WO2018079599A1 - ジヒドロキシ基を有する有機基を含むシリコン含有レジスト下層膜形成組成物 - Google Patents
ジヒドロキシ基を有する有機基を含むシリコン含有レジスト下層膜形成組成物 Download PDFInfo
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- WO2018079599A1 WO2018079599A1 PCT/JP2017/038505 JP2017038505W WO2018079599A1 WO 2018079599 A1 WO2018079599 A1 WO 2018079599A1 JP 2017038505 W JP2017038505 W JP 2017038505W WO 2018079599 A1 WO2018079599 A1 WO 2018079599A1
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- underlayer film
- resist underlayer
- resist
- hydrolyzable silane
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- 239000000203 mixture Substances 0.000 title claims abstract description 81
- 125000000962 organic group Chemical group 0.000 title claims abstract description 46
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 26
- 239000010703 silicon Substances 0.000 title abstract description 14
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims abstract description 85
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- 125000004432 carbon atom Chemical group C* 0.000 description 11
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- 239000003054 catalyst Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 9
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- 229960002317 succinimide Drugs 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- SEEPANYCNGTZFQ-UHFFFAOYSA-N sulfadiazine Chemical compound C1=CC(N)=CC=C1S(=O)(=O)NC1=NC=CC=N1 SEEPANYCNGTZFQ-UHFFFAOYSA-N 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 125000004963 sulfonylalkyl group Chemical group 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- UQMOLLPKNHFRAC-UHFFFAOYSA-N tetrabutyl silicate Chemical compound CCCCO[Si](OCCCC)(OCCCC)OCCCC UQMOLLPKNHFRAC-UHFFFAOYSA-N 0.000 description 1
- BRGJIIMZXMWMCC-UHFFFAOYSA-N tetradecan-2-ol Chemical compound CCCCCCCCCCCCC(C)O BRGJIIMZXMWMCC-UHFFFAOYSA-N 0.000 description 1
- RAOIDOHSFRTOEL-UHFFFAOYSA-N tetrahydrothiophene Chemical compound C1CCSC1 RAOIDOHSFRTOEL-UHFFFAOYSA-N 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- ZUEKXCXHTXJYAR-UHFFFAOYSA-N tetrapropan-2-yl silicate Chemical compound CC(C)O[Si](OC(C)C)(OC(C)C)OC(C)C ZUEKXCXHTXJYAR-UHFFFAOYSA-N 0.000 description 1
- ZQZCOBSUOFHDEE-UHFFFAOYSA-N tetrapropyl silicate Chemical compound CCCO[Si](OCCC)(OCCC)OCCC ZQZCOBSUOFHDEE-UHFFFAOYSA-N 0.000 description 1
- LPSKDVINWQNWFE-UHFFFAOYSA-M tetrapropylazanium;hydroxide Chemical compound [OH-].CCC[N+](CCC)(CCC)CCC LPSKDVINWQNWFE-UHFFFAOYSA-M 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- GYZQBXUDWTVJDF-UHFFFAOYSA-N tributoxy(methyl)silane Chemical compound CCCCO[Si](C)(OCCCC)OCCCC GYZQBXUDWTVJDF-UHFFFAOYSA-N 0.000 description 1
- GQIUQDDJKHLHTB-UHFFFAOYSA-N trichloro(ethenyl)silane Chemical compound Cl[Si](Cl)(Cl)C=C GQIUQDDJKHLHTB-UHFFFAOYSA-N 0.000 description 1
- VAXCNWCOODGCCT-UHFFFAOYSA-N trichloro-(2-ethoxynaphthalen-1-yl)silane Chemical compound C1=CC=CC2=C([Si](Cl)(Cl)Cl)C(OCC)=CC=C21 VAXCNWCOODGCCT-UHFFFAOYSA-N 0.000 description 1
- QDGORAVIRGNDBW-UHFFFAOYSA-N trichloro-(2-ethoxyphenyl)silane Chemical compound CCOC1=CC=CC=C1[Si](Cl)(Cl)Cl QDGORAVIRGNDBW-UHFFFAOYSA-N 0.000 description 1
- PUOCWUHEMWGXIQ-UHFFFAOYSA-N trichloro-(2-methoxy-2-phenylethyl)silane Chemical compound COC(C[Si](Cl)(Cl)Cl)C1=CC=CC=C1 PUOCWUHEMWGXIQ-UHFFFAOYSA-N 0.000 description 1
- WZLYTTRTHVZCNU-UHFFFAOYSA-N trichloro-(2-methoxynaphthalen-1-yl)silane Chemical compound C1=CC=CC2=C([Si](Cl)(Cl)Cl)C(OC)=CC=C21 WZLYTTRTHVZCNU-UHFFFAOYSA-N 0.000 description 1
- YTWFIHFZPSAMFV-UHFFFAOYSA-N trichloro-(2-methoxyphenyl)silane Chemical compound COC1=CC=CC=C1[Si](Cl)(Cl)Cl YTWFIHFZPSAMFV-UHFFFAOYSA-N 0.000 description 1
- SBNVEGJDYHYOSA-UHFFFAOYSA-N trichloro-(2-propan-2-yloxyphenyl)silane Chemical compound CC(C)OC1=CC=CC=C1[Si](Cl)(Cl)Cl SBNVEGJDYHYOSA-UHFFFAOYSA-N 0.000 description 1
- BXYASSFFTRSIGT-UHFFFAOYSA-N trichloro-[(2-methylpropan-2-yl)oxy-phenylmethyl]silane Chemical compound CC(C)(C)OC([Si](Cl)(Cl)Cl)C1=CC=CC=C1 BXYASSFFTRSIGT-UHFFFAOYSA-N 0.000 description 1
- OUMAYXXJSADQBQ-UHFFFAOYSA-N trichloro-[2-[(2-methylpropan-2-yl)oxy]phenyl]silane Chemical compound CC(C)(C)OC1=CC=CC=C1[Si](Cl)(Cl)Cl OUMAYXXJSADQBQ-UHFFFAOYSA-N 0.000 description 1
- ZZARCDHCAFJWJC-UHFFFAOYSA-N trichloro-[ethoxy(phenyl)methyl]silane Chemical compound CCOC([Si](Cl)(Cl)Cl)C1=CC=CC=C1 ZZARCDHCAFJWJC-UHFFFAOYSA-N 0.000 description 1
- SMGOKIYLLQQVJE-UHFFFAOYSA-N trichloro-[methoxy(phenyl)methyl]silane Chemical compound COC([Si](Cl)(Cl)Cl)C1=CC=CC=C1 SMGOKIYLLQQVJE-UHFFFAOYSA-N 0.000 description 1
- UEUXEIHYBASMLX-UHFFFAOYSA-N trichloro-[phenyl(propan-2-yloxy)methyl]silane Chemical compound CC(C)OC([Si](Cl)(Cl)Cl)C1=CC=CC=C1 UEUXEIHYBASMLX-UHFFFAOYSA-N 0.000 description 1
- FAQYAMRNWDIXMY-UHFFFAOYSA-N trichloroborane Chemical compound ClB(Cl)Cl FAQYAMRNWDIXMY-UHFFFAOYSA-N 0.000 description 1
- ZYXIPWRSWYTOFY-UHFFFAOYSA-N triethoxy(3-sulfonylpropyl)silane Chemical compound S(=O)(=O)=CCC[Si](OCC)(OCC)OCC ZYXIPWRSWYTOFY-UHFFFAOYSA-N 0.000 description 1
- DENFJSAFJTVPJR-UHFFFAOYSA-N triethoxy(ethyl)silane Chemical compound CCO[Si](CC)(OCC)OCC DENFJSAFJTVPJR-UHFFFAOYSA-N 0.000 description 1
- QQQSFSZALRVCSZ-UHFFFAOYSA-N triethoxysilane Chemical compound CCO[SiH](OCC)OCC QQQSFSZALRVCSZ-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical compound OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 description 1
- JOHWNGGYGAVMGU-UHFFFAOYSA-N trifluorochlorine Chemical compound FCl(F)F JOHWNGGYGAVMGU-UHFFFAOYSA-N 0.000 description 1
- 125000005951 trifluoromethanesulfonyloxy group Chemical group 0.000 description 1
- JLGNHOJUQFHYEZ-UHFFFAOYSA-N trimethoxy(3,3,3-trifluoropropyl)silane Chemical compound CO[Si](OC)(OC)CCC(F)(F)F JLGNHOJUQFHYEZ-UHFFFAOYSA-N 0.000 description 1
- IJQHYEFNLXHUGV-UHFFFAOYSA-N trimethoxysilylmethyl acetate Chemical compound CO[Si](OC)(OC)COC(C)=O IJQHYEFNLXHUGV-UHFFFAOYSA-N 0.000 description 1
- HADKRTWCOYPCPH-UHFFFAOYSA-M trimethylphenylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C1=CC=CC=C1 HADKRTWCOYPCPH-UHFFFAOYSA-M 0.000 description 1
- XMUJIPOFTAHSOK-UHFFFAOYSA-N undecan-2-ol Chemical compound CCCCCCCCCC(C)O XMUJIPOFTAHSOK-UHFFFAOYSA-N 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000005050 vinyl trichlorosilane Substances 0.000 description 1
Classifications
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- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/11—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having cover layers or intermediate layers, e.g. subbing layers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/68—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the catalysts used
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/075—Silicon-containing compounds
- G03F7/0752—Silicon-containing compounds in non photosensitive layers or as additives, e.g. for dry lithography
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/42—Stripping or agents therefor
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/42—Stripping or agents therefor
- G03F7/422—Stripping or agents therefor using liquids only
- G03F7/423—Stripping or agents therefor using liquids only containing mineral acids or salts thereof, containing mineral oxidizing substances, e.g. peroxy compounds
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
- H01L21/0274—Photolithographic processes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/033—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers
- H01L21/0332—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their composition, e.g. multilayer masks, materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/541—Silicon-containing compounds containing oxygen
- C08K5/5415—Silicon-containing compounds containing oxygen containing at least one Si—O bond
- C08K5/5419—Silicon-containing compounds containing oxygen containing at least one Si—O bond containing at least one Si—C bond
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/02126—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02205—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition
- H01L21/02208—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si
- H01L21/02214—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si the compound comprising silicon and oxygen
- H01L21/02216—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si the compound comprising silicon and oxygen the compound being a molecule comprising at least one silicon-oxygen bond and the compound having hydrogen or an organic group attached to the silicon or oxygen, e.g. a siloxane
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02282—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process liquid deposition, e.g. spin-coating, sol-gel techniques, spray coating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31105—Etching inorganic layers
- H01L21/31111—Etching inorganic layers by chemical means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31105—Etching inorganic layers
- H01L21/31111—Etching inorganic layers by chemical means
- H01L21/31116—Etching inorganic layers by chemical means by dry-etching
Definitions
- the present invention relates to a composition for forming a lower layer film between a substrate used for manufacturing a semiconductor device and a resist (for example, a photoresist or an electron beam resist). More specifically, the present invention relates to a resist underlayer film forming composition for lithography for forming an underlayer film used as a lower layer of a photoresist in a lithography process for manufacturing a semiconductor device. Moreover, it is related with the formation method of the resist pattern using the said lower layer film formation composition.
- microfabrication by lithography using a photoresist has been performed in the manufacture of semiconductor devices.
- the microfabrication is obtained by forming a thin film of photoresist on a semiconductor substrate such as a silicon wafer, irradiating it with an actinic ray such as ultraviolet rays through a mask pattern on which a semiconductor device pattern is drawn, and developing it.
- an actinic ray such as ultraviolet rays
- fine irregularities corresponding to the pattern are formed on the substrate surface by etching the substrate using the photoresist pattern as a protective film.
- a film known as a hard mask containing a metal element such as silicon or titanium is used as a lower layer film between the semiconductor substrate and the photoresist.
- the rate of removal by dry etching largely depends on the type of gas used for dry etching.
- the gas type it is possible to remove the hard mask by dry etching without greatly reducing the thickness of the photoresist.
- a resist underlayer film has been arranged between a semiconductor substrate and a photoresist in order to achieve various effects including an antireflection effect.
- a resist underlayer film forming composition was obtained by adding acetic acid to polysiloxane obtained by hydrolyzing and condensing 3,4 epoxycyclohexylethyltrimethoxysilane and phenyltrimethoxysilane in the presence of an alkaline catalyst ( Example of Patent Document 1).
- Tetramethoxysilane, phenyltrimethoxysilane, and 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane are mixed in ethanol containing an aqueous methanesulfonic acid solution, and hydrolyzed to produce a polysiloxane. It is disclosed that a resist underlayer film forming composition was obtained (Example of Patent Document 2).
- An object of the present invention is to provide a resist underlayer film forming composition for lithography that can be used in the manufacture of semiconductor devices. Specifically, it is to provide a resist underlayer film forming composition for lithography for forming a resist underlayer film that can be used as a hard mask. Moreover, it is providing the resist underlayer film forming composition for lithography for forming the resist underlayer film which can be used as an antireflection film. Another object of the present invention is to provide a resist underlayer film for lithography that does not cause intermixing with the resist and has a higher dry etching rate than the resist, and a resist underlayer film forming composition for forming the underlayer film.
