WO2011125704A9 - プラズマ処理装置及びプラズマ処理方法 - Google Patents
プラズマ処理装置及びプラズマ処理方法 Download PDFInfo
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- WO2011125704A9 WO2011125704A9 PCT/JP2011/057957 JP2011057957W WO2011125704A9 WO 2011125704 A9 WO2011125704 A9 WO 2011125704A9 JP 2011057957 W JP2011057957 W JP 2011057957W WO 2011125704 A9 WO2011125704 A9 WO 2011125704A9
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- Prior art keywords
- plasma processing
- dielectric plate
- processing apparatus
- spacer
- plasma
- Prior art date
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/16—Vessels; Containers
-
- 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
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3065—Plasma etching; Reactive-ion etching
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/50—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32192—Microwave generated discharge
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32192—Microwave generated discharge
- H01J37/32211—Means for coupling power to the plasma
- H01J37/3222—Antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/16—Vessels
- H01J2237/166—Sealing means
Definitions
- the present invention relates to a plasma processing apparatus and a plasma processing method.
- the sealing member is provided.
- a structure in which the support portion of the processing container and the top plate are brought into contact with each other so that there is no gap between them for example, Japanese Patent Application Laid-Open No. Hei 6- 112168.
- a resin layer and a liner are provided between the support portion and the top plate (see, for example, Japanese Patent Application Laid-Open Nos. 2004-134583 and 2009-253161).
- the support portion and the top plate in the processing container are directly contacted, or a resin layer or a liner is interposed between the support portion and the top plate in the processing container.
- the support and the top plate are thermally expanded by the heat of the plasma generated in the processing container. Due to the difference in thermal expansion coefficient between the support part and the top plate, and the elastic deformation of the resin layer and O-ring, the top plate and the support part may come into contact with each other and be rubbed or the top plate may be damaged. There was a problem of becoming.
- the present invention prevents the generation of particles due to damage to the dielectric plate or damage to the dielectric plate even if the dielectric plate is thermally expanded by plasma irradiation in the processing container.
- the present invention provides a plasma processing apparatus and a plasma processing method that can prevent as much as possible.
- the plasma processing apparatus of the present invention has a plasma processing space inside, a processing container having an open top, A dielectric plate covering the upper part of the plasma processing space; A lid member disposed on the processing vessel and having an annular support for supporting the outer periphery of the dielectric plate; A seal member provided between the support and the dielectric plate, for sealing the plasma processing space; A spacer provided on the outer peripheral side of the seal member and forming a gap between the support portion and the dielectric plate.
- the spacer may be provided intermittently on the outer peripheral side of the seal member.
- the spacer may be formed of a fluorine resin or a polyimide resin.
- the spacer may be a polyimide tape including a polyimide film layer and an adhesive layer.
- the adhesive layer of the spacer is stuck and fixed to the support portion.
- the plasma processing apparatus of the present invention may include a first seal member and a second seal member provided on the inner peripheral side of the first seal member as the seal member.
- the first seal member may be made of a fluorine-based resin.
- the second seal member may be made of a fluorine-based resin having higher plasma resistance than the first seal member.
- the seal member includes a first portion and a second portion provided on an inner peripheral side of the first portion, and the first portion
- the portion is made of a material having a higher vacuum sealing property than the second portion
- the second portion is made of a material having a higher plasma resistance than the first portion
- a gap between the upper surface of the support portion and the lower surface of the dielectric plate, which is formed by the spacer may be in a range of 0.05 to 0.4 mm. It is preferably in the range of 0.05 to 0.2 mm, and desirably in the range of 0.05 to 0.08 mm.
- the distance between the spacer and the seal member may be within a range of 1 to 10 mm.
- a gap in the range of 0.1 to 1 mm may be formed between the inner peripheral side wall of the support portion and the outer peripheral side wall of the dielectric plate.
- the dielectric plate may be positioned in the horizontal direction by the spacer.
- the plasma processing method of the present invention includes a processing container having a plasma processing space therein and having an open top, A dielectric plate covering the upper part of the plasma processing space; A lid member disposed on the processing vessel and having an annular support for supporting the outer periphery of the dielectric plate; A seal member provided between the support and the dielectric plate, for sealing the plasma processing space; A spacer provided on the outer peripheral side of the seal member, and forming a gap between the support portion and the dielectric plate;
- the object to be processed is subjected to plasma processing using a plasma processing apparatus including
- a plasma processing apparatus includes: A processing vessel having a plasma processing space inside and having an open top; A dielectric plate covering the upper part of the plasma processing space; A lid member disposed on the processing vessel and having an annular support for supporting the outer periphery of the dielectric plate; A seal member provided between the support and the dielectric plate, for sealing the plasma processing space; A spacer provided on the outer peripheral side of the seal member, and forming a gap between the support portion and the dielectric plate; An observation window for visually recognizing the inside of the processing container; It has.
- the said observation window is a transparent window member provided with the projection part inserted in the opening part for observation formed in the side wall of the said processing container, A fixing member for fixing the window member from the outside; A sealing member that hermetically seals between the side wall of the processing container and the window member around the observation opening; have. Further, the inner surface of the observation opening and the surface of the protrusion are formed so that the protrusion fits with a clearance within a range in which the protrusion can be inserted into the observation opening.
- the window member is mounted on the side wall of the processing container by inserting the protruding portion into the observation opening.
- the front end surface of the protruding portion is formed to be curved in accordance with the shape of the inner wall surface of the side wall of the processing container.
- the clearance between the surface of the protrusion and the inner surface of the observation opening is preferably in the range of 0.1 mm to 2 mm.
- the seal member for sealing the plasma processing space is provided between the support portion of the processing container and the dielectric plate, and the outer peripheral side of the seal member. Further, a spacer for forming a gap between the support portion and the dielectric plate is provided. For this reason, even if the support portion or the dielectric plate is thermally expanded by plasma irradiation in the processing container, a gap is formed between the support portion and the dielectric plate by the spacer, and the support portion and the dielectric plate are rubbed. Can be prevented. Further, it is possible to prevent the dielectric plate from being damaged or generating particles due to rubbing.
- FIG. 1 It is a schematic sectional drawing which shows the structural example of the plasma processing apparatus of one embodiment of this invention. It is drawing which shows the structure of a planar antenna. It is explanatory drawing which shows the structure of a control part. It is a fragmentary sectional view which expands and shows in detail the connection part of the dielectric material board in the plasma processing apparatus of 1st Embodiment, and the support part of a cover member. It is a fragmentary sectional view which removes the dielectric material board in the plasma processing apparatus of 1st Embodiment, and expands the end surface and upper surface of a cover member partially, and shows it in detail.
- FIG. 1 is a cross-sectional view schematically showing a schematic configuration of the plasma processing apparatus 100.
- 2 is a plan view showing a planar antenna of the plasma processing apparatus 100 of FIG. 1
- FIG. 3 is a diagram for explaining a configuration of a control system of the plasma processing apparatus 100. As shown in FIG.
- the plasma processing apparatus 100 introduces microwaves directly into a processing container using, for example, a planar antenna having a plurality of slot-shaped holes, in particular, a RLSA (Radial Line Slot Antenna) to generate plasma in the processing container. It is configured as an RLSA microwave plasma processing apparatus that can generate microwave-excited plasma with high density and low electron temperature by generating. In the plasma processing apparatus 100, processing with plasma having a plasma density of 1 ⁇ 10 10 to 5 ⁇ 10 12 / cm 3 and a low electron temperature of 0.7 to 2 eV is possible.
- the plasma processing apparatus 100 can be suitably used for the purpose of forming a silicon nitride film (SiN film) or a silicon oxide film by nitriding or oxidizing silicon, for example, in the manufacturing process of various semiconductor devices.
- the plasma processing apparatus 100 can be suitably used for the purpose of forming a CVD film or the like by plasma or plasma etching a silicon or silicon oxide film.
- the plasma processing apparatus 100 will be described by taking as an example a case where it is used for the purpose of performing a plasma nitriding process on an object to be processed.
- the plasma processing apparatus 100 has, as main components, a processing container 1 that houses a semiconductor wafer (hereinafter simply referred to as “wafer”) W as a substrate to be processed, and a wafer W placed in the processing container 1.
- a mounting table 2 a lid member 13 having a function of opening and closing the processing container 1 and supporting the dielectric plate, a gas introduction unit 15 connected to the gas supply device 18 and introducing gas into the processing container 1,
- a control unit 50 that controls each component of the plasma processing apparatus 100.
- the gas supply device 18 may be included in a constituent part of the plasma processing apparatus 100, or may be configured so as to be used by connecting an external gas supply device to the gas introduction unit 15 without being included in the constituent part.
- the processing container 1 is formed of a grounded substantially cylindrical container. Note that the processing container 1 may be formed of a rectangular tube-shaped container.
