support may have a rectangular parallelepiped shape extending along the longitudinal direction of the opening, and the first ground member may include a plurality of conductor portions arranged at intervals in the longitudinal direction.
Thereby, even if the opening is relatively wide, an appropriate return current path can be ensured.

In order to achieve the above object, a plasma processing apparatus according to an embodiment of the present invention includes a chamber body, a stage, a high-frequency electrode, a plurality of ground members, a movable unit, and a collection member.
The chamber main body has a side wall, and the side wall partially has an opening having a first inner peripheral surface through which a substrate can pass and a second inner peripheral surface facing the first inner peripheral surface. Included.
The stage has a support surface capable of supporting the substrate, and is installed inside the chamber body.
The high-frequency electrode is arranged to face the support surface and is configured to be able to generate a process gas plasma.
The plurality of ground members are arranged around the stage and electrically connect the side wall and the stage.
The movable unit includes a support that supports a first ground member that is a part of the plurality of ground members. The movable unit includes a first position where the support body is opposed to the first inner wall of the side wall which is continuous with the first inner peripheral surface, and a first position of the side wall where the support body is continuous with the second inner peripheral surface. It is comprised so that the said support body can be moved between the 2nd positions electrically connected to two inner walls.
The collection member is disposed immediately below a portion where the support is in contact with the second inner wall.

  In the plasma processing apparatus, the plurality of ground members are connected between the periphery of the stage and the side wall (peripheral wall) of the chamber body. Therefore, the return current path can be shortened as compared with the configuration in which the ground member is connected to the stage and the bottom of the chamber body.

  On the other hand, an opening for carrying in and out the substrate is provided in a part of the side wall of the chamber body. A grounding member (first grounding member) connected to the side wall portion in which the opening is formed has a first position facing the first inner wall of the side wall continuous with the first inner peripheral surface, and a second position It is supported by a support that is movable between a second position that is electrically connected to the second inner wall of the side wall that is continuous with the inner peripheral surface. The support waits at the first position when the substrate passes through the opening, and moves to the second position when the plasma is generated to electrically connect the first ground member to the inner peripheral surface of the opening. Connecting. As a result, a return current path that does not bypass the opening is constructed, so that symmetry of the return current path can be ensured on the entire circumference of the side wall.

  Further, a collecting member is disposed immediately below a portion where the support body is in contact with the second inner wall. Thereby, even if a support body contacts the 2nd inner wall and generates dust, a collection member collects dust.

The movable unit includes a first driving unit that moves the support body between a third position facing the second inner wall and the first position, the third position, and the second position. You may have the 2nd drive part which moves the said support body between positions.
Thereby, when a support body moves between the 1st position and the 2nd position, it passes through the 3rd position away from the 2nd position. As a result, the collection member does not come into contact with the support, and dust generation due to contact between the collection member and the support does not occur.

A concave portion that communicates with the opening is formed in the inner wall of the side wall, and the first inner wall and the second inner wall may be part of the bottom of the concave portion.
Thereby, a support body can be stored in the recessed part provided in the side wall, and the space between a support body and a stage is ensured.

  As described above, according to the present invention, it is possible to shorten the return current path and ensure symmetry. Thereby, generation | occurrence | production of the unintended local discharge can be suppressed.

It is a schematic sectional side view which shows the plasma processing apparatus which concerns on one Embodiment of this invention. It is a schematic sectional side view which shows the board | substrate carrying in / out process in the said plasma processing apparatus. It is a schematic sectional drawing which shows the internal planar structure of the principal part of the said plasma processing apparatus. It is a schematic diagram which shows one structural example of the earth member in the said plasma processing apparatus. It is a partially broken perspective view of the support body in the said plasma processing apparatus. It is a schematic sectional drawing of the principal part which shows the relationship between the said support body and the opening part of a chamber main body. It is the schematic explaining the electric current path | route at the time of the film-forming in the said plasma processing apparatus (at the time of plasma generation). It is the schematic explaining the electric current path | route of the plasma processing apparatus which concerns on a comparative example. It is a schematic perspective view which shows the modification of the structure of the said support body. It is a schematic sectional drawing which shows the modification of the drive system which drives the support body in the said plasma processing apparatus. It is a schematic sectional drawing which shows the modification of the drive system which drives the support body in the said plasma processing apparatus. It is a schematic sectional drawing which shows the modification of the drive system which drives the support body in the said plasma processing apparatus. It is a partially broken perspective view of a support used in a modification of the drive system. It is a partial fracture perspective view of the above-mentioned collection member. It is a partial fracture perspective view of the modification of the above-mentioned collection member. It is a schematic sectional drawing which shows the modification of the plasma processing apparatus which comprises the drive system of the said modification. It is a schematic sectional drawing which shows the modification of the plasma processing apparatus which comprises the drive system of the said modification. It is a schematic sectional drawing which shows the modification of the plasma processing apparatus which comprises the drive system of the said modification.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, a plasma CVD (Chemical Vapor Deposition) apparatus will be described as an example of the plasma processing apparatus.

1 and 2 are schematic side cross-sectional views showing the configuration of the plasma CVD apparatus according to the present embodiment. FIG. 1 shows the film formation, and FIG. 2 shows the substrate carry-in / out.
In each figure, an X axis, a Y axis, and a Z axis indicate three axis directions orthogonal to each other, the X axis and the Y axis correspond to the horizontal direction, and the Z axis corresponds to the height direction.

[overall structure]
The plasma CVD apparatus 100 has a vacuum chamber 10. The vacuum chamber 10 has a film forming chamber 11 inside. The vacuum chamber 10 is connected to a vacuum pump (not shown), and is configured to be able to evacuate and maintain the film forming chamber 11 in a predetermined reduced pressure atmosphere.

  The vacuum chamber 10 includes a chamber body 12, a high frequency electrode 13, and an insulating member 14.

