WO2007108548A1 - 半導体加工装置用セラミック被覆部材の製造方法 - Google Patents
半導体加工装置用セラミック被覆部材の製造方法 Download PDFInfo
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- WO2007108548A1 WO2007108548A1 PCT/JP2007/056122 JP2007056122W WO2007108548A1 WO 2007108548 A1 WO2007108548 A1 WO 2007108548A1 JP 2007056122 W JP2007056122 W JP 2007056122W WO 2007108548 A1 WO2007108548 A1 WO 2007108548A1
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- semiconductor processing
- processing apparatus
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- ceramic
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- 238000012545 processing Methods 0.000 title claims abstract description 40
- 239000004065 semiconductor Substances 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 239000000919 ceramic Substances 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims description 37
- 238000010894 electron beam technology Methods 0.000 claims abstract description 31
- 238000005507 spraying Methods 0.000 claims abstract description 16
- 239000013078 crystal Substances 0.000 claims description 27
- 229910045601 alloy Inorganic materials 0.000 claims description 16
- 239000000956 alloy Substances 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 239000000758 substrate Substances 0.000 claims description 13
- 230000009466 transformation Effects 0.000 claims description 12
- 230000000737 periodic effect Effects 0.000 claims description 9
- 238000005524 ceramic coating Methods 0.000 claims description 8
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical group [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 150000001247 metal acetylides Chemical class 0.000 claims description 3
- 150000004767 nitrides Chemical class 0.000 claims description 3
- 238000001953 recrystallisation Methods 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- -1 borides Chemical class 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 230000001131 transforming effect Effects 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 24
- 238000001020 plasma etching Methods 0.000 abstract description 11
- 239000010410 layer Substances 0.000 description 89
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- 238000005260 corrosion Methods 0.000 description 24
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- 230000003628 erosive effect Effects 0.000 description 19
- 238000007750 plasma spraying Methods 0.000 description 18
- 230000000694 effects Effects 0.000 description 13
- 238000012360 testing method Methods 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 11
- 239000007921 spray Substances 0.000 description 11
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- 238000002844 melting Methods 0.000 description 9
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- 230000015572 biosynthetic process Effects 0.000 description 8
- 238000002441 X-ray diffraction Methods 0.000 description 7
- 229910052731 fluorine Inorganic materials 0.000 description 7
- 238000000151 deposition Methods 0.000 description 6
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- 238000005516 engineering process Methods 0.000 description 5
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- 239000011737 fluorine Substances 0.000 description 5
- 150000002739 metals Chemical class 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 4
- 238000005530 etching Methods 0.000 description 4
- 150000002222 fluorine compounds Chemical class 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000007747 plating Methods 0.000 description 4
- 239000010453 quartz Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 229910052736 halogen Inorganic materials 0.000 description 3
- 150000002367 halogens Chemical class 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 229910052747 lanthanoid Inorganic materials 0.000 description 3
- 150000002602 lanthanoids Chemical class 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052727 yttrium Inorganic materials 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
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- 239000010419 fine particle Substances 0.000 description 2
- 238000003682 fluorination reaction Methods 0.000 description 2
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- 150000002500 ions Chemical class 0.000 description 2
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- 230000003647 oxidation Effects 0.000 description 2
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 208000033999 Device damage Diseases 0.000 description 1
- 229910052693 Europium Inorganic materials 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000010407 anodic oxide Substances 0.000 description 1
- 238000002048 anodisation reaction Methods 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 150000002366 halogen compounds Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
-
- 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
- C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
-
- 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/04—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material
- C23C28/042—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material including a refractory ceramic layer, e.g. refractory metal oxides, ZrO2, rare earth oxides
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
- C23C4/11—Oxides
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/18—After-treatment
Definitions
- the present invention relates to a method for manufacturing a ceramic coating member for a semiconductor processing apparatus, and more particularly, a coating that exhibits high damage resistance to members, parts, and the like disposed in a semiconductor processing vessel for performing plasma etching processing and the like.
