WO2015037398A1 - 多層レジストプロセス用無機膜形成組成物及びパターン形成方法 - Google Patents
多層レジストプロセス用無機膜形成組成物及びパターン形成方法 Download PDFInfo
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- WO2015037398A1 WO2015037398A1 PCT/JP2014/071589 JP2014071589W WO2015037398A1 WO 2015037398 A1 WO2015037398 A1 WO 2015037398A1 JP 2014071589 W JP2014071589 W JP 2014071589W WO 2015037398 A1 WO2015037398 A1 WO 2015037398A1
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- inorganic film
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- 239000003999 initiator Substances 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- GJRQTCIYDGXPES-UHFFFAOYSA-N iso-butyl acetate Natural products CC(C)COC(C)=O GJRQTCIYDGXPES-UHFFFAOYSA-N 0.000 description 1
- FGKJLKRYENPLQH-UHFFFAOYSA-M isocaproate Chemical compound CC(C)CCC([O-])=O FGKJLKRYENPLQH-UHFFFAOYSA-M 0.000 description 1
- 125000001972 isopentyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])C([H])([H])* 0.000 description 1
- JMMWKPVZQRWMSS-UHFFFAOYSA-N isopropanol acetate Natural products CC(C)OC(C)=O JMMWKPVZQRWMSS-UHFFFAOYSA-N 0.000 description 1
- 229940011051 isopropyl acetate Drugs 0.000 description 1
- GWYFCOCPABKNJV-UHFFFAOYSA-M isovalerate Chemical compound CC(C)CC([O-])=O GWYFCOCPABKNJV-UHFFFAOYSA-M 0.000 description 1
- OQAGVSWESNCJJT-UHFFFAOYSA-N isovaleric acid methyl ester Natural products COC(=O)CC(C)C OQAGVSWESNCJJT-UHFFFAOYSA-N 0.000 description 1
- DTOSIQBPPRVQHS-PDBXOOCHSA-M linolenate Chemical compound CC\C=C/C\C=C/C\C=C/CCCCCCCC([O-])=O DTOSIQBPPRVQHS-PDBXOOCHSA-M 0.000 description 1
- 229940040452 linolenate Drugs 0.000 description 1
- UZKWTJUDCOPSNM-UHFFFAOYSA-N methoxybenzene Substances CCCCOC=C UZKWTJUDCOPSNM-UHFFFAOYSA-N 0.000 description 1
- IMXBRVLCKXGWSS-UHFFFAOYSA-N methyl 2-cyclohexylacetate Chemical compound COC(=O)CC1CCCCC1 IMXBRVLCKXGWSS-UHFFFAOYSA-N 0.000 description 1
- 229940043265 methyl isobutyl ketone Drugs 0.000 description 1
- 229940057867 methyl lactate Drugs 0.000 description 1
- MGJXBDMLVWIYOQ-UHFFFAOYSA-N methylazanide Chemical compound [NH-]C MGJXBDMLVWIYOQ-UHFFFAOYSA-N 0.000 description 1
- NFWSQSCIDYBUOU-UHFFFAOYSA-N methylcyclopentadiene Chemical compound CC1=CC=CC1 NFWSQSCIDYBUOU-UHFFFAOYSA-N 0.000 description 1
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- HEPOEAALKWFVLE-UHFFFAOYSA-N n -((perfluorooctanesulfonyl)oxy)-5-norbornene-2,3-dicarboximide Chemical compound C1=CC2CC1C1C2C(=O)N(OS(=O)(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F)C1=O HEPOEAALKWFVLE-UHFFFAOYSA-N 0.000 description 1
- YCMDNBGUNDHOOD-UHFFFAOYSA-N n -((trifluoromethylsulfonyl)oxy)-5-norbornene-2,3-dicarboximide Chemical compound C1=CC2CC1C1C2C(=O)N(OS(=O)(=O)C(F)(F)F)C1=O YCMDNBGUNDHOOD-UHFFFAOYSA-N 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 229940017144 n-butyl lactate Drugs 0.000 description 1
- QJQAMHYHNCADNR-UHFFFAOYSA-N n-methylpropanamide Chemical compound CCC(=O)NC QJQAMHYHNCADNR-UHFFFAOYSA-N 0.000 description 1
- 125000003506 n-propoxy group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])O* 0.000 description 1
- MCPACASRTTWSHP-UHFFFAOYSA-N nitro 2-(2-bicyclo[2.2.1]heptanyl)-1,1,2,2-tetrafluoroethanesulfonate Chemical compound C12C(CC(CC1)C2)C(C(S(=O)(=O)O[N+](=O)[O-])(F)F)(F)F MCPACASRTTWSHP-UHFFFAOYSA-N 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- WSGCRAOTEDLMFQ-UHFFFAOYSA-N nonan-5-one Chemical compound CCCCC(=O)CCCC WSGCRAOTEDLMFQ-UHFFFAOYSA-N 0.000 description 1
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- SJYNFBVQFBRSIB-UHFFFAOYSA-N norbornadiene Chemical compound C1=CC2C=CC1C2 SJYNFBVQFBRSIB-UHFFFAOYSA-N 0.000 description 1
- JFNLZVQOOSMTJK-KNVOCYPGSA-N norbornene Chemical compound C1[C@@H]2CC[C@H]1C=C2 JFNLZVQOOSMTJK-KNVOCYPGSA-N 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- SJWFXCIHNDVPSH-UHFFFAOYSA-N octan-2-ol Chemical compound CCCCCCC(C)O SJWFXCIHNDVPSH-UHFFFAOYSA-N 0.000 description 1
- WYNVIVRXHYGNRT-UHFFFAOYSA-N octane-3,5-diol Chemical compound CCCC(O)CC(O)CC WYNVIVRXHYGNRT-UHFFFAOYSA-N 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- JCGNDDUYTRNOFT-UHFFFAOYSA-N oxolane-2,4-dione Chemical compound O=C1COC(=O)C1 JCGNDDUYTRNOFT-UHFFFAOYSA-N 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- WQIQNKQYEUMPBM-UHFFFAOYSA-N pentamethylcyclopentadiene Chemical compound CC1C(C)=C(C)C(C)=C1C WQIQNKQYEUMPBM-UHFFFAOYSA-N 0.000 description 1
- RGSFGYAAUTVSQA-UHFFFAOYSA-N pentamethylene Natural products C1CCCC1 RGSFGYAAUTVSQA-UHFFFAOYSA-N 0.000 description 1
- JYVLIDXNZAXMDK-UHFFFAOYSA-N pentan-2-ol Chemical compound CCCC(C)O JYVLIDXNZAXMDK-UHFFFAOYSA-N 0.000 description 1
- GTCCGKPBSJZVRZ-UHFFFAOYSA-N pentane-2,4-diol Chemical compound CC(O)CC(C)O GTCCGKPBSJZVRZ-UHFFFAOYSA-N 0.000 description 1
- GXOHBWLPQHTYPF-UHFFFAOYSA-N pentyl 2-hydroxypropanoate Chemical compound CCCCCOC(=O)C(C)O GXOHBWLPQHTYPF-UHFFFAOYSA-N 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- DLRJIFUOBPOJNS-UHFFFAOYSA-N phenetole Chemical compound CCOC1=CC=CC=C1 DLRJIFUOBPOJNS-UHFFFAOYSA-N 0.000 description 1
- 229960005323 phenoxyethanol Drugs 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 125000004437 phosphorous atom Chemical group 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920000259 polyoxyethylene lauryl ether Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 150000003141 primary amines Chemical class 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- ROSDSFDQCJNGOL-UHFFFAOYSA-N protonated dimethyl amine Chemical group CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 150000003902 salicylic acid esters Chemical class 0.000 description 1
- 238000000790 scattering method Methods 0.000 description 1
- DCKVNWZUADLDEH-UHFFFAOYSA-N sec-butyl acetate Chemical compound CCC(C)OC(C)=O DCKVNWZUADLDEH-UHFFFAOYSA-N 0.000 description 1
- 150000003335 secondary amines Chemical class 0.000 description 1
- 150000003377 silicon compounds Chemical class 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- WTKKCYNZRWIVKL-UHFFFAOYSA-N tantalum Chemical compound [Ta+5] WTKKCYNZRWIVKL-UHFFFAOYSA-N 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- DZLFLBLQUQXARW-UHFFFAOYSA-N tetrabutylammonium Chemical group CCCC[N+](CCCC)(CCCC)CCCC DZLFLBLQUQXARW-UHFFFAOYSA-N 0.000 description 1
- BRGJIIMZXMWMCC-UHFFFAOYSA-N tetradecan-2-ol Chemical compound CCCCCCCCCCCCC(C)O BRGJIIMZXMWMCC-UHFFFAOYSA-N 0.000 description 1
- CBXCPBUEXACCNR-UHFFFAOYSA-N tetraethylammonium Chemical group CC[N+](CC)(CC)CC CBXCPBUEXACCNR-UHFFFAOYSA-N 0.000 description 1
- 229940073455 tetraethylammonium hydroxide Drugs 0.000 description 1
- LRGJRHZIDJQFCL-UHFFFAOYSA-M tetraethylazanium;hydroxide Chemical compound [OH-].CC[N+](CC)(CC)CC LRGJRHZIDJQFCL-UHFFFAOYSA-M 0.000 description 1
- QEMXHQIAXOOASZ-UHFFFAOYSA-N tetramethylammonium Chemical group C[N+](C)(C)C QEMXHQIAXOOASZ-UHFFFAOYSA-N 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- YWYZEGXAUVWDED-UHFFFAOYSA-N triammonium citrate Chemical compound [NH4+].[NH4+].[NH4+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O YWYZEGXAUVWDED-UHFFFAOYSA-N 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-O triethanolammonium Chemical compound OCC[NH+](CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-O 0.000 description 1
- ZMANZCXQSJIPKH-UHFFFAOYSA-O triethylammonium ion Chemical group CC[NH+](CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-O 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- FAYMLNNRGCYLSR-UHFFFAOYSA-M triphenylsulfonium triflate Chemical compound [O-]S(=O)(=O)C(F)(F)F.C1=CC=CC=C1[S+](C=1C=CC=CC=1)C1=CC=CC=C1 FAYMLNNRGCYLSR-UHFFFAOYSA-M 0.000 description 1
- 229910001930 tungsten oxide Inorganic materials 0.000 description 1
- XMUJIPOFTAHSOK-UHFFFAOYSA-N undecan-2-ol Chemical compound CCCCCCCCCC(C)O XMUJIPOFTAHSOK-UHFFFAOYSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- 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
- G03F7/09—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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
-
- 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
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/091—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers characterised by antireflection means or light filtering or absorbing means, e.g. anti-halation, contrast enhancement
-
- 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
- H01L21/0276—Photolithographic processes using an anti-reflective 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
- H01L21/027—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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3065—Plasma etching; Reactive-ion etching
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
- H01L21/3081—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their composition, e.g. multilayer masks, materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
- H01L21/3083—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
- H01L21/3086—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane characterised by the process involved to create the mask, e.g. lift-off masks, sidewalls, or to modify the mask, e.g. pre-treatment, post-treatment
-
- 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
-
- 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
- H01L21/31144—Etching the insulating layers by chemical or physical means using masks
Definitions
- the present invention relates to an inorganic film forming composition for a multilayer resist process and a pattern forming method.
- an inorganic film is formed on a substrate using an inorganic film forming composition, and a resist pattern is formed on the inorganic film using an organic material having an etching rate different from that of the inorganic film.
- the resist pattern is transferred to an inorganic film by dry etching, and further transferred to the substrate by dry etching, whereby a substrate on which a desired pattern is formed is obtained (Japanese Patent Laid-Open Nos. 2001-284209 and 2010). -85912 and JP-A-2008-39811).
- the etching selectivity is also increased for a silicon dioxide film or an organic resist underlayer resist film that is disposed adjacent to the inorganic film.
- the use of a metal compound that can be used has also been studied (see JP 2005-537502 A).
- Such an inorganic film forming composition is required not only to have excellent etching selectivity as described above, but also to be able to make the shape of the resist pattern formed on the inorganic film favorable.
- the coating film formed by drying it can be dissolved and removed in the cleaning solvent by edge back rinse that cleans the edge and back surface of the substrate.
- the inorganic film components are difficult to volatilize from the coating film during baking when forming the inorganic film, and it is required that the inside of the chamber is not contaminated, and that pattern formation by a multilayer resist process can be stably performed.
- the above-mentioned conventional inorganic film forming composition cannot satisfy both of these requirements.
- the present invention has been made on the basis of the circumstances as described above, and an object thereof is to form an inorganic film excellent in resist pattern formability and etching selectivity, and is excellent in both cleaning solvent removal property and volatilization suppression property.
- An object of the present invention is to provide an inorganic film forming composition for a multilayer resist process.
- the invention made in order to solve the above problems includes at least one kind of a plurality of metal atoms selected from the group consisting of titanium, tantalum, zirconium and tungsten, an oxygen atom which bridges between the plurality of metal atoms, and the metal A metal compound containing a polydentate ligand coordinated to an atom (hereinafter also referred to as “[A] metal compound”) and a solvent (hereinafter also referred to as “[B] solvent”), It is an inorganic film forming composition for multilayer resist processes whose absolute molecular weight of the said [A] metal compound measured by a scattering method is 8,000 or more and 50,000 or less.