- the present invention forms a resist underlayer film that can form an excellent resist pattern shape when an upper layer resist is exposed and developed with an alkali developer or an organic solvent, and a rectangular resist pattern can be transferred to the lower layer by subsequent dry etching.
- An object of the present invention is to provide a resist underlayer film forming composition.
- the present invention is a wet method using a chemical solution, particularly SPM (sulfuric acid and sulfuric acid).
- An object of the present invention is to provide a silicon-containing resist underlayer film that can be removed with a mixed aqueous solution of hydrogen peroxide.
- the present invention is a resist underlayer film forming composition
- a hydrolytic condensate containing an organic group having a dihydroxy group The dihydroxy group in the hydrolysis condensate containing an organic group having a dihydroxy group is generated by a ring-opening reaction of the epoxy group in the hydrolysis condensate containing an organic group having an epoxy group with an inorganic acid or a cation exchange resin.
- the hydrolysis condensate containing an organic group having an epoxy group is based on an aqueous alkaline substance solution of a hydrolyzable silane containing 10 to 90 mol% of a hydrolyzable silane having an epoxy group based on the total hydrolyzable silane.
- a resist underlayer film forming composition which is a hydrolysis-condensation product
- the hydrolyzable silane containing the epoxy group-containing hydrolyzable silane in a proportion of 10 to 90 mol% based on the total hydrolyzable silane is represented by the formula (1):
- R 1 is a cyclohexyl epoxy group, a glycidoxyalkyl group, or an organic group containing them, and is bonded to a silicon atom by a Si—C bond.
- R 2 is an alkyl group, Aryl, halogenated alkyl, halogenated aryl, alkoxyaryl, alkenyl, acyloxyalkyl, or acryloyl, methacryloyl, mercapto, amino, amide, hydroxyl, alkoxy, ester, sulfonyl
- R 3 represents an alkoxy group, an acyloxy group, or a halogen group, and is an organic group having a group, a cyano group, or a combination thereof, and bonded to a silicon atom by a Si—C bond.
- b represents an integer of 0 to 2
- a + b represents an integer of 1 to 3.
- the resist underlayer film forming composition according to the first aspect comprising a solution silane,
- a hydrolyzable silane containing the above-mentioned hydrolyzable silane having an epoxy group in a proportion of 10 to 90 mol% based on the total hydrolyzable silane is further added to the hydrolyzable silane of the formula (1).
- R 4 is an alkyl group, aryl group, halogenated alkyl group, halogenated aryl group, alkoxyaryl group, alkenyl group, acyloxyalkyl group, or acryloyl group, methacryloyl group, mercapto group, amino group, An organic group having an amide group, a hydroxyl group, an alkoxy group, an ester group, a sulfonyl group, or a cyano group, or a combination thereof, and bonded to a silicon atom by a Si—C bond, and R 5 represents an alkoxy group , An acyloxy group, or a halogen group, c represents an integer of 0 to 3, and formula (3): (In the formula (3), R 6 is an alkyl group and bonded to a silicon atom by a Si—C bond, R 7 represents an alkoxy group, an acyloxy group, or a halogen group, and Y represents
- an epoxy group having an epoxy group is obtained from a hydrolyzable silane containing an epoxy group-containing hydrolyzable silane in a proportion of 10 to 90 mol% based on the total hydrolyzable silane by hydrolytic condensation with an alkaline substance aqueous solution.
- the epoxy group is further opened by an inorganic acid or a cation exchange resin, and a dihydroxy group
- a step of applying the resist underlayer film forming composition according to any one of the first aspect to the eighth aspect on a semiconductor substrate and baking to form a resist underlayer film, on the underlayer film A step of applying a resist composition to form a resist film, a step of exposing the resist film, a step of developing the resist after exposure to obtain a resist pattern, a step of etching the resist underlayer film according to the resist pattern, and a pattern
- a method of manufacturing a semiconductor device including a step of processing a semiconductor substrate with a resist and
- the present invention contains a hydrolytic condensate (polysiloxane) containing an organic group having a dihydroxy group by a ring-opening reaction of an epoxy group in a resist underlayer film forming composition.
- a dihydroxy group is formed by a ring-opening reaction of an epoxy group.
- an organic acid residue undergoes an addition reaction during the ring-opening reaction of the epoxy group, and a dihydroxy structure cannot be formed.
- an acid is used during hydrolysis of the hydrolyzable silane, the ring opening of the epoxy group occurs simultaneously, and a side reaction between the silanol group and the dihydroxyl group also occurs.
- the present invention contains an aqueous alkaline substance in an organic solvent during hydrolysis of the hydrolyzable silane, prioritizing the formation of silanol groups, forming a polysiloxane, and then adding an inorganic acid to convert the epoxy groups to dihydroxy groups.
- a resist underlayer film forming composition containing polysiloxane containing an organic group having a dihydroxy group is obtained.
- Co-hydrolyzed condensate of tetrafunctional silane such as tetraethoxysilane and trifunctional silane having an organic group is a resist composition in which a resist underlayer film is mainly overcoated by forming a crosslinked structure between silanol groups.
- a chemical solution such as SPM (mixed aqueous solution of sulfuric acid and hydrogen peroxide solution) after the lower layer or substrate is processed after that, The resist underlayer film could not be removed.
- a dihydroxyl group by ring opening of an epoxy group forms a crosslinked structure between dihydroxyl groups, between a dihydroxyl group and a silanol group, or between a dihydroxyl group and an organic crosslinkable compound. Therefore, intermixing does not occur due to the resist composition overcoated on the resist underlayer film of the present application, and it can be removed with SPM (mixed aqueous solution of sulfuric acid and hydrogen peroxide solution) after processing the lower layer after that. It becomes.
- SPM mixed aqueous solution of sulfuric acid and hydrogen peroxide solution
- the resist underlayer film of the present invention has a siloxane unit structure having an organic group having a dihydroxy group, and the crosslinked structure by this unit structure is a wet method using a chemical solution, particularly SPM (mixed sulfuric acid and hydrogen peroxide solution).
- SPM mixed sulfuric acid and hydrogen peroxide solution
- the present invention is a resist underlayer film-forming composition
- a hydrolytic condensate containing an organic group having a dihydroxy group The dihydroxy group in the hydrolysis condensate containing an organic group having a dihydroxy group is generated by a ring-opening reaction of the epoxy group in the hydrolysis condensate containing an organic group having an epoxy group with an inorganic acid or a cation exchange resin.
- the hydrolysis condensate containing an organic group having an epoxy group is based on an aqueous alkaline substance solution of a hydrolyzable silane containing 10 to 90 mol% of a hydrolyzable silane having an epoxy group based on the total hydrolyzable silane. It is a resist underlayer film forming composition which is a hydrolysis condensate.
- the hydrolyzable silane having an epoxy group is less than 10 mol% based on the total hydrolyzable silane, sufficient intermixing property for the topcoat resist composition cannot be ensured. Intermixing is an undesirable phenomenon because the lower layer film dissolves when the upper layer composition is applied onto the lower layer film, and the lower layer film and the upper layer composition cause layer mixing.
- an organic group having an epoxy group is obtained by hydrolytic condensation with an alkaline substance aqueous solution.
- An organic compound having a dihydroxy group by further opening the epoxy group with an inorganic acid or a cation exchange resin in a reaction system including a step of obtaining a hydrolyzed condensate containing and a hydrolyzed condensate containing an organic group having the epoxy group. And a step of obtaining a hydrolysis-condensation product containing a group.
- Hydrolysis of hydrolyzable silane with an alkaline substance aqueous solution and subsequent ring opening reaction of an epoxy group with an inorganic acid or cation exchange resin of the hydrolysis condensate can be performed in an organic solvent.
- the reaction system containing a hydrolysis-condensation product is a reaction system in which hydrolysis and condensation of silane are performed, and a ring-opening reaction of an epoxy group is subsequently performed.
- the resist underlayer film forming composition of the present invention contains the hydrolysis condensate and a solvent.
- acid water, alcohol, curing catalyst, acid generator, other organic polymer, light-absorbing compound, surfactant and the like can be included.
- the solid content in the resist underlayer film forming composition of the present invention is, for example, 0.1 to 50% by mass, or 0.1 to 30% by mass, and 0.1 to 25% by mass.
- the solid content is obtained by removing the solvent component from all the components of the resist underlayer film forming composition.
- the proportion of the hydrolyzable silane, its hydrolyzate, and its hydrolysis condensate in the solid content is 20% by mass or more, for example, 50 to 100% by mass, 60 to 99% by mass, 70 to 99% by mass. It is.
- the hydrolysis condensate is composed of a hydrolyzable silane, a hydrolyzate, and a partial hydrolyzate that is not completely hydrolyzed when the hydrolysis condensate is obtained. It can also be used.
- This condensate is a polymer having a polysiloxane structure.
- a hydrolyzable silane of the formula (1) can be used as the hydrolyzable silane.
- R 1 is a cyclohexyl epoxy group, a glycidoxyalkyl group, or an organic group containing them, and is bonded to a silicon atom by a Si—C bond.
- R 2 is in the formula (1), R 1 are those bonded silicon atom through a Si-C bond is an organic group containing cyclohexyl epoxy groups, glycidoxy group, or them.
- R 2 is an alkyl group, aryl group, halogenated alkyl group, halogenated aryl group, alkoxyaryl group, alkenyl group, acyloxyalkyl group, or acryloyl group, methacryloyl group, mercapto group, amino group, amide group, hydroxyl group, alkoxy
- R 3 represents an alkoxy group, an acyloxy group, or a halogen group.
- a represents an integer of 1
- b represents an integer of 0 to 2
- a + b represents an integer of 1 to 3.
- the alkyl group is a linear or branched alkyl group having 1 to 10 carbon atoms, such as a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, s-butyl, t-butyl, n-pentyl, 1-methyl-n-butyl, 2-methyl-n-butyl, 3-methyl-n-butyl, 1,1-dimethyl-n- Propyl group, 1,2-dimethyl-n-propyl group, 2,2-dimethyl-n-propyl group, 1-ethyl-n-propyl group, n-hexyl, 1-methyl-n-pentyl group, 2-methyl -N-pentyl group, 3-methyl-n-pentyl group, 4-methyl-n-pentyl group, 1,1-dimethyl-n-butyl group, 1,2-dimethyl-n
- a cyclic alkyl group can also be used.
- a cyclic alkyl group having 1 to 10 carbon atoms a cyclopropyl group, a cyclobutyl group, a 1-methyl-cyclopropyl group, a 2-methyl-cyclopropyl group, a cyclopentyl group, 1-methyl-cyclobutyl group, 2-methyl-cyclobutyl group, 3-methyl-cyclobutyl group, 1,2-dimethyl-cyclopropyl group, 2,3-dimethyl-cyclopropyl group, 1-ethyl-cyclopropyl group, 2 -Ethyl-cyclopropyl group, cyclohexyl group, 1-methyl-cyclopentyl group, 2-methyl-cyclopentyl group, 3-methyl-cyclopentyl group, 1-ethyl-cyclobutyl group, 2-ethyl-cyclobutyl group, 3-ethyl-cyclobutyl Group, 1,2-d
- the alkenyl group is an alkenyl group having 2 to 10 carbon atoms, such as an ethenyl group, a 1-propenyl group, a 2-propenyl group, a 1-methyl-1-ethenyl group, a 1-butenyl group, a 2-butenyl group, and a 3-butenyl group.
- aryl group examples include aryl groups having 6 to 40 carbon atoms, such as a phenyl group, o-methylphenyl group, m-methylphenyl group, p-methylphenyl group, o-chlorophenyl group, m-chlorophenyl group, p-chlorophenyl group, o-fluorophenyl group, p-mercaptophenyl group, o-methoxyphenyl group, p-methoxyphenyl group, p-aminophenyl group, p-cyanophenyl group, ⁇ -naphthyl group, ⁇ -naphthyl Group, o-biphenylyl group, m-biphenylyl group, p-biphenylyl group, 1-anthryl group, 2-anthryl group, 9-anthryl group, 1-phenanthryl group, 2-phenanthryl group, 3-phenanthryl group, 4-phen
- acyloxyalkyl group examples include the combination of the above-described acyloxy group and alkyl group, and examples thereof include an acetoxymethyl group, an acetoxyethyl group, an acetoxypropyl group, and the like.
- organic group having an epoxy group examples include glycidoxymethyl, glycidoxyethyl, glycidoxypropyl, glycidoxybutyl, and epoxycyclohexyl.
- Examples of the organic group having an acryloyl group include acryloylmethyl, acryloylethyl, acryloylpropyl, and the like.
- Examples of the organic group having a methacryloyl group include methacryloylmethyl, methacryloylethyl, methacryloylpropyl, and the like.
- Examples of the organic group having a mercapto group include ethyl mercapto, butyl mercapto, hexyl mercapto and octyl mercapto.
- Examples of the organic group having an amino group include an amino group, an aminomethyl group, and an aminoethyl group.
- Examples of the organic group having a cyano group include cyanoethyl and cyanopropyl.
- organic groups having amino groups or amide groups include cyanuric acid derivatives.