- a method of manufacturing a member is proposed.
- Plasma energy of highly corrosive, high-pressure corrosive gases For example, when forming a fine wiring pattern with a semiconductor processing device, plasma is generated in a highly corrosive gas atmosphere of fluorine or chlorine or a mixed gas atmosphere of these gases and an inert gas. This is a technology that uses a strong reaction of ions and electrons excited at that time to finely process (etch) semiconductor elements to form wiring patterns.
- the wall of the reaction vessel or the components (parts such as susceptors, electrostatic chucks, electrodes, etc.) disposed inside the reaction vessel are susceptible to erosion by plasma energy. Therefore, it is important to use a material with excellent plasma erosion resistance.
- inorganic materials such as metals with good corrosion resistance (including alloys), quartz, and alumina have been used as materials that meet these requirements. For example, these materials are coated on the surface of the reaction vessel member with a metal having good corrosion resistance by the PVD method or the CVD method, or a dense material such as an oxide of a group IIIa element in the periodic table.
- a technique for forming a film or coating a Y 2 O 3 single crystal is known (see Japanese Patent Application Laid-Open No. 10-400 8 3). Further, the Y 2 0 3 is Sani ⁇ of elements belonging to the periodic table III a group, by coating the surface of the member by a spraying method is also known technique for improving the resistance to plasma E Low Ji Yeon property '(See Japanese Patent Laid-Open No. 2 0 0 1-1 6 4 3 5 4). However, the method of coating corrosion-resistant metals and Group IIIa element oxides shows relatively good plasma erosion resistance, but with higher precision processing and environmental cleanliness in a more severe corrosive gas atmosphere. The current situation is that it is not a sufficient measure in the field of semiconductor processing technology in recent years.
- An object of the present invention is to propose a method of manufacturing a ceramic coating member used as a member or a part disposed in a semiconductor processing vessel used for performing plasma etching in a corrosive gas atmosphere.
- a porous layer is formed by spraying an oxide of a group IIIa element of the periodic table on the surface of a substrate, and this layer is subjected to high energy irradiation treatment on the surface of the porous layer.
- a preferred solution of the present invention is that an undercoat is previously formed between the substrate and the porous layer. Is to form.
- the undercoat is made of a metal such as Ni, Al, W, Mo, and Ti, or an alloy thereof, or a ceramic such as an oxide, nitride, boride, or carbide, and these and the metal.
- One or more types selected from alloy cermets are formed to a thickness of 5 0 to 50 0 ⁇ .
- the porosity force S is set to about 5 to 20% by thermal spraying, and the layer thickness is set to about 50 to 200 ⁇ m. It is preferable.
- the secondary recrystallization layer formed in the method of the present invention is formed by secondary transformation of the primary transformed oxide contained in the porous layer by high energy irradiation treatment.
- a porous layer composed of orthorhombic crystal structure formed by thermal spraying is transformed into a tetragonal crystal structure by secondary transformation by high-energy irradiation treatment, with a porosity of about 5%.
- the high energy irradiation treatment used in the present invention is preferably a treatment of either electron beam irradiation or laser beam irradiation.
- an atmosphere containing a halogen compound gas and an atmosphere containing z or a hydrocarbon-based gas in particular, a plasma erosion action in a corrosive environment in which these two atmospheres are alternately repeated.
- a ceramic covering member for a semiconductor processing apparatus that exhibits a strong resistance over a long period of time and has excellent durability.
- high-quality semiconductor elements and the like can be efficiently obtained without causing environmental pollution due to fine particles composed of constituent components of the film generated when plasma etching is performed in the corrosive environment. Can be produced easily.
- FIG. 1 is a sectional view (a) having a film formed by a method according to the prior art, a member (b) having a secondary recrystallized layer formed on the outermost layer by the method of the present invention, and a member having an undercoat It is a fragmentary sectional view of (c).
- Fig. 2 is an X-ray diffraction pattern of the secondary recrystallized layer produced when the sprayed coating (porous layer) is irradiated with an electron beam.