- the processing container 1 is open at the top and has a bottom wall 1a and a side wall 1b made of a material such as aluminum.
- a mounting table 2 is provided for horizontally mounting a wafer W, which is an object to be processed.
- the mounting table 2 is made of ceramics such as AlN and Al 2 O 3 , for example. Among them, a material having particularly high thermal conductivity such as AlN is preferably used.
- the mounting table 2 is supported by a cylindrical support member 3 extending upward from the center of the bottom of the exhaust chamber 11.
- the support member 3 is made of ceramics such as AlN, for example.
- the mounting table 2 is provided with a cover member 4 for covering the outer edge or the entire surface of the mounting table 2 and guiding the wafer W.
- the cover member 4 covers the upper surface, side surface, or entire surface of the mounting table 2.
- the cover member 4 may be formed in an annular shape.
- the cover member 4 can block the contact between the mounting table 2 and the plasma, prevent the mounting table 2 from being sputtered, and prevent impurities such as metals from entering the wafer W.
- the cover member 4 is made of a material such as quartz, single crystal silicon, polysilicon, amorphous silicon, or silicon nitride.
- the material constituting the cover member 4 is preferably a high-purity material with a low content of impurities such as alkali metals and metals.
- a resistance heating type heater 5 is embedded in the mounting table 2.
- the heater 5 is heated by the heater power supply 5a to heat the mounting table 2 and uniformly heats the wafer W, which is the object to be processed, with the heat.
- the mounting table 2 is provided with a thermocouple (TC) 6.
- TC thermocouple
- the heating temperature of the wafer W can be controlled in a range from room temperature to 900 ° C., for example.
- the mounting table 2 is provided with wafer support pins (not shown) used for delivering the wafer W when the wafer W is carried into the processing container 1.
- Each wafer support pin is provided so as to protrude and retract with respect to the surface of the mounting table 2.
- a cylindrical liner 7 made of quartz is provided on the inner wall surface of the processing container 1 so as to cover the inner wall surface.
- An annular baffle plate 8 made of quartz having a large number of exhaust holes 8 a is provided on the outer peripheral side of the mounting table 2 in order to realize uniform exhaust in the processing container 1.
- the baffle plate 8 is supported by a plurality of support columns 9.
- a circular opening 10 is formed at a substantially central portion of the bottom wall 1a of the processing container 1.
- An exhaust chamber 11 that communicates with the opening 10 and protrudes downward is provided on the bottom wall 1a.
- An exhaust pipe 12 is connected to the exhaust chamber 11, and the exhaust pipe 12 is connected to an exhaust device 24. In this way, the inside of the processing container 1 can be evacuated.
- the upper part of the processing container 1 is opened, and a lid member 13 having an opening / closing function is disposed at the upper end of the opened processing container 1.
- the lid member 13 has a frame shape with an open center, and the inner periphery thereof is provided with a step (two steps in FIG. 1) in an annular shape.
- the lid member 13 protrudes toward the inner side (inside the processing container space) by this step, and a ring-shaped (annular) support portion 13a is formed.
- the lid member 13 and the processing container 1 are hermetically sealed via a seal member 14.
- a loading / unloading port 16 for loading / unloading the wafer W between the plasma processing apparatus 100 and a transfer chamber (not shown) adjacent to the plasma processing apparatus 100 and a loading / unloading port 16 are provided on the side wall 1b of the processing container 1.
- a gate valve 17 that opens and closes is provided.
- annular gas introducing portion 15 is provided on the side wall 1b of the processing container 1. Gas discharge holes are evenly formed on the inner peripheral surface of the gas introduction portion 15.
- the gas introduction unit 15 is connected to a gas supply device 18 that supplies plasma excitation gas and nitrogen gas.
- the gas introduction part 15 may be provided in a nozzle shape or a shower shape.
- the gas supply device 18 includes a gas supply source, piping (for example, gas lines 20a, 20b, and 20c), a flow rate control device (for example, mass flow controllers 21a and 21b), and valves (for example, opening and closing valves 22a and 22b). have.
- a gas supply source for example, a rare gas supply source 19a and a nitrogen gas supply source 19b are provided as a configuration example when performing the nitriding process.
- the gas supply device 18 may have, for example, a purge gas supply source used when replacing the atmosphere in the processing container 1 as a gas supply source (not shown) other than the above. Note that when the plasma processing apparatus 100 is used for plasma oxidation, an oxygen gas supply source can be provided.
- the rare gas supplied from the rare gas supply source 19a for example, Ar gas, Kr gas, Xe gas, He gas, or the like can be used. Among these, it is particularly preferable to use Ar gas because it is economical.
- FIG. 1 representatively shows Ar gas.
- nitrogen gas (N 2 ) for example, ammonia gas (NH 3 ) can be supplied from the nitrogen gas supply source 19b.
- O 2 gas, O 3 gas, NO 2, etc. may be supplied from an oxygen gas supply source.
- the rare gas and the nitrogen gas are supplied from the rare gas supply source 19a and the nitrogen gas supply source 19b of the gas supply device 18 through the gas lines (piping) 20a and 20b, respectively, and merge in the gas line 20c. It introduce
- Each gas line 20a, 20b connected to each gas supply source is provided with a mass flow controller 21a, 21b and a set of on-off valves 22a, 22b arranged before and after the mass flow controller 21a, 21b. With such a configuration of the gas supply device 18, the supplied gas can be switched and the flow rate can be controlled.
- the exhaust device 24 includes a high-speed vacuum pump such as a turbo molecular pump. As described above, the exhaust device 24 is connected to the exhaust chamber 11 of the processing container 1 through the exhaust pipe 12. The gas in the processing container 1 flows uniformly into the space 11a of the exhaust chamber 11, and is further exhausted to the outside through the exhaust pipe 12 by operating the exhaust device 24 from the space 11a. Thereby, the inside of the processing container 1 can be depressurized at a high speed to a predetermined degree of vacuum, for example, 0.133 Pa.
- a predetermined degree of vacuum for example, 0.133 Pa.
- the microwave introducing device 27 includes, as main components, a dielectric plate 28 as a microwave transmission plate, a planar antenna 31, a slow wave material 33, a metal cover member 34, a waveguide 37, a matching circuit 38, and a microwave generator.
- a device 39 is provided.
- the microwave introducing device 27 is a plasma generating unit that generates plasma by introducing plasma (microwave) into the processing chamber 1.
- the dielectric plate 28 having a function of transmitting microwaves is disposed on the support portion 13 a protruding to the inner peripheral side of the lid member 13.
- the dielectric plate 28 is made of a material such as quartz or ceramic.
- the dielectric plate 28 and the support portion 13a of the lid member 13 are hermetically sealed through an O-ring 29a as a seal member. Therefore, the inside of the processing container 1 is kept airtight.
- a ring-shaped O-ring 29a is provided between the dielectric plate 28 and the support portion 13a of the lid member 13, and is not shown in FIG.
- a spacer 60 is provided (see FIG. 4).
- the planar antenna 31 is provided on the dielectric plate 28 (outside the processing container 1) so as to face the mounting table 2.
- the planar antenna 31 has a disk shape.
- the shape of the planar antenna 31 is not limited to a disk shape, and may be a square plate shape, for example.
- the planar antenna 31 is locked to the upper end of the lid member 13.
- the planar antenna 31 is made of a conductive member such as a copper plate, an aluminum plate, a nickel plate, or an alloy thereof whose surface is plated with gold or silver.
- the planar antenna 31 has a number of slot-shaped microwave radiation holes 32 that radiate microwaves.
- the microwave radiation holes 32 are formed through the planar antenna 31 in a predetermined pattern.
- the individual microwave radiation holes 32 have an elongated rectangular shape (slot shape), for example, as shown in FIG. And typically, the adjacent microwave radiation holes 32 are arranged in an “L” shape. Further, the microwave radiation holes 32 arranged in combination in a predetermined shape (for example, L-shape) are further arranged concentrically as a whole. The length and arrangement interval of the microwave radiation holes 32 are determined according to the wavelength ( ⁇ g) of the microwave. For example, the interval between the microwave radiation holes 32 is arranged to be ⁇ g / 4 to ⁇ g. In FIG. 2, the interval between adjacent microwave radiation holes 32 formed concentrically is indicated by ⁇ r. Note that the microwave radiation hole 32 may have another shape such as a circular shape or an arc shape. Furthermore, the arrangement form of the microwave radiation holes 32 is not particularly limited, and may be arranged in a spiral shape, a radial shape, or the like in addition to a concentric shape.
- a slow wave material 33 having a dielectric constant larger than that of a vacuum is provided on the upper surface of the planar antenna 31 (a flat waveguide formed between the planar antenna 31 and the metal cover member 34).
- the slow wave material 33 has a function of adjusting the plasma by shortening the wavelength of the microwave because the wavelength of the microwave becomes longer in vacuum.