- Another invention made in order to solve the above-described problems includes a step of forming an inorganic film on the upper surface side of the substrate, a step of forming a resist pattern on the upper surface side of the inorganic film, and 1 or A pattern forming method comprising a step of forming a pattern on the substrate by dry etching a plurality of times, and forming the inorganic film with the inorganic film forming composition for a multilayer resist process.
- organic group means a group containing at least one carbon atom.
- an inorganic film excellent in resist pattern forming property and etching selectivity can be obtained while exhibiting both excellent cleaning solvent removal property and volatilization suppressing property. Can be formed. Therefore, they can be used very suitably in the LSI manufacturing process, which is expected to be further miniaturized in the future, particularly in the formation of fine contact holes and the like.
- the inorganic film forming composition for a multilayer resist process contains [A] a metal compound and [B] a solvent.
- the inorganic film-forming composition may contain a cross-linking accelerator (hereinafter also referred to as “[C] cross-linking accelerator”) as a suitable component, and may be any other component as long as the effects of the present invention are not impaired. It may contain components. Hereinafter, each component will be described.
- the metal compound bridges between the plurality of metal atoms and at least one metal atom selected from the group consisting of titanium, tantalum, zirconium and tungsten (hereinafter also referred to as “specific metal atom”).
- An absolute molecular weight measured by a static light scattering method includes an oxygen atom (hereinafter, also referred to as “bridged oxygen atom”) and a polydentate ligand coordinated to the metal atom, and has an absolute molecular weight of 8,000 to 50, 000 or less.
- the metal compound is a complex (binuclear complex) having a plurality of specific metal atoms and a bridging oxygen atom, and having a multidentate ligand coordinated to the specific metal atom.
- the said inorganic film formation composition can form the inorganic film which is excellent in resist pattern formation property and etching selectivity by containing a [A] metal compound, and is excellent in both cleaning solvent removal property and volatilization suppression property.
- [A] the specific metal atom constituting the metal compound, the bridging oxygen atom, and the polydentate ligand will be described in this order.
- the metal compound contains a plurality of metal atoms. This metal atom is at least one selected from the group consisting of titanium, tantalum, zirconium and tungsten. [A] By setting the metal atom of the metal compound to the above element, the inorganic film formed from the inorganic film-forming composition is excellent in resist pattern formability and etching selectivity.
- the plurality of specific metal atoms may be composed of atoms of one kind of element or may be composed of atoms of two or more kinds of elements, but the etching rate at the time of inorganic film etching transfer processing after forming a fine pattern Is preferably made of atoms of one kind of element from the viewpoint that it is desirable to be in-plane uniform on the nanometer order level.
- the metal atom is preferably titanium or zirconium.
- the said inorganic film formation composition can make the etching selectivity of an inorganic film, a board
- the metal compound may contain a metal atom other than the specific metal atom as long as the amount is within a range not impairing the effects of the present invention.
- the metal compound contains an oxygen atom that bridges the plurality of metal atoms.
- the metal compound can be a stable binuclear metal compound by containing such an oxygen atom that bridges the specific metal atom, and as a result, the inorganic compound formed from the inorganic film-forming composition.
- the film is excellent in resist pattern formability and etching selectivity.
- One bridging oxygen atom may be bonded to one metal atom, or a plurality of bridging oxygen atoms may be bonded to each other, but a structure in which two bridging oxygen atoms are bonded to the metal atom is mainly used. It is preferable to contain.
- the [A] metal compound is represented by —MO—MO— (M is a specific metal atom)
- M is a specific metal atom
- the solubility can be improved as a more linear structure, and as a result, the cleaning solvent removability of the inorganic film forming composition can be improved.
- “Mainly containing” the above structure means that 50 mol% or more, preferably 70 mol% or more, more preferably 90 mol% or more, particularly preferably 95 mol% or more of all metal atoms constituting the [A] metal compound. Has the above structure.
- the ligand that bridges the plurality of metal atoms in the metal compound includes other bridging ligands in addition to the bridging oxygen atoms as long as the amount is within a range that does not impair the effects of the present invention. You may go out.
- the other bridging ligands include peroxide ligands (—O—O—).
- the metal compound contains a multidentate ligand coordinated to the metal atom.
- the metal compound can enhance solubility, and as a result, the inorganic film-forming composition is excellent in cleaning solvent removability.
- the polydentate ligand is preferably a ligand derived from at least one selected from the group consisting of hydroxy acid esters, ⁇ -diketones, ⁇ -keto esters, ⁇ -dicarboxylic acid esters, and hydrocarbons having a ⁇ bond. .
- a multidentate ligand as the above ligand, the cleaning solvent removability of the inorganic film-forming composition can be further improved.
- These compounds usually form a multidentate ligand as an anion obtained by obtaining one electron or as it is.
- the hydroxy acid ester is not particularly limited as long as it is a carboxylic acid ester having a hydroxy group, and examples thereof include a compound represented by the following formula (2).
- R A is a divalent organic group having 1 to 20 carbon atoms.
- R B is a monovalent organic group having 1 to 20 carbon atoms.
- Examples of the divalent organic group represented by R A include a monovalent hydrocarbon group having 1 to 20 carbon atoms, and a divalent hetero group at the carbon-carbon end of the hydrocarbon group or at the terminal on the bond side.
- Examples include a group (a) containing an atom-containing group, a group obtained by substituting part or all of the hydrogen atoms of the hydrocarbon group and the group (a) with a monovalent heteroatom-containing group.
- Examples of the hetero atom contained in the monovalent or divalent heteroatom-containing group include an oxygen atom, a nitrogen atom, a sulfur atom, a silicon atom, and a phosphorus atom.
- Examples of the divalent heteroatom-containing group include —O—, —S—, —CO—, —CS—, —NR′—, a group combining these, and the like.
- R ′ is a hydrogen atom or a monovalent hydrocarbon group having 1 to 10 carbon atoms.
- Examples of the monovalent heteroatom-containing group include a hydroxy group, a sulfanyl group (—SH), an amino group, a cyano group, a carboxy group, and a keto group ( ⁇ O).
- Examples of the monovalent organic group represented by R B include a group in which one hydrogen atom is added to the group exemplified as the divalent organic group of R A.
- R A is preferably a divalent hydrocarbon group, more preferably an alkanediyl group, a cycloalkanediyl group or an arenediyl group, a methanediyl group, an ethanediyl group, a cyclohexanediyl group or a benzenediyl group, more preferably an ethanediyl group.
- R B preferably a monovalent hydrocarbon group, more preferably an alkyl group, a methyl group, an ethyl group, a propyl group, preferably a butyl group further ethyl group is particularly preferred.
- hydroxy acid ester examples include glycolic acid ester, lactic acid ester, 2-hydroxycyclohexane-1-carboxylic acid ester, and salicylic acid ester. Of these, lactic acid esters are preferred, and ethyl lactate is more preferred.
- the ⁇ -diketone is not particularly limited as long as it is a compound having a 1,3-diketo structure, and examples thereof include a compound represented by the following formula (3).
- R C and R D are each independently a monovalent organic group having 1 to 20 carbon atoms.
- R E is a hydrogen atom or a monovalent organic group having 1 to 20 carbon atoms.
- Examples of the monovalent organic group having 1 to 20 carbon atoms represented by R C , R D and R E are the same as those exemplified as the monovalent organic group of R B in the above formula (2). Groups and the like.
- R C and R D a monovalent hydrocarbon group is preferable, an alkyl group is more preferable, a methyl group, an ethyl group, a propyl group, and a butyl group are more preferable, and a methyl group is particularly preferable.
- R E is preferably a hydrogen atom or a monovalent hydrocarbon group, more preferably a hydrogen atom or an alkyl group, still more preferably a hydrogen atom or a methyl group, and particularly preferably a hydrogen atom.
- Examples of ⁇ -diketone include 2,4-pentanedione, 3-methyl-2,4-pentanedione, 3-ethyl-2,4-pentanedione, and the like. Of these, 2,4-pentanedione and 3-methyl-2,4-pentanedione are preferred, and 2,4-pentanedione is more preferred.
- the ⁇ -ketoester is not particularly limited as long as it is a compound having a ketonic carbonyl group at the ⁇ -position of the carboxylic acid ester, and examples thereof include a compound represented by the following formula (4).
- R F and R G are each independently a monovalent organic group having 1 to 20 carbon atoms.
- R H is a hydrogen atom or a monovalent organic group having 1 to 20 carbon atoms.
- Examples of the monovalent organic group having 1 to 20 carbon atoms represented by R F , R G and R H are the same as those exemplified as the monovalent organic group of R B in the above formula (2). Groups and the like.
- R F is preferably a monovalent hydrocarbon group or a carbonyloxy hydrocarbon group-substituted hydrocarbon group, more preferably an alkyl group, an aryl group or an alkoxycarbonylalkyl group, and a methyl group, a phenyl group or a methoxycarbonylmethyl group. More preferred is a methyl group.
- R G is preferably a monovalent hydrocarbon group, more preferably an alkyl group, still more preferably a methyl group, an ethyl group, a propyl group, or a butyl group, and particularly preferably an ethyl group.
- the RH is preferably a hydrogen atom or a monovalent hydrocarbon group, more preferably a hydrogen atom or an alkyl group, still more preferably a hydrogen atom or a methyl group, and particularly preferably a hydrogen atom.
- ⁇ -ketoesters examples include acetoacetate ester, ⁇ -alkyl-substituted acetoacetate ester, ⁇ -ketopentanoate ester, benzoyl acetate ester, 1,3-acetone dicarboxylate ester and the like. Of these, acetoacetate is preferable, and ethyl acetoacetate is more preferable.
- the ⁇ -dicarboxylic acid ester is not particularly limited as long as it has a structure in which two ester groups (—COOR) are bonded to the same carbon atom.
- —COOR ester groups
- a compound represented by the following formula (5), etc. Is mentioned.
- R I and R J are each independently a monovalent organic group having 1 to 20 carbon atoms.
- RK is a hydrogen atom or a monovalent organic group having 1 to 20 carbon atoms.
- Examples of the monovalent organic group having 1 to 20 carbon atoms represented by R I , R J and R K are the same as those exemplified as the monovalent organic group of R B in the above formula (2). Groups and the like.
- a monovalent hydrocarbon group is preferable, an alkyl group is more preferable, a methyl group, an ethyl group, a propyl group, and a butyl group are further preferable, and an ethyl group is particularly preferable.
- R K a hydrogen atom, preferably a monovalent hydrocarbon group, a hydrogen atom, an alkyl group, a cycloalkyl group, more preferably an aryl group, a hydrogen atom, more preferably an alkyl group, a hydrogen atom is particularly preferred.
- ⁇ -dicarboxylic acid esters examples include malonic acid diesters, ⁇ -alkyl substituted malonic acid diesters, ⁇ -cycloalkyl substituted malonic acid diesters, ⁇ -aryl substituted malonic acid diesters, and the like. Among these, malonic acid diester is preferable, and diethyl malonate is more preferable.
- hydrocarbon having a ⁇ bond examples include: Chain olefins such as ethylene and propylene; Cyclic olefins such as cyclopentene, cyclohexene, norbornene; Chain dienes such as butadiene and isoprene; Cyclic dienes such as cyclopentadiene, methylcyclopentadiene, pentamethylcyclopentadiene, cyclohexadiene, norbornadiene; Examples thereof include aromatic hydrocarbons such as benzene, toluene, xylene, hexamethylbenzene, naphthalene, and indene.
- Chain olefins such as ethylene and propylene
- Cyclic olefins such as cyclopentene, cyclohexene, norbornene
- Chain dienes such as butadiene and isoprene
- Cyclic dienes such as cyclopentadiene, methylcycl
- Cyclopentadiene usually obtains one electron and forms a cyclopentadienyl anion, which is a multidentate ligand.
- the number of polydentate ligands coordinated to the metal atom is preferably 1 or 2 and more preferably 1 with respect to one metal atom.
- the number of this multidentate ligand shows the average number per metal atom.
- the metal compound may contain other ligands in addition to the bridging ligand and the polydentate ligand.
- the ligand etc. which are represented by X in the compound represented by Formula (1) mentioned later are mentioned, for example.
- the lower limit of the absolute molecular weight of the [A] metal compound measured by the static light scattering method is 8,000, preferably 10,000, more preferably 12,000, still more preferably 14,000, 000 is particularly preferred.
- the upper limit of the absolute molecular weight is 50,000, preferably 46,000, more preferably 40,000, still more preferably 32,000, and particularly preferably 28,000.
- the absolute molecular weight of a metal compound By making the absolute molecular weight of a metal compound into the said range, the said inorganic film forming composition can make a cleaning solvent removal property and volatilization suppression property into a higher level both.
- the absolute molecular weight of the metal compound is less than the lower limit, the volatilization inhibitory property of the inorganic film-forming composition tends to decrease.
- the absolute molecular weight of the metal compound exceeds the upper limit, the cleaning solvent removability of the inorganic film-forming composition tends to decrease.
- the absolute molecular weight of the [A] metal compound by a static light scattering method is a value measured by the following apparatus and conditions.
- the measurement method used was a multi-angle laser light scattering detector (MALLS) for injecting the sample solution into the flow cell, in addition to the method of setting the sample solution in the quartz cell as in the case of using the following apparatus.