  The chamber body 12 is made of a metal material such as stainless steel or aluminum alloy. The chamber main body 12 is formed in a rectangular parallelepiped shape having a bottom 121 and side walls (peripheral walls) 122 including four side walls standing around the bottom 121.

  The side wall 122 has a side wall part 122a that partially includes an opening 123 through which the substrate W can pass in the X-axis direction. The opening 123 is configured as a loading / unloading port for carrying the substrate W into the film forming chamber 11 or carrying the substrate W out of the film forming chamber 11. The opening 123 has a width and a height through which a substrate and a substrate transfer device (not shown) can pass. A door valve 51 capable of opening and closing the opening 123 is provided outside the side wall 122a.

  As the substrate W, a rectangular glass substrate is typically used. The size of the substrate W is not particularly limited. For example, a substrate of G5 or more (the length of one side is 1000 mm or more) is used. In the present embodiment, for example, a G6 substrate (1850 mm × 1500 mm) is used.

  A stage 20 is installed inside the chamber body 12. The stage 20 has a support surface 21 that supports the substrate W. The support surface 21 is a rectangular plane having a larger area than the substrate W. The stage 20 contains a heating source capable of heating the entire support surface 21 to a predetermined temperature. The heating source is not particularly limited, and typically includes a heater, a heating medium circulation passage, and the like. The stage 20 has an appropriate chucking mechanism (not shown) such as an electrostatic chuck or a mechanical chuck that holds the substrate W on the support surface 21.

  The stage 20 has a lifting shaft 22 and is configured to be movable up and down in the Z-axis direction by a driving source 23 installed outside the bottom 121 of the chamber body 12. The elevating shaft 22 is fixed to the center of the bottom of the stage 20 and penetrates the bottom 121 of the chamber body 12 in an airtight manner. The stage 20 is configured to be able to move up and down between a raised position shown in FIG. 1 and a lowered position shown in FIG. The raising / lowering operation of the stage 20 is controlled by the controller 90.

  The high-frequency electrode 13 is placed on the upper portion of the chamber body 12 via an insulating member 14 (not electrically connected to the chamber body 12) so as to face the support surface 21 of the stage 20 with a predetermined interval in the Z-axis direction. Installed). The high frequency electrode 13 is made of a metal material and includes an electrode flange 31 and a shower plate 32.

  The electrode flange 31 is electrically connected to the high frequency power source 42 via the matching box 41. The electrode flange 31 is connected to the gas supply line 43 and has a space portion 311 into which a process gas (film forming gas) supplied via the gas supply line 43 is introduced. The shower plate 32 is fixed to the lower end of the electrode flange 31 and has a plurality of holes for supplying the process gas introduced into the space 311 over the entire area of the substrate W on the stage 20. The high-frequency electrode 13 generates a process gas plasma P (see FIG. 1) in the film forming chamber 11 between the shower plate 32 and the stage 20 when a high-frequency voltage is applied from a high-frequency power source 42.

  The frequency of the high-frequency power source 42 is not particularly limited, and is appropriately selected from 10 to 100 MHz, for example, and is 27.12 MHz in the present embodiment.

  The type of process gas is not particularly limited, and can be set as appropriate according to the type of material to be deposited. The process gas may include a carrier gas such as helium, argon and nitrogen in addition to the source gas. In the present embodiment, the plasma CVD apparatus 100 forms a thin film of a silicon compound such as amorphous silicon, silicon nitride, or silicon oxide on the substrate W.

  The insulating member 14 is disposed between the chamber body 12 and the high frequency electrode 13. The insulating member 14 is made of an electrically insulating material such as ceramics formed in an annular shape so as to be able to support the lower peripheral edge of the high-frequency electrode 13 (electrode flange 31). The insulating member 14 is fixed to the chamber main body 12 and the high-frequency electrode 13 via a sealing member such as a seal ring (not shown).

  The high frequency electrode 13 is covered with a shield cover 15. The shield cover 15 is disposed on the upper portion of the chamber body 12 and covers the high-frequency electrode 13 without contacting the electrode flange 31. The atmospheric pressure is maintained between the shield cover 15 and the electrode flange 31. The shield cover 15 is made of a metal material and is electrically connected to the chamber body 12 and the ground potential.

  The plasma processing apparatus 100 of this embodiment further includes a plurality of ground members 60. The plurality of ground members 60 are arranged around the stage 20 and electrically connect the side wall 122 of the vacuum chamber 10 and the stage 20.

  FIG. 3 is a schematic cross-sectional view showing the internal planar structure of the chamber body 12. As shown in the figure, the plurality of ground members 60 include a plurality of first ground plates 61 and a plurality of second ground plates 62.

  The first ground plate 61 (first ground member) is disposed between the side wall 122a having the opening 123 and one peripheral edge of the stage 20 facing the side wall 122a. The second ground plate 62 (second ground member) is disposed between the other three side wall portions 122b, 122c, and 122d other than the side wall portion 122a and the other peripheral edge portion of the stage 20 facing these. The The ground plates 61 and 62 are arranged at substantially equal intervals along each side of the stage 20.

  Each ground plate 61 and 62 typically has the same configuration, and in this embodiment, the first end 601 connected to the side wall 122 and the second end 602 connected to the stage 20 are provided. Each is made of a flexible (flexible) metal plate, and is bent in the vertical direction so as to be able to follow up and down movement of the stage 20 (see FIGS. 1 and 2). Each of the ground plates 61 and 62 is made of a nickel-base alloy or aluminum alloy having a thickness of about 0.1 mm and a width of about 10 mm, but is not limited to this. It is not limited.

