WO2023013211A1 - ウエハ支持体 - Google Patents
ウエハ支持体 Download PDFInfo
- Publication number
- WO2023013211A1 WO2023013211A1 PCT/JP2022/021407 JP2022021407W WO2023013211A1 WO 2023013211 A1 WO2023013211 A1 WO 2023013211A1 JP 2022021407 W JP2022021407 W JP 2022021407W WO 2023013211 A1 WO2023013211 A1 WO 2023013211A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- protective layer
- wafer support
- mass
- base material
- nitride
- Prior art date
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- 239000000463 material Substances 0.000 claims abstract description 70
- 239000011241 protective layer Substances 0.000 claims abstract description 68
- 239000000919 ceramic Substances 0.000 claims abstract description 63
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 37
- 229910052582 BN Inorganic materials 0.000 claims description 36
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical group Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 26
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 20
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 20
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 16
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 15
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 14
- 238000005245 sintering Methods 0.000 claims description 14
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 12
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 12
- 239000000395 magnesium oxide Substances 0.000 claims description 10
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 10
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims description 8
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 6
- 229910019655 synthetic inorganic crystalline material Inorganic materials 0.000 claims description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- PSNPEOOEWZZFPJ-UHFFFAOYSA-N alumane;yttrium Chemical compound [AlH3].[Y] PSNPEOOEWZZFPJ-UHFFFAOYSA-N 0.000 claims description 3
- JNDMLEXHDPKVFC-UHFFFAOYSA-N aluminum;oxygen(2-);yttrium(3+) Chemical compound [O-2].[O-2].[O-2].[Al+3].[Y+3] JNDMLEXHDPKVFC-UHFFFAOYSA-N 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 239000011733 molybdenum Substances 0.000 claims description 3
- 229910052715 tantalum Inorganic materials 0.000 claims description 3
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 229910019901 yttrium aluminum garnet Inorganic materials 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 2
- 239000000758 substrate Substances 0.000 abstract description 27
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- 239000010408 film Substances 0.000 description 26
- 238000000034 method Methods 0.000 description 23
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- 150000002500 ions Chemical class 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 12
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- 230000000052 comparative effect Effects 0.000 description 8
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- 238000003754 machining Methods 0.000 description 7
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- 238000001179 sorption measurement Methods 0.000 description 6
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- 238000007740 vapor deposition Methods 0.000 description 5
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- 230000008646 thermal stress Effects 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
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- 230000007547 defect Effects 0.000 description 3
- 238000000151 deposition Methods 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000007731 hot pressing Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000005546 reactive sputtering Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
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- 229910052782 aluminium Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
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- 238000010849 ion bombardment Methods 0.000 description 2
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- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000005240 physical vapour deposition Methods 0.000 description 2
- 239000012495 reaction gas Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 229910052727 yttrium Inorganic materials 0.000 description 2
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 2
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical group [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
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- 229910052786 argon Inorganic materials 0.000 description 1
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- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
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- 230000006378 damage Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- -1 lanthanide metal oxides Chemical class 0.000 description 1
- 229910052747 lanthanoid Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
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- 229920003223 poly(pyromellitimide-1,4-diphenyl ether) Polymers 0.000 description 1
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- 238000004506 ultrasonic cleaning Methods 0.000 description 1
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- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/687—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
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- 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
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- 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
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- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L21/6831—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using electrostatic chucks
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
- H05B3/26—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
- H05B3/265—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base the insulating base being an inorganic material, e.g. ceramic
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3817—Carbides
- C04B2235/3826—Silicon carbides
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
- C04B2235/386—Boron nitrides
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
- C04B2235/3873—Silicon nitrides, e.g. silicon carbonitride, silicon oxynitride
Definitions
- the present invention relates to a support that supports a wafer.
- the aforementioned wafer support tends to generate particles from its surface when exposed to corrosive gases and plasma atmospheres in the semiconductor manufacturing process. When the particles adhere to the wafer, they cause defects in subsequent semiconductor manufacturing processes.
- the present invention has been made in view of these circumstances, and its purpose is to provide a new wafer support that is excellent in corrosion resistance to plasma.
- a wafer support comprises a base material made of machinable ceramics, a protective layer covering the surface of the base material, and a conductive member at least partially enclosed in the base material. And prepare.
- the protective layer is composed of a material that is less corroded by plasma than the substrate.
- Machinable ceramics are easier to process than general fine ceramics. Therefore, according to this aspect, even if a complicated shape is not realized at the stage of manufacturing the base material, processing can be performed after manufacturing the base material, so it is possible to manufacture wafer supports of various shapes.
- the protective layer can reduce plasma corrosion of the substrate. Moreover, even if the material constituting the base material is likely to peel off, the protective layer can reduce peeling.
- the protective layer is aluminum nitride (AlN), aluminum oxide (Al2O3), yttrium oxide (Y2O3 ) , magnesium oxide (MgO), yttrium aluminum garnet (YAG: Y3O5Al12 ) and yttrium aluminum It may be composed of at least one or more materials selected from the group consisting of monoclinic (YAM: Y 4 Al 2 O 9 ). This can further reduce plasma corrosion of the base material.