- Examples of the organic group having a hydroxyl group include a hydroxyphenyl group bonded to an aryl group.
- Examples of the organic group having a sulfonyl group include a sulfonylalkyl group and a sulfonylaryl group.
- the alkoxyalkyl group is an alkyl group substituted by an alkoxy group, and examples thereof include a methoxymethyl group, an ethoxymethyl group, an ethoxyethyl group, and an ethoxymethyl group.
- alkoxy group having 1 to 20 carbon atoms examples include alkoxy groups having a linear, branched, and cyclic alkyl moiety having 1 to 20 carbon atoms, such as a methoxy group, an ethoxy group, an n-propoxy group, and an i-propoxy group.
- acyloxy group having 2 to 20 carbon atoms examples include methylcarbonyloxy group, ethylcarbonyloxy group, n-propylcarbonyloxy group, i-propylcarbonyloxy group, n-butylcarbonyloxy group, i-butylcarbonyloxy group, s-butylcarbonyloxy group, t-butylcarbonyloxy group, n-pentylcarbonyloxy group, 1-methyl-n-butylcarbonyloxy group, 2-methyl-n-butylcarbonyloxy group, 3-methyl-n-butyl Carbonyloxy group, 1,1-dimethyl-n-propylcarbonyloxy group, 1,2-dimethyl-n-propylcarbonyloxy group, 2,2-dimethyl-n-propylcarbonyloxy group, 1-ethyl-n-propyl Carbonyloxy group, n-hexylcarbonyloxy group, 1-methyl -N-pentyl
- halogen group examples include fluorine, chlorine, bromine and iodine.
- Examples of the hydrolyzable silane represented by the above formula (1) are as follows.
- T is an alkyl group, and examples of the alkyl group described above can be given, and for example, a methyl group and an ethyl group are preferable.
- the hydrolyzable silane can be used in combination with the hydrolyzable silane of the formula (1) and other hydrolyzable silanes, and the other hydrolyzable silanes are derived from the formulas (2) and (3). At least one hydrolyzable silane selected from the group can be used.
- the hydrolyzable silane of the formula (1) is 10 to 90 mol% based on the total hydrolyzable silane, or 15 to It can be contained in the range of 85 mol%, or 20 to 80 mol%, or 20 to 60 mol%.
- R 4 represents an alkyl group, aryl group, halogenated alkyl group, halogenated aryl group, alkoxyaryl group, alkenyl group, acyloxyalkyl group, or acryloyl group, methacryloyl group, mercapto group, amino group, amide
- R 5 is an alkoxy group, An acyloxy group or a halogen group, and c represents an integer of 0 to 3;
- R 6 is an alkyl group and bonded to a silicon atom by a Si—C bond
- R 7 represents an alkoxy group, an acyloxy group, or a halogen group
- Y represents an alkylene group or an arylene group Represents a group
- d represents an integer of 0 or 1
- e represents an integer of 0 or 1.
- Examples of the organic group, alkoxy group, acyloxy group, and halogen group having a group, a sulfonyl group, or a cyano group can include the above-mentioned examples.
- formula (2) examples include tetramethoxysilane, tetrachlorosilane, tetraacetoxysilane, tetraethoxysilane, tetra n-propoxysilane, tetraisopropoxysilane, tetra n-butoxysilane, tetraacetoxysilane, methyltrimethoxysilane.
- Methyltrichlorosilane methyltriacetoxysilane, methyltripropoxysilane, methyltriacetoxysilane, methyltributoxysilane, methyltripropoxysilane, methyltriamyloxysilane, methyltriphenoxysilane, methyltribenzyloxysilane, methyltri Phenethyloxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, vinyltrimethoxysilane, vinyltrichlorosilane, vinyltriacetoxysilane, vinyl Riethoxysilane, vinyltriacetoxysilane, methoxyphenyltrimethoxysilane, methoxyphenyltriethoxysilane, methoxyphenyltriacetoxysilane, methoxyphenyltrichlorosilane, methoxybenzyltrimethoxysilane, methoxybenzyltrie
- formula (3) examples include methylene bistrimethoxysilane, methylene bistrichlorosilane, methylene bistriacetoxy silane, ethylene bistriethoxysilane, ethylene bistrichlorosilane, ethylene bistriacetoxy silane, propylene bistriethoxysilane, butylene bistrimethoxysilane, phenylene bistri.
- Examples include methoxysilane, phenylenebistriethoxysilane, phenylenebismethyldiethoxysilane, phenylenebismethyldimethoxysilane, naphthylenebistrimethoxysilane, bistrimethoxydisilane, bistriethoxydisilane, bisethyldiethoxydisilane, and bismethyldimethoxydisilane.
- silane of Formula (2) can also illustrate the following silanes.
- T is an alkyl group, and examples of the above-mentioned alkyl group can be given.
- a methyl group and an ethyl group are preferable.
- R is exemplified below.
- acyloxy group, block hydroxyl group, and alkoxyalkoxyalkyl group can generate carboxylic acid and hydroxyl group by hydrolysis of inorganic acid.
- hydrolysis-condensation product used for this invention can be illustrated below, for example.
- the above hydrolyzable silane hydrolysis condensate (polyorganosiloxane) can give a condensate having a weight average molecular weight of 1,000 to 1,000,000, or 1,000 to 100,000. These molecular weights are molecular weights obtained in terms of polystyrene by GPC analysis.
- GPC measurement conditions are, for example, GPC apparatus (trade name HLC-8220 GPC, manufactured by Tosoh Corporation), GPC column (trade names Shodex KF803L, KF802, KF801, Showa Denko), column temperature is 40 ° C., and eluent (elution solvent) Is tetrahydrofuran, the flow rate (flow rate) is 1.0 ml / min, and the standard sample is polystyrene (manufactured by Showa Denko KK).
- hydrolysis of the alkoxysilyl group, acyloxysilyl group, or halogenated silyl group 0.5 to 100 mol, preferably 1 to 10 mol of water is used per mol of the hydrolyzable group. Further, 0.001 to 10 mol, preferably 0.001 to 1 mol of hydrolysis catalyst can be used per mol of hydrolyzable group.
- the reaction temperature for the hydrolysis and condensation is usually 20 to 80 ° C. Hydrolysis may be performed completely or partially. That is, a hydrolyzate or a monomer may remain in the hydrolysis condensate.
- a catalyst can be used in the hydrolysis and condensation.
- a hydrolysis catalyst it is alkaline substance aqueous solution, An organic base and an inorganic base can be mentioned as an alkaline substance.
- Organic bases as hydrolysis catalysts include, for example, pyridine, pyrrole, piperazine, pyrrolidine, piperidine, picoline, trimethylamine, triethylamine, monoethanolamine, diethanolamine, dimethylmonoethanolamine, monomethyldiethanolamine, triethanolamine, diazabicyclooctane, diazine.
- Examples of the inorganic base include ammonia, sodium hydroxide, potassium hydroxide, barium hydroxide, calcium hydroxide and the like. These may be used alone or in combination of two or more.
- organic solvent used in the hydrolysis examples include n-pentane, i-pentane, n-hexane, i-hexane, n-heptane, i-heptane, 2,2,4-trimethylpentane, n-octane, i- Aliphatic hydrocarbon solvents such as octane, cyclohexane and methylcyclohexane; benzene, toluene, xylene, ethylbenzene, trimethylbenzene, methylethylbenzene, n-propyl benzene, i-propyl benzene, diethylbenzene, i-butylbenzene, triethylbenzene, di -Aromatic hydrocarbon solvents such as i-propyl benzene, n-amyl naphthalene, trimethylbenzene; methanol, ethanol, ethanol
- acetone methyl ethyl ketone, methyl-n-propyl ketone, methyl-n-butyl ketone, diethyl ketone, methyl-i-butyl ketone, methyl-n-pentyl ketone, ethyl-n-butyl ketone, methyl-n-hexyl ketone, di- Ketone solvents such as i-butyl ketone, trimethylnonanone, cyclohexanone, methylcyclohexanone, 2,4-pentanedione, acetonylacetone, diacetone alcohol, acetophenone, and fenchon are preferred from the viewpoint of storage stability of the solution.
- the above hydrolysis condensate further generates a dihydroxyl group by opening an epoxy group with an inorganic acid or a cation exchange resin.
- This inorganic acid can be added as an aqueous inorganic acid solution.
- the concentration of the inorganic acid aqueous solution can be used at a concentration of about 0.01 M to 10 M, for example.
- examples of inorganic acids include hydrochloric acid, nitric acid, sulfuric acid, hydrofluoric acid, and phosphoric acid.
- examples of the cation exchange resin include strongly acidic cation resins (for example, sulfonic acid type ion exchange resins) and weakly acidic cation resins (for example, carboxylic acid type ion exchange resins).
- the inorganic acid and the proton of the cation exchange resin function as a catalyst in the ring-opening reaction of the epoxy group.
- hydrolysis and condensation reaction with an aqueous alkaline substance solution is performed, and the inorganic acid or cation exchange resin is added to the reaction system containing the hydrolysis condensate, so that the inorganic acid or cation exchange resin neutralizes the remaining alkaline substance. May be consumed.
- the proton used for the ring-opening reaction of the epoxy group generates a dihydroxy group by adding 0.01 to 100 mol% of the proton with respect to the epoxy group. Also, it can be added in a proportion of 0.01 to 1000 mol%, or 0.01 to 500 mol%, 0.01 to 300 mol%, 0.01 to 100 mol%.
- an anion exchange resin can be used in order to remove an anion.
- a strongly basic anion exchange resin for example, quaternary ammonium type ion exchange resin
- a weakly basic anion exchange resin for example, polyamine type ion exchange resin
- the cation exchange resin and the anion exchange resin can be easily removed from the reaction system by filtration.
- a crosslinkable compound can be further contained.
- the crosslinkable compound used in the present invention can be a crosslinkable compound having a ring structure having an alkoxymethyl group or a hydroxymethyl group, or a crosslinkable compound having a blocked isocyanate group.
- a methoxymethyl group can be preferably used as the alkoxymethyl group.
- crosslinkable compound examples include melamine type, substituted urea type, and polymer type thereof.
- a cross-linking agent having at least two cross-linking substituents, methoxymethylated glycoluril, butoxymethylated glycoluril, methoxymethylated melamine, butoxymethylated melamine, methoxymethylated benzogwanamine, butoxymethylated benzogwanamine, methoxy Compounds such as methylated urea, butoxymethylated urea, methoxymethylated thiourea, or methoxymethylated thiourea.
- the condensate of these compounds can also be used.
- Tetramethoxymethylglycoluril is available from Mitsui Cytec Co., Ltd. as Powder Link 1174 (PL-LI).
- crosslinking agent a crosslinking agent having high heat resistance
- a compound containing a crosslinking-forming substituent having an aromatic ring (for example, a benzene ring or a naphthalene ring) in the molecule can be preferably used.
- this compound examples include a compound having a partial structure of the following formula (4) and a polymer or oligomer having a repeating unit of the following formula (5).
- R 11 and R 12 are each a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or an aryl group having 6 to 20 carbon atoms, n1 is an integer of 1 to 4, and n2 is 1 Is an integer of (5-n1), and n1 + n2 is an integer of 2 to 5.
- R 13 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms
- R 14 is an alkyl group having 1 to 10 carbon atoms
- n3 is an integer of 1 to 4
- n4 is 0 (4-n3)
- n3 + n4 represents an integer of 1 to 4.
- Oligomers and polymers can be used in the range of 2 to 100 or 2 to 50 repeating unit structures.
- the above compounds can be obtained as products of Asahi Organic Materials Industry Co., Ltd. and Honshu Chemical Industry Co., Ltd.
- the compound of the formula (4-21) can be obtained as Asahi Organic Materials Co., Ltd., trade name TM-BIP-A.
- the compound of the formula (4-22) can be obtained as Honshu Chemical Industry Co., Ltd., trade name TMOM-BP.
- the addition amount of the crosslinkable compound varies depending on the coating solvent to be used, the base substrate to be used, the required solution viscosity, the required film shape, etc., but is preferably 0.001 to 80% by mass with respect to the total solid content, preferably Is 0.01 to 50% by mass, more preferably 0.05 to 40% by mass.
- These cross-linking agents may cause a cross-linking reaction by self-condensation, but when a cross-linkable substituent is present in the above-mentioned polymer of the present invention, it can cause a cross-linking reaction with those cross-linkable substituents.
- the resist underlayer film forming composition used in the present invention may contain an acid (acidic compound) for promoting the crosslinking reaction.
- the acid (acidic compound) is camphorsulfonic acid, citric acid, p-toluenesulfonic acid, pyridinium-p-toluenesulfonic acid, trifluoromethanesulfonic acid, salicylic acid, sulfosalicylic acid, pyridinium-sulfosalicylic acid, 4-chlorobenzenesulfonic acid, pyridinium -4-chlorobenzenesulfonic acid, 4-hydroxybenzenesulfonic acid, pyridinium-4-hydroxybenzenesulfonic acid, benzenedisulfonic acid, pyridinium-benzenedisulfonic acid, benzoic acid, hydroxybenzoic acid, 1-naphthalenesulfonic acid, and pyridinium-1 -Naphthalenesul
- the acid (acidic compound) is 0.01 to 10 parts by mass, or 0.05 to 5 parts by mass, or 0.1 to 3 parts by mass, or 0.3 parts per 100 parts by mass of the condensate (polyorganosiloxane) It can be used at ⁇ 2 parts by mass, or 0.5-1 part by mass.