  Each of the ground plates 61 and 62 may be configured independently, or may be configured by a connection body of a plurality of ground plates. FIG. 4 is a schematic diagram showing a connection structure of the second ground plate 62. As shown in the figure, by forming a plurality of slots (openings) 60s in parallel in the surface of a single rectangular flexible metal plate 600, the upper end and the lower end are connected to each other in the figure. In addition, a connection body of a plurality of second ground plates 62 is formed. According to this configuration, the ground plates 62 can be collectively connected to the side wall 122 and the stage 20 with the upper and lower ends of the metal plate 600 as the first and second ends 601 and 602, respectively. The connection method is not particularly limited, and typically, a plurality of fasteners such as screws are used.

  Here, the end portion 601 of the second ground plate 62 connected to the side wall portions 122b to 122d without the opening 123 is directly connected to the side wall portions 122b to 122d. On the other hand, the end 601 of the first ground plate 61 connected to the side wall 122 a having the opening 123 is connected to the side wall 122 a through the support 71 of the movable unit 70.

  The movable unit 70 includes a support 71 that supports the end 601 of the first ground plate 61 and a drive source 72 that moves the support 71 along the Z-axis direction. The movable unit 70 includes a first position where the first ground plate 61 faces the inner peripheral surface of the opening 123 with the opening 123 interposed therebetween, and the first ground plate 61 is electrically connected to the inner peripheral surface. The support body 71 can be moved (lifted / lowered) in the Z-axis direction between the second position and the second position.

  The shape of the support 71 is not particularly limited as long as the first ground plate 61 is electrically connected to the inner peripheral surface of the opening 123 at the second position.

  Subsequently, an example of the configuration of the support 71 will be described with reference to FIGS. 5 and 6. FIG. 5 is a partially broken perspective view of the support body 71, and FIG. 6 is a schematic cross-sectional view of the main part showing the relationship between the support body 71 and the opening 123.

  The support 71 is disposed at the end of the opening 123 on the inner surface side of the side wall 122a. As shown in FIG. 6, the support 71 supports the first end 601 of each ground plate 61 arranged in the Y-axis direction, and is retracted on the lower inner peripheral surface 123 a of the opening 123. It is configured to be able to move between a lowered position (first position) retracted to the part V and an elevated position (second position) in contact with the upper inner peripheral surface 123b of the opening 123.

  The retracting portion V is formed to a size that can accommodate the support 71. In the retracting portion V, the support 71 faces the upper inner peripheral surface 123b of the opening 123 through the opening 123. The gap between the support 71 and the upper inner peripheral surface 123b of the opening 123 at the lowered position is not particularly limited, and is set to a size that allows at least the substrate W to pass through the opening 123.

  The drive source 72 is installed outside the bottom 121 of the chamber body 12 and is typically composed of a fluid pressure cylinder such as an air cylinder or a hydraulic cylinder. However, a ball screw mechanism may be employed. The drive source 72 has a drive shaft 73 that hermetically penetrates the bottom 121 of the chamber body 12 and is connected to the bottom of the support 71, and the support 71 is placed between the first position and the second position. It can be moved up and down in the Z-axis direction.

  In this embodiment, the support body 71 is configured by a rectangular parallelepiped metal block 710 having a long side in the Y-axis direction (extending along the longitudinal direction of the opening 123). Thereby, the contact area with respect to the upper inner peripheral surface 123b of the opening 123 is increased, and it is possible to achieve substantially uniform contact between the support 71 and the side wall 122a in the Y-axis direction (width direction of the opening 123). it can. The support body 71 may be divided into a plurality of parts in the width direction of the opening 123 and each may be configured to be movable up and down individually or in common.

  The metal block 710 is made of, for example, stainless steel or aluminum alloy. One side surface of the metal block 710 (the side surface facing the peripheral edge of the stage 20) is a support surface 711 that supports the end 601 of each ground plate 61 in common, and the upper surface of the metal block 710 is the inside of the opening 123. It is set as the opposing surface 712 which opposes a wall surface.

  The end portion 601 of each ground plate 61 is fixed to the support surface 711 so as to be in surface contact. As a result, the contact resistance between each ground plate 61 and the support 71 is reduced. The fixing method is not particularly limited, and mechanical fixing using a plurality of screws, welding, or the like can be employed.

  A conductive sheet 714 is fixed to the facing surface 712 via an elastic member 713. The elastic member 713 is disposed at the center of the facing surface 712 so as to protrude upward from the facing surface 712 by a predetermined height. The elastic member 713 is configured by a plate-like or shaft-like member that is long in the Y-axis direction, and the cross-sectional shape in the direction perpendicular to the axis (cross-sectional shape parallel to the XZ plane) is formed in a rectangular shape or a dome shape that protrudes upward Is done. The constituent material of the elastic member 713 is not particularly limited, and is typically made of rubber or elastomer.

  The conductive sheet 714 is formed of a metal sheet that is long in the Y-axis direction and is fixed to the central portion of the facing surface 712 so as to cover the elastic member 713. The conductive sheet 714 is formed of a flexible metal plate, and the peripheral edge thereof is fixed to the facing surface 712 via a plurality of fasteners such as screws. The region where the conductive sheet 714 covers the elastic member 713 constitutes a contact portion 71A that contacts the upper inner peripheral surface 123b of the opening 123 at the second position. The contact portion 71A is configured to be elastically deformable in the Z-axis direction via an elastic member 713.

  The support body 71 further includes a seal ring 715 disposed around the contact portion 71A. The seal ring 715 is installed on the facing surface 712 so as to surround the conductive sheet 714. The seal ring 715 blocks the contact portion 71A from the reaction chamber 11 by elastically contacting the upper inner peripheral surface 123b of the opening portion 123 at the second position. This prevents the process gas and its reaction product from adhering to the contact portion 71A.