- the material of the slow wave material 33 for example, quartz, polytetrafluoroethylene resin, polyimide resin or the like can be used.
- the planar antenna 31 and the dielectric plate 28 and the slow wave member 33 and the planar antenna 31 may be brought into contact with or separated from each other, but are preferably brought into contact with each other.
- a metal cover member 34 is provided on the upper portion of the processing container 1 so as to cover the planar antenna 31 and the slow wave material 33.
- the metal cover member 34 is made of a metal material such as aluminum or stainless steel.
- a flat waveguide is formed by the metal cover member 34 and the planar antenna 31 so that microwaves can be uniformly supplied into the processing container 1.
- the upper end of the lid member 13 and the metal cover member 34 are sealed by a seal member 35.
- a cooling water flow path 34 a is formed inside the wall of the metal cover member 34. By allowing the cooling water to flow through the cooling water flow path 34a, the metal cover member 34, the slow wave material 33, the planar antenna 31 and the dielectric plate 28 can be cooled.
- the planar antenna 31 and the metal cover member 34 are grounded.
- An opening 36 is formed in the center of the upper wall (ceiling part) of the metal cover member 34, and a waveguide 37 is connected to the opening 36.
- a microwave generator 39 that generates microwaves is connected to the other end of the waveguide 37 via a matching circuit 38.
- the waveguide 37 includes a coaxial waveguide 37a having a circular cross section extending upward from the opening 36 of the metal cover member 34, and an upper end portion of the coaxial waveguide 37a via a mode converter 40. And a rectangular waveguide 37b extending in the horizontal direction.
- the mode converter 40 has a function of converting the microwave propagating in the TE mode in the rectangular waveguide 37b into the TEM mode.
- An inner conductor 41 extends in the center of the coaxial waveguide 37a.
- the inner conductor 41 is connected and fixed to the center of the planar antenna 31 at its lower end. With such a structure, the microwave is efficiently and uniformly propagated radially and uniformly to the flat waveguide formed by the planar antenna 31 via the inner conductor 41 of the coaxial waveguide 37a.
- the microwave generated by the microwave generating device 39 is propagated to the planar antenna 31 through the waveguide 37, and is further dielectric from the microwave radiation hole 32 (slot). It is introduced into the processing container 1 through the plate 28.
- 2.45 GHz is preferably used as the frequency of the microwave, and 8.35 GHz, 1.98 GHz, or the like can also be used.
- Each component of the plasma processing apparatus 100 is connected to and controlled by the control unit 50.
- the control unit 50 is typically a computer, and includes, for example, a process controller 51 including a CPU, a user interface 52 connected to the process controller 51, and a storage unit 53 as shown in FIG. .
- the process controller 51 is a component related to processing conditions such as temperature, pressure, gas flow rate, and microwave output (for example, heater power supply 5a, gas supply device 18, exhaust device 24, microwave). This is a control means for controlling the generator 39 and the like in an integrated manner.
- the user interface 52 includes a keyboard on which a process manager manages command input to manage the plasma processing apparatus 100, a display for visualizing and displaying the operating status of the plasma processing apparatus 100, and the like.
- the storage unit 53 stores a control program (software) for realizing various processes executed by the plasma processing apparatus 100 under the control of the process controller 51, a recipe in which processing condition data, and the like are recorded. Yes.
- an arbitrary recipe is called from the storage unit 53 by an instruction from the user interface 52 and is executed by the process controller 51, so that the process of the plasma processing apparatus 100 is controlled under the control of the process controller 51.
- a desired process is performed in the container 1.
- the recipes such as the control program and processing condition data can be stored in a computer-readable storage medium such as a CD-ROM, hard disk, flexible disk, flash memory, DVD, or Blu-ray disk. Furthermore, it is possible to transmit the recipe from another apparatus, for example, via a dedicated line.
- damage-free plasma processing can be performed on the wafer W at a low temperature of, for example, room temperature (about 25 ° C.) to 600 ° C. Further, since the plasma processing apparatus 100 is excellent in plasma uniformity, process uniformity can be realized even for a large-diameter wafer W.
- the gate valve 17 is opened, and the wafer W is loaded into the processing container 1 from the loading / unloading port 16 and mounted on the mounting table 2.
- a microwave having a predetermined frequency, for example, 2.45 GHz, generated by the microwave generator 39 is guided to the waveguide 37 through the matching circuit 38.
- the microwave guided to the waveguide 37 sequentially passes through the rectangular waveguide 37 b and the coaxial waveguide 37 a and is supplied to the planar antenna 31 through the inner conductor 41. That is, the microwave propagates in the TE mode in the rectangular waveguide 37b, and the TE mode microwave is converted into the TEM mode by the mode converter 40, and the inside of the coaxial waveguide 37a is directed to the planar antenna 31. Will be propagated.
- the microwave is radiated into the space above the wafer W in the processing chamber 1 through the dielectric plate 28 from the slot-shaped microwave radiation hole 32 formed through the planar antenna 31.
- An electromagnetic field is formed in the processing container 1 by the microwave radiated from the planar antenna 31 through the dielectric plate 28 into the processing container 1, and the processing gas such as rare gas and nitrogen gas is turned into plasma.
- the microwave-excited plasma generated in this way has a high density of approximately 1 ⁇ 10 10 to 5 ⁇ 10 12 / cm 3 by radiating microwaves from the numerous microwave radiation holes 32 of the planar antenna 31. In the vicinity of the wafer W, low electron temperature plasma of about 1.2 eV or less is obtained.
- the conditions of the plasma nitriding process performed in the plasma processing apparatus 100 can be stored as a recipe in the storage unit 53 of the control unit 50. Then, the process controller 51 reads the recipe and sends a control signal to each component of the plasma processing apparatus 100, for example, the gas supply device 18, the exhaust device 24, the microwave generator 39, the heater power supply 5a, etc. Plasma nitriding treatment under the conditions is realized.
- FIG. 4 is a partial cross-sectional view showing in detail an A portion surrounded by a broken line in FIG. A portion indicates a connection portion between the dielectric plate 28 and the support portion 13 a of the lid member 13.
- FIG. 5 is a view showing in detail a partially enlarged upper surface of the support portion 13a of the lid member 13 with the dielectric plate 28 removed from the portion A surrounded by a broken line in FIG.
- a ring-shaped seal member is provided between the dielectric plate 28 and the support portion 13a of the lid member 13 as a seal member for sealing the plasma processing space in the processing container 1 and maintaining a vacuum state.
- the O-ring 29a is provided.
- a vertical gap d is formed on the outer peripheral side of the O-ring 29a between the upper surface of the support portion 13a of the lid member 13 at the top of the processing container 1 and the dielectric plate 28.
- a rectangular ring-shaped spacer 60 is provided. On the upper surface of the support portion 13a of the lid member 13, an O-ring 29a and a spacer 60 are respectively installed at predetermined attachment positions.
- Mounting grooves 131 and 132 having a predetermined depth are formed on the upper surface of the support portion 13a of the lid member 13 so as not to shift these installation positions.
- the O-ring 29a and the spacer 60 are fitted into the mounting grooves 131 and 132 by being press-fitted. Since the attachment grooves 131 and 132 are grooves (the dovetail grooves) having a narrow upper part and an expanded lower part, the O-ring 29a and the spacer 60 are difficult to be removed, and the attachment positions are not displaced.
- the spacer 60 has a function of forming a gap d between the upper surface of the support portion 13 a of the lid member 13 disposed on the upper portion of the processing container 1 and the dielectric plate 28.
- a gap d formed by the spacer 60 between the upper surface of the support portion 13a of the lid member 13 and the lower surface of the dielectric plate 28 is preferably 0.05 to 0.4 mm, for example.
- the gap d is more preferably 0.05 to 0.2 mm, and desirably 0.05 to 0.08 mm.
- the spacer 60 preferably has a small coefficient of friction so that the sliding of the contact surface with the dielectric plate 28 is improved when the lid member 13 and the dielectric plate 28 are thermally expanded by the heat of plasma.
- the spacer 60 is made of a material having a small dielectric loss tangent (tan ⁇ ), or the surface of the elastic member is coated with a material having a small tan ⁇ . It is preferable that Furthermore, the spacer 60 is preferably made of a material having a larger elastic modulus (Young's modulus) than the O-ring 29a.
- the Young's modulus of the spacer 60 is preferably in the range of 200 to 500 kgf / mm 2 .
- the tan ⁇ of the constituent material of the spacer 60 is preferably in the range of 0.00001 to 0.0034, for example.
- materials having tan ⁇ within the above range include fluorine resins such as polyimide resins and polytetrafluoroethylene.
- fluorine resins such as polyimide resins and polytetrafluoroethylene.
- a polyimide resin one having a Young's modulus in the range of 320 to 350 kgf / mm 2 is preferable.