- the resist underlayer film forming composition of the present invention may contain an acid generator.
- the acid generator include a thermal acid generator and a photoacid generator.
- the photoacid generator generates an acid when the resist is exposed. Therefore, the acidity of the lower layer film can be adjusted. This is a method for matching the acidity of the lower layer film with the acidity of the upper layer resist. Further, the pattern shape of the resist formed in the upper layer can be adjusted by adjusting the acidity of the lower layer film.
- Examples of the photoacid generator contained in the resist underlayer film forming composition of the present invention include onium salt compounds, sulfonimide compounds, and disulfonyldiazomethane compounds.
- onium salt compounds include diphenyliodonium hexafluorophosphate, diphenyliodonium trifluoromethanesulfonate, diphenyliodonium nonafluoronormalbutanesulfonate, diphenyliodonium perfluoronormaloctanesulfonate, diphenyliodonium camphorsulfonate, bis (4-tert-butylphenyl) iodonium camphor.
- Iodonium salt compounds such as sulfonate and bis (4-tert-butylphenyl) iodonium trifluoromethanesulfonate, and triphenylsulfonium hexafluoroantimonate, triphenylsulfonium nonafluoronormal butanesulfonate, triphenylsulfonium camphorsulfonate, and triphenyls Sulfonium salt compounds such as phosphonium trifluoromethanesulfonate, and the like.
- sulfonimide compounds include N- (trifluoromethanesulfonyloxy) succinimide, N- (nonafluoronormalbutanesulfonyloxy) succinimide, N- (camphorsulfonyloxy) succinimide and N- (trifluoromethanesulfonyloxy) naphthalimide. Can be mentioned.
- disulfonyldiazomethane compound examples include bis (trifluoromethylsulfonyl) diazomethane, bis (cyclohexylsulfonyl) diazomethane, bis (phenylsulfonyl) diazomethane, bis (p-toluenesulfonyl) diazomethane, and bis (2,4-dimethylbenzenesulfonyl). And diazomethane, and methylsulfonyl-p-toluenesulfonyldiazomethane.
- photoacid generator Only one type of photoacid generator can be used, or two or more types can be used in combination.
- the proportion thereof is 0.01 to 5 parts by mass, or 0.1 to 3 parts by mass, or 0.5 with respect to 100 parts by mass of the condensate (polyorganosiloxane). ⁇ 1 part by mass.
- the resist underlayer film forming composition of the present invention may contain a surfactant.
- the surfactant is effective in suppressing the occurrence of pinholes and installations when the resist underlayer film forming composition of the present invention is applied to a substrate.
- Examples of the surfactant contained in the resist underlayer film forming composition of the present invention include polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether, and polyoxyethylene oleyl ether.
- Fluorine-based surfactants and organosiloxane polymer -KP341 (manufactured by Shin-Etsu Chemical Co.) and the like. These surfactants may be used alone or in combination of two or more. When a surfactant is used, the ratio is 0.0001 to 5 parts by mass, or 0.001 to 1 part by mass, or 0.01 to 0 with respect to 100 parts by mass of the condensate (polyorganosiloxane). .5 parts by mass.
- a rheology adjusting agent, an adhesion aid and the like can be added to the resist underlayer film forming composition of the present invention.
- the rheology modifier is effective for improving the fluidity of the underlayer film forming composition.
- the adhesion aid is effective for improving the adhesion between the semiconductor substrate or resist and the lower layer film.
- bisphenol S or a bisphenol S derivative can be added as an additive to the resist underlayer film forming composition of the present invention.
- Bisphenol S or a bisphenol S derivative is 0.01 to 20 parts by mass, 0.01 to 10 parts by mass, or 0.01 to 5 parts by mass with respect to 100 parts by mass of the polyorganosiloxane.
- Preferred bisphenol S or bisphenol S derivatives are exemplified below.
- the solvent used in the resist underlayer film forming composition of the present invention can be used without particular limitation as long as it is a solvent that can dissolve the solid content.
- solvents include methyl cellosolve acetate, ethyl cellosolve acetate, propylene glycol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, methyl isobutyl carbinol, propylene glycol monobutyl ether, propylene glycol monomethyl ether acetate, propylene glycol mono Ether ether acetate, propylene glycol monopropyl ether acetate, propylene glycol monobutyl ether acetate, toluene, xylene, methyl ethyl ketone, cyclopentanone, cyclohexanone, ethyl 2-hydroxypropionate, ethyl 2-hydroxy-2-methylpropionate, ethyl ethoxyacetate , Ethyl
- the resist underlayer film forming composition of the present invention is applied by an appropriate application method such as a spinner or a coater, and then baked to form a resist underlayer film.
- the conditions for firing are appropriately selected from firing temperatures of 80 ° C. to 250 ° C. and firing times of 0.3 to 60 minutes.
- the firing temperature is 150 ° C.
- the thickness of the lower layer film to be formed is, for example, 10 to 1000 nm, 20 to 500 nm, 30 to 300 nm, or 50 to 100 nm.
- a photoresist layer is formed on the resist underlayer film. Formation of the photoresist layer can be performed by a well-known method, that is, by applying a photoresist composition solution onto the lower layer film and baking.
- the film thickness of the photoresist is, for example, 50 to 10,000 nm, 100 to 2000 nm, or 200 to 1000 nm.
- the resist underlayer film of the present invention can be formed thereon, and a photoresist can be further coated thereon.
- the pattern width of the photoresist is narrowed, and even when the photoresist is thinly coated to prevent pattern collapse, the substrate can be processed by selecting an appropriate etching gas.
- the resist underlayer film of the present invention can be processed into a resist underlayer film of the present invention using a fluorine-based gas that has a sufficiently high etching rate for photoresist as an etching gas, and the etching underspeed is sufficiently high for the resist underlayer film of the present invention
- the organic underlayer film can be processed using an oxygen-based gas as an etching gas
- the substrate can be processed using a fluorine-based gas that provides a sufficiently high etching rate for the organic underlayer film as an etching gas.
- the photoresist formed on the resist underlayer film of the present invention is not particularly limited as long as it is sensitive to light used for exposure. Either a negative photoresist or a positive photoresist can be used.
- a positive photoresist comprising a novolac resin and 1,2-naphthoquinonediazide sulfonic acid ester, a chemically amplified photoresist comprising a binder having a group that decomposes with an acid to increase the alkali dissolution rate and a photoacid generator, an acid
- a chemically amplified photoresist comprising a low-molecular compound that decomposes to increase the alkali dissolution rate of the photoresist, an alkali-soluble binder, and a photoacid generator, and a binder having a group that decomposes with an acid to increase the alkali dissolution rate
- a chemically amplified photoresist composed of a low molecular weight compound that de
- Examples include trade name APEX-E manufactured by Shipley, trade name PAR710 manufactured by Sumitomo Chemical Co., Ltd., and trade name SEPR430 manufactured by Shin-Etsu Chemical Co., Ltd. Also, for example, Proc. SPIE, Vol. 3999, 330-334 (2000), Proc. SPIE, Vol. 3999, 357-364 (2000), Proc. SPIE, Vol. 3999, 365-374 (2000), and fluorine-containing polymer-based photoresists.
- post-exposure heating is performed as necessary.
- the post-exposure heating is performed under conditions appropriately selected from a heating temperature of 70 ° C. to 150 ° C. and a heating time of 0.3 to 10 minutes.
- a resist for electron beam lithography or a resist for EUV lithography can be used instead of a photoresist as a resist.
- the electron beam resist either a negative type or a positive type can be used.
- Chemically amplified resist comprising a binder having a group that decomposes with an acid generator and an acid to change the alkali dissolution rate, a low molecular weight compound that decomposes with an alkali-soluble binder, an acid generator and an acid to change the alkali dissolution rate of the resist
- a chemically amplified resist comprising: a binder having a group that decomposes with an acid generator and an acid to change the alkali dissolution rate; and a chemically amplified resist comprising a low-molecular compound that decomposes with an acid to change the alkali dissolution rate of the resist,
- non-chemically amplified resists composed of a binder having a group that changes the alkali dissolution rate by being
- a developer for example, an alkali developer.
- a developer for example, an alkali developer.
- Developers include aqueous solutions of alkali metal hydroxides such as potassium hydroxide and sodium hydroxide, aqueous solutions of quaternary ammonium hydroxides such as tetramethylammonium hydroxide, tetraethylammonium hydroxide and choline, ethanolamine, propylamine, An alkaline aqueous solution such as an aqueous amine solution such as ethylenediamine can be mentioned as an example. Further, a surfactant or the like can be added to these developers.
- the development conditions are appropriately selected from a temperature of 5 to 50 ° C. and a time of 10 to 600 seconds.
- an organic solvent can be used as a developer. After the exposure, development is performed with a developer (solvent). As a result, for example, when a positive photoresist is used, the unexposed portion of the photoresist is removed, and a photoresist pattern is formed.
- Developers include, for example, methyl acetate, butyl acetate, ethyl acetate, isopropyl acetate, amyl acetate, isoamyl acetate, ethyl methoxyacetate, ethyl ethoxy acetate, propylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monopropyl Ether acetate, ethylene glycol monobutyl ether acetate, ethylene glycol monophenyl ether acetate, diethylene glycol monomethyl ether acetate, diethylene glycol monopropyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monophenyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol Monoethyl ether acetate, 2-methoxybutyl acetate, 3-methoxybutyl acetate,
- the resist underlayer film (intermediate layer) of the present invention is removed using the photoresist (upper layer) pattern thus formed as a protective film, and then the patterned photoresist and the resist underlayer film of the present invention are removed.
- the organic underlayer film (lower layer) is removed using the film made of (intermediate layer) as a protective film.
- the semiconductor substrate is processed using the patterned resist underlayer film (intermediate layer) and organic underlayer film (lower layer) of the present invention as a protective film.
- the resist underlayer film (intermediate layer) of the present invention in a portion where the photoresist has been removed is removed by dry etching to expose the semiconductor substrate.
- dry etching of the resist underlayer film of the present invention tetrafluoromethane (CF 4 ), perfluorocyclobutane (C 4 F 8 ), perfluoropropane (C 3 F 8 ), trifluoromethane, carbon monoxide, argon, oxygen, Gases such as nitrogen, sulfur hexafluoride, difluoromethane, nitrogen trifluoride and chlorine trifluoride, chlorine, trichloroborane and dichloroborane can be used.
- a halogen-based gas for dry etching of the resist underlayer film.
- a photoresist made of an organic substance is basically difficult to remove.
- the resist underlayer film of the present invention containing a large amount of silicon atoms is quickly removed by the halogen-based gas. Therefore, it is possible to suppress a decrease in the thickness of the photoresist accompanying dry etching of the resist underlayer film. As a result, the photoresist can be used as a thin film.
- the dry etching of the resist underlayer film is preferably performed using a fluorine-based gas.
- fluorine-based gas examples include tetrafluoromethane (CF 4 ), perfluorocyclobutane (C 4 F 8 ), and perfluoropropane (C 3 F 8 ). , Trifluoromethane, and difluoromethane (CH 2 F 2 ).
- the organic underlayer film is removed using the patterned photoresist and the film made of the resist underlayer film of the present invention as a protective film.
- the organic underlayer film (underlayer) is preferably formed by dry etching with an oxygen-based gas. This is because the resist underlayer film of the present invention containing a large amount of silicon atoms is difficult to remove by dry etching with an oxygen-based gas.
- the semiconductor substrate is processed. The processing of the semiconductor substrate is preferably performed by dry etching with a fluorine-based gas.
- dry etching or wet etching is often performed.
- dry etching of the resist underlayer film (intermediate layer) is preferably performed using a fluorine-based gas.
- fluorine-based gases include tetrafluoromethane (CF 4 ), perfluorocyclobutane (C 4 F 8 ), perfluoropropane (C 3 F 8 ), trifluoromethane, and difluoromethane (CH 2 F 2 ). It is done.
- Examples of the chemical solution used in wet etching of the resist underlayer film (intermediate layer) include chemical solutions such as hydrofluoric acid, buffered hydrofluoric acid, sulfuric acid / hydrogen peroxide solution, and ammonia / hydrogen peroxide solution.
- an organic antireflection film can be formed on the resist underlayer film of the present invention before the formation of the photoresist.
- the antireflective coating composition used there is not particularly limited, and can be arbitrarily selected from those conventionally used in the lithography process, and can be used by a conventional method such as a spinner.
- the antireflection film can be formed by coating and baking with a coater.
- the substrate to which the resist underlayer film forming composition of the present invention is applied may have an organic or inorganic antireflection film formed on its surface by a CVD method or the like.
- the underlayer film of the invention can also be formed.