- MALLS multi-angle laser light scattering detector
- Equipment Light scattering measurement device (“ALV-5000” from ALV, Germany) Measurement concentration: 2.5 mass%, 5.0 mass%, 7.5 mass%, 10.0 mass%, 4 points
- Standard liquid Toluene Measurement temperature: 23 ° C
- the refractive index of the solution and the density of the solution necessary for calculating the absolute molecular weight are values measured by the following apparatus.
- Measuring device for refractive index of solution Refractometer ("RA-500” of Kyoto Electronics Industry Co., Ltd.)
- Solution density measuring device Density / specific gravity meter ("DA-100” from
- the metal compound can be obtained, for example, by hydrolytic condensation of a compound represented by the following formula (1).
- M is a titanium atom, a tantalum atom, a zirconium atom or a tungsten atom.
- L is a multidentate ligand. a is an integer of 1 to 3. When a is 2 or more, the plurality of L may be the same or different.
- X is a halogen ligand, hydroxo ligand, carboxy ligand, alkoxy ligand, carboxylate ligand or amide ligand.
- b is an integer of 2 to 6. A plurality of X may be the same or different. However, a ⁇ 2 + b is 6 or less.
- Examples of the polydentate ligand represented by L include those exemplified as the polydentate ligand of the [A] metal compound. As said a, 1 or 2 is preferable and 1 is more preferable.
- halogen ligand represented by X examples include a fluorine ligand, a chlorine ligand, a bromine ligand, and an iodine ligand. Among these, a chlorine ligand is preferable.
- alkoxy ligand represented by X examples include a methoxy ligand (OMe), an ethoxy ligand (OEt), an n-propoxy ligand (n-OPr), and an i-propoxy ligand ( i-OPr), n-butoxy ligand (n-OBu) and the like. Of these, ethoxy ligands, i-propoxy ligands and n-butoxy ligands are preferred.
- Examples of the carboxylate ligand represented by X include formate ligand (OOCH), acetate ligand (OOCMe), propionate ligand (OOCEt), butyrate ligand (OOCPr), and the like. It is done. Of these, acetate ligands are preferred.
- Examples of the amide ligand represented by X include unsubstituted amide ligand (NH 2 ), methylamide ligand (NHMe), dimethylamide ligand (NMe 2 ), and diethylamide ligand (NEt 2 ). , Dipropylamide ligand (NPr 2 ) and the like. Among these, a dimethylamide ligand and a diethylamide ligand are preferable.
- B is preferably an integer of 2 to 4, more preferably 2 or 3, and even more preferably 2.
- the formed [A] metal compound can have a more linear structure, and as a result, the cleaning solvent stability of the inorganic film forming composition can be improved.
- the hydrolysis condensation reaction of the above compound can be performed, for example, in a solvent in the presence of water.
- the amount of water in this hydrolysis-condensation reaction is preferably 1 to 20 moles, more preferably 1 to 15 moles, relative to the above compound.
- the hydrolysis condensation reaction may be carried out by adding an acid such as maleic anhydride and / or an acid anhydride in addition to water from the viewpoint of hydrolysis reaction and condensation reaction acceleration.
- the solvent used in the above reaction is not particularly limited, and examples thereof include alcohol solvents, ketone solvents, amide solvents, ether solvents, ester solvents, hydrocarbon solvents and the like. Examples of these solvents include the respective solvents exemplified as the [B] solvent described later.
- alcohol solvents ether solvents, ester solvents, hydrocarbon solvents are preferable, monovalent aliphatic alcohols, alkylene glycol monoalkyl ethers, hydroxy acid esters, alkylene glycol monoalkyl ether carboxylates, lactones, Cyclic ethers and aromatic hydrocarbons are more preferred, monovalent aliphatic alcohols having 2 or more carbon atoms, alkylene glycol monoalkyl ethers having 6 or more carbon atoms, hydroxy acid esters having 4 or more carbon atoms, alkylene glycols having 6 or more carbon atoms.
- Ethanol, n-butanol, propylene glycol monomethyl ether, propylene Glycol monoethyl ether, propylene glycol monopropyl ether, ethyl lactate, propylene glycol monomethyl ether acetate, .gamma.-butyrolactone, tetrahydrofuran, toluene is particularly preferred.
- the solvent used for the reaction can be used as the [B] solvent of the inorganic film-forming composition as it is without being removed after the reaction.
- the temperature of the above reaction is preferably 0 ° C. to 150 ° C., more preferably 10 ° C. to 120 ° C.
- the reaction time is preferably 30 minutes to 24 hours, more preferably 1 hour to 20 hours, and even more preferably 2 hours to 15 hours.
- the above polydentate ligand such as ethyl lactate may be added to the reaction solution obtained by the hydrolysis condensation reaction.
- the metal compound includes, for example, a metal compound containing an alkoxy ligand, a metal compound containing a halogen ligand, and a multidentate ligand.
- a metal compound containing an alkoxy ligand a metal compound containing a halogen ligand
- a multidentate ligand a metal compound containing a halogen ligand
- the solvent can be used as long as it can dissolve or disperse the metal compound [A].
- solvents examples include alcohol solvents, ketone solvents, amide solvents, ether solvents, ester solvents, and the like. These solvent can be used individually by 1 type or in mixture of 2 or more types.
- the solvent may be used as it is without removing the solvent used in the reaction in the synthesis of the above-mentioned [A] metal compound.
- the alcohol solvent examples include methanol, ethanol, n-propanol, iso-propanol, n-butanol, iso-butanol, sec-butanol, tert-butanol, n-pentanol, iso-amyl alcohol, 2-methylbutanol, sec-pentanol, tert-pentanol, n-hexanol, 2-methylpentanol, sec-hexanol, 2-ethylbutanol, sec-heptanol, 3-heptanol, n-octanol, 2-ethylhexanol, sec-octanol, n-nonyl alcohol, 2,6-dimethyl-4-heptanol, n-decanol, sec-undecyl alcohol, trimethylnonyl alcohol, sec-tetradecyl alcohol, sec-heptadecyl alcohol Monohydric solvent
- ketone solvent examples include acetone, methyl ethyl ketone, methyl n-propyl ketone, methyl n-butyl ketone, diethyl ketone, methyl iso-butyl ketone, methyl n-pentyl ketone, ethyl n-butyl ketone, methyl n-hexyl ketone, diiso- Chain ketones such as butyl ketone and trimethylnonanone; Cyclic ketones such as cyclopentanone, cyclohexanone, cycloheptanone, cyclooctanone, methylcyclohexanone; Aromatic ketones such as acetophenone and phenyl ethyl ketone; And ⁇ -diketones such as acetonylacetone.
- amide solvent examples include Chain amides such as N-methylformamide, N, N-dimethylformamide, N, N-diethylformamide, acetamide, N-methylacetamide, N, N-dimethylacetamide, N-methylpropionamide; And cyclic amides such as N-methylpyrrolidone and N, N′-dimethylimidazolidinone.
- ether solvent for example, Dialiphatic ethers such as diethyl ether and dipropyl ether; Aromatic-aliphatic ethers such as anisole and phenylethyl ether; Diaromatic ethers such as diphenyl ether; Examples include cyclic ethers such as tetrahydrofuran, tetrahydropyran, and dioxane.
- ester solvents include: Methyl acetate, ethyl acetate, n-propyl acetate, iso-propyl acetate, n-butyl acetate, iso-butyl acetate, sec-butyl acetate, n-pentyl acetate, sec-pentyl acetate, 3-methoxybutyl acetate, methyl pentyl acetate 2-ethylbutyl acetate, 2-ethylhexyl acetate, benzyl acetate, cyclohexyl acetate, methyl cyclohexyl acetate, n-nonyl acetate, ethyl propionate, n-butyl propionate, iso-amyl propionate, methyl acetoacetate, ethyl acetoacetate, etc.
- Monocarboxylic acid esters of Dicarboxylic acid esters such as diethyl oxalate, di-n-butyl oxalate, diethyl malonate, dimethyl phthalate, diethyl phthalate; Ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monopropyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, propylene glycol monobutyl ether acetate, propylene glycol propionate
- Alkylene glycol monoalkyl ether carboxylates such as monomethyl ether; Ether group-containing alkylene glycol monoalkyl ether carboxy such as diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol mono-n-but
- alcohol solvents and ester solvents are preferable from the viewpoint of excellent applicability of the inorganic film-forming composition.
- the alcohol solvent is preferably a monovalent aliphatic alcohol or alkylene glycol monoalkyl ether, more preferably a monovalent aliphatic alcohol having 4 or more carbon atoms, or an alkylene glycol monoalkyl ether having 4 or more carbon atoms, butanol, isoamyl. More preferred are alcohol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, and propylene glycol monopropyl ether.
- ester solvents hydroxy acid esters, lactones, alkylene glycol monoalkyl ether carboxylates, ether group-containing alkylene glycol monoalkyl ether carboxylates are preferred, hydroxy acid esters having 4 or more carbon atoms, lactones having 4 or more carbon atoms, carbon A monocarboxylic acid ester of alkylene glycol monoalkyl ether having a number of 6 or more is more preferred, and ethyl lactate, ⁇ -butyrolactone, and propylene glycol monomethyl ether acetate are more preferred.
- the content of the solvent is such that the content of the [A] metal compound in the inorganic film-forming composition is usually 0.1% by mass to 50% by mass, and 0.5% by mass.
- the content is preferably from 30% by mass to 30% by mass, more preferably from 1% by mass to 15% by mass, and even more preferably from 2% by mass to 10% by mass.
- the said inorganic film forming composition can improve storage stability and applicability
- the inorganic film-forming composition may further contain a [C] crosslinking accelerator.
- the crosslinking accelerator is a compound that generates an acid or a base by light or heat, and the inorganic film forming composition further contains [C] a crosslinking accelerator, so that resist pattern formability and etching selection are achieved. Can be improved.
- Examples of the crosslinking accelerator include onium salt compounds and N-sulfonyloxyimide compounds.
- the crosslinking accelerator is preferably a thermal crosslinking accelerator that generates an acid or a base by heat, and among them, an onium salt compound is preferable.
- onium salt compounds examples include sulfonium salts, tetrahydrothiophenium salts, iodonium salts, ammonium salts, and the like.
- sulfonium salt examples include triphenylsulfonium trifluoromethanesulfonate, triphenylsulfonium nonafluoro-n-butanesulfonate, triphenylsulfonium perfluoro-n-octanesulfonate, triphenylsulfonium 2-bicyclo [2.2.1] hept- 2-yl-1,1,2,2-tetrafluoroethanesulfonate, 4-cyclohexylphenyldiphenylsulfonium trifluoromethanesulfonate, 4-cyclohexylphenyldiphenylsulfonium nonafluoro-n-butanesulfonate, 4-cyclohexylphenyldiphenylsulfonium perfluoro- n-octanesulfonate, 4-cyclohexylphenyldiphenylsulfonium 2-bicyclo [2.
- tetrahydrothiophenium salt examples include 1- (4-n-butoxynaphthalen-1-yl) tetrahydrothiophenium trifluoromethanesulfonate, 1- (4-n-butoxynaphthalen-1-yl) tetrahydrothiophenium nona.
- iodonium salt examples include diphenyliodonium trifluoromethanesulfonate, diphenyliodonium nonafluoro-n-butanesulfonate, diphenyliodonium perfluoro-n-octanesulfonate, diphenyliodonium 2-bicyclo [2.2.1] hept-2-yl- 1,1,2,2-tetrafluoroethanesulfonate, bis (4-t-butylphenyl) iodonium trifluoromethanesulfonate, bis (4-t-butylphenyl) iodonium nonafluoro-n-butanesulfonate, bis (4-t -Butylphenyl) iodonium perfluoro-n-octanesulfonate, bis (4-t-butylphenyl) iodonium 2-bicyclo [2.2.1] hept-2-yl-1,1,2,
- ammonium salts include ammonium formate, ammonium maleate, ammonium fumarate, ammonium phthalate, ammonium malonate, ammonium succinate, ammonium tartrate, ammonium malate, ammonium lactate, ammonium citrate, ammonium acetate, ammonium propionate, Ammonium butanoate, ammonium pentanoate, ammonium hexanoate, ammonium heptanoate, ammonium octanoate, ammonium nonanoate, ammonium decanoate, ammonium oxalate, ammonium adipate, ammonium sebacate, ammonium butyrate, ammonium oleate, ammonium stearate , Ammonium linoleate, ammonium linolenate, ammonium salicylate, Ammonium Nsuruhon acid, ammonium benzoate, ammonium p- aminobenzoic acid, ammoni
- ammonium ion of the above ammonium salt is methylammonium ion, dimethylammonium ion, trimethylammonium ion, tetramethylammonium ion, ethylammonium ion, diethylammonium ion, triethylammonium ion, tetraethylammonium ion, propylammonium ion, dipropylammonium Ion, tripropylammonium ion, tetrapropylammonium ion, butylammonium ion, dibutylammonium ion, tributylammonium ion, tetrabutylammonium ion, trimethylethylammonium ion, dimethyldiethylammonium ion, dimethylethylpropylammonium ion, methylethylpropylbutylammonium i
- Undec-7-ene p-toluenesulfonate 1,8-diazabicyclo [5.4.0] undec-7-ene salt, 1,5-diazabicyclo [4.3.0] -5 -1,5-diazabicyclo [4.3.0] -5-nonene salts such as nonene formate and 1,5-diazabicyclo [4.3.0] -5-nonene p-toluenesulfonate .