- the support portion 13a of the lid member 13 is made of aluminum or the like, the thermal expansion coefficient is about 23 ⁇ 10 ⁇ 6 , whereas when the dielectric plate 28 is made of a quartz material, the thermal expansion coefficient is Is about 0.6 ⁇ 10 ⁇ 6 .
- the support portion 13 a of the lid member 13 has a higher coefficient of thermal expansion than the dielectric plate 28.
- the difference in thermal expansion coefficient between the lid member 13 and the dielectric plate 28 causes problems such as generation of particles due to rubbing and contact between the lid member 13 and the dielectric plate 28, damage to the dielectric plate 28, and the like.
- the gap d is preferably within the range of 0.05 to 0.4 mm, more preferably within the range of 0.05 to 0.2 mm, desirably 0.05 with the spacer 60. Such a problem can be prevented by forming within a range of 0.08 mm.
- the O-ring 29a formed of a fluorine resin material having a high vacuum sealability in order to seal the plasma processing space in the processing container 1 between the dielectric plate 28 and the support portion 13a of the lid member 13?
- the surface of the elastic material is coated with the fluorine resin material.
- the O-ring 29a is made of a material having a Shore A hardness of 60 to 80 from the viewpoint of securing a sufficient sealing property between the dielectric plate 28 and the support portion 13a of the lid member 13. preferable.
- the horizontal gap L1 formed between the inner peripheral wall surface 13c of the lid member 13 and the outer peripheral wall surface 28a of the dielectric plate 28 takes into account the thermal expansion of the dielectric plate 28.
- it is preferably within a range of 0.1 to 1 mm.
- the horizontal gap L1 may be almost zero (that is, in contact), but the dielectric plate 28 is the lid member 13. It is preferable to secure an interval that can easily fit in the support portion 13a.
- the distance L2 between the inner peripheral end of the spacer 60 and the outer peripheral end of the O-ring 29a is preferably in the range of 1 to 10 mm, for example, from the viewpoint of securing the strength of the support portion 13a.
- the spacer 60 may be arranged on the inner peripheral side (O-ring 29 a side) from the wall surface 28 a at the outer peripheral end of the dielectric plate 28.
- the O-ring 29a for sealing the plasma processing space in the processing container 1 is provided between the dielectric plate 28 and the support portion 13a of the lid member 13, and the O-ring 29a is further provided.
- a spacer 60 was provided on the outer peripheral side of the ring 29a.
- the gap d between the lid member 13 and the dielectric plate 28 is preferably in the range of 0.05 to 0.4 mm, more preferably in the range of 0.05 to 0.2 mm, and desirably 0. It is formed within a range of 0.05 to 0.08 mm.
- the plasma processing apparatus of the 2nd Embodiment of this invention is demonstrated.
- the difference between the plasma processing apparatus of the second embodiment and the plasma processing apparatus of the first embodiment is only the seal structure between the dielectric plate 28 and the support portion 13 a of the lid member 13. Therefore, the description of the same components as the plasma processing apparatus of the first embodiment is omitted, and only the seal structure characteristic to the plasma processing apparatus of the second embodiment will be described.
- FIG. 6 is an enlarged view of a connecting portion (that is, a portion corresponding to portion A in FIG. 1) between the dielectric plate 28 and the support portion 13a of the lid member 13 in the plasma processing apparatus of the second embodiment.
- FIG. FIG. 7 is a diagram showing in detail a partially enlarged view of the upper surface of the support portion 13a of the lid member 13 with the dielectric plate 28 removed in the plasma processing apparatus of the second embodiment.
- the plasma processing in the processing container 1 is performed between the dielectric plate 28 and the support portion 13a of the lid member 13.
- a ring-shaped O-ring 29a is provided as a first seal member for sealing the space.
- a spacer 60 is provided on the outer peripheral side of the O-ring 29 a in order to form a gap d between the support portion 13 a of the lid member 13 disposed on the upper portion of the processing container 1 and the dielectric plate 28.
- the spacer 60 is made of a material having a larger elastic modulus than the ring-shaped O-ring 29a.
- an O-ring 29b as a second seal member is provided on the inner peripheral side from the ring-shaped O-ring 29a. That is, an attachment groove 133 for attaching the O-ring 29b is formed on the inner peripheral side of the attachment groove 131 of the O-ring 29a on the upper surface of the support portion 13a of the lid member 13, and the O-ring 29b is pushed into the attachment groove 133. Fit and install. Since the attachment groove 133 is a groove (a dovetail groove) with a narrow upper portion and a lower lower portion, the O-ring 29b is difficult to come off.
- the distance L3 between the inner peripheral end of the O-ring 29a and the outer peripheral end of the O-ring 29b is preferably in the range of 1.5 to 50 mm, for example, from the viewpoint of securing the strength of the support portion 13a.
- the O-ring 29b is located on the inner peripheral side from the O-ring 29a and is easily subjected to plasma irradiation. Therefore, the O-ring 29b is made of a material such as a fluorine resin material having higher plasma resistance than the O-ring 29a, or the elastic member is coated with a material such as a fluorine resin material having higher plasma resistance than the O-ring 29a. It is preferable to configure. Further, since the vacuum sealing is performed by the O-ring 29a, the O-ring 29b may be made of a material having a lower vacuum sealing property than the O-ring 29a.
- the O-ring 29a is formed of fluorine rubber such as Viton (registered trademark) manufactured by DuPont having excellent vacuum sealability, and the like.
- the ring 29b is preferably formed of Kalrez (registered trademark) manufactured by DuPont, which has higher plasma resistance than the O-ring 29a, silicone, fluorine resin, or the like.
- an O-ring 29a having a high vacuum seal property is provided as the first seal member, and an O-ring structure having an inner and outer double O-ring 29b having a high plasma resistance as the second seal member is used.
- the O-ring 29b can prevent the O-ring 29a from being deteriorated by plasma. Therefore, the vacuum sealability in the processing container 1 by the O-ring 29a can be maintained for a long time. Further, since the maintenance time such as replacement of the consumable O-ring 29a can be extended, the operation period of the apparatus can be extended and productivity can be improved.
- the gap d is formed between the lid member 13 and the dielectric plate 28 by the spacer 60, as in the plasma processing apparatus 100 of the first embodiment. , Preferably in the range of 0.05 to 0.4 mm, more preferably in the range of 0.05 to 0.2 mm, and desirably in the range of 0.05 to 0.08 mm. Due to the gap d, even if the lid member 13 and the dielectric plate 28 are thermally expanded by the heat of plasma generated in the processing container 1 or the dielectric plate 28 is distorted downward by vacuum, the lid member 13 and the dielectric plate 28 It is possible to prevent the body plate 28 from coming into contact with and rubbing. Therefore, it is possible to prevent the dielectric plate 28 from being damaged or generating particles due to rubbing with the lid member 13.
- a double O-ring is composed of an O-ring 29a having a high vacuum sealing property as the first sealing member and an O-ring 29b having a high plasma resistance as the second sealing member.
- the spacer 60, the O-ring 29a as the first seal member, and the O-ring 29b as the second seal member are arranged from the outside to the inside (vacuum side). Deployed in this order. With this configuration, damage due to contact between the dielectric plate 28 and the lid member 13 and generation of particles can be prevented, and deterioration of the O-ring 29a can be prevented, and vacuum sealing performance can be ensured for a long period of time.
- FIG. 8 is a diagram showing in detail a partially enlarged view of the upper surface of the support portion 13a of the lid member 13 with the dielectric plate 28 removed in the plasma processing apparatus of the third embodiment.
- the plasma processing in the processing container 1 is performed between the dielectric plate 28 and the support portion 13a of the lid member 13.
- a ring-shaped O-ring 29a is provided as a first seal member for sealing the space.
- a plurality of spacers 60A are intermittently formed on the outer peripheral side of the O-ring 29a so as to form a gap d between the support portion 13a of the lid member 13 disposed on the processing container 1 and the dielectric plate 28.
- 60A,... therefore, the mounting grooves 132A, 132A,... Are intermittently arranged on the upper surface of the support portion 13a of the lid member 13 of the present embodiment so that a plurality of spacers 60A, 60A,. -Is formed.
- the spacer 60A is formed between the support portion 13a of the lid member 13 and the dielectric plate 28.
- a gap d (not shown in FIG. 8) is formed.
- the gap d is preferably in the range of 0.05 to 0.4 mm, more preferably in the range of 0.05 to 0.2 mm, and desirably in the range of 0.05 to 0.08 mm.
- a plurality of spacers 60A, 60A,... are intermittently provided on the outer peripheral side of the O-ring 29a. Therefore, the contact area between the plurality of spacers 60A, 60A,... And the dielectric plate 28 is reduced, and the generation of particles due to rubbing between the spacer 60A and the dielectric plate 28 can be reduced.
- a plurality of spacers 60A, 60A are intermittently provided on the outer peripheral side of the O-ring 29a. Can be provided.