- the resist underlayer film formed from the resist underlayer film forming composition of the present invention may also absorb light depending on the wavelength of light used in the lithography process. In such a case, it can function as an antireflection film having an effect of preventing reflected light from the substrate. Further, the underlayer film of the present invention has a function for preventing an adverse effect on a substrate of a layer for preventing an interaction between the substrate and the photoresist, a material used for the photoresist or a substance generated upon exposure to the photoresist.
- a layer having a function of preventing diffusion of a substance generated from a substrate upon heating and baking into an upper layer photoresist It is also possible.
- the resist underlayer film formed from the resist underlayer film forming composition is applied to a substrate on which via holes used in the dual damascene process are formed, and can be used as a filling material that can fill the holes without gaps. Moreover, it can also be used as a planarizing material for planarizing the surface of an uneven semiconductor substrate.
- the lower layer film of the EUV resist can be used for the following purposes. Without intermixing with the EUV resist, it is possible to prevent reflection of unwanted exposure light such as UV and DUV (ArF light, KrF light) from the substrate or interface during EUV exposure (wavelength 13.5 nm).
- the resist underlayer film forming composition can be used as a resist underlayer antireflection film. Reflection can be efficiently prevented in the lower layer of the EUV resist.
- the process can be performed in the same manner as the photoresist underlayer film.
- the total hydrolyzable silane contained 60 mol% of cyclohexylepoxyethyltrimethoxysilane. After the addition, the flask was transferred to an oil bath adjusted to 40 ° C. and allowed to react for 240 minutes. Thereafter, 107.59 g of 1M nitric acid was added to the reaction solution, and a cyclohexylepoxy group was opened at 40 ° C. to obtain a hydrolysis condensate having a dihydroxyl group.
- the total hydrolyzable silane contained 60 mol% of cyclohexylepoxyethyltrimethoxysilane. After the addition, the flask was transferred to an oil bath adjusted to 40 ° C. and allowed to react for 240 minutes. Thereafter, 95.70 g of 1M nitric acid was added to the reaction solution, and a cyclohexylepoxy group was opened at 40 ° C. to obtain a hydrolysis-condensation product having a dihydroxyl group.
- Ethoxysilylpropyl diallyl isocyanurate 8.47g, tetraethoxylane 8.53g, glycidoxypropyltrimethoxysilane 9.98g, ethoxyethoxyphenyltrimethoxysilane 5.87g, acetoxymethyltriethoxysilane 19.36g in mixed solution It was dripped. The total hydrolyzable silane contained 20 mol% of glycidoxypropyltrimethoxysilane. After the addition, the flask was transferred to an oil bath adjusted to 40 ° C. and allowed to react for 240 minutes.
- the total hydrolyzable silane contained 20 mol% of cyclohexylepoxyethyltrimethoxysilane. After the addition, the flask was transferred to an oil bath adjusted to 40 ° C. and allowed to react for 240 minutes. Thereafter, 104.89 g of 1M nitric acid was added to the reaction solution, and the cyclohexyl epoxy group was further opened at 40 ° C. to obtain a hydrolysis condensate having a dihydroxyl group.
- propylene glycol monoethyl ether was added, and the solvent ratio of 100% propylene glycol monomethyl ether was adjusted to 20 mass percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponded to Formula (1), the weight average molecular weight by GPC was Mw3000 in polystyrene conversion, and the epoxy value was 0.
- the flask was transferred to an oil bath adjusted to 40 ° C. and allowed to react for 240 minutes. Thereafter, 80.32 g of 1M nitric acid was added to the reaction solution, and the cyclohexyl epoxy group was opened at 40 ° C. to obtain a hydrolysis condensate having a dihydroxyl group. Thereafter, 248.36 g of methyl isobutyl ketone and 124.18 g of water were added, and water, nitric acid, and tetraethylammonium nitrate, which were reaction byproducts transferred to the aqueous layer by the liquid separation operation, were distilled off, and the organic layer was recovered.
- the flask was transferred to an oil bath adjusted to 40 ° C. and allowed to react for 240 minutes. Thereafter, 74.86 g of 1M nitric acid was added to the reaction solution, and a cyclohexylepoxy group was opened at 40 ° C. to obtain a hydrolysis condensate having a dihydroxyl group. Thereafter, 243.70 g of methyl isobutyl ketone and 121.85 g of water were added, and water, nitric acid, and tetraethylammonium nitrate, which were reaction byproducts transferred to the aqueous layer by the liquid separation operation, were distilled off, and the organic layer was recovered.
- the total hydrolyzable silane contained 20 mol% of cyclohexylepoxyethyltrimethoxysilane. After the addition, the flask was transferred to an oil bath adjusted to 40 ° C. and allowed to react for 240 minutes. Thereafter, 74.86 g of 1M nitric acid was added to the reaction solution, and a cyclohexylepoxy group was opened at 40 ° C. to obtain a hydrolysis condensate having a dihydroxyl group.
- the obtained polymer corresponds to the formula (A-13), the weight average molecular weight by GPC was Mw2800 in terms of polystyrene, and the epoxy value was 0.
- the obtained polymer corresponds to the formula (A-15), the weight average molecular weight by GPC was Mw 6000 in terms of polystyrene, and the epoxy value was 0.
- the total hydrolyzable silane contained 60 mol% of cyclohexylepoxyethyltrimethoxysilane. After the addition, the flask was transferred to an oil bath adjusted to 40 ° C. and allowed to react for 240 minutes. Thereafter, 285.52 g of methyl isobutyl ketone and 142.76 g of water were added, and water and tetraethylammonium hydroxide, which were reaction byproducts transferred to the aqueous layer by the liquid separation operation, were distilled off, and the organic layer was recovered.
- the total hydrolyzable silane contained 5 mol% of cyclohexylepoxyethyltrimethoxysilane. After the addition, the flask was transferred to an oil bath adjusted to 40 ° C. and allowed to react for 240 minutes. Then, 1M nitric acid 190.27 was added to the reaction solution, and the cyclohexyl epoxy group was opened at 40 ° C. to obtain a hydrolysis condensate having a dihydroxyl group.
- the total hydrolyzable silane contained 10 mol% of cyclohexylepoxyethyltrimethoxysilane. After the addition, the flask was transferred to an oil bath adjusted to 40 ° C. and allowed to react for 240 minutes. Thereafter, 175.96 g of 1M acetic acid was added to the reaction solution, and the cyclohexyl epoxy group was further opened at 40 ° C. to obtain a hydrolysis-condensation product having an acetoxy group and a monohydroxyl group.
- PPTS represents pyridinium-p-toluenesulfonic acid.
- TAG-2687 is a thermal acid generator (component is an ammonium salt of trifluorosulfonate) manufactured by King Industries.
- the crosslinkable compound PL-LI is a trade name Powder Link 1174 manufactured by Mitsui Cytec Co., Ltd. This is methylglycoluril, which is a crosslinkable compound and trade name TMOM-BP manufactured by Honshu Chemical Industry Co., Ltd. represents a compound of formula (4-22), and Asahi Organic Materials Co., Ltd.
- trade name TM-BIP-A Represents a compound of the formula (4-21)
- PGME represents propylene glycol monomethyl ether
- PGMEA represents propylene glycol monomethyl ether acetate.
- the solution is filtered using a polyethylene microfilter having a pore size of 0.10 ⁇ m, further filtered using a polyethylene microfilter having a pore size of 0.05 ⁇ m, and a solution of an organic underlayer film forming composition used in a lithography process using a multilayer film Was prepared.