  The drive source 72 of the movable unit 70 is controlled by the controller 90. The controller 90 is configured by a computer having a CPU and a memory. In the film forming process shown in FIG. 1, the controller 90 moves the stage 20 to the raised position and the support 71 to the second position. On the other hand, in the substrate carry-in / out step shown in FIG. 2, the controller 90 moves the stage 20 to the lowered position and the support 71 to the first position. The controller 90 may be configured to be able to control the entire operation of the plasma CVD apparatus 100 such as the raising / lowering operation of the stage 20 and the drive control of the movable unit 70 and the application of a high-frequency voltage to the gas supply line 43 and the high-frequency electrode 13. Good.

[Operation]
Subsequently, a typical operation of the plasma CVD apparatus of this embodiment will be described.

  In the film forming process shown in FIG. 1, the film forming chamber 11 is depressurized to a predetermined pressure, and the substrate W is heated to a predetermined temperature on the stage 20 in the raised position. The high frequency electrode 13 supplies the process gas introduced through the gas introduction line 43 to the film forming chamber 11 through the space 311 and the shower plate 32. The high-frequency electrode 13 is applied with high-frequency power from a high-frequency power source 42 (matching box 41), and generates a process gas plasma P between the high-frequency electrode 13 and the stage 20. Thereby, the raw material gas in the process gas is decomposed, and the decomposition products are deposited on the substrate W, whereby film formation is performed.

  FIG. 7 is a schematic diagram for explaining a current path (see a broken line arrow in the drawing) of the plasma processing apparatus 100 during film formation (when plasma is generated). The support 71 in the movable unit 70 is in a second position where it contacts the upper inner peripheral surface 123b of the opening 123, and the stage 20 is connected to the chamber body 12 via the first and second ground plates 61 and 62. It is electrically connected to the side wall 122 (122a to 122d). The ground member 60 and the side wall 122 form a return current path for returning current from the stage 20 to the matching box 41 through the chamber body 12 and the shield cover 15.

  After film formation, the gas supply and power supply to the high-frequency electrode 13 are stopped, and the stage 20 starts to move to the lowered position shown in FIG. On the other hand, the support 71 in the movable unit 70 is also lowered to the retracted position (first position) shown in FIGS. Next, the door valve 51 is opened, and a substrate W that has been formed is carried out from the stage 20 to the outside of the vacuum chamber 10 through the opening 123 by a substrate transfer device (not shown), and the substrate W that has not been formed is transferred to the vacuum chamber. 10 is carried into the interior. Thereafter, the door valve 51 is closed, the stage 20 and the support 71 are raised, and the film forming process similar to that described above is performed.

  By the way, if the return current path of the high-frequency current at the time of film formation is not optimized, an unintended discharge may occur in a place other than between the cathode (high-frequency electrode 13) and the anode (stage 20). For example, when the ground plate 61 is connected to the inner surface of the side wall immediately below the opening 123 as shown in FIG. 8, the return current path passing through the side wall bypasses the periphery of the opening 123 or the opening Since it passes through the door valve 51 at the back of 123, the return current path is long or anisotropically densely and unevenly formed. For this reason, local discharge occurs, and the in-plane uniformity of film quality or film thickness may be reduced.

  In the present embodiment, among the ground members 60, the first ground plate 61 is connected to the side wall portion 122a via the support 71, and the second ground plate 62 is directly connected to the side wall portions 122b to 122d. Connected. Therefore, the return current path can be shortened as compared with the configuration in which the ground member is connected between the stage and the bottom of the chamber.

  On the other hand, the first ground plate 61 connected to the side wall 122a in which the opening 123 is formed is supported by a support 71 that can move up and down in the Z-axis direction inside the opening 123. The support 71 waits at the first position when the substrate passes through the opening 123 (FIG. 2), and moves to the second position when the plasma is generated to move the first ground plate 61 to the opening 123. Is electrically connected to the upper inner peripheral surface 123b (FIG. 1). Thereby, since a return current path that does not bypass the opening 123 is constructed, symmetry of the return current path is ensured in the entire circumference of the side wall 122, and the film quality and film thickness uniformity on the substrate are improved.

  In order to make the return current paths uniform or improve the symmetry, it is preferable that the lengths of the return current paths are the same. In addition, for example, the connection positions of the ground plates 60 and 61 and the side wall 122 are preferably set to have substantially the same height with respect to the bottom 121 of the chamber body 12. In this case, the second position of the support 71 is set to be substantially the same height as the height from the bottom 121 of the vacuum chamber 10 at the connection position with the side walls 122b to 122d of the second ground plate 62. (See FIG. 2).

  Further, according to the present embodiment, since the contact surface 71A that is elastically deformable in the Z-axis direction is provided on the facing surface 712 of the support 71, the support 71 is opened with an appropriate pressing force at the second position. It is possible to stably contact the upper inner peripheral surface 123b of the portion 123.

  Further, since the seal ring 715 disposed so as to surround the contact portion 71A is provided on the opposing surface 712 of the support 71, the contact portion 71A is exposed to the film forming chamber 11 in the film forming process. Can be prevented. This prevents the process gas and its plasma reaction product from coming into contact with the contact portion 71A, and even when highly corrosive gas is used, the contact portion 71A is protected from the corrosion and the durability is improved. Can do. Further, even when dust is generated by contact between the contact portion 71 </ b> A and the opening 123, the dust is prevented from leaking into the film forming chamber 11. As a result, a high-quality film forming process can be performed stably.

  Furthermore, in the present embodiment, the drive source 72 that raises and lowers the support 71 is configured separately from the drive source 23 that raises and lowers the stage 20. For this reason, the positioning accuracy of the rising position (second position) of the support 71 can be ensured even in the case where the up-and-down movement amount of the stage 20 changes according to the specifications of the film forming process. In addition, the raising / lowering movement of the stage 20 and the support body 71 may be controlled and controlled in synchronization with each other.