- the spacers 60A are preferably arranged at two or more locations (for example, by dividing into two or more). Thereby, the spacer 60A can be disposed flat without distortion on the surface of the step portion of the support portion 13a. Since the gap between the dielectric plate 28 and the support portion 13a can be formed with high accuracy, there is no contact between the dielectric plate 28 and the support portion 13a and rubbing, and damage to the dielectric plate 28 and generation of particles can be prevented.
- a horizontal gap L1 is provided between the inner wall surface 13c of the lid member 13 and the outer wall surface 28a of the dielectric plate 28. did.
- This gap L1 is a play in consideration of the thermal expansion of the dielectric plate 28.
- the spacer 60 made of a material having a larger elastic modulus than the O-rings 29a and 29b is provided with a function of positioning the dielectric plate 28 in the horizontal direction.
- FIG. 10 is an enlarged view of a connecting portion (that is, a portion corresponding to portion A in FIG. 1) between the dielectric plate 28 and the support portion 13a of the lid member 13 in the plasma processing apparatus of the fourth embodiment.
- FIG. FIG. 11 is a diagram showing in detail a partially enlarged upper surface of the support portion 13a of the lid member 13 with the dielectric plate 28 removed in the plasma processing apparatus of the fourth embodiment.
- the spacer 60 ⁇ / b> B of the plasma processing apparatus according to the fourth embodiment has an L-shaped cross section for positioning the dielectric plate 28 in the horizontal direction. That is, the spacer 60B protrudes from the upper part on the outer peripheral side, and has a protrusion 60a.
- the dielectric plate 28 can be positioned in the horizontal direction by the protrusion 60a of the spacer 60B. That is, the dielectric plate 28 can be reliably installed at a predetermined horizontal position, and a horizontal gap is provided between the inner peripheral wall surface 13 c of the lid member 13 and the outer peripheral wall surface 28 a of the dielectric plate 28. L1 can be ensured reliably. Note that the height of the protrusion 60 a in the spacer 60 B can be arbitrarily set according to the thickness of the dielectric plate 28.
- the spacer 60B is formed between the support portion 13a of the lid member 13 and the dielectric plate 28.
- the gap d is preferably in the range of 0.05 to 0.4 mm, more preferably in the range of 0.05 to 0.2 mm, and desirably in the range of 0.05 to 0.08 mm.
- the spacer 60B in order to position the dielectric plate 28 in the horizontal direction, is formed in an L-shaped cross section, and a protruding portion 60a from which the upper part on the outer peripheral side protrudes is provided. Therefore, the dielectric plate 28 can be reliably installed at a predetermined horizontal position. Further, the protruding portion 60 a can ensure a horizontal gap L ⁇ b> 1 between the inner wall surface 13 c of the lid member 13 and the wall surface 28 a of the outer peripheral end of the dielectric plate 28.
- a dielectric plate 28A in which a notch 28b is formed at the peripheral edge of the lower surface can be used to facilitate horizontal positioning.
- the dielectric plate 28A can be reliably positioned and installed at a predetermined horizontal position.
- a horizontal gap L1 can be reliably ensured between the inner peripheral wall surface 13c of the lid member 13 and the outer peripheral wall surface 28a of the dielectric plate 28A.
- the spacer 60 itself may be a square or rectangular spacer 60 as in the first embodiment shown in FIG. 4 or the like, and the spacer 60 may be set to a large thickness.
- the shape of the spacer 60B shown in FIGS. 10 and 11 and the shape of the dielectric plate 28A shown in FIG. 12 are adopted, and at the same time, as shown in FIGS. A double O-ring structure with an O-ring 29b having high properties may be adopted.
- a plurality of spacers 60B may be provided intermittently instead of the spacer 60A.
- the spacer 60B can be disposed on the surface of the stepped portion of the support portion 13a without distortion. Since the gap between the dielectric plate 28 and the support portion 13a can be formed with high accuracy, there is no contact between the dielectric plate 28 and the support portion 13a and rubbing, and damage to the dielectric plate 28 and generation of particles can be prevented.
- the elastic modulus is greater than that of the O-rings 29a and 29b between the inner peripheral wall surface 13c of the lid member 13 and the outer peripheral wall surface 28a of the dielectric plate 28.
- a spacer 60, 60A or 60B made of a large material was provided.
- a polyimide tape having a polyimide resin and an adhesive layer is used as the spacer.
- FIG. 13 is an enlarged view of a connection portion between the dielectric plate 28 and the support portion 13a of the lid member 13 (that is, a portion corresponding to the portion A in FIG. 1) in the plasma processing apparatus of the fifth embodiment.
- FIG. FIG. 14 is a diagram showing in detail a partially enlarged view of the upper surface of the support portion 13a of the lid member 13 with the dielectric plate 28 removed in the plasma processing apparatus of the fifth embodiment.
- the spacer 60 ⁇ / b> C is configured by a plurality of arc-shaped polyimide tapes that are annular or are annular when combined.
- FIG. 15 shows an enlarged cross-sectional structure of a polyimide tape 70 that can be used as the spacer 60C.
- the polyimide tape 70 includes a polyimide film layer 70A and an adhesive layer 70B provided on one side of the polyimide film layer 70A.
- the glass transition temperature (Tg) is in the range of 120 ° C. to 250 ° C.
- the thermal expansion coefficient is in the range of 3 ⁇ 10 ⁇ 5 / ° C. to 5 ⁇ 10 ⁇ 5 / ° C.
- the material of the adhesive layer 70B is not particularly limited as long as it has adhesiveness to the metal surface.
- a heat-resistant silicone adhesive can be used.
- the thickness of the polyimide tape 70 (that is, the total thickness of the polyimide film layer 70A and the adhesive layer 70B) may be such that the gap d can be formed within the range of 0.05 to 0.4 mm as described above, for example. Therefore, the thickness of the polyimide tape 70 can be made extremely thin, for example, in the range of 35 ⁇ m or more and 400 ⁇ m or less.
- a commercially available product can be used as the polyimide tape 70 having such a structure, for example, Kapton tape (Kapton is a registered trademark) manufactured by Teraoka Seisakusho Co., Ltd. can be used.
- the use of the polyimide tape 70 having the adhesive layer 70B as the spacer 60C makes it difficult for the spacer 60C to be displaced. Therefore, the spacer 60 ⁇ / b> C can be attached without providing the attachment groove 132 in the support portion 13 a of the lid member 13. Therefore, it is possible to reduce the process required for processing the mounting groove and reduce the probability of occurrence of particles and metal contamination due to the mounting groove. Also in the present embodiment, if necessary, the same attachment groove 132 as in the first to fourth embodiments may be provided, and the spacer 60C may be provided there.
- the spacer 60C may be attached to either the lower surface of the dielectric plate 28 or the upper surface of the support portion 13a of the lid member 13. In order to suppress scratches and wear on the surface of the polyimide film layer 70A constituting the spacer 60C, it is preferable to attach the spacer 60C by bringing the adhesive layer 70B into contact with the upper surface of the support portion 13a.
- the spacer 60C is formed between the support portion 13a of the lid member 13 and the dielectric plate 28.
- the gap d is preferably in the range of 0.05 to 0.4 mm, more preferably in the range of 0.05 to 0.2 mm, and desirably in the range of 0.05 to 0.08 mm.
- the positional deviation hardly occurs, and the spacer is attached at a predetermined position without providing the mounting groove 132. Can be positioned. Therefore, the process of processing the mounting groove is not necessary.
- a double O-ring structure may be adopted as in the second embodiment. That is, as shown in FIGS. 16 and 17, the polyimide tape 70 as the spacer 60C, the O-ring 29a having a high vacuum sealability, and the O-ring 29b having a high plasma resistance are arranged from the outside to the inside (vacuum side). Can be deployed in this order. With such a configuration, damage due to contact between the dielectric plate 28 and the lid member 13 and generation of particles can be prevented, the O-ring 29a can be prevented from being deteriorated, and vacuum sealability can be secured for a long period of time.
- a plurality of polyimide tapes 70 as spacers 60C can be provided intermittently as in the configuration shown in FIGS. 8 and 9 of the third embodiment.
- the polyimide tape 70 is preferably affixed at two or more locations (divided into two or more).
- the polyimide tape 70 can be affixed at three locations (divided into three).
- the polyimide tape 70 can be affixed flat with no wrinkles on the surface of the support portion 13a. Since the gap d between the dielectric plate 28 and the support portion 13a can be formed with high accuracy, there is no contact and rubbing between the dielectric plate 28 and the support portion 13a, and damage to the dielectric plate 28 and generation of particles can be prevented.
- a material having a larger elastic modulus than the O-ring is formed between the inner peripheral wall surface 13 c of the lid member 13 and the outer peripheral wall surface 28 a of the dielectric plate 28.