- a commercially available resist solution for ArF (trade name: AR2772JN, manufactured by JSR Corporation) was applied onto each B layer with a spinner, heated at 110 ° C. for 1 minute on a hot plate, and a photo film having a film thickness of 120 nm.
- a resist film (C layer) was formed.
- the substrate was baked at 100 ° C. for 60 seconds on a hot plate, cooled, and developed for 60 seconds using an aqueous alkali solution having a concentration of 2.38% by mass to form a positive pattern on the resist underlayer film (B layer).
- the obtained photoresist pattern was evaluated as “good” if it did not cause large pattern peeling, undercut, or line bottom thickening (footing). Those with resist pattern collapse were evaluated as “pattern collapse”.
- a silicon-containing resist underlayer film that is a resist underlayer film that can be used as a hard mask in a lithography process and can be removed by a wet method using a chemical solution, in particular, SPM (mixed aqueous solution of sulfuric acid and hydrogen peroxide solution).
- SPM mixed aqueous solution of sulfuric acid and hydrogen peroxide solution
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Abstract
Description
前記ジヒドロキシ基を有する有機基を含む加水分解縮合物におけるジヒドロキシ基は、エポキシ基を有する有機基を含む加水分解縮合物における該エポキシ基の無機酸又はカチオン交換樹脂による開環反応により生じたものであり、
前記エポキシ基を有する有機基を含む加水分解縮合物は、エポキシ基を有する加水分解性シランを全加水分解性シランに基づいて10~90モル%の割合で含む加水分解性シランのアルカリ性物質水溶液による加水分解縮合物である、レジスト下層膜形成組成物、
第2観点として、上記エポキシ基を有する加水分解性シランを全加水分解性シランに基づいて10~90モル%の割合で含む加水分解性シランが式(1):
第3観点として、上記エポキシ基を有する加水分解性シランを全加水分解性シランに基づいて10~90モル%の割合で含む加水分解性シランが、式(1)の加水分解性シランに更に式(2):
第4観点として、式(1)の加水分解性シランを全加水分解性シランに基づいて10~90モル%の割合で含有している第2観点又は第3観点に記載のレジスト下層膜形成組成物、
第5観点として、更に架橋性化合物を含む第1観点乃至第4観点のいずれか一つに記載のレジスト下層膜形成組成物、
第6観点として、更に酸又は酸発生剤を含む第1観点乃至第5観点のいずれか一つに記載のレジスト下層膜形成組成物、
第7観点として、更に水を含む第1観点乃至第6観点のいずれか一つに記載のレジスト下層膜形成組成物、
第8観点として、前記加水分解性シランのアルカリ性物質水溶液による加水分解縮合物の生成と、前記エポキシ基の無機酸又はカチオン交換樹脂による開環反応が共に有機溶剤中で行われるものである請求項1乃至請求項7のいずれか1項に記載のレジスト下層膜形成組成物、
第9観点として、第1観点乃至第8観点のいずれか一つに記載のレジスト下層膜形成組成物を基板に塗布し焼成後に得られるレジスト下層膜であって、該レジスト下層膜は1:1~4:1のH2SO4/H2O2の質量比を有する硫酸と過酸化水素を含む水溶液で除去可能である上記レジスト下層膜、
第10観点として、エポキシ基を有する加水分解性シランを全加水分解性シランに基づいて10~90モル%の割合で含む加水分解性シランから、アルカリ性物質水溶液による加水分解縮合により、エポキシ基を有する有機基を含む加水分解縮合物を得る工程、及び
該エポキシ基を有する有機基を含む加水分解縮合物を含む反応系で更に無機酸又はカチオン交換樹脂により該エポキシ基を開環して、ジヒドロキシ基を有する有機基を含む加水分解縮合物を得る工程、を含むことを特徴とする請求項1乃至請求項8のいずれか1項に記載のレジスト下層膜形成組成物の製造方法、
第11観点として、第1観点乃至第8観点のいずれか一つに記載のレジスト下層膜形成組成物を半導体基板上に塗布し、焼成しレジスト下層膜を形成する工程、前記下層膜の上にレジスト用組成物を塗布しレジスト膜を形成する工程、前記レジスト膜を露光する工程、露光後にレジストを現像しレジストパターンを得る工程、レジストパターンに従いレジスト下層膜をエッチングする工程、及びパターン化されたレジストとレジスト下層膜により半導体基板を加工する工程を含む半導体装置の製造方法、
第12観点として、半導体基板上に有機下層膜を形成する工程、その上に第1観点乃至第8観点のいずれか一つに記載のレジスト下層膜形成組成物を塗布し焼成しレジスト下層膜を形成する工程、前記レジスト下層膜の上にレジスト用組成物を塗布しレジスト層を形成する工程、前記レジスト膜を露光する工程、露光後にレジストを現像しレジストパターンを得る工程、レジストパターンに従いレジスト下層膜をエッチングする工程、パターン化されたレジスト下層膜により有機下層膜をエッチングする工程、及びパターン化された有機下層膜により半導体基板を加工する工程を含む半導体装置の製造方法、及び
第13観点として、更にパターン化されたレジスト下層膜を、硫酸と過酸化水素を含む水溶液で除去する工程を含む第11観点又は第12観点に記載の半導体装置の製造方法である。
ジヒドロキシ基はエポキシ基の開環反応によって形成されるが、エポキシ基と有機酸の反応では有機酸残基がエポキシ基の開環反応時に付加反応が生じジヒドロキシ構造を形成することができない。また、加水分解性シランの加水分解時に酸を用いると、エポキシ基の開環が同時に起こり、シラノール基とジヒドロキシル基の副反応も生じる。
しかし、本発明ではエポキシ基の開環によるジヒドロキシル基が、ジヒドロキシル基同士で、又はジヒドロキシル基とシラノール基の間で、又はジヒドロキシル基と有機架橋性化合物との間で架橋構造を形成するために、本願のレジスト下層膜の上部に上塗りされるレジスト組成物によってインターミキシングを起こすことがなく、その後に下層を加工した後にSPM(硫酸と過酸化水素水の混合水溶液)で除去が可能となる。
前記ジヒドロキシ基を有する有機基を含む加水分解縮合物におけるジヒドロキシ基は、エポキシ基を有する有機基を含む加水分解縮合物における該エポキシ基の無機酸又はカチオン交換樹脂による開環反応により生じたものであり、
前記エポキシ基を有する有機基を含む加水分解縮合物は、エポキシ基を有する加水分解性シランを全加水分解性シランに基づいて10~90モル%の割合で含む加水分解性シランのアルカリ性物質水溶液による加水分解縮合物である、レジスト下層膜形成組成物である。
そして、エポキシ基を有する加水分解性シランを全加水分解性シランに基づいて10~90モル%の割合で含む加水分解性シランから、アルカリ性物質水溶液による加水分解縮合により、エポキシ基を有する有機基を含む加水分解縮合物を得る工程、及び
該エポキシ基を有する有機基を含む加水分解縮合物を含む反応系で更に無機酸又はカチオン交換樹脂により該エポキシ基を開環して、ジヒドロキシ基を有する有機基を含む加水分解縮合物を得る工程、を含むことを特徴とするレジスト下層膜形成組成物の製造方法である。
固形分中に占める加水分解性シラン、その加水分解物、及びその加水分解縮合物の割合は、20質量%以上であり、例えば50~100質量%、60~99質量%、70~99質量%である。
式(1)中、R1はシクロヘキシルエポキシ基、グリシドキシアルキル基、又はそれらを含む有機基であり且つSi-C結合によりケイ素原子結合しているものである。R2は式(1)中、R1はシクロヘキシルエポキシ基、グリシドキシアルキル基、又はそれらを含む有機基であり且つSi-C結合によりケイ素原子結合しているものである。R2はアルキル基、アリール基、ハロゲン化アルキル基、ハロゲン化アリール基、アルコキシアリール基、アルケニル基、アシルオキシアルキル基、又はアクリロイル基、メタクリロイル基、メルカプト基、アミノ基、アミド基、ヒドロキシル基、アルコキシ基、エステル基、スルホニル基、もしくはシアノ基を有する有機基、又はそれらの組み合わせで且つSi-C結合によりケイ素原子と結合しているものである。R3はアルコキシ基、アシルオキシ基、又はハロゲン基を示す。aは1の整数を示し、bは0~2の整数を示し、a+bは1~3の整数を示す。
本願発明では加水分解性シランが、式(1)の加水分解性シランとその他の加水分解性シランを組み合わせて用いることができ、その他の加水分解性シランが式(2)及び式(3)からなる群より選ばれた少なくとも1種の加水分解性シランを用いることができる。
また、加水分解性基の1モル当たり0.001~10モル、好ましくは0.001~1モルの加水分解触媒を用いることができる。
加水分解と縮合を行う際の反応温度は、通常20~80℃である。
加水分解は完全に加水分解を行うことも、部分加水分解することでも良い。即ち、加水分解縮合物中に加水分解物やモノマーが残存していても良い。
加水分解し縮合させる際に触媒を用いることができる。
加水分解触媒としては、アルカリ性物質水溶液であり、アルカリ性物質としては有機塩基、無機塩基を挙げることができる。
上記カチオン交換樹脂とアニオン交換樹脂は反応系からろ過により容易に取り除くことができる。
本発明に用いられる架橋性化合物は、アルコキシメチル基又はヒドロキシメチル基を有する環構造を含む架橋性化合物、又はブロックイソシアネート基を有する架橋性化合物を上げることができる。
アルコキシメチル基はメトキシメチル基が好ましく用いることができる。
式(5)中、R13は水素原子又は炭素数1~10のアルキル基であり、R14は炭素数1~10のアルキル基であり、n3は1~4の整数であり、n4は0~(4-n3)であり、n3+n4は1~4の整数を示す。
オリゴマー及びポリマーは繰り返し単位構造の数が2~100、又は2~50の範囲で用いることができる。これらのアルキル基やアリール基は上述の例示を挙げることができる。
半導体装置の製造に使用される基板(例えば、シリコンウエハー基板、シリコン/二酸化シリコン被覆基板、シリコンナイトライド基板、ガラス基板、ITO基板、ポリイミド基板、及び低誘電率材料(low-k材料)被覆基板等)の上に、スピナー、コーター等の適当な塗布方法により本発明のレジスト下層膜形成組成物が塗布され、その後、焼成することによりレジスト下層膜が形成される。焼成する条件としては、焼成温度80℃~250℃、焼成時間0.3~60分間の中から適宜、選択される。好ましくは、焼成温度150℃~250℃、焼成時間0.5~2分間である。ここで、形成される下層膜の膜厚としては、例えば、10~1000nmであり、または20~500nmであり、または30~300nmであり、または50~100nmである。
その後、半導体基板の加工が行なわれる。半導体基板の加工はフッ素系ガスによるドライエッチングによって行なわれることが好ましい。
また、EUVレジストの下層膜としてはハードマスクとしての機能以外に以下の目的にも使用できる。EUVレジストとインターミキシングすることなく、EUV露光(波長13.5nm)に際して好ましくない露光光、例えば上述のUVやDUV(ArF光、KrF光)の基板又は界面からの反射を防止することができるEUVレジストの下層反射防止膜として、上記レジスト下層膜形成組成物を用いることができる。EUVレジストの下層で効率的に反射を防止することができる。EUVレジスト下層膜として用いた場合は、プロセスはフォトレジスト用下層膜と同様に行うことができる。
35質量%濃度のテトラエチルアンモニウムヒドロキシド水溶液1.81g、水2.89g、イソプロピルアルコール47.59g、メチルイソブチルケトン95.17gを1000mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらフェニルトリメトキシシラン4.27g、メチルトリエトキシシラン11.51g、シクロヘキシルエポキシエチルトリメトキシシラン31.81gを混合溶液に滴下した。全加水分解性シラン中にシクロヘキシルエポキシエチルトリメトキシシランを60モル%含有していた。
添加後、40℃に調整されたオイルバスにフラスコを移し、240分間、反応させた。その後、反応溶液に1M硝酸107.59gを加え、さらに40℃にてシクロヘキシルエポキシ基を開環しジヒドロキシル基を有する加水分解縮合物を得た。その後、メチルイソブチルケトン285.52g、水142.76gを加え、分液操作にて水層に移行した反応副生物である水、硝酸、テトラエチルアンモニウム硝酸塩を留去し、有機層を回収した。その後、プロピレングリコールモノメチルエーテルを142.76g加え、メチルイソブチルケトン、メタノール、エタノール、水を減圧留去し、濃縮して加水分解縮合物(ポリマー)水溶液を得た。さらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(A-1)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2500であり、エポキシ価は0であった。
35質量%濃度のテトラエチルアンモニウムヒドロキシド水溶液1.61g、水2.57g、イソプロピルアルコール46.45g、メチルイソブチルケトン92.90gを1000mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらトリエトキシシリルプロピルジアリルイソシアヌレート7.92g、メチルトリエトキシシラン10.24g、シクロヘキシルエポキシエチルトリメトキシシラン28.30gを混合溶液に滴下した。全加水分解性シラン中にシクロヘキシルエポキシエチルトリメトキシシランを60モル%含有していた。添加後、40℃に調整されたオイルバスにフラスコを移し、240分間、反応させた。その後、反応溶液に1M硝酸95.70gを加え、さらに40℃にてシクロヘキシルエポキシ基を開環しジヒドロキシル基を有する加水分解縮合物を得た。その後、メチルイソブチルケトン278.69g、水139.35gを加え、分液操作にて水層に移行した反応副生物である水、硝酸、テトラエチルアンモニウム硝酸塩を留去し、有機層を回収した。その後、プロピレングリコールモノメチルエーテルを139.35g加え、メチルイソブチルケトン、メタノール、エタノール、水を減圧留去し、濃縮して加水分解縮合物(ポリマー)水溶液を得た。さらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(A-2)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2700であり、エポキシ価は0であった。
35質量%濃度のテトラエチルアンモニウムヒドロキシド水溶液1.48g、水2.36g、イソプロピルアルコール39.50g、メチルイソブチルケトン79.00gを1000mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらトリエトキシシリルプロピルジアリルイソシアヌレート7.27g、メチルトリエトキシシラン6.27g、シクロヘキシルエポキシエチルトリメトキシシラン25.97g、エトキシエトキシフェニルトリメトキシシラン5.03gを混合溶液に滴下した。全加水分解性シラン中にシクロヘキシルエポキシエチルトリメトキシシランを60モル%含有していた。添加後、40℃に調整されたオイルバスにフラスコを移し、240分間、反応させた。その後、反応溶液に1M硝酸87.84gを加え、さらに40℃にてシクロヘキシルエポキシ基を開環しジヒドロキシル基を有する加水分解縮合物を得た。その後、メチルイソブチルケトン237.01g、水118.51gを加え、分液操作にて水層に移行した反応副生物である水、硝酸、テトラエチルアンモニウム硝酸塩を留去し、有機層を回収した。その後、プロピレングリコールモノメチルエーテルを118.51g加え、メチルイソブチルケトン、メタノール、エタノール、水を減圧留去し、濃縮して加水分解縮合物(ポリマー)水溶液を得た。さらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(A-3)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2400であり、エポキシ価は0であった。