- the thickness of the protective layer may range from 1 to 30 ⁇ m. This makes it possible to achieve both desired adsorption force and corrosion resistance to plasma. If the thickness of the protective layer is preferably 2 ⁇ m or more, more preferably 5 ⁇ m or more, better corrosion resistance to plasma can be obtained. Further, if the thickness of the protective layer is preferably 20 ⁇ m or less, more preferably 10 ⁇ m or less, more sufficient adsorption force can be obtained.
- the protective layer may have an arithmetic mean height Sa in the range of 0.07 to 0.20 ⁇ m. This allows proper contact with the supporting wafer.
- the protective layer may contain 99.0% or more AlN. As a result, AlN's inherent corrosion resistance to plasma can be obtained.
- Machinable ceramics are at least two or more elements essentially containing boron nitride selected from the group consisting of boron nitride (BN), zirconium oxide (ZrO 2 ), silicon nitride (Si 3 N 4 ) and silicon carbide (SiC).
- a sintered body made of the material may be used.
- Boron nitride has excellent machinability, and the machining rate can be increased by using machinable ceramics containing boron nitride as an essential component.
- a wafer support in which a conductive member made of a different material is enclosed inside a base material, internal stress is generated due to temperature changes depending on the difference in physical properties between the base material and the conductive member. Alternatively, the temperature difference between the periphery and the center of the wafer support causes thermal stress.
- boron nitride has excellent thermal shock resistance, the substrate is less likely to crack.
- Machinable ceramics contain 10 to 80% by mass of boron nitride and 0 to 80% by mass of silicon nitride when the total of ceramic components of boron nitride, zirconium oxide, silicon nitride and silicon carbide is 100% by mass. It may contain 0 to 80% by mass of zirconium oxide and 0 to 40% by mass of silicon carbide. When the total amount of ceramic components is 100% by mass, 3 to 25% by mass of sintering aid components may be further included.
- the conductive member may be made of a metal material selected from the group consisting of molybdenum, tungsten, tantalum, and alloys containing them.
- a new wafer support with excellent corrosion resistance to plasma can be realized.
- FIG. 1 is a schematic cross-sectional view of a wafer support according to this embodiment
- FIG. 1 is a diagram showing a photograph of a cross section of a wafer support according to Example 1 taken with a scanning electron microscope (SEM);
- FIG. 3(a) is a SEM photograph of the aluminum nitride substrate surface,
- FIG. 3(b) is a SEM photograph of the machinable ceramic substrate surface, and
- FIG. It is a figure which shows the SEM photograph of the protective layer surface of the wafer support body which concerns.
- 4(a) to 4(c) are schematic diagrams for explaining the plasma exposure test.
- the wafer support only needs to support a semiconductor substrate such as a silicon wafer, and may be provided with a suction mechanism or a heating mechanism.
- the wafer support may simply be a susceptor on which the wafer is mounted.
- the wafer support may be an electrostatic chuck that generates an attraction force with respect to the mounted wafer, or a heater that heats the wafer.
- the object supported by the wafer support is mainly a wafer, it may support other members and parts.
- FIG. 1 is a schematic cross-sectional view of a wafer support according to this embodiment.
- a wafer support 10 is used to support a wafer W within a chamber 12 of a semiconductor manufacturing apparatus such as plasma CVD.
- the wafer support 10 has a substrate 14 made of machinable ceramics, a protective layer 16 covering a surface 14a of the substrate 14, and conductive members 18 and 20 at least partially enclosed in the substrate 14. As shown in FIG.
- the wafer W is mounted on the surface of the protective layer 16, which is the mounting surface 16a.
- the conductive member 18 functions as an electrostatic chuck electrode through which a current that generates an attraction force for fixing the wafer W to the mounting surface 16a flows. Further, the conductive member 20 functions as a resistance heater (heater) for heating the wafer W to a predetermined process temperature.
- the conductive members 18 and 20 are embedded in the base material 14 which is a sintered body. Therefore, the conductive members 18 and 20 must be arranged inside the raw material powder at the stage of firing, and are preferably made of a high-melting-point metal that does not melt at the firing temperature.
- the material of the conductive member is preferably a refractory metal such as molybdenum, tungsten, or tantalum, or an alloy containing two or more of them.
- the wafer support 10 may be formed with a gas introduction port 22 extending from the mounting surface 16a exposed to the chamber side through the interior of the base material 14 to an external gas supply source (not shown).
- the gas introduction port 22 is for supplying a gas for cooling the wafer W attracted to the mounting surface 16a from the rear surface side.
- Machinable ceramics are easier to machine than general fine ceramics such as aluminum oxide, silicon nitride, aluminum nitride, and silicon carbide.
- chipping which is a problem in machining ceramics, is less likely to occur, and complex machining becomes possible.
- the amount of grinding (processing rate) during machining of machinable ceramics is several times to several hundred times the amount of grinding during machining of fine ceramics, and efficient machining is possible.