- N-sulfonyloxyimide compounds include N- (trifluoromethanesulfonyloxy) bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (nonafluoro-n-butanesulfonyloxy).
- onium salt compounds are preferable, iodonium salts and ammonium salts are more preferable, and diphenyliodonium trifluoromethanesulfonate and tetramethylammonium acetate are more preferable.
- crosslinking accelerators may be used alone or in combination of two or more.
- the content of the crosslinking accelerator is preferably from 0 to 10 parts by weight, more preferably from 0.1 to 5 parts by weight, based on 100 parts by weight of the [A] metal compound.
- content of a crosslinking accelerator By making content of a crosslinking accelerator into the said range, the resist pattern formation property and etching selectivity of the said inorganic film forming composition can be improved more.
- the said inorganic film formation composition may contain other arbitrary components, such as surfactant, in the range which does not impair the effect of this invention.
- a surfactant is a component that exhibits an effect of improving coatability, striation and the like.
- the surfactant include polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene n-octylphenyl ether, polyoxyethylene n-nonylphenyl ether, polyethylene glycol dilaurate, polyethylene glycol diacrylate.
- nonionic surfactants such as stearate, the following trade names are KP341 (Shin-Etsu Chemical Co., Ltd.), Polyflow No. 75, no.
- Surfactants may be used alone or in combination of two or more. Moreover, the compounding quantity of surfactant can be suitably determined according to the objective.
- the inorganic film-forming composition can be prepared, for example, by mixing [A] metal compound and [B] solvent, and [C] crosslinking accelerator and other optional components, if necessary, at a predetermined ratio.
- the inorganic film forming composition may be prepared using the solvent used in the synthesis of the metal compound [A] as it is as the solvent [B].
- the inorganic film-forming composition is usually prepared by dissolving in a solvent upon use and then filtering with a filter having a pore size of about 0.2 ⁇ m, for example.
- the pattern forming method is: Forming an inorganic film on the upper surface side of the substrate (hereinafter, also referred to as “inorganic film forming process”), A step of forming a resist pattern on the upper surface side of the inorganic film (hereinafter also referred to as a “resist pattern forming step”), and a step of forming a pattern on the substrate by one or more dry etching using the resist pattern as a mask (Hereinafter also referred to as “substrate pattern forming process”) With The said inorganic film is formed with the said inorganic film formation composition for multilayer resist processes.
- the inorganic film forming composition described above since the inorganic film forming composition described above is used, the inorganic having excellent resist pattern forming property and etching selectivity while exhibiting both excellent cleaning solvent removal property and volatilization suppressing property. A film can be formed. In addition, even when the resist pattern is thinned, it is possible to suppress the disappearance, loss of shape, bending, and the like of the resist pattern, and faithful pattern transfer is possible.
- the resist pattern forming step A step of laminating an antireflection film on the inorganic film and a step of forming a resist pattern on the laminated antireflection film may be included.
- the resist pattern formability can be further improved by forming an antireflection film.
- Step of forming a resist underlayer film on a substrate (hereinafter also referred to as “resist underlayer film forming step”) Further comprising It is also preferable to form an inorganic film on the resist underlayer film in the inorganic film forming step.
- the inorganic film forming composition has excellent etching selectivity with respect to an organic material, it is possible to transfer a resist pattern by sequentially dry-etching an inorganic film and a resist underlayer film that is an organic film. Become. Hereinafter, each step will be described.
- an inorganic film is formed on the upper surface side of the substrate with the inorganic film forming composition.
- the substrate include insulating films such as silicon oxide, silicon nitride, silicon oxynitride, and polysiloxane, and commercially available products such as black diamond (AMAT), silk (Dow Chemical), and LKD5109 (JSR).
- An interlayer insulating film such as a wafer coated with a dielectric insulating film can be used.
- a patterned substrate such as a wiring course (trench), a plug groove (via), or the like may be used.
- the said inorganic film forms a coating film by apply
- the method for applying the inorganic film forming composition include spin coating, roll coating, and dipping.
- the temperature for the heat treatment is usually 150 ° C. to 500 ° C., preferably 180 ° C. to 350 ° C.
- the heat treatment time is usually 30 seconds to 1,200 seconds, preferably 45 seconds to 600 seconds.
- the conditions of the ultraviolet light irradiation are appropriately selected according to the composition of the inorganic film forming composition.
- the thickness of the formed inorganic film is usually about 5 nm to 50 nm.
- resist underlayer film forming step Moreover, you may have the process of forming the resist underlayer film which is an organic film on a board
- the resist underlayer film forming composition conventionally known compositions can be used, and examples thereof include NFC HM8005 (JSR).
- JSR NFC HM8005
- the resist underlayer film is formed by applying a resist underlayer film forming composition on a substrate, and this coating film is cured, dried, etc. by heat treatment, or irradiation with ultraviolet light and heat treatment. Can be formed. Examples of the method for applying the resist underlayer film forming composition include spin coating, roll coating, and dipping. The temperature for the heat treatment is usually 150 ° C.
- the heat treatment time is usually 30 seconds to 1,200 seconds, preferably 45 seconds to 600 seconds.
- the conditions of the ultraviolet light irradiation are appropriately selected according to the composition of the resist underlayer film forming composition.
- the thickness of the resist underlayer film to be formed is usually about 50 nm to 500 nm.
- the other lower layer film is a film provided with an antireflection function, coating film flatness, high etching resistance against a fluorine-based gas such as CF 4, and the like.
- a commercial product such as NFC HM8005 (JSR) can be used.
- resist pattern formation process In this step, a resist pattern is formed on the upper surface side of the formed inorganic film.
- Examples of the method for forming this resist pattern include (A) a method using a resist composition, (B) a method performed by a nanoimprint lithography method, and the like. Each will be described below.
- the resist pattern forming step A step of forming a resist film on the upper surface side of the inorganic film with a resist composition (hereinafter, also referred to as “resist film forming step”), A step of exposing the resist film (hereinafter also referred to as “exposure step”), and a step of developing the exposed resist film (hereinafter also referred to as “development step”). including.
- resist film forming step A step of forming a resist film on the upper surface side of the inorganic film with a resist composition
- exposure step A step of exposing the resist film
- development step a step of developing the exposed resist film
- a resist film is formed on the upper surface side of the inorganic film with a resist composition.
- the resist composition include a resist composition containing a polymer having an acid dissociable group and a radiation-sensitive acid generator, a positive resist composition containing an alkali-soluble resin and a quinonediazide-based photosensitizer, an alkali Examples thereof include a negative resist composition containing a soluble resin and a crosslinking agent.
- a commercially available resist composition can also be used.
- As a method of applying the resist composition it can be applied by a conventional method such as a spin coating method.
- coat is adjusted so that the resist film obtained may become a desired film thickness.
- the formation of the resist film may be performed by laminating an antireflection film on the inorganic film and on the laminated antireflection film.
- the resist film can be formed by pre-baking (PB) a coating film formed by applying the resist composition, thereby volatilizing the solvent in the coating film and drying it.
- PB pre-baking
- the temperature of PB is appropriately adjusted according to the type of resist composition to be used, but is preferably 30 ° C. to 200 ° C., more preferably 50 ° C. to 150 ° C.
- the PB time is usually 30 seconds to 200 seconds, preferably 45 seconds to 120 seconds.
- the thickness of the resist film to be formed is usually 1 nm to 500 nm, preferably 10 nm to 300 nm. Further, another film may be provided on the surface of the resist film.
- the formed resist film is exposed.
- This exposure is usually performed by selectively irradiating the resist film with radiation through a photomask.
- the radiation used for the exposure depends on the type of acid generator used in the resist composition, for example, electromagnetic waves such as visible light, ultraviolet light, far ultraviolet light, X-rays and ⁇ rays; electron beams, molecular beams, ions
- electromagnetic waves such as visible light, ultraviolet light, far ultraviolet light, X-rays and ⁇ rays
- electron beams molecular beams, ions
- KrF excimer laser light (248 nm), ArF excimer laser light (193 nm), F 2 excimer laser light (wavelength 157 nm), Kr 2 excimer laser light (Wavelength 147 nm), ArKr excimer laser light (wavelength 134 nm), extreme ultraviolet light (wavelength 13 nm, etc.) are more preferable.
- an immersion exposure method can also be employed.
- the liquid immersion upper film
- post-baking is preferably performed in order to improve the resolution, pattern profile, developability, etc. of the resist film.
- the post-baking temperature is appropriately adjusted according to the type of the resist composition used, but is preferably 50 ° C. to 180 ° C., more preferably 70 ° C. to 150 ° C.
- the post-baking time is usually 30 seconds to 200 seconds, preferably 45 seconds to 120 seconds.
- the exposed resist film is developed.
- the developer used for development can be appropriately selected depending on the type of resist composition used.
- a resist composition containing the polymer having an acid dissociable group and a radiation sensitive acid generator or a positive resist composition containing an alkali-soluble resin for example, sodium hydroxide, potassium hydroxide, carbonic acid Sodium, sodium silicate, sodium metasilicate, ammonia, ethylamine, n-propylamine, diethylamine, di-n-propylamine, triethylamine, methyldiethylamine, dimethylethanolamine, triethanolamine, tetramethylammonium hydroxide (TMAH), tetraethyl
- alkaline aqueous solutions such as ammonium hydroxide, pyrrole, piperidine, choline, 1,8-diazabicyclo [5.4.0] -7-undecene, 1,5-diazabicyclo [4.3.0
- TMAH aqueous solution is preferable.
- alkaline aqueous solutions may be those obtained by adding a suitable amount of a water-soluble organic solvent, for example, an alcohol such as methanol or ethanol, or a surfactant.
- a liquid containing an organic solvent can be used as the developer, and a negative resist pattern. Can be formed.
- a resist composition containing a polymer having an acid-dissociable group and using a developer containing an organic solvent, a finer resist pattern can be formed.
- a pattern of the substrate can be formed.
- said organic solvent the thing similar to the solvent illustrated as a [B] solvent of the said inorganic film formation composition etc. are mentioned, for example. Of these, ester solvents are preferred, and butyl acetate is more preferred.
- a negative chemically amplified resist composition and a negative resist composition containing an alkali-soluble resin for example, sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium metasilicate, aqueous ammonia, etc.
- Inorganic alkalis primary amines such as ethylamine and n-propylamine, secondary amines such as diethylamine and di-n-butylamine, tertiary amines such as triethylamine and methyldiethylamine, dimethylethanolamine and triethanolamine Alcohol amines, tetramethylammonium hydroxide, tetraethylammonium hydroxide, quaternary ammonium salts such as choline, and alkaline aqueous solutions such as pyrrole, piperidine and other cyclic amines.
- primary amines such as ethylamine and n-propylamine
- secondary amines such as diethylamine and di-n-butylamine
- tertiary amines such as triethylamine and methyldiethylamine, dimethylethanolamine and triethanolamine
- Alcohol amines tetramethylammonium hydroxide,
- the resist pattern forming method is: A step of forming a resist pattern on the inorganic film using a resist composition by nanoimprint lithography (hereinafter, also referred to as “resist pattern formation step by nanoimprint lithography”) including.
- resist pattern formation step by nanoimprint lithography A step of forming a resist pattern on the inorganic film using a resist composition by nanoimprint lithography (hereinafter, also referred to as “resist pattern formation step by nanoimprint lithography”) including.
- resist pattern formation step by nanoimprint lithography hereinafter, this process will be described.
- this step is a step of forming a pattern formation layer on the inorganic film (hereinafter also referred to as “pattern formation layer formation step”), and a step of hydrophobizing the surface of the mold having a reverse pattern on the surface ( Hereinafter, it is also referred to as “hydrophobizing process”, a process of pressing the surface of the mold subjected to hydrophobic processing to the pattern forming layer (hereinafter also referred to as “pressing process”), and pattern formation with the mold pressed.
- the method includes a step of exposing a layer (hereinafter also referred to as “exposure step”) and a step of peeling the mold from the exposed pattern forming layer (hereinafter also referred to as “peeling step”).
- exposure step a step of exposing a layer
- peeling step a step of peeling the mold from the exposed pattern forming layer
- a pattern formation layer is formed on the inorganic film.
- the component constituting the pattern forming layer is a radiation-sensitive composition for nanoimprinting.
- the pattern forming layer can contain a curing accelerator and the like.
- the curing accelerator include a radiation-sensitive curing accelerator and a thermosetting accelerator.
- a radiation sensitive curing accelerator is preferable.
- the radiation-sensitive curing accelerator can be appropriately selected depending on the structural unit constituting the radiation-sensitive composition for nanoimprint, and examples thereof include a photoacid generator, a photobase generator, and a photosensitizer.
- a radiation sensitive hardening accelerator may be used independently and may use 2 or more types together.
- Examples of the method for applying the radiation-sensitive composition include an inkjet method, a dip coating method, an air knife coating method, a curtain coating method, a wire barcode method, a gravure coating method, an extrusion coating method, a spin coating method, and a slit scan. Law.
- the surface of the mold having a reverse pattern on the surface is subjected to a hydrophobic treatment.
- the mold needs to be made of a light transmissive material.
- the light transmissive material include a light transparent resin such as glass, quartz, PMMA, and polycarbonate resin; a transparent metal vapor deposited film; a flexible film such as polydimethylsiloxane; a photocured film; and a metal film.
- a release agent is used for the hydrophobization treatment.