[Summary]
As described above, according to the present embodiment, the return current path passing through the side wall part 122a having the opening 123 and the return current path passing through the other side wall parts 122b to 122d have the same or substantially the same path length. Since it can be configured, shortening, equalization, or symmetry of the return current path is ensured. Thereby, generation | occurrence | production of a local abnormal discharge is prevented and the film-forming process excellent in the film thickness and the uniformity of film quality can be performed.

  In particular, in the present embodiment, a high frequency power supply in the VHF band of 27.12 MHz is employed as the high frequency power supply 42. For this reason, it is possible to realize a high film formation rate and film densification that cannot be achieved by a high frequency power supply of 13.56 MHz by increasing the density of plasma.

  On the other hand, since the plasma density is high due to the adoption of the VHF band power supply, the return current becomes large, and there is a concern that the discharge stability is deteriorated unless the return current path is optimized. The local discharge (discharge leakage) due to the non-uniformity of the return current path increases the ion flux in proportion to the square of the cosine (cos) of the frequency, so a large electric field gradient is generated due to a slight difference in the return current path length. Even if the path length does not cause discharge leakage at 13.56 MHz, discharge leakage may occur at 27.12 MHz.

  According to the present embodiment, non-uniformity between the return current path passing through the side wall 122a having the opening 123 for carrying in and out the substrate and the return current path passing through the other side walls 122b to 122d is eliminated. Therefore, even when a high frequency power supply of 27.12 MHz is employed, stable film formation can be realized without causing local discharge. Further, according to the present embodiment, since the ground plate 61 connected to the opening 123 is configured to be movable inside the opening 123, the substrate loading / unloading operation via the opening 123 is not hindered. The above-described effects can be easily realized.

  As mentioned above, although embodiment of this invention was described, this invention is not limited only to the above-mentioned embodiment, Of course, a various change can be added.

  For example, in the above-described embodiment, the example in which the contact surface 71A and the seal ring 715 that are elastically deformable in the Z-axis direction are provided on the facing surface 712 of the metal block 710 as the support 71 has been described. For example, as shown in FIG. 9A, a support body 171 composed only of a metal block 710 that does not include the abutting portion or the seal ring may be employed. Also with such a configuration, the first ground plate 61 and the side wall 122a can be electrically connected by bringing the facing surface 712 directly into contact with the upper inner peripheral surface 123b of the opening 123.

  Moreover, although the support body 71 which supports the 1st earth board 61 demonstrated the example comprised with the metal block 710 in the above embodiment, you may be comprised with insulating materials, such as ceramics. In this case, as shown in FIG. 9B, the end portions 601 of the respective ground plates 61 are supported by the facing surface 712 of the support member 271, and the end portions of these ground plates 61 are opened directly or through the conductive sheet 714. A method of contacting the upper peripheral surface portion 123b of 123 can be adopted.

  In the above embodiment, the opening 123 is provided in one side wall 122a of the four side walls of the vacuum chamber 10, but the present invention is not limited to this, and at least one of the other side walls 122b to 122d is also provided. Similar openings may be provided. For example, the present invention can be applied to an in-line plasma processing apparatus having openings for carrying in / out a substrate on two opposite side walls. In this case, the same effect as described above can be obtained by installing the movable unit 70 configured as described above in each opening.

  10 to 12 are schematic sectional views showing modifications of the drive system for driving the support in the plasma processing apparatus. FIG. 10 shows a state when the substrate is carried in and out, FIG. 11 shows a state before the film formation after the substrate is carried in, and FIG. 12 shows a state when the film is formed.

  As shown in FIG. 10, also in the present embodiment, the opening 123 provided in the side wall 122 has a lower inner peripheral surface 123a (first inner peripheral surface) and an upper inner peripheral surface that opposes the lower inner peripheral surface 123a. Surface 123b (second inner peripheral surface). Further, in the present embodiment, in the inner wall 125 of the side wall 122, a portion connected to the lower inner peripheral surface 123a in the vicinity of the opening 123 is a lower inner wall 125a, and a portion connected to the upper inner peripheral surface 123b in the vicinity of the opening 123 is an upper inner wall 125b. To do.

  The support 81 supports the plurality of first ground plates 61. In the present embodiment, the support body 81 is supported by the support rod 83. The support bar 83 supports the bottom of the support 81.

  The support 81 faces the lower inner wall 125a (first inner wall) that is continuous with the lower inner peripheral surface 123a in the retracting portion V. In the present embodiment, the position of the support body 81 when the support body 81 faces the lower inner wall 125a is the first position. When the support body 81 is located in the first position, the support body 81 is not in contact with the lower inner wall 125a. When the support body 81 is located at the first position, for example, the stage 20 is located at the lowered position.

  The movable unit 80 that drives the support 81 includes a first drive unit 85, a second drive unit 86, an L-shaped arm 87, fixing members 88a and 89a, and shaft portions 88b and 89b. The first drive unit 85 and the second drive unit 86 are controlled by the controller 90.

  The first drive unit 85 includes a drive source 85a and a drive shaft 85b. The first drive unit 85 is installed outside (eg, below) the bottom 121 of the chamber body 12. The first drive unit 85 is typically composed of a fluid pressure cylinder such as an air cylinder or a hydraulic cylinder, but a ball screw mechanism may be employed.

  A shaft portion 89b is fixed to the drive source 85a by a fixing member 89a. The shaft portion 89b extends in the Y-axis direction. The drive shaft 85b can be expanded and contracted by the drive source 85a, for example, in the direction in which the support rod 83 extends. The front end of the drive shaft 85 b is connected to the lower end of the support bar 83. The central axis of the drive shaft 85 b coincides with the central axis of the support rod 83.