- FIG. 3 is an X-ray diffraction pattern of the Y 2 0 3 sprayed coating before the electron beam irradiation treatment.
- Fig. 4 is an X-ray diffraction pattern of the secondary recrystallized layer after the electron beam irradiation treatment.
- the present invention is a method for producing a ceramic coating member, a part, etc. for a semiconductor processing apparatus used in an environment where plasma etching is performed on a semiconductor element in a corrosive gas atmosphere.
- the environment in which this member is used is severely corrosive.
- this member is a gas containing fluorine or a fluorine compound (hereinafter referred to as “F-containing gas”).
- F-containing gas a gas containing fluorine or a fluorine compound
- An atmosphere containing a gas such as C 1 F 3 or HF, or a hydrocarbon gas such as C 2 H 2 or CH 4 hereinafter referred to as “containing CH gas”
- the F-containing gas atmosphere mainly contains fluorine or a fluorine compound, or may further contain oxygen (0 2 ).
- Fluorine is particularly reactive among halogen elements (strongly corrosive) and has the feature of reacting with oxides and carbides as well as metals to produce corrosion products with high vapor pressure. For this reason, the metal, oxide, carbide, etc. in the F-containing gas atmosphere do not generate a protective film for suppressing the progress of the corrosion reaction on the surface, and the corrosion reaction proceeds as much as possible.
- elements belonging to group a in the periodic table III that is, elements of Sc and Y, atomic number 57 to 71, and their oxides have relatively good corrosion resistance. Show.
- the CH-containing gas atmosphere has the characteristic that although the CH itself is not strongly corrosive, a reduction reaction that is completely opposite to the oxidation reaction that proceeds in the F-containing gas atmosphere occurs. For this reason, metals and metal compounds that exhibit relatively stable corrosion resistance in an F-containing gas atmosphere will then have a weaker chemical bonding force when in contact with the CH-containing gas atmosphere. Therefore, including CH When the part in contact with the soot is exposed again to the F-containing gas atmosphere, the initial stable compound film is chemically destroyed and eventually the corrosion reaction proceeds.
- the corrosion products generated in this way are vaporized in the plasma environment or become fine particles that significantly contaminate the plasma processing vessel. Therefore, in the present invention, it is particularly effective as a countermeasure against corrosion in an environment in which the F-containing gas / CH-containing atmosphere is repeated alternately, and not only prevents the generation of corrosion products but also suppresses the generation of particles. Also useful.
- the inventors first examined materials that exhibit good corrosion resistance and environmental pollution resistance even in an atmosphere of F-containing gas or CH-containing gas. As a result, the present inventors have concluded that it is effective to use an oxide of an element belonging to the group I I Ia of the periodic table as a material used by coating the surface of the substrate.
- S c, Y or lanthanoids with atomic numbers 5 7-71 (L a, C e, P r, N b, P m, S m, E u, G d, T b, D y, H o, E r, T m, Y b, L u), and for the lanthanides, rare earth oxides such as La, Ce, E u, D y, Y b are suitable. I found out. In the present invention, these oxides can be used singly or as a mixture of two or more, a double oxide, or a eutectic. In the present invention, the reason for paying attention to the metal oxide is that it is superior in halogen corrosion resistance and plasma erosion resistance as compared with other acid compounds.
- the base material is made of metal such as aluminum and its alloys, titanium and its alloys, stainless steel, other special steels, Ni-based alloys (hereinafter referred to as “metal” including alloys). ), Ceramics made of quartz, glass, oxides, carbides, borides, silicides, nitrides and mixtures thereof, inorganic materials such as cermets made of these ceramics and the above metals, plastics, etc. Can be used.
- a metal plating electric plating, fusion plating, chemical plating
- a metal vapor deposition film formed on the surface it is also possible to use a metal plating (electric plating, fusion plating, chemical plating) or a metal vapor deposition film formed on the surface.