- the release agent include silicon release agents, fluorine release agents, polyethylene release agents, polypropylene release agents, paraffin release agents, montan release agents, carnauba release agents, and the like. Is mentioned.
- a mold release agent may be used independently and may use 2 or more types together. Of these, silicon-based release agents are preferred. Examples of the silicon release agent include polydimethylsiloxane, acrylic silicone graft polymer, acrylic siloxane, and arylsiloxane.
- the pressure at the time of press-contacting the mold is usually 0.1 MPa to 100 MPa, preferably 0.1 MPa to 50 MPa, more preferably 0.1 MPa to 30 MPa.
- the pressure contact time is usually 1 second to 600 seconds, preferably 1 second to 300 seconds, and more preferably 1 second to 180 seconds.
- the pattern forming layer is exposed in a state where the mold is pressed.
- the pattern forming layer which consists of a radiation sensitive composition for nanoimprint hardens
- the concavo-convex pattern it can be used, for example, as a film for an interlayer insulating film of a semiconductor element such as LSI, system LSI, DRAM, SDRAM, RDRAM, or D-RDRAM, a resist film or the like when manufacturing the semiconductor element.
- thermosetting when the pattern forming layer has thermosetting properties, heat curing may be further performed.
- the heating atmosphere, heating temperature, and the like are not particularly limited. For example, heating can be performed at 40 ° C. to 200 ° C. in an inert atmosphere or under reduced pressure. Heating can be performed using a hot plate, oven, furnace, or the like.
- the mold is peeled from the exposed pattern forming layer.
- the peeling method is not particularly limited.
- the base material may be fixed and the mold may be moved away from the base material, or the mold may be fixed and the base material may be moved away from the mold to be peeled off. Alternatively, both of them may be peeled by pulling in the opposite direction.
- a pattern is formed on the substrate by one or more dry etchings using the resist pattern as a mask.
- the resist underlayer film is formed, the inorganic film, the resist underlayer film, and the substrate to be processed are sequentially dry-etched using the resist pattern as a mask to form a pattern. Dry etching can be performed using a known dry etching apparatus.
- the source gas during dry etching depends on the elemental composition of the object to be etched, but includes oxygen atoms such as O 2 , CO, and CO 2 , inert gases such as He, N 2 , and Ar, Cl 2 , chlorine gas such as BCl 3 , fluorine gas such as CHF 3 and CF 4 , gas of H 2 and NH 3 , etc. can be used. In addition, these gases can also be mixed and used.
- M-1 Titanium (IV) diisopropoxybis (2,4-pentanedionate) (75% strength by weight 2-propanol solution)
- M-2 Titanium (IV) diisopropoxybis (ethyl acetoacetate)
- M-3 Zirconium (IV), di-n-butoxide, bis (2,4-pentanedionate) (60% by weight butanol solution)
- M-4 Tantalum (V) tetraethoxy (2,4-pentanedionate)
- M-5 Bis (cyclopentadienyl) tungsten (IV) dichloride
- the absolute molecular weight of the [A] metal compound contained in this solution by a static light scattering measurement method was 24,500.
- This solution was diluted with propylene glycol monoethyl ether to prepare a solution (S-1) of [A] metal compound having a solid content concentration of 3% by mass.
- the absolute molecular weight of the metal compound contained in this solution by a static light scattering measurement method was 6,000.
- This solution was diluted with propylene glycol monomethyl ether to prepare a metal compound solution (CS-1) having a solid concentration of 3% by mass.
- the absolute molecular weight of the [A] metal compound contained in this solution by a static light scattering measurement method was 8,600.
- This solution was diluted with propylene glycol monomethyl ether acetate to prepare a solution (S-2) of [A] metal compound having a solid content concentration of 3% by mass.
- the absolute molecular weight of the metal compound contained in this solution by a static light scattering measurement method was 86,700.
- This solution was diluted with propylene glycol acetate monomethyl ether to prepare a metal compound solution (CS-2) having a solid content concentration of 3% by mass.
- the absolute molecular weight of the [A] metal compound contained in this solution by a static light scattering measurement method was 45,000.
- This solution was diluted with 1-butanol to prepare a solution (S-3) of [A] metal compound having a solid content concentration of 3% by mass.
- the absolute molecular weight of the metal compound contained in this solution by static light scattering measurement was 2,500.
- This solution was diluted with propylene glycol monopropyl ether to prepare a metal compound solution (CS-3) having a solid concentration of 3% by mass.
- the absolute molecular weight of the [A] metal compound contained in this solution by a static light scattering measurement method was 13,000. This solution was diluted with ethyl lactate to prepare a solution (S-5) of [A] metal compound having a solid content concentration of 3% by mass.
- Example 1 100.0 parts by mass of the obtained metal compound (S-1) solution was filtered through a filter having a pore size of 0.2 ⁇ m to prepare an inorganic film forming composition (J-1) for multilayer resist process.
- Examples 2 to 5 and Comparative Examples 1 to 3 The same operation as in Example 1 was carried out except that 100.0 parts by mass of a metal compound solution of the type shown in Table 1 below was used, and if necessary, the type and amount of the [C] cross-linking accelerator shown in Table 1 was used.
- inorganic film forming compositions (J-2) to (J-5) and (CJ-1) to (CJ-3) for a multilayer resist process were prepared. “-” Indicates that the corresponding component was not used.
- An inorganic film forming composition for a multilayer resist process was applied on an 8-inch silicon wafer as a substrate by a spin coater to form a coating film.
- a blank 8-inch silicon wafer was placed directly above the coating film on the substrate with a surface of the coating film side through a 0.75 mm spacer.
- the coated substrate paired with the blank wafer was heated at 250 ° C. for 5 minutes, and components that volatilized from the coating film were captured by the blank wafer.
- the central part of the blank wafer used for capturing was cut into a 1 cm square, and the surface of the cut part was etched with 0.1 mL of a 12.5% by mass hydrofluoric acid aqueous solution.
- resist pattern formability (Resist composition-alkaline aqueous solution development)
- a resist underlayer film forming composition (“NFC HM8005” manufactured by JSR Corporation) is applied onto a silicon wafer as a substrate by a spin coater and dried on a hot plate at 250 ° C. for 60 seconds to form a resist underlayer having a film thickness of 300 nm.
- a film was formed.
- An inorganic film forming composition for a multilayer resist process was applied onto the formed resist underlayer film by a spin coater and baked on a hot plate at 250 ° C. for 60 seconds to form an inorganic film having a thickness of 20 nm.
- a resist composition (“ARX2014J” from JSR) was applied on the formed inorganic film and dried at 90 ° C. for 60 seconds to form a resist film having a thickness of 100 nm.
- a liquid immersion upper layer film forming composition (“NFC TCX091-7” manufactured by JSR) was applied onto the formed resist film and dried at 90 ° C. for 60 seconds to form a liquid immersion upper layer film having a thickness of 30 nm.
- the resist pattern formability is “ In the case of “A (good)” and a hem-extended shape, “B (defect)” was evaluated.
- Pattern transfer was performed by sequentially dry-etching the inorganic film and the substrate using the formed resist pattern as a mask using a dry etching apparatus (“Telius SCCM” manufactured by Tokyo Electron Ltd.).
- a resist underlayer film forming composition (“NFC HM8005” manufactured by JSR Corporation) is applied onto a silicon wafer as a substrate by a spin coater and dried on a hot plate at 250 ° C. for 60 seconds to form a resist underlayer having a film thickness of 300 nm. A film was formed.
- An inorganic film forming composition for a multilayer resist process was applied onto the formed resist underlayer film by a spin coater and baked on a hot plate at 250 ° C. for 60 seconds to form an inorganic film having a thickness of 20 nm.
- a resist composition (“ARX2014J” from JSR) was applied on the formed inorganic film and dried at 90 ° C.
- a liquid immersion upper layer film forming composition (“NFC TCX091-7” manufactured by JSR) was applied onto the formed resist film and dried at 90 ° C. for 60 seconds to form a liquid immersion upper layer film having a thickness of 30 nm.
- the immersion exposure method is used. After exposure with an exposure amount of 16 mJ / cm 2, the substrate including the resist film was heated at 115 ° C. for 60 seconds.
- a 40 nm 1L / 1S resist pattern was formed by spin-drying at 2,000 rpm for 15 seconds.
- the resist pattern formability is “A ( “Good”) and “B (defect)” when the skirt spreads.
- the inorganic film and the substrate were sequentially dry-etched using a dry etching apparatus (“Telius SCCM” manufactured by Tokyo Electron Ltd.) to perform pattern transfer.
- the inorganic film was etched by the following two methods, and the etching selectivity was evaluated.
- Conditions for etching a silicon dioxide film at a rate of 100 nm per minute the initial film thickness of the inorganic film
- the etching selectivity was evaluated as “A (good)” when the difference in film thickness after etching was less than 5 nm, and “B (defect)” when the difference was 5 nm or more.
- the inorganic film formed from the inorganic film forming composition can function well as a mask film when processing each film.
- the inorganic film forming composition for multilayer resist process of the examples has good solubility in the solvent for cleaning the substrate edge and the back surface even in the inorganic film after coating spin drying. Moreover, volatilization of inorganic components during baking is suppressed. Further, it can be seen that the formed inorganic film has excellent etching selectivity and excellent resist pattern formability.
- the etching resistance under the silicon dioxide film etching conditions of Example 5 is poor, but this is because the tungsten oxide film obtained by baking is easily etched under the etching conditions of the silicon dioxide film. Therefore, in the case of Example 5, it can be said that it is effective only as a mask at the time of resist underlayer film etching processing.
- the volatilization suppression property is poor, but this is easy by heating even after coating spin drying because the absolute molecular weight of the metal compound is small. This is thought to be due to the fact that many components that volatilize are contained.
- Comparative Example 2 it is considered that the cleaning solvent removability in the inorganic film after coating spin drying is poor due to the absolute molecular weight of the metal compound being too large.
- the present invention is a multilayer having good solubility in a solvent for substrate edge and back surface cleaning after coating spin drying, no volatilization derived from inorganic substances during film baking, and excellent resist pattern formation and etching selectivity.
- An inorganic film forming composition for a resist process and a pattern forming method can be provided. Therefore, in the multilayer resist process using the inorganic film-forming composition, it is excellent in removal performance by an organic solvent in a portion where the film on the substrate after coating rotation is to be removed, and the organic matter is not contaminated in the chamber with inorganic substances during baking. Even when the film is thinned, disappearance of resist pattern, loss of shape, bending, and the like can be suppressed, and faithful pattern transfer is possible. Therefore, the present invention can be used very suitably in an LSI manufacturing process that is expected to be further miniaturized in the future, particularly in the formation of fine contact holes and the like.