- Machinable ceramics are composite materials in which multiple raw material compounds are mixed as ceramic components.
- the volume resistivity can be adjusted by adjusting the blending ratio of silicon carbide.
- it is compatible with both the adsorption mechanisms of electrostatic chucks, such as the Coulomb type and the Johnson-Rahbek type.
- electrostatic chucks such as the Coulomb type and the Johnson-Rahbek type.
- it can be used as an insulator by not adding silicon carbide.
- the machinable ceramics does not need to have a uniform composition as a whole, and the function of each part is different between the part that accommodates the conductive member 18 and the part that accommodates the conductive member 20 near the mounting surface 16a on which the wafer W is mounted.
- the composition may be varied so as to optimize the
- boron nitride is listed as one of the main components, and it has superior thermal shock resistance to general aluminum oxide, silicon nitride, aluminum nitride, and silicon carbide, and is used as a wafer support product. Damage due to cracks can be prevented.
- the machinable ceramics according to the present embodiment are sintered bodies made of at least two materials essentially including boron nitride selected from the group consisting of boron nitride, zirconium oxide, silicon nitride and silicon carbide. Boron nitride is also excellent in machinability, and the machining rate can be increased by using machinable ceramics containing boron nitride as an essential component. Further, in the case of a wafer support in which a conductive member made of a different material is enclosed inside a base material, internal stress is generated due to temperature changes depending on the difference in physical properties between the base material and the conductive member. Alternatively, the temperature difference between the periphery and the center of the wafer support causes thermal stress. However, since boron nitride has excellent thermal shock resistance, the substrate is less likely to crack.
- the machinable ceramics according to the present embodiment contain 10 to 80% by mass of boron nitride when the total of the ceramic components of boron nitride, zirconium oxide, silicon nitride and silicon carbide is 100% by mass, and silicon nitride. It is preferable to contain 0 to 80% by mass, 0 to 80% by mass of zirconium oxide, and 0 to 40% by mass of silicon carbide.
- the machinable ceramics according to the present embodiment contains a sintering aid component.
- the sintering aid can be selected from those used for sintering silicon nitride and boron nitride.
- Preferred sintering aids are aluminum oxide (alumina), magnesium oxide (magnesia), yttrium oxide (yttria), and one or more of lanthanide metal oxides. More preferred is a mixture of alumina and yttria, a mixture further added with magnesia, or a mixture of yttria and magnesia.
- the amount of the sintering aid component is desirably in the range of 1 to 25% by mass, particularly 3 to 25% by mass, when the sum of the ceramic components is 100% by mass.
- the amount of the sintering aid component is 1% by mass or more, preferably 3% by mass or more, densification is facilitated, and insufficient density of the sintered body and deterioration of mechanical properties can be suppressed.
- the amount of the sintering aid component is 25% by mass or less, the grain boundary phase with low strength is reduced, thereby suppressing the decrease in mechanical strength and the decrease in workability due to the increase in the grain boundary phase. can.
- boron nitride Although boron nitride has excellent machinability, it has poor strength characteristics. Therefore, if coarse boron nitride is present in the sintered body, it becomes a starting point of fracture, which becomes a factor of chipping and cracking during processing. In order not to form such coarse boron nitride particles, it is effective to pulverize the raw material powder. It is desirable that the main raw material powder, particularly the boron nitride raw material powder, has an average particle size of less than 2 ⁇ m.
- Boron nitride has a hexagonal system (h-BN) low-pressure phase, a cubic system (c-BN) high-pressure phase, and the like, but hexagonal boron nitride is preferable from the standpoint of machinability. From the standpoint of workability, more boron nitride and less silicon nitride (and zirconium oxide) are more preferable. In addition, the mechanical strength and Young's modulus decrease as the amount of boron nitride increases and the amount of silicon nitride (and zirconium oxide) decreases.
- machinable ceramics examples include BN-containing silicon nitride-based ceramics ("Photovere II” and "Photovere II-k70” manufactured by Ferrotec Material Technologies Corporation).
- the composition of Photoveil II-k70 is 38.5% by mass of boron nitride, 54.1% by mass of silicon nitride, 5.5% by mass of yttria, and 1.9% by mass of magnesia.
- This BN-containing silicon nitride ceramic has a bending strength of 600 MPa or less, a Young's modulus of 250 GPa or less, and a Vickers hardness of 5 GPa or less.
- Machinable ceramics having such properties have a large grinding amount (processing rate) per unit time during processing, and can be efficiently produced even for wafer supports having complicated shapes. Also, a complex wafer support can be manufactured in one piece by fabricating the base material as a block of a simple shape and then cutting it into a desired shape.
- the total of the main raw material powder as a ceramic component such as boron nitride, zirconium oxide, silicon nitride and silicon carbide, and the ceramic component was set to 100% by mass.
- 3 to 25% by mass of sintering aid powder is mixed to prepare raw material powder. This mixing can be performed, for example, by a wet ball mill or the like.