- the features of the present invention are the following: It is to coat the Group IIIa element oxide of the Periodic Table showing excellent corrosion resistance, environmental pollution resistance, etc. in a corrosive environment. As a means for the covering, the present invention employs a method as described below.
- a thermal spraying method is used as a preferred example.
- the oxide of the Ilia group element is first made into a thermal spray material powder consisting of particles with a particle size of 5 to 80 m using powder soot, and this thermal spray material powder is applied to the surface of the substrate.
- Thermal spraying is performed to form a porous layer made of a porous sprayed coating having a thickness of 50 to 200 m.
- an air plasma spraying method, a low-pressure plasma spraying method, or a force water plasma spraying method or an explosion spraying method can be applied depending on use conditions.
- the thermal spray coating (porous layer) obtained by thermal spraying Group a element oxide powder is not sufficient as the coating under the corrosive environment if its thickness is less than 50 ⁇ m.
- the thickness of this layer exceeds 2 00 0 ⁇ ⁇ , the mutual bonding force of the spray particles becomes weaker, and the stress generated during film formation (volume shrinkage due to rapid cooling of the particles is the main factor). The film is likely to be destroyed.
- the porous layer (sprayed coating) is formed on the base material directly or after forming an undercoat in advance, and then forming a sprayed coating of the acid layer on the undercoat.
- the undercoat is formed by thermal spraying or vapor deposition, etc., Ni and its alloys, Co and its alloys, A1 and its alloys, Ti and its alloys, Mo and its alloys, W and its alloys, C
- a metallic film such as r and its alloys is preferred, and the film thickness is preferably about 50 to 50 Aim.
- this undercoat The role of this undercoat is to improve the adhesion between the base material and the porous layer while improving the corrosion resistance by shielding the base material surface from the corrosive environment. Therefore, if the thickness of this undercoat is less than 20 m, not only sufficient corrosion resistance cannot be obtained, but also uniform film formation is difficult. On the other hand, even if the film thickness is thicker than 500, the corrosion resistance effect is saturated. '
- the porous layer formed by a thermal spray coating made of an acid of an element belonging to Group IIIa has an average porosity of about 5 to 20%.
- This porosity depends on the type of thermal spraying method, For example, the power to be applied varies depending on the type of thermal spraying, such as reduced pressure plasma spraying or atmospheric plasma spraying.
- the range of the average porosity is preferably about 5 to 10%. If the porosity is less than 5%, the thermal stress accumulated in the film is weak and the thermal shock resistance is poor. On the other hand, if it exceeds 10%, especially 20%, the corrosion resistance and plasma erosion resistance are poor. Ten life is inferior.
- the surface of this porous (sprayed coating) has an average roughness (R a) of about 3-6 ⁇ ⁇ and a maximum roughness (R y) of 1 6-3 2 when atmospheric plasma spraying is applied. It has a roughness of about 8 to 24 m in terms of about 10 m and 10-point average roughness (R z).
- the reason why the porous layer is a thermal spray coating is that such a coating is excellent in thermal shock resistance and that a coating layer having a predetermined film thickness can be obtained in a short time and at low cost.
- such a film relaxes the thermal shock applied to the upper dense secondary recrystallized layer, and acts as a buffer to soften the thermal shock applied to the entire film.
- forming a composite coating with a thermal spray coating on the lower layer and a secondary recrystallized layer on the upper layer has the effect of improving the durability of the coating by acting synergistically. .
- what is characteristic is that, for example, an aspect in which the outermost layer portion of the sprayed coating is altered on the porous layer, that is, a porous sprayed coating made of an oxide of an Ilia group element.
- a new layer that is, a secondary recrystallized layer obtained by secondary transformation of the porous layer made of the oxide of the group IIIa element is formed.
- the crystal structure is a cubic crystal belonging to the tetragonal system.
- yttria powder of yttrium oxide
- the molten particles collide with the surface of the substrate and deposit while being rapidly cooled while flying at high speed toward the substrate.
- the crystal structure undergoes a primary transformation to a crystal form consisting of a mixed crystal including monoclinic (monoc 1 inic) in addition to cubic (cubic).