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Abstract
Description
当該多層レジストプロセス用無機膜形成組成物(以下、単に「当該無機膜形成組成物」ともいう)は、[A]金属化合物及び[B]溶媒を含有する。当該無機膜形成組成物は、好適成分として、架橋促進剤(以下、「[C]架橋促進剤」ともいう)を含有していてもよく、本発明の効果を損なわない範囲において、その他の任意成分を含有していてもよい。
以下、各成分について説明する。
[A]金属化合物は、チタン、タンタル、ジルコニウム及びタングステンからなる群より選ばれる少なくとも1種の複数の金属原子(以下、「特定金属原子」ともいう)と、上記複数の金属原子間を架橋する酸素原子(以下、「架橋酸素原子」ともいう)と、上記金属原子に配位する多座配位子とを含み、静的光散乱法によって測定される絶対分子量が、8,000以上50,000以下である。
[A]金属化合物は、上述のように、複数の特定金属原子と架橋酸素原子とを有し、多座配位子が上記特定金属原子に配位している錯体(複核錯体)である。
当該無機膜形成組成物は、[A]金属化合物を含有することで、レジストパターン形成性及びエッチング選択性に優れる無機膜を形成でき、かつ洗浄溶剤除去性と揮発抑制性とに共に優れる。
以下[A]金属化合物を構成する特定金属原子、架橋酸素原子、多座配位子の順に説明する。
[A]金属化合物は、複数の金属原子を含んでいる。この金属原子は、チタン、タンタル、ジルコニウム及びタングステンからなる群より選ばれる少なくとも1種である。[A]金属化合物の金属原子を上記元素のものとすることで、当該無機膜形成組成物から形成される無機膜は、レジストパターン形成性及びエッチング選択性に優れる。上記複数の特定金属原子は、1種の元素の原子からなっていてもよく、2種以上の元素の原子からなっていてもよいが、微細パターン形成後の無機膜エッチング転写加工時のエッチング速度がナノメートルオーダーのレベルで面内均一であることが望ましい点からは、1種の元素の原子からなっていることが好ましい。
[A]金属化合物は、上記複数の金属原子間を架橋する酸素原子を含んでいる。[A]金属化合物は、このような上記特定金属原子を架橋する酸素原子を含むことで、安定な複核の金属化合物となることができ、その結果、当該無機膜形成組成物から形成される無機膜は、レジストパターン形成性及びエッチング選択性に優れる。上記架橋酸素原子は、1個の金属原子に対して1個結合していてもよく、複数個結合していてもよいが、金属原子に2個の架橋酸素原子が結合している構造を主に含んでいることが好ましい。金属原子に2個の架橋酸素原子が結合している構造を主に含むことで、[A]金属化合物を-M-O-M-O-(Mは特定金属原子である)のように、より直鎖状の構造として溶解性を向上させることができ、その結果、当該無機膜形成組成物の洗浄溶剤除去性を向上させることができる。上記構造を「主に含む」とは、[A]金属化合物を構成する全金属原子の50モル%以上、好ましくは70モル%以上、さらに好ましくは90モル%以上、特に好ましくは95モル%以上が上記構造を有していることをいう。
[A]金属化合物は、上記金属原子に配位する多座配位子を含んでいる。[A]金属化合物は、このような多座配位子を含むことで、溶解性を高めることができ、その結果、当該無機膜形成組成物は洗浄溶剤除去性に優れる。
上記1価又は2価のヘテロ原子含有基が有するヘテロ原子としては、例えば、酸素原子、窒素原子、イオウ原子、ケイ素原子、リン原子等が挙げられる。
上記2価のヘテロ原子含有基としては、例えば、-O-、-S-、-CO-、-CS-、-NR’-、これらを組み合わせた基等が挙げられる。R’は、水素原子又は炭素数1~10の1価の炭化水素基である。
上記1価のヘテロ原子含有基としては、例えば、ヒドロキシ基、スルファニル基(-SH)、アミノ基、シアノ基、カルボキシ基、ケト基(=O)等が挙げられる。
上記RBで表される1価の有機基としては、例えば、上記RAの2価の有機基として例示した基に水素原子を1個加えた基等が挙げられる。
上記RBとしては、1価の炭化水素基が好ましく、アルキル基がより好ましく、メチル基、エチル基、プロピル基、ブチル基がさらに好ましく、エチル基が特に好ましい。
上記REとしては、水素原子、1価の炭化水素基が好ましく、水素原子、アルキル基がより好ましく、水素原子、メチル基がさらに好ましく、水素原子が特に好ましい。
上記RGとしては、1価の炭化水素基が好ましく、アルキル基がより好ましく、メチル基、エチル基、プロピル基、ブチル基がさらに好ましく、エチル基が特に好ましい。
上記RHとしては、水素原子、1価の炭化水素基が好ましく、水素原子、アルキル基がより好ましく、水素原子、メチル基がさらに好ましく、水素原子が特に好ましい。
上記RKとしては、水素原子、1価の炭化水素基が好ましく、水素原子、アルキル基、シクロアルキル基、アリール基がより好ましく、水素原子、アルキル基がさらに好ましく、水素原子が特に好ましい。
エチレン、プロピレン等の鎖状オレフィン;
シクロペンテン、シクロヘキセン、ノルボルネン等の環状オレフィン;
ブタジエン、イソプレン等の鎖状ジエン;
シクロペンタジエン、メチルシクロペンタジエン、ペンタメチルシクロペンタジエン、シクロヘキサジエン、ノルボルナジエン等の環状ジエン;
ベンゼン、トルエン、キシレン、ヘキサメチルベンゼン、ナフタレン、インデン等の芳香族炭化水素などが挙げられる。
これらの中で、環状ジエンが好ましく、シクロペンタジエンがより好ましい。シクロペンタジエンは、通常1個の電子を得て多座配位子であるシクロペンタジエニルアニオンを形成する。
[A]金属化合物の絶対分子量を上記範囲とすることにより、当該無機膜形成組成物は、洗浄溶剤除去性と揮発抑制性とを共により高いレベルにすることができる。
[A]金属化合物の絶対分子量が上記下限未満だと、当該無機膜形成組成物の揮発抑制性が低下する傾向にある。[A]金属化合物の絶対分子量が上記上限を超えると、当該無機膜形成組成物の洗浄溶剤除去性が低下する傾向にある。
装置:光散乱測定装置(ドイツALV社の「ALV-5000」)
測定濃度:2.5質量%、5.0質量%、7.5質量%、10.0質量%の4点
標準液体:トルエン
測定温度:23℃
絶対分子量の算出に必要な溶液の屈折率及び溶液の密度は、下記装置により測定される値である。
溶液の屈折率の測定装置:屈折計(京都電子工業社の「RA-500」)
溶液の密度の測定装置:密度比重計(京都電子工業社の「DA-100」)
[A]金属化合物は、例えば、下記式(1)で表される化合物を加水分解縮合させて得ることができる。
上記aとしては、1又は2が好ましく、1がより好ましい。
[B]溶媒は、[A]金属化合物を溶解又は分散することができるものであれば用いることができる。
メタノール、エタノール、n-プロパノール、iso-プロパノール、n-ブタノール、iso-ブタノール、sec-ブタノール、tert-ブタノール、n-ペンタノール、iso-アミルアルコール、2-メチルブタノール、sec-ペンタノール、tert-ペンタノール、n-ヘキサノール、2-メチルペンタノール、sec-ヘキサノール、2-エチルブタノール、sec-ヘプタノール、3-ヘプタノール、n-オクタノール、2-エチルヘキサノール、sec-オクタノール、n-ノニルアルコール、2,6-ジメチル-4-ヘプタノール、n-デカノール、sec-ウンデシルアルコール、トリメチルノニルアルコール、sec-テトラデシルアルコール、sec-ヘプタデシルアルコール等の1価の脂肪族アルコール;
シクロヘキサノール、メチルシクロヘキサノール、3,3,5-トリメチルシクロヘキサノール等の1価の脂環式アルコール;
ベンジルアルコール、フェネチルアルコール等の芳香族アルコール;
3-メトキシブタノール、フルフリルアルコール、ジアセトンアルコール等の1価のエーテル基又はケト基含有アルコール;
エチレングリコール、1,2-プロピレングリコール、1,3-ブチレングリコール、2,4-ペンタンジオール、2-メチル-2,4-ペンタンジオール、2,5-ヘキサンジオール、2,4-ヘプタンジオール、2-エチル-1,3-ヘキサンジオール、ジエチレングリコール、ジプロピレングリコール、トリエチレングリコール、トリプロピレングリコール等の多価アルコール;
エチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル、エチレングリコールモノプロピルエーテル、エチレングリコールモノブチルエーテル、エチレングリコールモノヘキシルエーテル、エチレングリコールモノフェニルエーテル、エチレングリコールモノ-2-エチルブチルエーテル、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、プロピレングリコールモノプロピルエーテル、プロピレングリコールモノブチルエーテル等のアルキレングリコールモノアルキルエーテル;
ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノエチルエーテル、ジエチレングリコールモノプロピルエーテル、ジエチレングリコールモノブチルエーテル、ジエチレングリコールモノヘキシルエーテル、ジプロピレングリコールモノメチルエーテル、ジプロピレングリコールモノエチルエーテル、ジプロピレングリコールモノプロピルエーテル等のエーテル基含有アルキレングリコールモノアルキルエーテルなどが挙げられる。
アセトン、メチルエチルケトン、メチルn-プロピルケトン、メチルn-ブチルケトン、ジエチルケトン、メチルiso-ブチルケトン、メチルn-ペンチルケトン、エチルn-ブチルケトン、メチルn-ヘキシルケトン、ジiso-ブチルケトン、トリメチルノナノン等の鎖状ケトン;
シクロペンタノン、シクロヘキサノン、シクロヘプタノン、シクロオクタノン、メチルシクロヘキサノン等の環状ケトン;
アセトフェノン、フェニルエチルケトン等の芳香族ケトン;
アセトニルアセトン等のγ-ジケトンなどが挙げられる。
N-メチルホルムアミド、N,N-ジメチルホルムアミド、N,N-ジエチルホルムアミド、アセトアミド、N-メチルアセトアミド、N,N-ジメチルアセトアミド、N-メチルプロピオンアミド等の鎖状アミド;
N-メチルピロリドン、N,N’-ジメチルイミダゾリジノン等の環状アミドなどが挙げられる。
ジエチルエーテル、ジプロピルエーテル等のジ脂肪族エーテル;
アニソール、フェニルエチルエーテル等の芳香族-脂肪族エーテル;
ジフェニルエーテル等のジ芳香族エーテル;
テトラヒドロフラン、テトラヒドロピラン、ジオキサン等の環状エーテルなどが挙げられる。
酢酸メチル、酢酸エチル、酢酸n-プロピル、酢酸iso-プロピル、酢酸n-ブチル、酢酸iso-ブチル、酢酸sec-ブチル、酢酸n-ペンチル、酢酸sec-ペンチル、酢酸3-メトキシブチル、酢酸メチルペンチル、酢酸2-エチルブチル、酢酸2-エチルヘキシル、酢酸ベンジル、酢酸シクロヘキシル、酢酸メチルシクロヘキシル、酢酸n-ノニル、プロピオン酸エチル、プロピオン酸n-ブチル、プロピオン酸iso-アミル、アセト酢酸メチル、アセト酢酸エチル等のモノカルボン酸エステル;
シュウ酸ジエチル、シュウ酸ジ-n-ブチル、マロン酸ジエチル、フタル酸ジメチル、フタル酸ジエチル等のジカルボン酸エステル;
酢酸エチレングリコールモノメチルエーテル、酢酸エチレングリコールモノエチルエーテル、酢酸エチレングリコールモノプロピルエーテル、酢酸プロピレングリコールモノメチルエーテル、酢酸プロピレングリコールモノエチルエーテル、酢酸プロピレングリコールモノプロピルエーテル、酢酸プロピレングリコールモノブチルエーテル、プロピオン酸プロピレングリコールモノメチルエーテル等のアルキレングリコールモノアルキルエーテルカルボキシレート;
酢酸ジエチレングリコールモノメチルエーテル、酢酸ジエチレングリコールモノエチルエーテル、酢酸ジエチレングリコールモノ-n-ブチルエーテル、酢酸ジプロピレングリコールモノメチルエーテル、酢酸ジプロピレングリコールモノエチルエーテル、プロピオン酸ジエチレングリコールモノメチルエーテル等のエーテル基含有アルキレングリコールモノアルキルエーテルカルボキシレート;
グリコール酸メチル、グリコール酸エチル、乳酸メチル、乳酸エチル、乳酸n-ブチル、乳酸n-アミル等のヒドロキシ酸エステル;
γ-ブチロラクトン、γ-バレロラクトン等のラクトン;
ジエチルカーボネート、プロピレンカーボネート等のカーボネートなどが挙げられる。
当該無機膜形成組成物は[C]架橋促進剤をさらに含有していてもよい。[C]架橋促進剤は、光又は熱によって酸又は塩基を発生する化合物であり、当該無機膜形成組成物は、[C]架橋促進剤をさらに含有することで、レジストパターン形成性及びエッチング選択性を向上させることができる。[C]架橋促進剤としては、例えば、オニウム塩化合物、N-スルホニルオキシイミド化合物等が挙げられる。[C]架橋促進剤としては、熱によって酸又は塩基を発生する熱架橋促進剤が好ましく、その中でもオニウム塩化合物が好ましい。
当該無機膜形成組成物は、本発明の効果を損なわない範囲において、界面活性剤等のその他の任意成分を含有していてもよい。
界面活性剤は塗布性、ストリエーション等を改良する作用を示す成分である。界面活性剤としては、例えばポリオキシエチレンラウリルエーテル、ポリオキシエチレンステアリルエーテル、ポリオキシエチレンオレイルエーテル、ポリオキシエチレンn-オクチルフェニルエーテル、ポリオキシエチレンn-ノニルフェニルエーテル、ポリエチレングリコールジラウレート、ポリエチレングリコールジステアレート等のノニオン系界面活性剤の他、以下商品名として、KP341(信越化学工業社)、ポリフローNo.75、同No.95(以上、共栄社化学社)、エフトップEF301、同EF303、同EF352(以上、トーケムプロダクツ社)、メガファックF171、同F173(以上、大日本インキ化学工業社)、フロラードFC430、同FC431(以上、住友スリーエム社)、アサヒガードAG710、サーフロンS-382、同SC-101、同SC-102、同SC-103、同SC-104、同SC-105、同SC-106(以上、旭硝子社)等が挙げられる。