- a sintered body is produced by molding the raw material powder, the molded body, or both under high temperature and pressure, and firing them.
- a part of the raw material powder or the molded body may be replaced with a sintered body.
- the conductive material is required after firing.
- a member or material for example, a metal plate, a metal foil, a conductive paste, a coil, a mesh, etc.
- the shape of the conductor is not particularly limited.
- This firing can be performed using, for example, a hot press device.
- Hot pressing is performed in a non-oxidizing (inert) atmosphere such as nitrogen or argon atmosphere, but may be performed in pressurized nitrogen.
- the hot pressing temperature is, for example, in the range of 1300-1950°C. If the temperature is too low, sintering will be insufficient, and if it is too high, thermal decomposition of the main raw material will occur. Appropriate pressure is in the range of 20 to 50 MPa.
- the duration of hot pressing depends on the temperature and dimensions, but is usually about 1 to 4 hours.
- Hot pressure sintering can also be performed by HIP (hot isostatic pressing). The sintering conditions in this case can also be appropriately set by those skilled in the art.
- the sintered body is processed into a desired shape to manufacture a wafer support.
- the machinable ceramics according to the present embodiment have high strength and high machinability (free-cutting property), complex microfabrication is possible in an industrially realistic time.
- the conditions for producing the sintered body are preferably selected so that the average crystal grain size of the machinable ceramics is 0.5 ⁇ m or less, taking into account the corrosion resistance due to plasma, which will be described later. As a result, even if part of the polycrystal is peeled off as particles due to corrosion in the plasma atmosphere, defects in the semiconductor manufacturing process can be reduced because the particles themselves are small.
- the average crystal grain size of machinable ceramics is more preferably 0.1 ⁇ m or less.
- the machinable ceramics used for the base material 14 according to the present embodiment are easier to process than general fine ceramics. Therefore, according to this aspect, even if a complicated shape is not realized at the stage of manufacturing the base material 14, processing can be performed after the base material is manufactured, so it is possible to manufacture wafer supports of various shapes. .
- the wafer support 10 is exposed to a corrosive gas or plasma atmosphere during the semiconductor manufacturing process depending on the application.
- corrosive plasma include fluorine-based gases such as CF 4 , C 4 F 8 , SF 8 , NF 3 and CHF 3 , and in addition gases such as Ar, O 2 and CO 2 may be mixed.
- fluorine-based gases such as CF 4 , C 4 F 8 , SF 8 , NF 3 and CHF 3
- gases such as Ar, O 2 and CO 2 may be mixed.
- the silicon component is highly reactive with fluorine-based plasmas, silicon-containing substrates are less resistant to these plasmas. Boron nitride is also highly reactive with O2 plasma.
- the machinable ceramics according to the present embodiment may contain silicon nitride, silicon carbide, and boron nitride as main components. We thought that the corrosion resistance might be lowered in a hot plasma atmosphere.
- a protective layer 16 is provided on the surface of the substrate 14 of the wafer support 10 according to the present embodiment in order to improve the corrosion resistance of the wafer support against plasma.
- the protective layer 16 is made of a material that is less corroded by plasma than the base material 14 . Thereby, the protective layer 16 can reduce the corrosion of the base material 14 by the plasma. Moreover, even if the material forming the base material 14 is likely to peel off, the protective layer 16 can reduce peeling.
- Protective layer 16 includes aluminum nitride, aluminum oxide, yttrium oxide, magnesium oxide, yttrium aluminum garnet ( YAG: Y3O5Al12 ) and yttrium aluminum monoclinic (YAM: Y4Al2O9 ) is composed of at least one or more materials selected from the group consisting of
- aluminum nitride is excellent in thermal shock resistance, so it is a suitable material for a process in which a high thermal shock is applied to the electrostatic chuck.
- the thickness between the mounting surface 16a, which is the surface of the protective layer 16, and the conductive member 18 is the thickness t of the dielectric layer. Therefore, if the film thickness of the protective layer 16 is too thick, the thickness t of the dielectric layer will be too large, and sufficient adsorption force will not be obtained. Also, if the thickness t is too large, cracks are likely to occur in the protective layer 16 when a high thermal shock is applied. On the other hand, if the thickness t of the protective layer 16 is too small, sufficient corrosion resistance against plasma cannot be obtained. Therefore, the protective layer 16 according to the present embodiment has a thickness in the range of 1 to 30 ⁇ m. This makes it possible to achieve both desired adsorption force and corrosion resistance to plasma.
- the thickness of the protective layer 16 is preferably 2 ⁇ m or more, more preferably 5 ⁇ m or more, better corrosion resistance to plasma can be obtained. Further, if the thickness of the protective layer 16 is preferably 20 ⁇ m or less, more preferably 10 ⁇ m or less, more sufficient adsorption force can be obtained.
- Film formation of the protective layer is performed by methods such as CVD, PVD (sputtering and ion plating), and aerosol deposition, for example. Since these methods are excellent in film thickness control, it is possible to form a film with high precision within the thickness range of 1 to 30 ⁇ m, like the thickness of the protective layer described above.