  The arm 87 includes an arm portion 87a and an arm portion 87b. The arm part 87a is orthogonal to the arm part 87b, for example. The end of the arm portion 87b is pivotally supported by the shaft portion 88b. As a result, the entire arm 87 can rotate around the shaft portion 88b. The shaft portion 88b is fixed to the bottom portion 121 by a fixing member 88a. The shaft portion 88b extends, for example, in the Y-axis direction. The arm portion 87a connected to the arm portion 87b is fixed to the drive source 85a on the opposite side to the shaft portion 89b. Thereby, the 1st drive part 85 becomes rotatable centering on the axial part 88b.

  When the support body 81 is located at the first position, the gap between the arm portion 87b and the bottom portion 121 gradually increases as the arm portion 87b moves away from the shaft portion 88b. That is, when the support body 81 is located at the first position, the direction in which the arm portion 87b extends intersects the horizontal direction. Thereby, when the support body 81 is located in the 1st position, the drive source 85a fixed to the arm part 87a is arrange | positioned diagonally with respect to a height direction (Z-axis direction). As a result, the drive shaft 85b connected to the drive source 85a is also arranged obliquely with respect to the height direction.

  The support rod 83 passes through the opening 124 provided in the bottom 121. The support bar 83 is inclined obliquely with respect to the height direction. The support rod 83 extends in the central axis direction of the drive shaft 85b. The opening width of the opening 124 is not particularly limited, and is set so that the inner peripheral surface of the opening 124 does not contact the support rod 83. For example, a part of the inner peripheral surface of the opening 124 is tapered according to the inclination angle of the support rod 83.

  A tube 84 is provided around the support rod 83. For example, the tube 84 surrounds the support bar 83 outside the bottom 121. The tube 84 is a tube such as a vacuum bellows or a flexible tube, and expands or contracts in the direction in which the drive shaft 85b expands or contracts. The tube 84 is connected to the opening 124 and connected to the tip of the drive shaft 85b. When the film forming chamber 11 is evacuated, the inside of the tube 84 is decompressed.

  The second drive unit 86 includes a drive source 86a and a drive shaft 86b. The second drive unit 86 is installed outside the bottom 121 of the chamber main body 12 (for example, next to the first drive unit 85), and typically includes a fluid pressure cylinder such as an air cylinder or a hydraulic cylinder. However, a ball screw mechanism may be employed.

  The drive shaft 86b can be expanded and contracted by a drive source 86a in a direction (X-axis direction) orthogonal to the direction in which the shaft portion 89b extends. The tip of the drive shaft 86b is pivotally supported by the shaft portion 89b. When the drive shaft 86b expands and contracts in the X-axis direction, the shaft portion 89b moves in the X-axis direction. As a result, the first drive unit 85 that fixes the shaft portion 89 b rotates about the shaft portion 88 b via the arm 87.

  A collecting member 127 is disposed on the upper inner peripheral surface 123 b of the opening 123. The collection member 127 protrudes from the opening 123 toward the film formation chamber 11. The collection member 127 is located directly below the upper inner wall 125b (second inner wall) that is continuous with the upper inner peripheral surface 123b of the opening 123. For example, when dust is generated directly above the collection member 127, foreign matter generated by the dust generation is collected on the collection member 127.

  FIG. 11 shows a state after the support 81 has moved from the first position to a position facing the upper inner wall 125b. That is, when the drive shaft 85b extends from the drive source 85a, the support body 81 moves from the first position to a position facing the upper inner wall 125b. In the present embodiment, the position of the support body 81 when the support body 81 faces the upper inner wall 125b is the third position. When the support body 81 is located at the third position, the support body 81 is not in contact with the upper inner wall 125b. Further, when the support body 81 is located at the third position, for example, the stage 20 is located at the raised position.

  In the present embodiment, when the support body 81 is moved up and down between the first position and the third position by the first driving unit 85, the support body 83 is arranged so that the support body 81 does not contact the collecting member 127. The inclination angle, the length of the collecting member 127 protruding into the film forming chamber 11, the size of the support 81, and the like are adjusted.

  FIG. 12 shows a state after the support 81 has moved from the third position to a position where it comes into contact with the upper inner wall 125b. Accordingly, the first ground plate 61 supported by the support body 81 is electrically connected to the upper inner wall 125b. For example, the drive shaft 86b of the second drive unit 86 extends from the drive source 86a, so that the first drive unit 85 pushed in the X-axis direction by the drive shaft 86b is centered on the shaft portion 88b via the arm 87. Rotate. As a result, the support rod 83 supported by the drive shaft 85b is inclined to the side opposite to the direction in which the first drive unit 85 is pushed by the drive shaft 86b, and the support 81 comes into contact with the upper inner wall 125b. The support bar 83 is substantially parallel to the height direction or is almost parallel. In the present embodiment, the position of the support body 81 when the support body 81 is electrically connected to the upper inner wall 125b is the second position.

  As described above, the movable unit 80 can move the support 81 between the first position and the third position, and moves the support 81 between the third position and the second position. Can be made. Thereby, the movable unit 80 can move the support body 81 between the first position and the second position.

  The driving by the first driving unit 85 and the driving by the second driving unit 86 may be performed simultaneously. In this case, the support body 81 moves so as to draw a gentle curve between the first position and the second position. However, the trajectory of the support 81 is controlled so that the support 81 does not come into contact with the collecting member 127 during the movement.

  FIG. 13 is a partially broken perspective view of a support used in a modification of the drive system.

  In the present embodiment, the support body 81 includes a rectangular parallelepiped metal block 810 having a long side in the Y-axis direction. Thereby, the contact area with respect to the upper inner wall 125b becomes large, and a substantially uniform contact can be achieved between the support 81 and the side wall 122 in the Y-axis direction. In the example of FIG. 13, the metal block 810 is supported by one support bar 83, but the present invention is not limited to this example. The metal block 810 may be supported by a plurality of support bars 83. In addition, the support body 81 may be divided into a plurality of parts in the width direction of the opening 123 and each may be configured to be movable up and down individually or in common.