当該無機膜形成組成物は、例えば、[A]金属化合物及び[B]溶媒、並びに必要に応じて[C]架橋促進剤及びその他の任意成分等を所定の割合で混合することにより調製できる。上述したように、[B]溶媒として、[A]金属化合物の合成に用いた溶媒をそのまま用い、無機膜形成組成物を調製してもよい。当該無機膜形成組成物は通常、その使用に際して溶媒に溶解した後、例えば孔径0.2μm程度のフィルターでろ過することによって調製される。
当該パターン形成方法は、
基板の上面側に無機膜を形成する工程(以下、「無機膜形成工程」ともいう)、
上記無機膜の上面側にレジストパターンを形成する工程(以下、「レジストパターン形成工程」ともいう)、及び
上記レジストパターンをマスクとした1又は複数回のドライエッチングにより上記基板にパターンを形成する工程(以下、「基板パターン形成工程」ともいう)
を備え、
上記無機膜を、当該多層レジストプロセス用無機膜形成組成物により形成する。
上記レジストパターン形成工程が、
上記無機膜上に反射防止膜を積層する工程、及び
上記積層された反射防止膜上にレジストパターンを形成する工程
を含んでもいてもよい。
基板上にレジスト下層膜を形成する工程(以下、「レジスト下層膜形成工程」ともいう)
をさらに備え、
上記無機膜形成工程で無機膜を上記レジスト下層膜上に形成することも好ましい。
本工程では、当該無機膜形成組成物で、基板上の上面側に無機膜を形成する。上記基板としては、例えば酸化シリコン、窒化シリコン、酸窒化シリコン、ポリシロキサン等の絶縁膜、並びに市販品であるブラックダイヤモンド(AMAT社)、シルク(ダウケミカル社)、LKD5109(JSR社)等の低誘電体絶縁膜で被覆したウェハ等の層間絶縁膜が挙げられる。また、この基板としては、配線講(トレンチ)、プラグ溝(ビア)等のパターン化された基板を用いてもよい。上記無機膜は、当該無機膜形成組成物を基板の表面に塗布することにより塗膜を形成し、この塗膜を加熱処理、又は紫外光の照射及び加熱処理を行うことにより硬化、焼成等させることで形成できる。当該無機膜形成組成物を塗布する方法としては、例えばスピンコート法、ロールコート法、ディップ法等が挙げられる。また、上記加熱処理の温度としては、通常150℃~500℃であり、好ましくは180℃~350℃である。上記加熱処理の時間としては、通常30秒~1,200秒であり、好ましくは45秒~600秒である。上記紫外光の照射の条件は、当該無機膜形成組成物の組成等に応じて適宜選択される。形成される無機膜の膜厚としては、通常5nm~50nm程度である。
また、上記無機膜形成工程の前に、レジスト下層膜形成組成物を用い、基板上に有機膜であるレジスト下層膜を形成する工程を有していてもよい。レジスト下層膜形成組成物としては、従来公知のものを使用できるが、例えばNFC HM8005(JSR社)等が挙げられ。上記レジスト下層膜は、基板上にレジスト下層膜形成組成物を塗布することにより塗膜を形成し、この塗膜を加熱処理、又は紫外光の照射及び加熱処理を行うことにより硬化、乾燥等させることで形成できる。レジスト下層膜形成組成物を塗布する方法としては、例えばスピンコート法、ロールコート法、ディップ法等が挙げられる。また、上記加熱処理の温度としては、通常150℃~500℃であり、好ましくは180℃~350℃である。上記加熱処理の時間としては、通常30秒~1,200秒であり、好ましくは45秒~600秒である。上記紫外光の照射の条件は、レジスト下層膜形成組成物の組成等に応じて適宜選択される。形成されるレジスト下層膜の膜厚としては、通常50nm~500nm程度である。
本工程では、上記形成した無機膜の上面側にレジストパターンを形成する。このレジストパターンを形成する方法としては、例えば(A)レジスト組成物を用いる方法、(B)ナノインプリントリソグラフィー法により行う方法等が挙げられる。以下、それぞれについて説明する。
本方法を用いる場合、レジストパターン形成工程は、
レジスト組成物で上記無機膜の上面側にレジスト膜を形成する工程(以下、「レジスト膜形成工程」ともいう)、
上記レジスト膜を露光する工程(以下、「露光工程」ともいう)、及び
上記露光されたレジスト膜を現像する工程(以下、「現像工程」ともいう)
を含む。
以下、各工程について説明する。
本工程では、レジスト組成物で上記無機膜の上面側にレジスト膜を形成する。上記レジスト組成物としては、例えば酸解離性基を有する重合体と感放射線性酸発生剤とを含有するレジスト組成物、アルカリ可溶性樹脂とキノンジアジド系感光剤とを含有するポジ型レジスト組成物、アルカリ可溶性樹脂と架橋剤とを含有するネガ型レジスト組成物等が挙げられる。このようなレジスト組成物として、市販品のレジスト組成物を使用することもできる。レジスト組成物の塗布方法としては、例えばスピンコート法等の従来の方法によって塗布することができる。なお、レジスト組成物を塗布する際には、得られるレジスト膜が所望の膜厚となるように、塗布するレジスト組成物の量を調整する。上記レジスト膜の形成は、上記無機膜上に反射防止膜を積層し、この積層された反射防止膜上に行ってもよい。このようにレジスト組成物を用いてレジストパターンを形成する際に、反射防止膜を形成して行うと、得られるレジストパターンの形成性をより向上させることができる。
本工程では、上記形成されたレジスト膜を露光する。この露光は、通常フォトマスクを介してレジスト膜に選択的に放射線を照射することにより行う。露光に用いる放射線としては、レジスト組成物に使用されている酸発生剤の種類に応じて、例えば、可視光線、紫外線、遠紫外線、X線、γ線等の電磁波;電子線、分子線、イオンビーム等の粒子線などから適切に選択されるが、遠紫外線が好ましく、KrFエキシマレーザー光(248nm)、ArFエキシマレーザー光(193nm)、F2エキシマレーザー光(波長157nm)、Kr2エキシマレーザー光(波長147nm)、ArKrエキシマレーザー光(波長134nm)、極紫外線(波長13nm等)がより好ましい。また、液浸露光法も採用することができる。この場合、レジスト膜上に液浸上層膜形成組成物を用いて液浸上層膜を形成してもよい。
本工程では、上記露光されたレジスト膜を現像する。現像に用いる現像液としては、使用されるレジスト組成物の種類に応じて適宜選択することができる。上記酸解離性基を有する重合体と感放射線性酸発生剤とを含有するレジスト組成物やアルカリ可溶性樹脂を含有するポジ型レジスト組成物の場合には、例えば水酸化ナトリウム、水酸化カリウム、炭酸ナトリウム、珪酸ナトリウム、メタ珪酸ナトリウム、アンモニア、エチルアミン、n-プロピルアミン、ジエチルアミン、ジ-n-プロピルアミン、トリエチルアミン、メチルジエチルアミン、ジメチルエタノールアミン、トリエタノールアミン、テトラメチルアンモニウムハイドロオキサイド(TMAH)、テトラエチルアンモニウムヒドロキシド、ピロール、ピペリジン、コリン、1,8-ジアザビシクロ[5.4.0]-7-ウンデセン、1,5-ジアザビシクロ[4.3.0]-5-ノネン等のアルカリ性水溶液が挙げられ、ポジ型のレジストパターンを形成することができる。これらの中で、TMAH水溶液が好ましい。これらのアルカリ性水溶液は、水溶性有機溶媒、例えば、メタノール、エタノール等のアルコール類や、界面活性剤を適量添加したものであってもよい。
本方法を用いる場合、レジストパターン形成方法は、
ナノインプリントリソグラフィー法により、レジスト組成物を用い、上記無機膜上にレジストパターンを形成する工程(以下、「ナノインプリントリソグラフィー法によるレジストパターン形成工程」ともいう)
を含む。
以下、この工程について説明する。
本工程では、ナノインプリントリソグラフィー法により、レジスト組成物を用い、上記無機膜上にレジストパターンを形成する。本工程を詳述すると、上記無機膜上にパターン形成層を形成する工程(以下、「パターン形成層形成工程」ともいう)と、表面に反転パターンを有するモールドの表面を疎水化処理する工程(以下、「疎水化処理工程」ともいう)と、疎水化処理した上記モールドの表面をパターン形成層に圧接する工程(以下、「圧接工程」ともいう)と、上記モールドを圧接した状態でパターン形成層を露光する工程(以下、「露光工程」ともいう)と、上記モールドを、露光されたパターン形成層から剥離する工程(以下、「剥離工程」ともいう)とを含む方法である。
以下、各工程について説明する。
本工程では、上記無機膜上にパターン形成層を形成する。パターン形成層を構成する成分は、ナノインプリント用感放射線性組成物である。パターン形成層には、ナノインプリント用感放射線性組成物以外にも、硬化促進剤等を含有できる。硬化促進剤としては、例えば感放射線性硬化促進剤や熱硬化促進剤がある。これらの中でも、感放射線性硬化促進剤が好ましい。感放射線性硬化促進剤は、ナノインプリント用感放射線性組成物を構成する構成単位によって適宜選択でき、例えば光酸発生剤、光塩基発生剤及び光増感剤等が挙げられる。なお、感放射線性硬化促進剤は、単独で用いてもよく、2種以上を併用してもよい。
本工程では、表面に反転パターンを有するモールドの表面を疎水化処理する。上記モールドは、光透過性の材料で構成される必要がある。この光透過性の材料としては、例えばガラス、石英、PMMA、ポリカーボネート樹脂等の光透明性樹脂;透明金属蒸着膜;ポリジメチルシロキサン等の柔軟膜;光硬化膜;金属膜等が挙げられる。
本工程では、疎水化処理した上記モールドの表面をパターン形成層に圧接する。パターン形成層に凹凸パターンを有するモールドを圧接することでパターン形成層中に、モールド凹凸パターンが形成される。モールドを圧接する際の圧力としては、通常0.1MPa~100MPaであり、0.1MPa~50MPaが好ましく、0.1MPa~30MPaであることがより好ましく。圧接時間としては、通常1秒~600秒であり、1秒~300秒が好ましく、1秒~180秒がより好ましい。
本工程では、上記モールドを圧接した状態でパターン形成層を露光する。パターン形成層を露光することにより、ナノインプリント用感放射線性組成物に含有される光重合開始剤からラジカルが発生する。それにより、ナノインプリント用感放射線性組成物からなるパターン形成層が、モールドの凹凸パターンが転写された状態で硬化する。凹凸パターンが転写されることで、例えばLSI、システムLSI、DRAM、SDRAM、RDRAM、D-RDRAM等の半導体素子の層間絶縁膜用膜、半導体素子製造時におけるレジスト膜等として利用することができる。
本工程では、上記モールドを、露光されたパターン形成層から剥離する。剥離方法としては、特に限定されず例えば基材を固定してモールドを基材から遠ざかるように移動させて剥離してもよく、モールドを固定して基材をモールドから遠ざかるように移動させて剥離してもよく、これらの両方を逆方向へ引っ張って剥離してもよい。
本工程では、上記レジストパターンをマスクとした1又は複数回のドライエッチングにより、基板にパターンを形成する。なお、上記レジスト下層膜を形成している場合は、上記レジストパターンをマスクとして無機膜、レジスト下層膜及び被加工基板を順次ドライエッチングしてパターンを形成する。ドライエッチングは、公知のドライエッチング装置を用いて行うことができる。また、ドライエッチング時のソースガスとしては、被エッチング物の元素組成にもよるが、O2、CO、CO2等の酸素原子を含むガス、He、N2、Ar等の不活性ガス、Cl2、BCl3等の塩素系ガス、CHF3、CF4等のフッ素系ガス、H2、NH3のガス等を使用することができる。なお、これらのガスは混合して用いることもできる。
金属化合物の絶対分子量は、静的光散乱測定法により以下の装置及び条件により求めた。
装置:光散乱測定装置(ドイツALV社の「ALV-5000」)
条件:濃度2.5質量%、5.0質量%、7.5質量%、10.0質量%の各溶液を調製し、ろ過液を石英セルに充填してから上記装置にて測定を行った。
標準液体:トルエン
測定温度:23℃
なお、絶対分子量の算出に必要な下記パラメータは以下の装置を用いて測定した。
溶液の屈折率:屈折計(京都電子工業社の「RA-500」)
溶液の密度:密度比重計(京都電子工業社の「DA-100」)
秤量したアルミ皿(A[g])に、固形分濃度を測定する溶液1.00gを入れ、アルミ皿を150℃のホットプレートを用いて1時間大気下で加熱した後、室温まで冷却し、再度秤量(B[g])し、求めた各質量A及びBの値から、固形分濃度(質量%)=(B-A)×100の関係式により固形分濃度を算出した。
[A]金属化合物の合成に用いた化合物を以下に示す。
M-1:チタン(IV)ジイソプロポキシビス(2,4-ペンタンジオナート)(75質量%濃度の2-プロパノール溶液)
M-2:チタン(IV)ジイソプロポキシビス(エチルアセトアセテート)
M-3:ジルコニウム(IV)・ジn-ブトキシド・ビス(2,4-ペンタンジオナート)(60質量%濃度のブタノール溶液)
M-4:タンタル(V)テトラエトキシ(2,4-ペンタンジオナート)
M-5:ビス(シクロペンタジエニル)タングステン(IV)ジクロリド
上記化合物(M-1)50.9g(金属化合物の質量:38.2g、0.105mol)をプロピレングリコールモノエチルエーテル178.9gに溶解し、よく撹拌してからこの溶液に室温で水20.2g(1.12mol)を10分かけて滴下した。次いで、60℃で2時間反応を行った後に室温で冷却し、さらにプロピレングリコールモノエチルエーテル250gを加えた後、ロータリーエバポレーターによる減圧濃縮を実施し、低沸点成分を除去した溶液を得た。この溶液の固形分濃度は11.0質量%であった。また、この溶液に含まれる[A]金属化合物の静的光散乱測定法による絶対分子量は24,500であった。この溶液をプロピレングリコールモノエチルエーテルで希釈して固形分濃度が3質量%である[A]金属化合物の溶液(S-1)を調製した。