- Sputtering is performed by placing a substrate and a target (material to be a film) facing each other, applying a negative high voltage to the target in an Ar gas atmosphere of about 10 -1 to several Pa to cause discharge, and causing Ar ions to collide with the target. .
- Ar ions collide atoms are ejected from the target by sputtering phenomenon.
- a protective layer is formed by depositing the ejected atoms on the substrate.
- a reactive sputtering method is suitable for forming the protective layer 16 according to the present embodiment. If a compound such as aluminum oxide or aluminum nitride is used as a target, the sputtering rate will drop significantly, resulting in a very low coating speed, and the film will form a film that deviates from the composition of the target due to the different sputtering rates for each element. known to be Therefore, when the constituent material of the protective layer according to the present embodiment is aluminum nitride, a reactive sputtering method is suitable in which a single metal aluminum target is used and reacted with N 2 which is a reactive gas.
- Ion plating which is another method of forming a protective layer, places a substrate and an evaporation source (material to form a film) facing each other, and dissolves the raw material of the film from the evaporation source in a vacuum of about 10 -2 to 10 -4 Pa. ⁇ A method of evaporating and depositing on a substrate. Films of various materials can be produced depending on the type of material to be evaporated and the introduction of reaction gas. Among coating techniques based on vacuum deposition, all methods using ions are called ion plating. Specifically, there are various methods such as high-frequency ion plating, reactive ion plating, and ion-assisted vapor deposition, and any of them can be used.
- the constituent material of the protective layer according to this embodiment is yttrium oxide
- metal yttrium is used as the vapor deposition source
- O 2 is introduced as the reaction gas
- the film can be formed in a plasma atmosphere.
- yttrium oxide is used as the vapor deposition source and O 2 ions are used as assist ions, so that a protective layer made of yttrium oxide can be formed.
- the film can be formed by high-frequency ion plating, reactive ion plating, or ion-assisted vapor deposition.
- the surface can be cleaned with Ar ions before film formation (remove surface deposits and oxide films by ion bombardment), so adhesion is improved.
- a high film can be obtained.
- N 2 ions and H 2 ions are particularly effective for cleaning organic matter (a process generally called ion bombardment).
- the bombardment process can remove very fine particles (those that cannot be completely removed by ultrasonic cleaning, etc.) on the surface of the machinable ceramics, which is the base material. Initial particle generation can be reduced. Compared to bulk ceramics made by baking powder, these methods can increase the purity of aluminum nitride, reducing concerns about wafer contamination and contributing to a reduction in defects.
- the electrostatic chuck using a base material made of machinable ceramics can be used even if the surface roughness of the base material is within a predetermined range (for example, the arithmetic mean roughness Ra is in the range of 0.02 ⁇ m ⁇ Ra ⁇ 0.2 ⁇ m). In this case, since it makes point contact with the wafer, there is less friction with the wafer during dechucking. On the other hand, due to the cleavability of boron nitride, physical force tends to cause separation (cracking) of the particles, so particles are likely to be generated as they are.
- a predetermined range for example, the arithmetic mean roughness Ra is in the range of 0.02 ⁇ m ⁇ Ra ⁇ 0.2 ⁇ m.
- the protective layer 16 such as aluminum nitride described above, peeling of particles can be reduced and generation of particles can be reduced.
- the protective layer 16 produced by the film forming method according to the present embodiment follows the surface roughness of the substrate 14, and has an arithmetic mean roughness Ra in the range of 0.02 ⁇ m ⁇ Ra ⁇ 0.2 ⁇ m. have a surface.
- the wafer support 10 according to the present embodiment is extremely excellent in reducing particles because the protective layer 16 itself can be in point contact with the wafer while being provided with the protective layer 16 having corrosion resistance against plasma.
- each layer is composed of hard materials (a combination of materials with a high Young's modulus)
- the stress can be absorbed (relaxed) by using the substrate 14 containing boron nitride as a main component.
- the machinable ceramics according to the present embodiment is a composite material, it is possible to match the coefficient of thermal expansion of the base material 14 with the coefficient of thermal expansion of the protective layer 16 . As a result, the thermal stress caused by the difference in coefficient of thermal expansion of each layer can be reduced, and the generation of cracks, that is, the generation of particles is suppressed.
- Table 1 shows the contents of the ceramic component and the sintering aid component in each example and each comparative example.
- the film thickness was measured from a cross-sectional photograph taken with a scanning electron microscope.
- FIG. 2 is a diagram showing a photograph of a cross section of the wafer support according to Example 1 taken by a scanning electron microscope (SEM).
- the protective layer 16 shown in FIG. 2 is an aluminum nitride film with a thickness of 5 ⁇ m formed by a reactive sputtering method. As shown in FIG. 2, the protective layer 16 according to Example 1 is a dense film without voids.
- Table 2 shows the sample surface characteristics of the wafer supports according to Examples 1 to 6 and Comparative Examples 1 to 3 and the plasma exposure test results.