- the crystal type of the porous layer is composed of a crystal type composed of a mixed crystal including orthorhombic and tetragonal systems by undergoing a primary transformation by being super-cooled during spraying.
- the secondary recrystallized layer is a layer in which the crystal form of the mixed crystal that has undergone primary transformation is secondarily transformed into a tetragonal crystal form.
- a mixed crystal structure mainly containing orthorhombic crystals transformed primarily.
- the porous layer of the group IIIa oxide consisting of III By subjecting the porous layer of the group IIIa oxide consisting of III to a high energy irradiation treatment, the deposited sprayed particles of the porous layer are heated to at least the melting point or more to transform the layer again ( Secondary transformation), the crystal structure is returned to a tetragonal structure and crystallographically stabilized.
- the thermal strain and mechanical strain accumulated in the thermal spray particle deposition layer are released, and the properties are stabilized physically and chemically, and accompanied by melting.
- the densification and smoothing of this layer is also realized.
- the secondary recrystallized layer made of this I I Ia group metal oxide becomes a dense and smooth layer as compared with the layer as sprayed.
- this secondary recrystallized layer becomes a densified layer having a porosity of less than 5%, preferably less than 2%, and the surface has an average roughness (Ra) of 0.8 to 3.0 m. , it becomes about 3 ⁇ 14 ⁇ ⁇ at the maximum roughness (Ry) at 6 to 1 6 ⁇ 111, 1 0-point average roughness (R z), becomes remarkably different layers in comparison with the porous layer.
- This maximum roughness (Ry) control is determined from the viewpoint of environmental pollution resistance. The reason for this is that when the surface of the container member is scraped off by the plasma ions and electrons excited in the etching atmosphere and particles are generated, the effect is the value of the maximum surface roughness (Ry). It appears well, and if this value is large, the chance of particle generation increases.
- the method employed in the present invention is preferably an electron beam irradiation process or a laser irradiation process such as C0 2 YAG.
- E-Beam Irradiation Treatment As a condition for this treatment, it is recommended to introduce an inert gas such as Ar gas into the irradiation chamber where the air is exhausted, for example, under the following conditions:
- the oxide of III-group element that has been subjected to electron beam irradiation is heated from the surface. It rises and finally reaches the melting point or higher and enters a molten state.
- This melting phenomenon gradually reaches the inside of the film by increasing the electron beam irradiation output, increasing the number of times of irradiation, and increasing the irradiation time. It can be controlled by changing the irradiation conditions. If it has a melting depth of l OO / zm or less, and practically 1 ⁇ m to 50 / im, a secondary recrystallized layer suitable for the above object of the present invention is obtained.
- the layer subjected to the electron beam irradiation treatment or the laser beam irradiation treatment is transformed into a crystal form which is transformed into a physicochemically stable crystal by transforming to a high temperature and precipitating secondary recrystallization upon cooling. Modification proceeds in units of crystal level.
- the Y 2 ⁇ 3 film have been conducted under the form to the atmosphere plasma spraying process, as described above, while a mixed crystal comprising orthorhombic at spraying conditions, most changes to a cubic after electron beam irradiation.
- the secondary recrystallized layer produced by the high energy irradiation treatment is obtained by further secondary transformation of the porous layer made of the lower metal oxide or the lower oxide particles are heated to the melting point or higher. Therefore, at least a part of the pores disappear and become dense.
- the secondary recrystallized layer produced by the high energy irradiation treatment is a layer obtained by further secondary transformation of a porous layer made of a metal oxide that seems to be the primary transformation of the lower layer.
- a thermal spray coating formed by thermal spraying the unmelted particles at the time of thermal spraying are completely melted and the surface is in a mirror state, so that the laser beam is easily etched and the projections disappear.
- the maximum roughness (R y) is 16 to 3 2 m
- the maximum roughness (R y) of the secondary recrystallized layer after this treatment is 6 to 16 / m is a very smooth layer, which is a cause of contamination during plasma etching. Generation of particles is suppressed.