  The metal block 810 is made of, for example, stainless steel or aluminum alloy. One side surface of the metal block 810 (side surface facing the peripheral edge of the stage 20) is a support surface 811 that supports the end portion 601 of each ground plate 61 in common, and the side surface of the metal block 810 opposite to the support surface 811. Is a facing surface 812 facing the upper inner wall 125b.

  The end portion 601 of each ground plate 61 is fixed to the support surface 811 so as to be in surface contact. As a result, the contact resistance between each ground plate 61 and the support 81 is reduced. The fixing method is not particularly limited, and mechanical fixing using a plurality of screws, welding, or the like can be employed.

  A conductive sheet 814 is fixed to the facing surface 812 via an elastic member 813. The elastic member 813 is disposed at the center of the facing surface 812 so as to protrude from the facing surface 812 to the conductive sheet 814 side by a predetermined height. The elastic member 813 is configured by a plate-like or shaft-like member that is long in the Y-axis direction, and its cross-sectional shape (cross-sectional shape parallel to the XZ plane) is formed in a rectangular shape or a dome shape that protrudes upward. The constituent material of the elastic member 813 is not particularly limited, and is typically made of rubber or elastomer.

  The conductive sheet 814 is formed of a metal sheet that is long in the Y-axis direction and is fixed to the center of the facing surface 812 so as to cover the elastic member 813. The conductive sheet 814 is made of a flexible metal plate, and the peripheral edge thereof is fixed to the opposing surface 812 via a plurality of fixing tools such as screws. The region where the conductive sheet 814 covers the elastic member 813 constitutes a contact portion 81A that contacts the upper inner wall 125b at the second position. The contact portion 81A is configured to be elastically deformable in the X-axis direction via an elastic member 813.

  The support body 81 further includes a seal ring 815 disposed around the contact portion 81A. The seal ring 815 is installed on the facing surface 812 so as to surround the conductive sheet 814. The seal ring 815 elastically contacts the upper inner wall 125b at the second position, thereby blocking the contact portion 81A from the film forming chamber 11. This prevents the process gas and its reaction product from adhering to the contact portion 81A.

  FIG. 14 is a partially broken perspective view of the collecting member.

  The collection member 127 is configured by a rectangular parallelepiped metal block having a long side in the Y-axis direction. When the support body 81 is in the second position, the support body 81 is positioned immediately above the collection surface 127a of the collection member 127. Thereby, the foreign material emitted when the support body 81 contacts the upper inner wall 125b is efficiently collected on the collection surface 127a.

  The collecting member 127 is made of, for example, stainless steel or aluminum alloy. The fixing method of the collection member 127 is not specifically limited, For example, the mechanical fixation using a some screw | thread is employable. Moreover, in the example of FIG. 13, the collection member 127 is installed on the upper inner peripheral surface 123b, but is not limited to this example. For example, the collection member 127 may be attached to the upper inner wall 125b.

  FIG. 15 is a partially broken perspective view of a modified example of the collecting member.

  Further, a concave portion 127 c may be formed on the upper surface side of the collecting member 127. With such a configuration, the foreign matter is more efficiently collected in the recess 127c.

  With the above configuration, in addition to shortening the return current path, the support body 81 moves from the first position to the second position via the third position. Thereby, the support body 81 does not contact the collection member 127, and dust generation resulting from the contact does not occur. Further, even if the contact portion 81A of the conductive sheet 814 comes into contact with the upper inner wall 125b and generates dust, the collecting member 127 disposed immediately below the portion where the support 81 is in contact with the upper inner wall 125b causes foreign matter ( For example, dust) is collected on the collecting member 127. This makes it difficult for foreign matter to adhere to the substrate W.

  16 to 18 are schematic cross-sectional views illustrating modifications of the plasma processing apparatus including the drive system according to the modification. FIG. 16 shows a state when the substrate is carried in and out, FIG. 17 shows a state before the film formation after the substrate is carried in, and FIG. 18 shows a state when the film is formed.

  As shown in FIG. 16, in the plasma processing apparatus including the movable unit 80, a recess 125 c is formed on the inner wall 125 of the side wall 122. The recess 125 c communicates with the opening 123. A step is formed between the inner wall 125 and the lower inner wall 125a, and a step is formed between the inner wall 125 and the upper inner wall 125b. That is, the lower inner wall 125a and the upper inner wall 125b are part of the bottom of the recess 125c.

  At least a part of the support 81 is accommodated in the recess 125c. The support 81 faces the lower inner wall 125a in the retracting portion V. This position is defined as a first position. When the support body 81 is located in the first position, the support body 81 is not in contact with the lower inner wall 125a. When the support body 81 is located at the first position, for example, the stage 20 is located at the lowered position.

  FIG. 17 shows a state after the support 81 has moved from the first position to a position facing the upper inner wall 125b. That is, when the drive shaft 85b extends from the drive source 85a, the support body 81 moves from the first position to a position facing the upper inner wall 125b. The position of the support 81 is defined as a third position. When the support body 81 is located at the third position, the support body 81 is not in contact with the upper inner wall 125b. Further, when the support body 81 is located at the third position, for example, the stage 20 is located at the raised position.

  FIG. 18 shows a state after the support 81 has moved from the third position to a position where it comes into contact with the upper inner wall 125b. The first ground plate 61 supported by the support 81 is electrically connected to the upper inner wall 125b. For example, the drive shaft 86b of the second drive unit 86 extends from the drive source 86a, so that the first drive unit 85 pushed in the X-axis direction by the drive shaft 86b is centered on the shaft portion 88b via the arm 87. Rotate. As a result, the support rod 83 supported by the drive shaft 85b is inclined to the side opposite to the direction in which the first drive unit 85 is pushed by the drive shaft 86b, and the support 81 comes into contact with the upper inner wall 125b. At least a part of the support 81 is accommodated in the recess 125c. The position of this support body 81 is defined as a second position.