35質量%濃度のテトラエチルアンモニウムヒドロキシド水溶液1.52g、水2.43g、イソプロピルアルコール40.55g、メチルイソブチルケトン81.10gを1000mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらトリエトキシシリルプロピルジアリルイソシアヌレート7.46g、メチルトリエトキシシラン6.43g、シクロヘキシルエポキシエチルトリメトキシシラン26.66g、メトキシベンジルトリメトキシシラン4.37gを混合溶液に滴下した。全加水分解性シラン中にシクロヘキシルエポキシエチルトリメトキシシランを60モル%含有していた。添加後、40℃に調整されたオイルバスにフラスコを移し、240分間、反応させた。その後、反応溶液に1M硝酸90.17gを加え、さらに40℃にてシクロヘキシルエポキシ基を開環しジヒドロキシル基を有する加水分解縮合物を得た。その後、メチルイソブチルケトン243.29g、水121.65gを加え、分液操作にて水層に移行した反応副生物である水、硝酸、テトラエチルアンモニウム硝酸塩を留去し、有機層を回収した。その後、プロピレングリコールモノメチルエーテルを121.65g加え、メチルイソブチルケトン、メタノール、エタノール、水を減圧留去し、濃縮して加水分解縮合物(ポリマー)水溶液を得た。さらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(A-4)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2600であり、エポキシ価は0であった。
35質量%濃度のテトラエチルアンモニウムヒドロキシド水溶液1.61g、水2.57g、イソプロピルアルコール41.20g、メチルイソブチルケトン82.39gを1000mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらトリエトキシシリルプロピルジアリルイソシアヌレート7.92g、メチルトリエトキシシラン6.83g、シクロヘキシルエポキシエチルトリメトキシシラン9.43g、エトキシエトキシフェニルトリメトキシシラン5.48g、アセトキシプロピルトリメトキシシラン17.02gを混合溶液に滴下した。全加水分解性シラン中にシクロヘキシルエポキシエチルトリメトキシシランを20モル%含有していた。添加後、40℃に調整されたオイルバスにフラスコを移し、240分間、反応させた。その後、反応溶液に1M硝酸95.71gを加え、さらに40℃にてシクロヘキシルエポキシ基を開環しジヒドロキシル基を有する加水分解縮合物を得た。その後、メチルイソブチルケトン247.17g、水123.59gを加え、分液操作にて水層に移行した反応副生物である水、硝酸、テトラエチルアンモニウム硝酸塩を留去し、有機層を回収した。その後、プロピレングリコールモノメチルエーテルを123.59g加え、メチルイソブチルケトン、メタノール、エタノール、水を減圧留去し、濃縮して加水分解縮合物(ポリマー)水溶液を得た。さらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(A-5)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2800であり、エポキシ価は0であった。
35質量%濃度のテトラエチルアンモニウムヒドロキシド水溶液1.68g、水2.69g、イソプロピルアルコール44.19g、メチルイソブチルケトン88.38gを1000mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらトリエトキシシリルプロピルジアリルイソシアヌレート8.28g、メチルトリエトキシシラン7.14g、シクロヘキシルエポキシエチルトリメトキシシラン9.86g、エトキシエトキシフェニルトリメトキシシラン5.73g、アセトキシメチルトリエトキシシラン18.92gを混合溶液に滴下した。全加水分解性シラン中にシクロヘキシルエポキシエチルトリメトキシシランを20モル%含有していた。添加後、40℃に調整されたオイルバスにフラスコを移し、240分間、反応させた。その後、反応溶液に1M硝酸100.06gを加え、さらに40℃にてシクロヘキシルエポキシ基を開環しジヒドロキシル基を有する加水分解縮合物を得た。その後、メチルイソブチルケトン265.15g、水132.58gを加え、分液操作にて水層に移行した反応副生物である水、硝酸、テトラエチルアンモニウム硝酸塩を留去し、有機層を回収した。その後、プロピレングリコールモノメチルエーテルを132.58g加え、メチルイソブチルケトン、メタノール、エタノール、水を減圧留去し、濃縮して加水分解縮合物(ポリマー)水溶液を得た。さらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(A-6)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2800であり、エポキシ価は0であった。
35質量%濃度のテトラエチルアンモニウムヒドロキシド水溶液1.61g、水2.58g、イソプロピルアルコール45.73g、メチルイソブチルケトン91.47gを1000mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらトリエトキシシリルプロピルジアリルイソシアヌレート7.93g、メチルトリエトキシシラン3.42g、シクロヘキシルエポキシエチルトリメトキシシラン9.45g、エトキシエトキシフェニルトリメトキシシラン5.49g、アセトキシメチルトリエトキシシラン18.13g、ビス(トリエトキシシリル)エタン6.80gを混合溶液に滴下した。全加水分解性シラン中にシクロヘキシルエポキシエチルトリメトキシシランを20モル%含有していた。添加後、40℃に調整されたオイルバスにフラスコを移し、240分間、反応させた。その後、反応溶液に1M硝酸95.90gを加え、さらに40℃にてシクロヘキシルエポキシ基を開環しジヒドロキシル基を有する加水分解縮合物を得た。その後、メチルイソブチルケトン274.41g、水137.20gを加え、分液操作にて水層に移行した反応副生物である水、硝酸、テトラエチルアンモニウム硝酸塩を留去し、有機層を回収した。その後、プロピレングリコールモノメチルエーテルを137.20g加え、メチルイソブチルケトン、メタノール、エタノール、水を減圧留去し、濃縮して加水分解縮合物(ポリマー)水溶液を得た。さらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(A-7)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw4300であり、エポキシ価は0であった。
35質量%濃度のテトラエチルアンモニウムヒドロキシド水溶液1.70g、水2.72g、イソプロピルアルコール45.82g、メチルイソブチルケトン91.65gを1000mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらトリエトキシシリルプロピルジアリルイソシアヌレート8.35g、テトラエトキシラン8.42g、シクロヘキシルエポキシエチルトリメトキシシラン9.95g、エトキシエトキシフェニルトリメトキシシラン5.79g、アセトキシメチルトリエトキシシラン19.10gを混合溶液に滴下した。全加水分解性シラン中にシクロヘキシルエポキシエチルトリメトキシシランを20モル%含有していた。添加後、40℃に調整されたオイルバスにフラスコを移し、240分間、反応させた。その後、反応溶液に1M硝酸101.01gを加え、さらに40℃にてシクロヘキシルエポキシ基を開環しジヒドロキシル基を有する加水分解縮合物を得た。その後、メチルイソブチルケトン274.95g、水137.47gを加え、分液操作にて水層に移行した反応副生物である水、硝酸、テトラエチルアンモニウム硝酸塩を留去し、有機層を回収した。その後、プロピレングリコールモノメチルエーテルを137.47g加え、メチルイソブチルケトン、メタノール、エタノール、水を減圧留去し、濃縮して加水分解縮合物(ポリマー)水溶液を得た。さらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(A-8)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw3800であり、エポキシ価は0であった。
35質量%濃度のテトラエチルアンモニウムヒドロキシド水溶液1.72g、水2.75g、イソプロピルアルコール46.04g、メチルイソブチルケトン92.08gを1000mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらトリエトキシシリルプロピルジアリルイソシアヌレート8.47g、テトラエトキシラン8.53g、グリシドキシプロピルトリメトキシシラン9.98g、エトキシエトキシフェニルトリメトキシシラン5.87g、アセトキシメチルトリエトキシシラン19.36gを混合溶液に滴下した。全加水分解性シラン中にグリシドキシプロピルトリメトキシシランを20モル%含有していた。添加後、40℃に調整されたオイルバスにフラスコを移し、240分間、反応させた。その後、反応溶液に1M硝酸102.39gを加え、さらに40℃にてグリシドキシ基を開環しジヒドロキシル基を有する加水分解縮合物を得た。その後、メチルイソブチルケトン276.25g、水138.12gを加え、分液操作にて水層に移行した反応副生物である水、硝酸、テトラエチルアンモニウム硝酸塩を留去し、有機層を回収した。その後、プロピレングリコールモノメチルエーテルを138.12g加え、メチルイソブチルケトン、メタノール、エタノール、水を減圧留去し、濃縮して加水分解縮合物(ポリマー)水溶液を得た。さらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(A-9)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2800であり、エポキシ価は0であった。
35質量%濃度のテトラエチルアンモニウムヒドロキシド水溶液1.77g、水2.82g、イソプロピルアルコール44.88g、メチルイソブチルケトン89.76gを1000mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら(2-メトキシ-4-(メトキシメチル)フェノキシ)メチルトリエトキシシラン7.23g、メチルトリエトキシシラン7.48g、シクロヘキシルエポキシエチルトリメトキシシラン10.34g、エトキシエトキシフェニルトリメトキシシラン6.01g、アセトキシメチルトリエトキシシラン19.83gを混合溶液に滴下した。全加水分解性シラン中にシクロヘキシルエポキシエチルトリメトキシシランを20モル%含有していた。添加後、40℃に調整されたオイルバスにフラスコを移し、240分間、反応させた。その後、反応溶液に1M硝酸104.89gを加え、さらに40℃にてシクロヘキシルエポキシ基を開環しジヒドロキシル基を有する加水分解縮合物を得た。その後、メチルイソブチルケトン274.95g、水137.47gを加え、分液操作にて水層に移行した反応副生物である水、硝酸、テトラエチルアンモニウム硝酸塩を留去し、有機層を回収した。その後、プロピレングリコールモノメチルエーテルを137.47g加え、メチルイソブチルケトン、メタノール、エタノール、水を減圧留去し、濃縮して加水分解縮合物(ポリマー)水溶液を得た。さらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(1)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw3000であり、エポキシ価は0であった。
35質量%濃度のテトラエチルアンモニウムヒドロキシド水溶液1.35g、水2.16、イソプロピルアルコール41.39g、メチルイソブチルケトン82.79gを1000mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらトリエトキシシリルプロピルジアリルイソシアヌレート6.64g、メチルトリエトキシシラン5.73g、シクロヘキシルエポキシエチルトリメトキシシラン7.92g、エトキシエトキシフェニルトリメトキシシラン4.60g、5-(トリエトキシシリル)ヘキサヒドロ-4,7-メタノイソベンゾフラン‐1,3-ジオン21.10gを混合溶液に滴下した。全加水分解性シラン中にシクロヘキシルエポキシエチルトリメトキシシランを20モル%含有していた。添加後、40℃に調整されたオイルバスにフラスコを移し、240分間、反応させた。その後、反応溶液に1M硝酸80.32gを加え、さらに40℃にてシクロヘキシルエポキシ基を開環しジヒドロキシル基を有する加水分解縮合物を得た。その後、メチルイソブチルケトン248.36g、水124.18gを加え、分液操作にて水層に移行した反応副生物である水、硝酸、テトラエチルアンモニウム硝酸塩を留去し、有機層を回収した。その後、プロピレングリコールモノメチルエーテルを124.18g加え、メチルイソブチルケトン、メタノール、エタノール、水を減圧留去し、濃縮して加水分解縮合物(ポリマー)水溶液を得た。さらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(A-11)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2400であり、エポキシ価は0であった。
35質量%濃度のテトラエチルアンモニウムヒドロキシド水溶液1.26g、水2.01g、イソプロピルアルコール40.62g、メチルイソブチルケトン81.23gを1000mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらトリエトキシシリルプロピルジアリルイソシアヌレート6.19g、メチルトリエトキシシラン5.34g、シクロヘキシルエポキシエチルトリメトキシシラン7.38g、エトキシエトキシフェニルトリメトキシシラン4.29g、2,2,5-トリメチル-5-(3-(トリエトキシシリル)プロピル)-1,3-ジオキサン-4,6-ジオン21.71gを混合溶液に滴下した。全加水分解性シラン中にシクロヘキシルエポキシエチルトリメトキシシランを20モル%含有していた。添加後、40℃に調整されたオイルバスにフラスコを移し、240分間、反応させた。その後、反応溶液に1M硝酸74.86gを加え、さらに40℃にてシクロヘキシルエポキシ基を開環しジヒドロキシル基を有する加水分解縮合物を得た。その後、メチルイソブチルケトン243.70g、水121.85gを加え、分液操作にて水層に移行した反応副生物である水、硝酸、テトラエチルアンモニウム硝酸塩を留去し、有機層を回収した。その後、プロピレングリコールモノメチルエーテルを121.85g加え、メチルイソブチルケトン、メタノール、エタノール、水を減圧留去し、濃縮して加水分解縮合物(ポリマー)水溶液を得た。さらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(A-12)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2600であり、エポキシ価は0であった。
35質量%濃度のテトラエチルアンモニウムヒドロキシド水溶液1.37g、水2.19g、イソプロピルアルコール41.52g、メチルイソブチルケトン83.04gを1000mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら(ビシクロ(2,2,1)ヘプタ-5-エン-イル)トリエトキシシラン4.17g、メチルトリエトキシシラン5.79g、シクロヘキシルエポキシエチルトリメトキシシラン8.01g、エトキシエトキシフェニルトリメトキシシラン4.65g、2,2,5-トリメチル-5-(3-(トリエトキシシリル)プロピル)-1,3-ジオキサン-4,6-ジオン23.56gを混合溶液に滴下した。全加水分解性シラン中にシクロヘキシルエポキシエチルトリメトキシシランを20モル%含有していた。添加後、40℃に調整されたオイルバスにフラスコを移し、240分間、反応させた。その後、反応溶液に1M硝酸74.86gを加え、さらに40℃にてシクロヘキシルエポキシ基を開環しジヒドロキシル基を有する加水分解縮合物を得た。その後、メチルイソブチルケトン243.70g、水121.85gを加え、分液操作にて水層に移行した反応副生物である水、硝酸、テトラエチルアンモニウム硝酸塩を留去し、有機層を回収した。その後、プロピレングリコールモノメチルエーテルを121.85g加え、メチルイソブチルケトン、メタノール、エタノール、水を減圧留去し、濃縮して加水分解縮合物(ポリマー)水溶液を得た。さらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(A-13)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2800であり、エポキシ価は0であった。