- the porous layer is closed by through pores due to the secondary recrystallized layer produced by the high energy irradiation treatment, and the inside (through the through pores (
- the corrosion resistance of the base material is improved by eliminating the corrosive gas that enters the base material), and because it is densified, it exerts a strong resistance to the plasma etching action and has excellent corrosion resistance and resistance over a long period of time. Demonstrates plasma erosion.
- this porous layer Since it has a porous layer under the secondary recrystallized layer, this porous layer functions as a layer having excellent heat resistance and also acts as a buffer region, and the upper layer is densified.
- the effect is composite and synergistic.
- the secondary recrystallized layer produced by the high energy irradiation treatment is preferably a layer having a thickness of 1 Aim to 50 m from the surface. The reason is that if the thickness is less than 1 ⁇ m, there is no effect of film formation, while if it exceeds 50 ⁇ m, the burden of high energy irradiation treatment becomes large and the effect of film formation is saturated.
- This test investigated the state of film formation by thermal spraying with Group IIIa element oxides and the state of the layers formed when the obtained film was irradiated with an electron beam and a laser beam. is there.
- group IIIa oxides for testing: S c 2 0 3 , Y 2 0 3 , L a 2 0 3 , C e 0 2 , E u 2 0 3 and Y b 2 0 3 No. 1 acid powder (average particle size: 10 to 50 / zm) was used. Then, these powders are directly subjected to atmospheric plasma spraying (AP S) and low pressure plasma spraying (LP PS) on one side of an aluminum test piece (width: 5 OmmX length 6 OmmX thickness 8mm). Then, a sprayed coating with a thickness of 100 ⁇ m was formed. After that, the surface of these films was subjected to electron beam irradiation treatment and laser beam irradiation treatment. Table 1 summarizes the results of this study.
- the test oxide melts sufficiently well even with a gas plasma heat source, as shown in Table 1 melting point (2300 to 2600 ° C). Despite the existence of unique pores, the film was found to be relatively good. In addition, it was confirmed that the protrusions disappeared due to the melting phenomenon in these film surfaces irradiated with an electron beam and a laser beam and changed to a dense and smooth surface as a whole.
- FIG. 2 shows the results and shows the XRD pattern before the electron beam irradiation treatment.
- FIG. 3 is an X-ray diffraction chart in which the vertical axis before processing is enlarged
- FIG. 4 is an X-ray diffraction chart in which the vertical axis after processing is enlarged.
- Fig. 3 in the sample before processing, the monoclinic peak was observed in the range of 30 ° to 35 °, indicating that the cubic and monoclinic crystals are mixed.
- Fig. 3 shows that the monoclinic peak was observed in the range of 30 ° to 35 °, indicating that the cubic and monoclinic crystals are mixed.
- symbol 1 shown in FIG. 1 is a base material
- 2 is a porous layer (sprayed particle deposition layer)
- 3 is a pore (void)
- 4 is a particle interface
- 5 is a through-hole
- 6 is produced by electron beam irradiation processing
- 7 is the undercoat.
- an undercoat of 8 O mass% N i -2 O mass% Cr was applied to the surface of an A 1 substrate (dimensions: 5 O mm X 5 O mm X 5 m) by atmospheric plasma spraying.
- Thermal spray coating was applied, and Y 2 0 3 and Ce 0 2 powders were used on it to form a porous coating by atmospheric plasma spraying.
- the surface of these thermal spray coatings was subjected to two types of high-energy irradiation treatment, electron beam irradiation and laser beam irradiation.
- the surface of the specimen thus obtained was subjected to plasma etching under the following conditions.
- the main components of the particles adhering to the silicon wafer surface were Y (Ce), F, and C as they were by thermal spraying, but this film was irradiated with an electron beam or laser beam (secondary). In the case of the recrystallized layer), almost no film components were observed in the generated partition, and F and C were observed.