- a polyimide tape 70 was used as the spacer 60C, and an O-ring 29a having a high vacuum sealing property and an O-ring 29b having a high plasma resistance were provided.
- an O-ring 80 having a portion made of a material having a high vacuum sealing property and a portion made of a material having a high plasma resistance is provided at one location.
- FIG. 18 is an enlarged view of a connecting portion (that is, a portion corresponding to portion A in FIG. 1) between the dielectric plate 28 and the support portion 13a of the lid member 13 in the plasma processing apparatus of the sixth embodiment.
- FIG. FIG. 19 is a diagram showing in detail a partially enlarged upper surface of the support portion 13a of the lid member 13 with the dielectric plate 28 removed in the plasma processing apparatus of the fifth embodiment.
- the O-ring 80 is configured by combining two different types of materials.
- a portion 80A that forms approximately half of the outer peripheral side of the O-ring 80 is formed of an elastic material having high vacuum sealability
- a portion 80B that forms approximately half of the inner peripheral side (vacuum side) is an elastic material having high plasma resistance. It is formed by.
- an elastic material having a high vacuum sealing property for example, fluorine rubber represented by Viton (registered trademark) can be exemplified.
- the elastic material having high plasma resistance include fluorine resins such as polytetrafluoroethylene.
- an O-ring is formed by using an inner and outer two-layer O-ring 80 having a portion 80A made of an elastic material having a high vacuum sealing property and a portion 80B made of an elastic material having a high plasma resistance as a sealing member. It is possible to prevent deterioration due to plasma and ensure vacuum sealability by deploying to one place without deploying to two places. Therefore, the number of parts can be reduced and the number of steps required for machining the mounting groove can be reduced from two to one.
- the support portion 13a of the lid member 13 and the spacer 60C made of a material having a larger elastic modulus than that of the O-ring.
- the gap d between the dielectric plate 28 and the dielectric plate 28 is preferably in the range of 0.05 to 0.4 mm, more preferably in the range of 0.05 to 0.2 mm, and desirably in the range of 0.05 to 0.08 mm. Is formed within.
- the support portion 13a of the lid member 13 and the dielectric plate 28 can be prevented from contacting and rubbing. Accordingly, it is possible to prevent the dielectric plate 28 from being damaged or generating particles due to rubbing.
- the polyimide tape 70 having the adhesive layer 70B as the spacer 60C it is difficult for the position shift to occur, and even if the mounting groove 132 is not provided, it can be placed at a predetermined position. Can be pasted and positioned. Therefore, the process for forming the spacer mounting groove is not required.
- the polyimide tape 70 as the spacer 60C, the portion 80A made of an elastic material having a high vacuum sealing property and the portion 80B made of an elastic material having a high plasma resistance in an O-ring 80 having an inner and outer two-layer structure, and an inner portion (vacuum) ) In this order.
- damage due to contact between the dielectric plate 28 and the lid member 13 and generation of particles can be prevented, deterioration of the O-ring can be prevented, and vacuum sealability can be ensured for a long period of time.
- a plurality of polyimide tapes 70 as spacers 60C can be intermittently provided in the same manner as the configuration shown in FIGS. 8 and 9 of the third embodiment.
- the polyimide tape 70 is preferably affixed at two or more locations (divided into two or more).
- the polyimide tape 70 can be affixed at three locations (divided into three).
- the polyimide tape 70 can be stuck flat on the surface of the stepped portion of the support portion 13a without wrinkles. Since the gap d between the dielectric plate 28 and the support portion 13a can be formed with high accuracy, there is no contact and rubbing between the dielectric plate 28 and the support portion 13a, and damage to the dielectric plate 28 and generation of particles can be prevented.
- the plasma processing apparatus of the present embodiment is different from the plasma processing apparatuses of the first to sixth embodiments in that it includes a viewport as an observation window for visually recognizing the inside of the processing container 1. ing.
- the plasma processing apparatus of the present embodiment has the characteristics of any of the plasma processing apparatuses of the first to sixth embodiments as they are.
- description of the same configuration as in the first to sixth embodiments is omitted, and characteristic parts of the plasma processing apparatus of the seventh embodiment will be described.
- FIG. 27 is a schematic cross-sectional view showing a configuration example of the plasma processing apparatus 101 of the present embodiment.
- the plasma processing apparatus 101 includes a viewport 200 for confirming the state of the plasma generation space S in the processing container 1 from the outside.
- FIG. 28 is an exploded perspective view showing the constituent members of the viewport 200 in the plasma processing apparatus of FIG. 27 in an enlarged manner.
- FIG. 29 is an enlarged cross-sectional view of the viewport 200 in the horizontal direction.
- An opening 201 as an observation opening is formed in the side wall 1b of the plasma processing apparatus 101 of the present embodiment.
- a protrusion 211 that is a part of the window member 210 is inserted into the opening 201.
- the window member 210 is fixed from the outside of the processing container 1 by a fixing plate 220 as a fixing member.
- the liner 7 is also provided with an opening at a position corresponding to the opening 201 of the side wall 1b.
- the window member 210 is made of a transparent material such as quartz.
- the window member 210 includes a protruding portion 211 inserted into the opening 201 of the processing container 1 and a base portion 213 that is integrated with the protruding portion 211 and is enlarged in a flange shape.
- the protruding portion 211 of the window member 210 protrudes in a direction orthogonal to the plate-like base portion 213.
- the front end surface 211a of the protrusion 211 is curved in an arc shape. The curvature of the distal end surface 211a, as shown in FIG.
- the protruding amount of the protruding portion 211 is determined in consideration of the thickness of the side wall 1 b of the processing container 1. Further, the shape (width and thickness) and size (volume) of the protruding portion 211 are precisely processed so as to substantially match the shape (width and height) and size (space volume) of the opening 201 of the side wall 1b. ing.
- the protrusion 211 and the inner surface of the opening 201 of the side wall 1b have a clearance within a range in which the protrusion 211 can be inserted into the opening 201, and have as little gap as possible. It is formed to fit.
- the clearance is a range in which plasma does not enter the opening 201, and is preferably in the range of 0.1 mm to 2 mm, and more preferably in the range of 0.5 mm to 1 mm.
- the plate-like fixing plate 220 is formed to be slightly larger than the base portion 213 of the window member 210, for example, with a metal such as aluminum or stainless steel.
- the fixing plate 220 has a recess 221 into which the base 213 of the window member 210 is fitted, and a through opening 223 provided in the recess 221.
- the fixing plate 220 presses and fixes the window member 210 to the side wall 1b of the processing container 1 from the outside so that the base 213 of the window member 210 is fitted into the recess 221.
- the fixing plate 220 is fixed to the side wall 1b at an arbitrary position, for example, by a screw. In FIG.
- the screw holes 225 formed at the four corners of the fixed plate 220 are drawn, but the position and number are not limited thereto.
- the size of the through-opening 223 is smaller than the base 213 of the window member 210 in order to secure a size that allows the inside of the processing container 1 to be visually recognized and to securely fix the window member 210. From the through opening 223, the inside of the processing container 1 can be visually recognized through the transparent window member 210.
- the fixing plate 220 the window member 210 is securely fixed to the processing container 1 and sealed so that the plasma does not leak outside the processing container 1.
- a groove 203 is formed on the side wall 1b of the processing container 1 so as to surround the opening 201.
- An O-ring 205 as a seal member is fitted in the groove 203.
- the window member 210 is pressed against the side wall 1b by the fixing plate 220 in a state in which the protruding portion 211 is inserted into the opening 201 of the side wall 1b. Therefore, the airtightness of the opening 201 is improved by the O-ring 205 around the opening 201. Kept.
- a flat window member made of quartz or the like is attached so as to cover the opening of the processing container 1 from the outside (atmosphere side) to form a viewport.
- an O-ring was disposed between the flat window member and sealed to maintain hermeticity.
- the plasma generated in the processing vessel enters the opening, and further easily wraps around to the position of the O-ring of the seal portion, damaging the O-ring and causing particles to be generated. There is a problem in that it occurs or the replacement life of the O-ring is shortened.
- the window member 210 includes the protruding portion 211, and the size of the protruding portion 211 substantially matches the size of the opening 201 of the side wall 1b. That is, the opening 201 and the protrusion 211 are fitted with little clearance and almost no gap. Therefore, it is possible to effectively prevent the plasma from flowing from the plasma generation space S in the processing container 1 to the position where the O-ring 205 outside the opening 201 is disposed. That is, the protruding portion 211 of the window member 210 has an effect of preventing plasma from entering the opening 201. Accordingly, it is possible to effectively prevent plasma from flowing into the seal portion through the opening 201, damage to the O-ring 205, deterioration, generation of particles, and early replacement time.