- FIG. 3(a) is a SEM photograph of the aluminum nitride substrate surface
- FIG. 3(b) is a SEM photograph of the machinable ceramic substrate surface
- FIG. It is a figure which shows the SEM photograph of the protective layer surface of the wafer support body which concerns.
- Arithmetic mean roughness Ra specified in JIS B 0601 was measured as the state of the sample surface.
- the arithmetic mean height Sa defined by ISO 25178 was measured with a confocal microscope VK-X1050 manufactured by Keyence Corporation.
- the surface of the protective layer was measured, and in Comparative Examples 1 to 3, the surface of the substrate, which is a sintered body, was measured.
- the surface of the aluminum nitride substrate shown in FIG. 3(a) has Ra of 0.05 ⁇ m and Sa of 0.061 ⁇ m.
- the protective layer surface of the wafer support has Ra of 0.08 ⁇ m and Sa of 0.082 ⁇ m. That is, at least when the machinable ceramic is used as the base material, the arithmetic mean height Sa is larger and the contact area with the wafer is smaller, regardless of the presence or absence of the protective layer, compared to when aluminum nitride is used as the base material. . As a result, as described above, particles generated from the wafer support can be reduced.
- the protective layer according to the present embodiment preferably has an arithmetic mean height Sa in the range of 0.07 to 0.20 ⁇ m. This allows proper contact with the supporting wafer.
- FIG. 4(a) to 4(c) are schematic diagrams for explaining the plasma exposure test.
- the plasma generator used for the test is RIE-10N manufactured by Samco Corporation.
- the plasma output is 100 W
- the gas species is a mixture of 40 sccm of CF 4 and 10 sccm of O 2 .
- the pressure is 40 Pa
- the treatment time is 240 minutes (30 minutes x 8 times).
- a mask 26 such as Kapton tape is attached to a portion of a sample 24 to be tested, which simulates a wafer support, and is plasma-treated as shown in FIG. 4(b). After a predetermined treatment time, the mask 26 was removed, and the step d between the portion not covered with the mask 26 and the portion covered with the mask 26 was measured as the corrosion amount (see FIG. 4(c)).
- the wafer supports according to Examples 1 to 6 had a step d of 0 ⁇ m and no corrosion was confirmed.
- the wafer supports according to Comparative Examples 1 to 3, which did not have a protective film had a step d of 4 ⁇ m or more.
- the wafer supports according to Examples 1 to 6 all have an increase in the value of the arithmetic mean height Sa indicating the surface roughness after the plasma exposure test, compared to the wafer supports according to Comparative Examples 1 to 3. Small quantity. In other words, the smaller the corrosion amount (step) and the smaller the surface roughness (arithmetic mean height), the higher the plasma resistance.
- Corrosion resistance to plasma may be affected by physical etching in addition to etching by the chemical reaction described above.
- a protective layer made of a material containing a substance (for example, aluminum or yttrium) that does not easily sublime even when reacted with plasma using a fluorine-based (CF 4 ) gas corrosion resistance due to chemical reaction is improved.
- CF 4 fluorine-based
- the film hardness was obtained by measuring the nanoindentation hardness H_IT by the nanoindentation method and converting it into Vickers hardness (GPa).
- the wafer supports according to Examples 1, 3, and 4 have a Vickers hardness of 10 GPa or more, and are expected to have even higher corrosion resistance to plasma in combination with the results of the amount of corrosion in the plasma exposure test.
- the Vickers hardness is low like the wafer support according to Comparative Example 2, it may be scratched during packing or assembly to an apparatus, which may cause particles.
- additives are often added.
- silicon carbide, carbon (C), titanium oxide (TiO 2 ), etc. are mixed with aluminum nitride in an amount of several to ten and several percent.
- these additives may weaken the corrosion resistance to plasma, or cause particles to be generated due to non-uniform etching (corrosion).
- the volume resistivity is controlled by the base material, and the material of the protective layer covering the surface thereof is made highly pure, thereby reducing the influence of the additive on the protective layer.
- high-purity aluminum nitride may be provided as a protective layer.
- the protective layer may contain at least 99.0%, more preferably at least 99.5% aluminum nitride.
- the inherent plasma corrosion resistance of aluminum nitride can be obtained.
- high-purity aluminum nitride is produced by sputtering, it can be realized by using high-purity aluminum metal and high-purity N 2 gas and forming a film in a vacuum atmosphere with little impurity contamination.
- Electrostatic chucks for film formation require a high processing temperature (heater temperature) of up to 500.degree.
- a high processing temperature for example, when a wafer at room temperature (25.degree. C.) is transferred to such a high-temperature electrostatic chuck, a thermal shock of .DELTA.475.degree.
- the thermal shock of aluminum nitride ceramics is about ⁇ 400° C., there is a concern that the ceramics may be damaged in the case of an electrostatic chuck consisting only of a base material mainly composed of aluminum nitride.
- a base material made of machinable ceramics when provided as in the case of the wafer support according to the present embodiment, it is excellent in thermal shock resistance.