  With such a configuration, the distance between the support 81 and the stage 20 and the distance between the support bar 83 and the stage 20 are further increased, and each of the support 81, the support bar 83, and the stage 20 is provided. Increased freedom of placement. Furthermore, it becomes easy to arrange other members between the support body 81 and the stage 20 or between the support bar 83 and the stage 20.

  Further, in the above embodiment, the plasma CVD apparatus has been described as an example of the plasma processing apparatus. However, the present invention is not limited to this, and the present invention can be applied to other plasma processing apparatuses such as a plasma etching apparatus and a plasma doping apparatus. is there.

DESCRIPTION OF SYMBOLS 10 ... Vacuum chamber 11 ... Film-forming chamber 12 ... Chamber main body 13 ... High frequency electrode 14 ... Insulating member 15 ... Shield cover 20 ... Stage 21 ... Support surface 22 ... Elevating shaft 23 ... Drive source 30 ... High frequency electrode 31 ... Electrode flange 32 ... Shower plate 41 ... Matching box 42 ... High frequency power supply 43 ... Gas introduction line 51 ... Door valve 60 ... Ground member 61 ... First earth plate 62 ... Second earth plate 70 ... Movable unit 71,171,271 ... Support 71A ... Contact part 72 ... Drive source 73 ... Drive shaft 80 ... Movable unit 81 ... Support body 81A ... Contact part 83 ... Support bar 84 ... Tube 85 ... First drive part 85a ... Drive source 85b ... Drive shaft 86 ... Second Drive portion 86a ... Drive source 86b ... Drive shaft 87 ... Arm 87a ... Arm portion 87b ... Arm portion 88a, 89a Fixed member 88b, 89b ... Shaft 90 ... Controller 121 ... Bottom 122 ... Side wall 122a ... Side wall 122b ... Side wall 123, 124 ... Opening 123a ... Lower inner peripheral surface 123b ... Upper inner peripheral surface 125 ... Inner wall 125a ... Lower inner wall 125b ... Upper inner wall 125c ... Recessed portion 127 ... Collection member 127a ... Collection surface 127c ... Recessed portion 171 ... Support body 271 ... Support body 311 ... Space portion 600 ... Flexible metal plate 601 ... End portion 602 ... End portion 710, 810 ... Metal blocks 711, 811 ... Support surfaces 712, 812 ... Confronting surfaces 713, 813 ... Elastic members 714,814 ... Conductive sheets 715,815 ... Seal ring 100 ... Plasma processing apparatus

Claims (10)

A chamber body having a side wall partially including an opening through which the substrate can pass;
A stage having a support surface capable of supporting the substrate; and a stage installed inside the chamber body;
A high-frequency electrode disposed opposite to the support surface and capable of generating plasma of a process gas;
A plurality of ground members arranged around the stage and electrically connecting the side wall and the stage;
A first support member that supports a first ground member that is a part of the plurality of ground members, wherein the first ground member faces the inner peripheral surface of the opening portion with the opening portion interposed therebetween; A movable unit capable of moving the support in an axial direction perpendicular to the support surface between a position and a second position at which the first ground member is electrically connected to the inner peripheral surface; A plasma processing apparatus comprising: The plasma processing apparatus according to claim 1,
The support has a conductive contact portion that contacts the inner peripheral surface at the second position, and the contact portion is configured to be elastically deformable in the axial direction. The plasma processing apparatus according to claim 2,
The support body further includes a seal ring that is disposed around the contact portion and elastically contacts the inner peripheral surface at the second position. Plasma processing apparatus. The plasma processing apparatus according to any one of claims 1 to 3,
The said support body is comprised with a metal block. Plasma processing apparatus. The plasma processing apparatus according to any one of claims 1 to 4,
The second position is substantially the same height as the height from the bottom of the chamber body at the connection position with the side wall of the second ground member which is another part of the plurality of ground members. Set plasma processing equipment. A plasma processing apparatus according to any one of claims 1 to 5,
The stage is configured to be movable along the axial direction,
The plurality of ground members are constituted by a plurality of flexible metal plates each having a first end connected to the side wall and a second end connected to the stage. The plasma processing apparatus according to any one of claims 1 to 6,
The support body has a rectangular parallelepiped shape extending along the longitudinal direction of the opening,
The first ground member includes a plurality of conductor portions arranged at intervals in the longitudinal direction. Plasma processing apparatus. A chamber main body having a side wall partially including an opening having a first inner peripheral surface through which a substrate can pass and a second inner peripheral surface facing the first inner peripheral surface;
A stage having a support surface capable of supporting the substrate; and a stage installed inside the chamber body;
A high-frequency electrode disposed opposite to the support surface and capable of generating plasma of a process gas;
A plurality of ground members arranged around the stage and electrically connecting the side wall and the stage;
A first support member that supports a first ground member that is a part of the plurality of ground members, wherein the support member faces a first inner wall of the side wall that is continuous with the first inner peripheral surface; A movable unit capable of moving the support body between a position and a second position where the support body is electrically connected to a second inner wall of the side wall that is continuous with the second inner peripheral surface; ,
A plasma processing apparatus, comprising: a collecting member disposed immediately below a portion where the support is in contact with the second inner wall. The plasma processing apparatus according to claim 8,
The movable unit includes a first drive unit that moves the support body between a third position facing the second inner wall and the first position, the third position, and the second position. A plasma processing apparatus, comprising: a second drive unit that moves the support body between positions. The plasma processing apparatus according to claim 8 or 9, wherein
A concave portion communicating with the opening is formed on the inner wall of the side wall,
The first inner wall and the second inner wall are part of the bottom of the recess. Plasma processing apparatus.

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