- the end face 211a of the projecting portion 211 is formed with the same curvature to match the curvature of the inner surface 1b IN sidewall 1b of the process vessel 1 having a cylindrical shape. With such a feature shape, while wearing the window member 210 to the side wall 1b, a step does not occur between the inner surface 1b IN and the window member 210 of the side wall 1b. As described above, since there is no level difference, it is possible to prevent influence on the plasma generated in the plasma generation space S in the processing chamber 1, for example, change in plasma density due to change in plasma diffusion or distribution. As a result, a uniform and stable plasma process can be performed on the object to be processed in the processing container 1.
- the generation of particles from the viewport 200 can be reduced. Then, by applying the configuration of the viewport 200 of the present embodiment to the plasma processing apparatuses of the first to sixth embodiments, the generation of particles in the processing container 1 can be more reliably and comprehensively performed. In addition, since a stable plasma can be generated and plasma treatment can be performed, a highly reliable semiconductor process can be realized. Other configurations and effects in the present embodiment are the same as those in the first to sixth embodiments.
- an evaluation apparatus is prepared that includes a metal block 90 that looks like the support portion 13a of the lid member 13 and a movable quartz plate 91 that looks like the dielectric plate. did. Then, a polyimide tape 70 having a thickness of 80 ⁇ m was attached to one of the block 90 and the quartz plate 91.
- a Kapton tape Kapton is a registered trademark manufactured by Teraoka Seisakusho Co., Ltd. was used.
- FIG. 20A shows a state in which the adhesive layer 70B of the polyimide tape 70 is attached to the block 90
- FIG. 20B shows a state in which the adhesive layer 70B of the polyimide tape 70 is attached to the quartz plate 91.
- the block 90 and the quartz plate 91 are brought close to each other and the polyimide tape 70 is pressed from both sides with a pressure corresponding to a surface pressure of 280000 N, and the quartz plate 91 is moved 6 mm in the left-right direction in FIGS. Moved back and forth 10,000 times.
- the surface roughness of the polyimide tape 70 was measured using the surface roughness measuring device (SJ301 by Mitutoyo Corporation).
- FIG. 21 shows the result when the adhesive layer 70B of the polyimide tape 70 is attached to the block 90
- FIG. 22 shows the case where the adhesive layer 70B of the polyimide tape 70 is attached to the quartz plate 91. From FIG. 21, it can be seen that when the adhesive layer 70B of the polyimide tape 70 is attached to the block 90, the thickness of the polyimide tape 70 hardly changes even after 60,000 reciprocations. Also in the measurement of the surface roughness, no scratches, surface roughness, or the like occurred on the surface of any of the polyimide tape 70, the block 90, and the quartz plate 91. On the other hand, from FIG.
- the film thickness of the polyimide tape 70 was reduced by about 10,000 reciprocations. Further, in the measurement of the surface roughness, rubbing scratches were confirmed on the surfaces of the polyimide tape 70 and the block 90, and there was concern about the generation of particles.
- the polyimide tape 70 used as the spacer 60C is attached to the support portion 13a of the lid member 13 rather than the dielectric plate 28. It was.
- the gap d between the dielectric plate 28 and the support portion 13a of the lid member 13 before and after the processing on 30,000 wafers W was measured.
- the gap d was 80.4 ⁇ m before the treatment and 80.9 ⁇ m after the treatment. Therefore, it was confirmed that the gap d between the dielectric plate 28 and the support portion 13a of the lid member 13 can be maintained substantially constant over a long period of time by interposing the polyimide tape 70.
- FIG. 23 shows the result of the uniformity of the nitrogen concentration between the wafers W. From this result, in the processing of 30,000 sheets, the nitrogen concentration is stably changing between about 0.2 to 0.4 [atom%], and the processing uniformity between the wafers W is recognized. It was.
- FIG. 24 shows the transition of the number of particles having a size of 0.12 ⁇ m or more measured with a particle counter. From this result, the number of detected particles was approximately 5 or less through 30,000 processes. Generation of particles due to rubbing between the polyimide tape 70 itself or the dielectric plate 28 and the support portion 13a of the lid member 13 was not recognized. In addition, although 10 or more particles are detected in the measurement result of the 15,000th sheet, it is considered that this is likely to be a measurement error.
- 25 and 26 show the results of contamination with Li, Na, Mg, Al, K, Ca, Ti, Cr, Mn, Fe, Ni, Co, Zn, and Cu. From this result, it was found that there is no correlation in which contamination increases as the number of processed sheets increases through the processing of 30,000 sheets. This is considered to be because the occurrence of contamination from the lid member 13 was suppressed as a result of the friction between the dielectric plate 28 and the support portion 13a of the lid member 13 being prevented by interposing the polyimide tape 70. It is done.
- the present invention is not limited to the above-described embodiments, and various modifications can be made.
- the RLSA type plasma processing apparatus 100 is used.
- other types of plasma processing apparatuses may be used.