- the protective layer covering the base material surface is made of a material such as aluminum nitride, aluminum oxide, yttrium oxide, or YAG whose thermal shock resistance is not as high as machinable ceramics, a thin film of about 1 to 30 ⁇ m can be used. If there is, the thermal shock resistance is not impaired.
- an electrostatic chuck whose base material is made of machinable ceramics provides anisotropy in thermal conductivity, but if the protective layer is a thin film, the anisotropy obtained by the base material is not impaired.
- the present invention has been described with reference to the above-described embodiments and examples, the present invention is not limited to the above-described embodiments, and the configurations of the embodiments may be appropriately combined or replaced. It is also included in the present invention. Further, it is also possible to appropriately rearrange the combinations and the order of steps in the embodiments based on the knowledge of a person skilled in the art, and to add modifications such as various design changes to the embodiments. Embodiments described may also fall within the scope of the present invention.
- the present invention can be used for electrostatic chucks.
- Wafer support 10 Wafer support, 12 Chamber, 14 Base material, 14a Surface, 16 Protective layer, 16a Mounting surface, 18 Conductive member, 20 Conductive member, 22 Gas inlet, 24 Sample, 26 Mask, W Wafer.
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Abstract
Description
ウエハ支持体は、シリコンウエハ等の半導体基板を支持できればよく、吸着機構や加熱機構を備えていてもよい。例えば、ウエハ支持体は、単にウエハを搭載するサセプタであってもよい。また、ウエハ支持体は、搭載されたウエハに対して吸着力を生じる静電チャックや、ウエハを加熱するヒータであってもよい。また、ウエハ支持体が支持する対象物は、主にウエハであるが、その他の部材や部品を支持するものであってもよい。
本発明者は、ウエハ支持体に適した材料を見出すために鋭意検討した結果、加工性がよい(快削性を有する)いわゆるマシナブルセラミックスからなる焼結体が好ましいことを見出した。
まず、後述する各実施例や各比較例の配合量に応じて、窒化ホウ素、酸化ジルコニウム、窒化ケイ素および炭化ケイ素等のセラミックス成分となる主原料粉末と、セラミックス成分の合計を100質量%とした場合に、3~25質量%の焼結助剤粉末と、を混合して原料粉末を調製する。この混合は、例えば、湿式ボールミル等により行うことができる。
本実施の形態に係る保護層16は、基材14よりもプラズマによる腐食が少ない材料で構成されている。これにより、基材14に対するプラズマによる腐食を保護層16により低減できる。また、基材14を構成する材料が剥離しやすい場合であっても、保護層16により剥離を低減できる。本実施の形態に係る保護層16は、窒化アルミニウム、酸化アルミニウム、酸化イットリウム、酸化マグネシウム、イットリウムアルミニウムガーネット(YAG:Y3O5Al12)及びイットリウムアルミニウムモノクリニック(YAM:Y4Al2O9)からなる群より選択された少なくとも一つ以上の材料で構成されている。特に窒化アルミニウムは耐熱衝撃性に優れているため、静電チャックに高い熱衝撃が加わるプロセスにおいて好適な材料である。
保護層の成膜は、例えば、CVD、PVD(スパッタリングやイオンプレーティング)、エアロゾルデポジションといった方法で行われる。これらの方法は、膜厚制御に優れているため、前述の保護層の厚みのように1~30μmの範囲で精度の高い成膜が可能である。
次に、各実施例や各比較例に係るウエハ支持体の特性について説明する。各実施例および各比較例におけるセラミックス成分および焼結助剤成分の含有量は表1に示すとおりである。膜厚は走査型電子顕微鏡により撮影した断面写真から計測した。図2は、実施例1に係るウエハ支持体の断面を走査型電子顕微鏡(SEM)により撮影した写真を示す図である。図2に示す保護層16は、反応性スパッタリング法により成膜された厚さ5μmの窒化アルミニウム膜である。図2に示すように、実施例1に係る保護層16は、ボイドがなく緻密な膜である。