35質量%濃度のテトラエチルアンモニウムヒドロキシド水溶液1.63g、水2.61g、イソプロピルアルコール40.51g、メチルイソブチルケトン81.01gを1000mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらフェニルスルホニルプロピルトリエトキシシラン6.73g、メチルトリエトキシシラン6.93g、シクロヘキシルエポキシエチルトリメトキシシラン9.57g、エトキシエトキシフェニルトリメトキシシラン5.56g、アセトキシプロピルトリメトキシシラン17.27gを混合溶液に滴下した。全加水分解性シラン中にシクロヘキシルエポキシエチルトリメトキシシランを20モル%含有していた。添加後、40℃に調整されたオイルバスにフラスコを移し、240分間、反応させた。その後、反応溶液に1M硝酸97.13を加え、さらに40℃にてシクロヘキシルエポキシ基を開環しジヒドロキシル基を有する加水分解縮合物を得た。その後、メチルイソブチルケトン243.04g、水121.52gを加え、分液操作にて水層に移行した反応副生物である水、硝酸、テトラエチルアンモニウム硝酸塩を留去し、有機層を回収した。その後、プロピレングリコールモノメチルエーテルを121.52g加え、メチルイソブチルケトン、メタノール、エタノール、水を減圧留去し、濃縮して加水分解縮合物(ポリマー)水溶液を得た。さらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(A-14)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2300であり、エポキシ価は0であった。
35質量%濃度のテトラエチルアンモニウムヒドロキシド水溶液1.70g、水2.72g、イソプロピルアルコール45.82g、メチルイソブチルケトン91.65gを1000mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらトリエトキシシリルプロピルジアリルイソシアヌレート8.35g、テトラエトキシラン8.42g、シクロヘキシルエポキシエチルトリメトキシシラン9.95g、エトキシエトキシフェニルトリメトキシシラン5.79g、アセトキシメチルトリエトキシシラン19.10gを混合溶液に滴下した。全加水分解性シラン中にシクロヘキシルエポキシエチルトリメトキシシランを20モル%含有していた。添加後、40℃に調整されたオイルバスにフラスコを移し、240分間、反応させた。その後、反応溶液にカチオン交換樹脂30gを加え、40℃にてシクロヘキシルエポキシ基を開環しジヒドロキシル基を有する加水分解縮合物を得た。その後、アニオン交換樹脂60gを加えた。その後、カチオン交換樹脂、アニオン交換樹脂をナイロンメッシュフィルターにより留去した後、プロピレングリコールモノメチルエーテルを137.47g加え、メチルイソブチルケトン、メタノール、エタノール、水を減圧留去し、濃縮して加水分解縮合物(ポリマー)水溶液を得た。さらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(A-15)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw6000であり、エポキシ価は0であった。
35質量%濃度のテトラエチルアンモニウムヒドロキシド水溶液1.81g、水2.89g、イソプロピルアルコール47.59g、メチルイソブチルケトン95.17gを1000mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらフェニルトリメトキシシラン4.27g、メチルトリエトキシシラン11.51g、シクロヘキシルエポキシエチルトリメトキシシラン31.81gを混合溶液に滴下した。全加水分解性シラン中にシクロヘキシルエポキシエチルトリメトキシシランを60モル%含有していた。添加後、40℃に調整されたオイルバスにフラスコを移し、240分間、反応させた。その後、メチルイソブチルケトン285.52g、水142.76gを加え、分液操作にて水層に移行した反応副生物である水、テトラエチルアンモニウムヒドロキシドを留去し、有機層を回収した。その後、プロピレングリコールモノメチルエーテルを142.76g加え、メチルイソブチルケトン、メタノール、エタノール、水を減圧留去し、濃縮して加水分解縮合物(ポリマー)水溶液を得た。さらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(B-1)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2300であり、エポキシ価よりエポキシ基が95%以上残存していた。
35質量%濃度のテトラエチルアンモニウムヒドロキシド水溶液3.20g、水5.12g、イソプロピルアルコール69.91g、メチルイソブチルケトン139.81gを1000mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらフェニルトリメトキシシラン7.55g、メチルトリエトキシシラン57.67g、シクロヘキシルエポキシエチルトリメトキシシラン4.69gを混合溶液に滴下した。全加水分解性シラン中にシクロヘキシルエポキシエチルトリメトキシシランを5モル%含有していた。添加後、40℃に調整されたオイルバスにフラスコを移し、240分間、反応させた。その後、反応溶液に1M硝酸190.27を加え、さらに40℃にてシクロヘキシルエポキシ基を開環しジヒドロキシル基を有する加水分解縮合物を得た。その後、メチルイソブチルケトン419.44g、水209.72gを加え、分液操作にて水層に移行した反応副生物である水、テトラエチルアンモニウムヒドロキシドを留去し、有機層を回収した。その後、プロピレングリコールモノメチルエーテルを209.72g加え、メチルイソブチルケトン、メタノール、エタノール、水を減圧留去し、濃縮して加水分解縮合物(ポリマー)水溶液を得た。さらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(B-2)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw4000であり、エポキシ価は0であった。
35質量%濃度のテトラエチルアンモニウムヒドロキシド水溶液2.96g、水4.73g、イソプロピルアルコール66.01g、メチルイソブチルケトン132.02gを1000mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらフェニルトリメトキシシラン7.35g、メチルトリエトキシシラン49.54g、シクロヘキシルエポキシエチルトリメトキシシラン9.13gを混合溶液に滴下した。全加水分解性シラン中にシクロヘキシルエポキシエチルトリメトキシシランを10モル%含有していた。添加後、40℃に調整されたオイルバスにフラスコを移し、240分間、反応させた。その後、反応溶液に1M酢酸175.96gを加え、さらに40℃にてシクロヘキシルエポキシ基を開環しアセトキシ基とモノヒドロキシル基を有する加水分解縮合物を得た。その後、メチルイソブチルケトン396.05g、水198.03gを加え、分液操作にて水層に移行した反応副生物である水、テトラエチルアンモニウムヒドロキシドを留去し、有機層を回収した。その後、プロピレングリコールモノメチルエーテルを198.03g加え、メチルイソブチルケトン、メタノール、エタノール、水を減圧留去し、濃縮して加水分解縮合物(ポリマー)水溶液を得た。さらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(B-3)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw3800であり、エポキシ価は0であった。
上記合成例1~15、及び比較合成例1~3で得られた加水分解縮合物(Siポリマー)、酸、溶媒を表1に示す割合で混合し、0.1μmのフッ素樹脂製のフィルターで濾過することによって、レジスト下層膜形成組成物をそれぞれ調製した。表1中のポリマーの添加割合はポリマー溶液の添加量ではなく、ポリマー自体の添加量を示した。
窒素下、100mL四口フラスコにカルバゾール(6.69g、0.040mol、東京化成工業(株)製)、9-フルオレノン(7.28g、0.040mol、東京化成工業(株)製)、パラトルエンスルホン酸一水和物(0.76g、0.0040mol、東京化成工業(株)製)を加え、1,4-ジオキサン(6.69g、関東化学(株)製)を仕込み撹拌し、100℃まで昇温し溶解させ重合を開始した。24時間後60℃まで放冷後、クロロホルム(34g、関東化学(株)製)を加え希釈し、メタノール(168g、関東化学(株)製)へ再沈殿させた。得られた沈殿物をろ過し、減圧乾燥機で80℃、24時間乾燥し、目的とするポリマー(式(C-1))、以下PCzFLと略す)9.37gを得た。
1H-NMR(400MHz,DMSO-d6):δ7.03-7.55(br,12H),δ7.61-8.10(br,4H),δ11.18(br,1H)
PCzFLのGPCによるポリスチレン換算で測定される重量平均分子量Mwは2800、多分散度Mw/Mnは1.77であった。
得られた樹脂20gに、架橋剤としてテトラメトキシメチルグリコールウリル(三井サイテック(株)製、商品名パウダーリンク1174)3.0g、触媒としてピリジニウムパラトルエンスルホネート0.30g、界面活性剤としてメガファックR-30(大日本インキ化学(株)製、商品名)0.06gを混合し、プロピレングリコールモノメチルエーテルアセテート88gに溶解させ溶液とした。その後、孔径0.10μmのポリエチレン製ミクロフィルターを用いて濾過し、更に、孔径0.05μmのポリエチレン製ミクロフィルターを用いて濾過して、多層膜によるリソグラフィープロセスに用いる有機下層膜形成組成物の溶液を調製した。
実施例1~18、比較例1~3で調製したレジスト下層膜形成組成物をスピナーを用い、シリコンウェハー上に塗布した。ホットプレート上で180℃1分間加熱し、Si含有レジスト下層膜をそれぞれ形成した。その後、プロピレングリコールモノメチルエーテル/プロピレングリコールモノメチルエーテルアセテート=7/3の溶剤をSi含有レジスト下層膜上に塗布、スピン乾燥し、溶剤塗布前後での膜厚の変化の有無をパターン形状で評価した。膜厚変化が1%未満のものを「良好」、膜厚変化が1%以上のものを「硬化せず」とした。
ドライエッチング速度の測定に用いたエッチャー及びエッチングガスは以下のものを用いた。
ES401(日本サイエンティフィック製):CF4
RIE-10NR(サムコ製):O2
実施例1~18で調製したSi含有塗布液をスピナーを用い、シリコンウェハー上に塗布した。ホットプレート上で180℃1分間加熱し、Si含有レジスト下層膜(膜厚0.1μm(CF4ガスでのエッチング速度測定用)、膜厚0.1μm(O2ガスでのエッチング速度測定用))をそれぞれ形成した。
エッチングガスとしてCF4ガス、O2ガスを使用してドライエッチング速度を測定した。
(レジストパターニング評価:アルカリ現像を行うPTD工程を経由した評価)
上記の得られた有機下層膜(A層)形成組成物をシリコンウエハー上に塗布し、ホットプレート上で240℃で60秒間ベークし、膜厚200nmの有機下層膜(A層)を得た。その上に、実施例1~18、比較例1~3で得られたSi含有レジスト下層膜(B層)形成組成物をそれぞれ塗布し、ホットプレート上で240℃で60秒間ベークし、Si含有レジスト下層膜(B層)を得た。Si含有レジスト下層膜(B層)の膜厚は80nmであった。
それぞれのB層の上に市販のArF用レジスト溶液(JSR(株)製、商品名:AR2772JN)をスピナーによりそれぞれ塗布し、ホットプレート上で110℃にて1分間加熱し、膜厚120nmのフォトレジスト膜(C層)を形成した。
(株)ニコン製NSR-S307Eスキャナー(波長193nm、NA、σ:0.85、0.93/0.85)を用い、現像後にフォトレジストのライン幅及びそのライン間の幅が0.062μm、すなわち0.062μmのラインアンドスペース(L/S)=1/1のデンスラインが形成されるように設定されたマスクにそれぞれの積層体を通して露光を行った。その後、ホットプレート上100℃で60秒間ベークし、冷却後、2.38質量%濃度のアルカリ水溶液を用いて60秒現像し、レジスト下層膜(B層)上にポジ型のパターンを形成した。得られたフォトレジストパターンについて、大きなパターン剥がれやアンダーカット、ライン底部の太り(フッティング)が発生しないものを「良好」として評価した。レジストパターンの倒れがあるものを「パターン倒れ」として評価した。
Claims (13)
- ジヒドロキシ基を有する有機基を含む加水分解縮合物を含むことを特徴とするレジスト下層膜形成組成物であって、
前記ジヒドロキシ基を有する有機基を含む加水分解縮合物におけるジヒドロキシ基は、エポキシ基を有する有機基を含む加水分解縮合物における該エポキシ基の無機酸又はカチオン交換樹脂による開環反応により生じたものであり、
前記エポキシ基を有する有機基を含む加水分解縮合物は、エポキシ基を有する加水分解性シランを全加水分解性シランに基づいて10~90モル%の割合で含む加水分解性シランのアルカリ性物質水溶液による加水分解縮合物である、レジスト下層膜形成組成物。 - 上記エポキシ基を有する加水分解性シランを全加水分解性シランに基づいて10~90モル%の割合で含む加水分解性シランが式(1):
- 上記エポキシ基を有する加水分解性シランを全加水分解性シランに基づいて10~90モル%の割合で含む加水分解性シランが、式(1)の加水分解性シランに更に式(2):
- 式(1)の加水分解性シランを全加水分解性シランに基づいて10~90モル%の割合で含有している請求項2又は請求項3に記載のレジスト下層膜形成組成物。
- 更に架橋性化合物を含む請求項1乃至請求項4のいずれか1項に記載のレジスト下層膜形成組成物。
- 更に酸又は酸発生剤を含む請求項1乃至請求項5のいずれか1項に記載のレジスト下層膜形成組成物。
- 更に水を含む請求項1乃至請求項6のいずれか1項に記載のレジスト下層膜形成組成物。
- 前記加水分解性シランのアルカリ性物質水溶液による加水分解縮合物の生成と、前記エポキシ基の無機酸又はカチオン交換樹脂による開環反応が共に有機溶剤中で行われるものである請求項1乃至請求項7のいずれか1項に記載のレジスト下層膜形成組成物。
- 請求項1乃至請求項8のいずれか1項に記載のレジスト下層膜形成組成物を基板に塗布し焼成後に得られるレジスト下層膜であって、該レジスト下層膜は1:1~4:1のH2SO4/H2O2の質量比を有する硫酸と過酸化水素を含む水溶液で除去可能である上記レジスト下層膜。
- エポキシ基を有する加水分解性シランを全加水分解性シランに基づいて10~90モル%の割合で含む加水分解性シランから、アルカリ性物質水溶液による加水分解縮合により、エポキシ基を有する有機基を含む加水分解縮合物を得る工程、及び
該エポキシ基を有する有機基を含む加水分解縮合物を含む反応系で更に無機酸又はカチオン交換樹脂により該エポキシ基を開環して、ジヒドロキシ基を有する有機基を含む加水分解縮合物を得る工程、を含むことを特徴とする請求項1乃至請求項8のいずれか1項に記載のレジスト下層膜形成組成物の製造方法。 - 請求項1乃至請求項8のいずれか1項に記載のレジスト下層膜形成組成物を半導体基板上に塗布し、焼成しレジスト下層膜を形成する工程、前記下層膜の上にレジスト用組成物を塗布しレジスト膜を形成する工程、前記レジスト膜を露光する工程、露光後にレジストを現像しレジストパターンを得る工程、レジストパターンに従いレジスト下層膜をエッチングする工程、及びパターン化されたレジストとレジスト下層膜により半導体基板を加工する工程を含む半導体装置の製造方法。
- 半導体基板上に有機下層膜を形成する工程、その上に請求項1乃至請求項8のいずれか1項に記載のレジスト下層膜形成組成物を塗布し焼成しレジスト下層膜を形成する工程、前記レジスト下層膜の上にレジスト用組成物を塗布しレジスト層を形成する工程、前記レジスト膜を露光する工程、露光後にレジストを現像しレジストパターンを得る工程、レジストパターンに従いレジスト下層膜をエッチングする工程、パターン化されたレジスト下層膜により有機下層膜をエッチングする工程、及びパターン化された有機下層膜により半導体基板を加工する工程を含む半導体装置の製造方法。
- 更にパターン化されたレジスト下層膜を、硫酸と過酸化水素を含む水溶液で除去する工程を含む請求項11又は請求項12に記載の半導体装置の製造方法。
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- 2017-10-25 US US16/345,821 patent/US20190265593A1/en not_active Abandoned
- 2017-10-25 KR KR1020197007967A patent/KR20190072515A/ko unknown
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Also Published As
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US20190265593A1 (en) | 2019-08-29 |
TW201829671A (zh) | 2018-08-16 |
CN109891321A (zh) | 2019-06-14 |
KR20190072515A (ko) | 2019-06-25 |
JPWO2018079599A1 (ja) | 2019-09-19 |
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