- the plasma processing apparatus may be used.
- the plasma nitriding process using a semiconductor wafer as an object to be processed has been described as an example.
- the substrate as an object to be processed is, for example, a substrate for an FPD (flat panel display) or a solar cell.
- a substrate may be used.
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Abstract
Description
前記プラズマ処理空間の上部を塞ぐ誘電体板と、
前記処理容器の上部に配置されるとともに、前記誘電体板の外周部を支持する環状の支持部を有する蓋部材と、
前記支持部と前記誘電体板との間に設けられ、前記プラズマ処理空間を密閉するためのシール部材と、
前記シール部材の外周側に設けられ、前記支持部と前記誘電体板との間に隙間を形成するスペーサーと、を備えている。
前記プラズマ処理空間の上部を塞ぐ誘電体板と、
前記処理容器の上部に配置されるとともに、前記誘電体板の外周部を支持する環状の支持部を有する蓋部材と、
前記支持部と前記誘電体板との間に設けられ、前記プラズマ処理空間を密閉するためのシール部材と、
前記シール部材の外周側に設けられ、前記支持部と前記誘電体板との間に隙間を形成するスペーサーと、
を備えたプラズマ処理装置を用い、被処理体をプラズマ処理する。
内部にプラズマ処理空間を有し、上部が開口した処理容器と、
前記プラズマ処理空間の上部を塞ぐ誘電体板と、
前記処理容器の上部に配置されるとともに、前記誘電体板の外周部を支持する環状の支持部を有する蓋部材と、
前記支持部と前記誘電体板との間に設けられ、前記プラズマ処理空間を密閉するためのシール部材と、
前記シール部材の外周側に設けられ、前記支持部と前記誘電体板との間に隙間を形成するスペーサーと、
前記処理容器の内部を視認するための観察窓と、
を備えている。
そして、前記観察窓は、前記処理容器の側壁に形成された観察用開口部内に挿入される突出部を備えた透明な窓部材と、
前記窓部材を外部から固定する固定部材と、
前記観察用開口部の周囲において前記処理容器の側壁と前記窓部材との間を気密にシールするシール部材と、
を有している。
さらに、前記観察用開口部の内面と前記突出部の表面とは、該突出部が前記観察用開口部に挿入できる範囲内のクリアランスで隙間なく嵌り合うように形成されており、
前記突出部を前記観察用開口部に挿入することにより前記窓部材を前記処理容器の側壁に装着している。
この場合、前記突出部の先端面は、前記処理容器の側壁の内壁面の形状に合わせて湾曲して形成されていることが好ましい。
また、前記突出部の表面と前記観察用開口部の内面とのクリアランスは、0.1mm~2mmの範囲内であることが好ましい。
以下、本発明のプラズマ処理装置の実施の形態について図面を参照して詳細に説明する。まず、図1~3を参照しながら、本発明の第1の実施の形態にかかるプラズマ処理装置の構成について説明する。図1はプラズマ処理装置100の概略構成を模式的に示す断面図である。また、図2は、図1のプラズマ処理装置100の平面アンテナを示す平面図であり、図3はプラズマ処理装置100の制御系統の構成を説明する図面である。
次に、図6及び図7を参照し、本発明の第2の実施の形態のプラズマ処理装置について説明する。第2の実施の形態のプラズマ処理装置と第1の実施の形態のプラズマ処理装置との違いは、誘電体板28と、蓋部材13の支持部13aとの間のシール構造だけである。従って、第1の実施の形態のプラズマ処理装置と同一構成部分の説明は省略し、第2の実施の形態のプラズマ処理装置に特徴的なシール構造についてのみ説明する。
次に、第3の実施の形態のプラズマ処理装置について説明する。第1及び第2の実施の形態のプラズマ処理装置との違いは、誘電体板28と、蓋部材13の支持部13aとの間のスペーサーの構造だけなので、第1及び第2の実施の形態と同一構成部分の説明は省略し、第3の実施の形態のプラズマ処理装置に特徴的なスペーサーの構成についてのみ説明する。
次に、第4の実施の形態のプラズマ処理装置について説明する。第1~第3の実施の形態のプラズマ処理装置との違いは、誘電体板28と、蓋部材13の支持部13aとの間のスペーサーの構造だけなので、第1~第3の実施の形態と同一構成部分の説明は省略し、第4の実施の形態のプラズマ処理装置に特徴的なスペーサーの構成についてのみ説明する。
次に、第5の実施の形態のプラズマ処理装置について説明する。第1~第4の実施の形態のプラズマ処理装置との違いは、誘電体板28と、蓋部材13の支持部13aとの間のスペーサーの構造だけなので、第1~第4の実施の形態と同一構成部分の説明は省略し、第5の実施の形態のプラズマ処理装置に特徴的なスペーサーの構造についてのみ説明する。
次に、第6の実施の形態のプラズマ処理装置について説明する。第5の実施の形態のプラズマ処理装置との違いは、誘電体板28と、蓋部材13の支持部13aとの間のシール部材の構造だけなので、第1~第5の実施の形態と同一構成部分の説明は省略し、第6の実施の形態のプラズマ処理装置に特徴的なシール部材の構造についてのみ説明する。
次に、本発明の第7の実施の形態のプラズマ処理装置について説明する。本実施の形態のプラズマ処理装置は、処理容器1の内部を視認するための観察窓としてのビューポートを備えている点で、上記第1~第6の実施の形態のプラズマ処理装置と相違している。つまり、ビューポートを除けば、本実施の形態のプラズマ処理装置は、上記第1~第6の実施の形態のプラズマ処理装置のいずれかの特徴をそのまま備えている。以下、第1~第6の実施の形態と同じ構成の説明は省略し、第7の実施の形態のプラズマ処理装置の特徴的部分について説明する。
次に、第5及び第6の実施の形態のプラズマ処理装置で用いるポリイミドテープ70について、耐久性を評価した磨耗試験の結果について説明する。図20A及び図20Bに示したように、蓋部材13の支持部13aに見立てた金属製のブロック90と、誘電体板28に見立てた可動式の石英プレート91と、を備えた評価装置を準備した。そして、ブロック90又は石英プレート91のいずれか片方に、厚さ80μmのポリイミドテープ70を貼付した。なお、ポリイミドテープ70として、株式会社寺岡製作所製のカプトンテープ(カプトンは登録商標)を使用した。
次に、第5及び第6の実施の形態と同様の構成のプラズマ処理装置を用い、30,000枚のウエハWについて、プラズマ窒化処理を行ったランニング試験の結果について説明する。本ランニング試験では、ウエハW間の窒素濃度の均一性、パーティクル数、コンタミネーション、誘電体板と蓋部材の支持部との隙間について評価した。ウエハW表面のシリコンに対するプラズマ窒化処理の条件は、処理圧力;30Pa、Ar流量;660mL/min(sccm)、N2流量;200mL/min(sccm)、マイクロ波パワー;1950W、処理温度500℃、処理時間50秒で実施した。また、ポリイミドテープ70としては、株式会社寺岡製作所製のカプトンテープ(カプトンは登録商標;厚さ80μm)を使用した。
Claims (23)
- 内部にプラズマ処理空間を有し、上部が開口した処理容器と、
前記プラズマ処理空間の上部を塞ぐ誘電体板と、
前記処理容器の上部に配置されるとともに、前記誘電体板の外周部を支持する環状の支持部を有する蓋部材と、
前記支持部と前記誘電体板との間に設けられ、前記プラズマ処理空間を密閉するためのシール部材と、
前記シール部材の外周側に設けられ、前記支持部と前記誘電体板との間に隙間を形成するスペーサーと、
を備えたプラズマ処理装置。 - 前記スペーサーは、前記シール部材の外周側に、間欠的に設けられている、請求項1に記載のプラズマ処理装置。
- 前記スペーサーは、フッ素系樹脂又はポリイミド系樹脂から形成されている、請求項1に記載のプラズマ処理装置。
- 前記スペーサーは、ポリイミドフィルム層と粘着層とを備えたポリイミドテープである請求項1に記載のプラズマ処理装置。
- [規則91に基づく訂正 20.09.2011]
前記スペーサーの粘着層が、前記支持部に貼付けられて固定されている請求項4に記載のプラズマ処理装置。 - 前記シール部材として、第1のシール部材と、該第1のシール部材の内周側に設けられた第2のシール部材を含んでいる請求項1に記載のプラズマ処理装置。
- 前記第1のシール部材は、フッ素系樹脂から形成されている、請求項6に記載のプラズマ処理装置。
- 前記第2のシール部材は、前記第1のシール部材より耐プラズマ性が高いフッ素系樹脂から形成されている、請求項7に記載のプラズマ処理装置。
- 前記シール部材は、第1の部分と、該第1の部分の内周側に設けられた第2の部分と、を有しており、前記第1の部分は前記第2の部分よりも真空シール性が高い材質により構成され、前記第2の部分は前記第1の部分よりもプラズマ耐性が高い材質により構成されている請求項1に記載のプラズマ処理装置。
- 前記スペーサーにより形成される、前記支持部の上面と、前記誘電体板の下面との間の隙間は0.05~0.4mmの範囲内である、請求項9に記載のプラズマ処理装置。
- 前記スペーサーにより形成される、前記支持部の上面と、前記誘電体板の下面との間の隙間は0.05~0.2mmの範囲内である、請求項9に記載のプラズマ処理装置。
- 前記スペーサーにより形成される、前記支持部の上面と、前記誘電体板の下面との間の隙間は0.05~0.08mmの範囲内である、請求項9に記載のプラズマ処理装置。
- 前記スペーサーと、前記シール部材との間隔は、1~10mmの範囲内である、請求項1に記載のプラズマ処理装置。
- 前記蓋部材の内周の壁面と、前記誘電体板の外周側壁との間には、0.1~1mmの範囲内の隙間が形成されている、請求項1に記載のプラズマ処理装置。
- 前記スペーサーにより、前記誘電体板が水平方向に位置決めされている請求項14に記載のプラズマ処理装置。
- 内部にプラズマ処理空間を有し、上部が開口した処理容器と、
前記プラズマ処理空間の上部を塞ぐ誘電体板と、
前記処理容器の上部に配置されるとともに、前記誘電体板の外周部を支持する環状の支持部を有する蓋部材と、
前記支持部と前記誘電体板との間に設けられ、前記プラズマ処理空間を密閉するためのシール部材と、
前記シール部材の外周側に設けられ、前記支持部と前記誘電体板との間に隙間を形成するスペーサーと、
を備えたプラズマ処理装置を用い、被処理体をプラズマ処理するプラズマ処理方法。 - 前記シール部材は、第1の部分と、該第1の部分の内周側に設けられた第2の部分と、を有しており、前記第1の部分は前記第2の部分よりも真空シール性が高い材質により構成され、前記第2の部分は前記第1の部分よりもプラズマ耐性が高い材質により構成されている、請求項16に記載のプラズマ処理方法。
- 前記スペーサーにより形成される、前記支持部の上面と、前記誘電体板の下面との間の隙間は0.05~0.2mmの範囲内である、請求項16に記載のプラズマ処理方法。
- 前記スペーサーにより形成される、前記支持部の上面と、前記誘電体板の下面との間の隙間は0.05~0.08mmの範囲内である、請求項16に記載のプラズマ処理方法。
- 前記スペーサーと、前記シール部材との間隔は、1~10mmの範囲内である、請求項16に記載のプラズマ処理方法。
- 内部にプラズマ処理空間を有し、上部が開口した処理容器と、
前記プラズマ処理空間の上部を塞ぐ誘電体板と、
前記処理容器の上部に配置されるとともに、前記誘電体板の外周部を支持する環状の支持部を有する蓋部材と、
前記支持部と前記誘電体板との間に設けられ、前記プラズマ処理空間を密閉するためのシール部材と、
前記シール部材の外周側に設けられ、前記支持部と前記誘電体板との間に隙間を形成するスペーサーと、
前記処理容器の内部を視認するための観察窓と、
を備え、
前記観察窓は、前記処理容器の側壁に形成された観察用開口部内に挿入される突出部を備えた透明な窓部材と、
前記窓部材を外部から固定する固定部材と、
前記観察用開口部の周囲において前記処理容器の側壁と前記窓部材との間を気密にシールするシール部材と、
を有し、前記観察用開口部の内面と前記突出部の表面とは、該突出部が前記観察用開口部に挿入できる範囲内のクリアランスで隙間なく嵌り合うように形成されており、
前記突出部を前記観察用開口部に挿入することにより前記窓部材を前記処理容器の側壁に装着したプラズマ処理装置。 - 前記突出部の先端面は、前記処理容器の側壁の内壁面の形状に合わせて湾曲して形成されている請求項21に記載のプラズマ処理装置。
- 前記突出部の表面と前記観察用開口部の内面とのクリアランスは、0.1mm~2mmの範囲内である請求項21に記載のプラズマ処理装置。
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