図3(a)は、窒化アルミの基板表面のSEM写真を示す図、図3(b)は、マシナブルセラミックスの基板表面のSEM写真を示す図、図3(c)は、実施例1に係るウエハ支持体の保護層表面のSEM写真を示す図である。試料表面の状態として、JIS B 0601で規定された算術平均粗さRaを測定した。また、他の試料表面の状態として、ISO 25178で規定された算術平均高さSaを、株式会社キーエンス製共焦点顕微鏡VK-X1050で測定した。なお、実施例1~6については保護層の表面を、比較例1~3については焼結体である基材の表面を測定した。
図4(a)~図4(c)は、プラズマ暴露試験を説明するための模式図である。試験に用いたプラズマ発生装置は、サムコ株式会社製のRIE-10Nである。プラズマ出力は100W、ガス種はCF4を40sccm、O2を10sccm混合したものである。圧力は40Pa、処理時間は240分(30分×8回)である。図4(a)に示すように、ウエハ支持体を模した試験対象の試料24の一部にカプトンテープ等のマスク26を貼り付け、図4(b)に示すようにプラズマ処理をする。所定の処理時間後にマスク26を除去し、マスク26が覆われていなかった場所と、マスク26で覆われていた場所との段差dを腐食量として測定した(図4(c)参照)。
プラズマに対する耐食性には、前述の化学反応によるエッチング以外に物理的なエッチングが影響を与える可能性がある。例えば、フッ素系(CF4)のガスを用いたプラズマと反応しても昇華しにくい物質(例えばアルミニウムやイットリウム)を含む材料を保護層とすることで、化学的反応による耐食性は向上する。加えて、物理的な衝撃にも強い高硬度な保護層であれば、プラズマに対する更に高い耐食性が期待される。
ジョンソン・ラーベック(J-R)型の静電チャックでは、ウエハ支持体におけるセラミックスの体積抵抗率を109Ωcm程度に制御する必要がある。成膜用(PVD、CVD)の静電チャックは、使用温度域が~500℃と高いが、一般的な絶縁性セラミックスは、温度が上がると抵抗率が下がってくる。そのため、使用温度域毎に抵抗率を変えたセラミックスを使用する。
成膜用の静電チャック、特にCVD用のヒータ入り静電チャックでは、処理温度(ヒーター温度)が~500℃と高い。このような高温の静電チャックに、例えば室温(25℃)のウエハを搬送してくると、Δ475℃の熱衝撃がかかる。これに対して、窒化アルミニウムセラミックスの耐熱衝撃はΔ400℃程度であるため、窒化アルミニウムが主成分の基材のみからなる静電チャックの場合、セラミックスの破損が懸念される。
Claims (8)
- マシナブルセラミックスからなる基材と、前記基材の表面を覆う保護層と、前記基材に少なくとも一部が内包された導電部材と、を備え、
前記保護層は、前記基材よりもプラズマによる腐食が少ない材料で構成されていることを特徴とするウエハ支持体。 - 前記保護層は、窒化アルミニウム、酸化アルミニウム、酸化イットリウム、酸化マグネシウム、イットリウムアルミニウムガーネット(YAG:Y3O5Al12)及びイットリウムアルミニウムモノクリニック(YAM:Y4Al2O9)からなる群より選択された少なくとも一つ以上の材料で構成されていることを特徴とする請求項1に記載のウエハ支持体。
- 前記保護層は、厚みが1~30μmの範囲であることを特徴とする請求項1又は2に記載のウエハ支持体。
- 前記保護層は、算術平均高さSaが0.07~0.20μmの範囲であることを特徴とする請求項1乃至3のいずれか1項に記載のウエハ支持体。
- 前記保護層は、99.0%以上の窒化アルミニウムを含むことを特徴とする請求項1乃至4のいずれか1項に記載のウエハ支持体。
- 前記マシナブルセラミックスは、窒化ホウ素、酸化ジルコニウム、窒化ケイ素および炭化ケイ素からなる群より選択された窒化ホウ素を必須とする少なくとも二つ以上の材料からなる焼結体であることを特徴とする請求項1乃至5のいずれか1項に記載のウエハ支持体。
- 前記マシナブルセラミックスは、
窒化ホウ素、酸化ジルコニウム、窒化ケイ素および炭化ケイ素のセラミックス成分の合計を100質量%とした場合に、窒化ホウ素を10~80質量%含有し、窒化ケイ素を0~80質量%含有し、酸化ジルコニウムを0~80質量%含有し、炭化ケイ素を0~40質量%含有し、
前記セラミックス成分の合計を100質量%とした場合に、更に焼結助剤成分を3~25質量%含有することを特徴とする請求項6に記載のウエハ支持体。 - 前記導電部材は、モリブデン、タングステン、タンタルおよびそれらを含む合金からなる群から選択される金属材料で構成されていることを特徴とする請求項1乃至7のいずれか1項に記載のウエハ支持体。
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JP2006045059A (ja) * | 2005-09-05 | 2006-02-16 | Ngk Insulators Ltd | 窒化アルミニウム質焼結体、耐蝕性部材、金属埋設品および半導体保持装置 |
JP2019194495A (ja) * | 2018-05-02 | 2019-11-07 | アプライド マテリアルズ インコーポレイテッドApplied Materials,Incorporated | 基板支持アセンブリ用の多領域ガスケット |
JP2020155571A (ja) | 2019-03-20 | 2020-09-24 | 株式会社フェローテックマテリアルテクノロジーズ | ウエハ支持体およびウエハ支持体の製造方法 |
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JP2006045059A (ja) * | 2005-09-05 | 2006-02-16 | Ngk Insulators Ltd | 窒化アルミニウム質焼結体、耐蝕性部材、金属埋設品および半導体保持装置 |
JP2019194495A (ja) * | 2018-05-02 | 2019-11-07 | アプライド マテリアルズ インコーポレイテッドApplied Materials,Incorporated | 基板支持アセンブリ用の多領域ガスケット |
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