- Thermal spraying is performed by atmospheric plasma spraying, and the film thickness of the undercoat (80Ni—20Cr) is 80 ⁇ ⁇ ,
- Topcoat oxide is 150 ⁇ m
- a film was formed by spraying a film forming material as shown in Table 3 on the surface of a substrate made of A 1 having a thickness of 5 OmmX 10 OmmX 5 mm. Thereafter, an electron beam irradiation treatment was performed on a part of the film to form a secondary recrystallized layer suitable for the present invention. Next, after cutting out a test piece with dimensions 2 OmmX 2 OmmX 5 mm from the obtained specimen, the other part was masked so that the range of 1 OmmX 10 mm of the irradiated film surface was exposed, Plasma irradiation was performed under the conditions shown below, and the amount of damage caused by plasma erosion was determined using an electron microscope or the like.
- Table 3 summarizes the above results. As is apparent from the results shown in this table, the anodic oxide coating (No. 8), B 4 C sprayed coating (No. 9), and quartz (untreated No. 10)) of the comparative examples are all produced by plasma erosion. The amount of wear was large and found to be impractical.
- the coating (No. 1-7) having the secondary recrystallized layer as the outermost layer uses a group IIIa element as a film forming material, so that even if it is still sprayed, it has a certain degree of anti-erosion resistance.
- this film was further processed by electron beam irradiation, the resistance was further improved and the plasma erosion damage was reduced by 10-30%.
- a film was formed by the method of Example 2, and the plasma erosion resistance of the formed film before and after the electron beam irradiation treatment was investigated.
- a mixed oxide as shown below was directly formed on an A 1 substrate to a thickness of 200 / im by an atmospheric plasma spraying method.
- Electron beam irradiation after deposition, gas atmosphere components, plasma spraying conditions, etc. are the same as in Example 2.
- Table 4 summarizes the above results as plasma erosion damage.
- the oxide films in Group IIIa of the Periodic Table III under the conditions suitable for the present invention are shown in Table 3 even when these oxides are used in a mixed state.
- the plasma erosion resistance is better than the A 1 2 0 3 (anodic oxidation) and B 4 C coatings of the disclosed comparative example, especially when the coating is subjected to electron beam irradiation treatment. And improved plasma erosion resistance.
- the number in the film deposition material column indicates ma S s%
- the technique of the present invention is used as a surface treatment technique for members for plasma processing apparatuses, which are required not only for members and parts used in general semiconductor processing apparatuses but also for recent and more precise and advanced processing.
- the present invention relates to a deposition shield for a semiconductor processing apparatus that performs plasma processing in a harsh atmosphere in which an F-containing gas and a CH-containing gas are used independently or in which these gases are used alternately and repeatedly. It is suitable as a surface treatment technology for members and parts such as baffle plate, focus ring, upper 'lower insulator ring, sheathed ring, bellows cover, electrode, solid dielectric.
- the present invention also provides a surface of a liquid crystal device manufacturing apparatus member. Applicable as processing technology
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Abstract
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- 2007-03-16 KR KR1020087023718A patent/KR20080102254A/ko not_active Application Discontinuation
- 2007-03-16 WO PCT/JP2007/056122 patent/WO2007108548A1/ja active Application Filing
- 2007-03-16 US US12/293,974 patent/US20090208667A1/en not_active Abandoned
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US20090183835A1 (en) * | 2008-01-22 | 2009-07-23 | Muneo Furuse | Etching process apparatus and member for etching process chamber |
JP2013147679A (ja) * | 2012-01-17 | 2013-08-01 | Tocalo Co Ltd | フッ化物溶射皮膜被覆部材およびその製造方法 |
US20160254125A1 (en) * | 2015-02-27 | 2016-09-01 | Lam Research Corporation | Method for coating surfaces |
Also Published As
Publication number | Publication date |
---|---|
US20090208667A1 (en) | 2009-08-20 |
JP4643478B2 (ja) | 2011-03-02 |
JP2007247043A (ja) | 2007-09-27 |
KR20080102254A (ko) | 2008-11-24 |
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