上記化合物(M-1)40.00g(金属化合物の質量:30.0g、0.082mol)及びプロピレングリコールモノメチルエーテル54.1gを混合し、室温でよく攪拌した後、水5.94g(0.33mol)を混合し、60℃まで昇温し4時間加熱撹拌を行った。反応終了後、室温まで冷却し、プロピレングリコールモノメチルエーテルを50.0g添加し、ロータリーエバポレーターによる減圧濃縮を実施し、低沸点成分を除去した溶液を得た。この溶液の固形分濃度は11.0質量%であった。また、この溶液に含まれる金属化合物の静的光散乱測定法による絶対分子量は6,000であった。この溶液をプロピレングリコールモノメチルエーテルで希釈して固形分濃度が3質量%である金属化合物の溶液(CS-1)を調製した。
上記化合物(M-2)7.6g(0.018mol)を2-プロパノール40.2gに溶解し、よく撹拌してからこの溶液に室温で水0.54g(0.030mol)と無水マレイン酸0.17g(1.7mmol)の混合液を10分かけて滴下した。次いで60℃で4時間反応を行った後に室温で冷却し、さらに酢酸プロピレングリコールモノメチルエーテル50gを加えた後、ロータリーエバポレーターによる減圧濃縮を実施し、低沸点成分を除去した溶液を得た。この溶液の固形分濃度は10.5質量%であった。また、この溶液に含まれる[A]金属化合物の静的光散乱測定法による絶対分子量は8,600であった。この溶液を酢酸プロピレングリコールモノメチルエーテルで希釈して固形分濃度が3質量%である[A]金属化合物の溶液(S-2)を調製した。
上記化合物(M-2)7.6g(0.018mol)を2-プロパノール40.2gに溶解し、よく撹拌してからこの溶液に室温で水1.08g(0.060モル)と無水マレイン酸0.17g(1.7mmol)との混合液を10分かけて滴下した。次いで60℃で4時間反応を行った後に室温で冷却し、さらに酢酸プロピレングリコールモノメチルエーテル50gを加えた後、ロータリーエバポレーターによる減圧濃縮を実施し、低沸点成分を除去した溶液を得た。この溶液の固形分濃度は10.8質量%であった。また、この溶液に含まれる金属化合物の静的光散乱測定法による絶対分子量は86,700であった。この溶液を酢酸プロピレングリコールモノメチルエーテルで希釈して固形分濃度が3質量%である金属化合物の溶液(CS-2)を調製した。
上記化合物(M-3)16.7g(金属化合物の質量:10.0g、0.023mol)を1-ブタノール99.6gに溶解し、よく撹拌してからこの溶液に室温で水2.5g(0.14mol)を10分かけて滴下した。次いで70℃で3時間反応を行った後に室温で冷却し、さらに1-ブタノール100gを加えた後、ロータリーエバポレーターによる減圧濃縮を実施し、低沸点成分を除去した溶液を得た。この溶液の固形分濃度は11.3質量%であった。また、この溶液に含まれる[A]金属化合物の静的光散乱測定法による絶対分子量は45,000であった。この溶液を1-ブタノールで希釈して固形分濃度が3質量%である[A]金属化合物の溶液(S-3)を調製した。
上記化合物(M-3)16.7g(金属化合物の質量:10.0g、0.023mol)をプロピレングリコールモノプロピルエーテル99.6gに溶解した。次に、この溶液に水0.41g(0.023mol)を加え、室温で24時間攪拌した。得られた溶液のうち11.7g(0.0023molのZrを含む)を取り出し、これと2-シアノ-3-(4-ヒドロキシフェニル)-アクリル酸エチル(CHAE)0.25g(1.15mmol)とを混合し、1時間室温で撹拌させて溶液を得た。この溶液の固形分濃度は8.0質量%であった。また、この溶液に含まれる金属化合物の静的光散乱測定法による絶対分子量は2,500であった。この溶液をプロピレングリコールモノプロピルエーテルで希釈して、固形分濃度が3質量%である金属化合物の溶液(CS-3)を調製した。
上記化合物(M-4)4.6g(0.010mol)をエタノール44.32gに溶解し、よく撹拌してからこの溶液に室温で水1.08g(0.060mol)を10分かけて滴下した。次いで60℃で1時間反応を行った後に室温で冷却し、さらにγ-ブチロラクトン50gを加えた後、ロータリーエバポレーターによる減圧濃縮を実施し、低沸点成分を除去した溶液を得た。この溶液の固形分濃度は11.0質量%であった。また、この溶液に含まれる[A]金属化合物の静的光散乱測定法による絶対分子量は29,000であった。この溶液をγ-ブチロラクトンで希釈して固形分濃度が3質量%である[A]金属化合物の溶液(S-4)を調製した。
上記化合物(M-5)3.8g(0.010mol)を乳酸エチル44.42gに溶解し、よく撹拌してからこの溶液に室温で水1.8g(0.10mol)を10分かけて滴下した。次いで60℃で2時間反応を行った後に室温で冷却し、さらに乳酸エチル50gを加えた後、ロータリーエバポレーターによる減圧濃縮を実施し、低沸点成分を除去した溶液を得た。この溶液の固形分濃度は11.0質量%であった。また、この溶液に含まれる[A]金属化合物の静的光散乱測定法による絶対分子量は13,000であった。この溶液を乳酸エチルで希釈して固形分濃度が3質量%である[A]金属化合物の溶液(S-5)を調製した。
無機膜形成組成物の調製に用いた[C]架橋促進剤を以下に示す。
[[C]架橋促進剤]
C-1:ジフェニルヨードニウムトリフルオロメタンスルホネート
C-2:酢酸テトラメチルアンモニウム
上記得られた金属化合物(S-1)の溶液100.0質量部を孔径0.2μmのフィルターでろ過して、多層レジストプロセス用無機膜形成組成物(J-1)を調製した。
下記表1に示す種類の金属化合物の溶液100.0質量部を用い、必要に応じて、表1に示す種類及び量の[C]架橋促進剤を用いた以外は実施例1と同様に操作して、多層レジストプロセス用無機膜形成組成物(J-2)~(J-5)及び(CJ-1)~(CJ-3)を調製した。なお、「-」は該当する成分を使用しなかったことを示す。
上記調製した多層レジストプロセス用無機膜形成組成物について、下記方法に従い、評価を行った。評価結果を表1にあわせて示す。
基板としてのシリコンウェハ上に、多層レジストプロセス用無機膜形成組成物を滴下した後、1,000rpmで30秒間基板を回転させ、塗膜(未加熱膜)を形成した。この塗膜(塗布回転乾燥後の無機膜)の一部を、基板の端部及び裏面を洗浄する洗浄溶剤としてのγ-ブチロラクトンに1分間浸漬した後、エアーガンで乾燥させた。その際の未加熱膜の除去度合いにより、以下の指標で洗浄溶剤除去性を評価した。
A(良好):目視で膜が完全に除去されたことを確認した
B(不良):目視で膜が一部除去されていないことを確認した
基板としての8インチシリコンウェハ上に、多層レジストプロセス用無機膜形成組成物をスピンコーターによって塗布し、塗膜を形成した。この基板の塗膜の真上に、ブランクの8インチシリコンウエハを0.75mmのスペーサーを介して表面が塗布膜側になるように置いた。次いで、ブランクウエハと対になった塗布基板を250℃で5分間加熱し、塗膜中から揮発する成分をブランクウエハで捕捉した。次に、捕捉に用いたブランクウエハの中心部を1cm角にカットし、カット部の表面を12.5質量%のフッ化水素酸水溶液0.1mLを用いてエッチングし、得られた液を超純水で10倍に希釈し、この希釈液が含有する金属量を、ICP-MS測定装置(アジレント・テクノロジー社の「Agilent 7500s」)で測定することにより、ベーク時に揮発する無機膜成分を定量した。これら一連の操作を3回繰り返し行った。また、参照試験として、上記捕捉操作を行わない新品のブランクウエハについても、上記同様の操作を3回繰り返し行った。捕捉に用いたブランクウエハのエッチング後の回収液に含まれる無機膜成分の分析3回の平均値(S)と、参照試験のエッチング後の回収液に含まれる無機膜成分の分析3回の平均値(R)との関係が、S/R<1.1である場合は揮発抑制性は「A(良好)」と、S/R≧1.1である場合は揮発抑制性は「B(不良)」と評価した。
(レジスト組成物-アルカリ水溶液現像の場合)
基板としてのシリコンウェハ上に、レジスト下層膜形成組成物(JSR社の「NFC HM8005」)をスピンコーターによって塗布し、250℃のホットプレート上で60秒間乾燥させることにより、膜厚300nmのレジスト下層膜を形成した。形成したレジスト下層膜上に多層レジストプロセス用無機膜形成組成物をスピンコーターによって塗布し、250℃のホットプレート上で60秒間焼成することにより膜厚20nmの無機膜を形成した。形成した無機膜上にレジスト組成物(JSR社の「ARX2014J」)を塗布し、90℃で60秒間乾燥させ膜厚100nmのレジスト膜を形成した。形成したレジスト膜上に液浸上層膜形成組成物(JSR社の「NFC TCX091-7」)を塗布し、90℃で60秒間乾燥させ膜厚30nmの液浸上層膜を形成した。次に、形成されるラインとスペースの幅が共に50nmであるラインアンドスペースパターン形成用のフォトマスクを介して、ArFエキシマレーザー照射装置(ニコン社の「S610C」)を用い、液浸露光法によって16mJ/cm2の露光量で露光した後、レジスト膜を含む基板を115℃で60秒間加熱した。次いで、2.38質量%テトラメチルアンモニウムハイドロオキサイド水溶液を現像液として用い30秒間現像し、50nmの1L/1Sレジストパターンを形成した。形成したレジストパターンを走査型電子顕微鏡(日立ハイテクノロジーズ社)で観察し、50nmのラインアンドスペースのパターンにおいて、レジストパターンのボトム形状が裾広がり形状になっていない場合は、レジストパターン形成性は「A(良好)」と、裾広がり形状になっている場合は、「B(不良)」と評価した。形成したレジストパターンをマスクとして無機膜及び基板に対し、ドライエッチンッグ装置(東京エレクトロン社の「Telius SCCM」)を用いて順次ドライエッチングすることでパターン転写を行った。
基板としてのシリコンウェハ上に、レジスト下層膜形成組成物(JSR社の「NFC HM8005」)をスピンコーターによって塗布し、250℃のホットプレート上で60秒間乾燥させることにより、膜厚300nmのレジスト下層膜を形成した。形成したレジスト下層膜上に多層レジストプロセス用無機膜形成組成物をスピンコーターによって塗布し、250℃のホットプレート上で60秒間焼成することにより膜厚20nmの無機膜を形成した。形成した無機膜上にレジスト組成物(JSR社の「ARX2014J」)を塗布し、90℃で60秒間乾燥させ膜厚100nmのレジスト膜を形成した。形成したレジスト膜上に液浸上層膜形成組成物(JSR社の「NFC TCX091-7」)を塗布し、90℃で60秒間乾燥させ膜厚30nmの液浸上層膜を形成した。次に、形成されるラインとスペースの幅が共に40nmであるラインアンドスペースパターン形成用のフォトマスクを介して、ArFエキシマレーザー照射装置(ニコン社の「S610C」)を用い、液浸露光法によって16mJ/cm2の露光量で露光した後、レジスト膜を含む基板を115℃で60秒間加熱した。次いで、酢酸ブチルを現像液として30秒間パドル現像し、メチルイソブチルカービノール(MIBC)でリンスした。2,000rpm、15秒間振り切りでスピンドライすることにより、40nmの1L/1Sレジストパターンを形成した。形成したレジストパターンを走査型電子顕微鏡(日立ハイテクノロジーズ社)で観察し、40nmのラインアンドスペースのパターンにおいて、レジストパターンのボトム形状が裾広がり形状にならない場合は、レジストパターン形成性は「A(良好)」と、裾広がり形状になる場合は「B(不良)」と評価した。形成したレジストパターンをマスクとして無機膜及び基板に対し、ドライエッチング装置(東京エレクトロン社の「Telius SCCM」)を用いて順次ドライエッチングすることでパターン転写を行った。
上記エッチング装置を用いて、上記無機膜を以下の2通りの方法でエッチングし、エッチング選択性を評価した。
(1)上記レジスト下層膜(NFC HM8005)を毎分200nmの速度でエッチングする条件
(2)二酸化シリコン膜を毎分100nmの速度でエッチングする条件
これらの各エッチング条件において、無機膜における初期膜厚とエッチング後の膜厚の差が5nm未満の場合は、エッチング選択性は「A(良好)」と、差が5nm以上の場合は「B(不良)」と評価した。エッチング選択性が良好と評価された場合、無機膜形成組成物から形成される無機膜は、それぞれの膜を加工する際のマスク膜として良好に機能することができる。
一方、比較例の無機膜形成組成物について、比較例1及び比較例3では、揮発抑制性が不良であるが、これは金属化合物の絶対分子量が小さいことから、塗布回転乾燥後でも加熱により容易に揮発する成分が多く含まれているためと考えられる。比較例2では、金属化合物の絶対分子量が大きすぎることに起因して、塗布回転乾燥後の無機膜における洗浄溶剤除去性が不良となっていると考えられる。
Claims (12)
- チタン、タンタル、ジルコニウム及びタングステンからなる群より選ばれる少なくとも1種の複数の金属原子と、上記複数の金属原子間を架橋する酸素原子と、上記金属原子に配位する多座配位子とを含む金属化合物、及び
溶媒
を含有し、
静的光散乱法によって測定される上記金属化合物の絶対分子量が、8,000以上50,000以下である多層レジストプロセス用無機膜形成組成物。 - 上記金属化合物が、金属原子に2個の架橋酸素原子が結合している構造を主に含む請求項1に記載の多層レジストプロセス用無機膜形成組成物。
- 上記多座配位子が、ヒドロキシ酸エステル、β-ジケトン、β-ケトエステル、β-ジカルボン酸エステル及びπ結合を有する炭化水素からなる群より選ばれる少なくとも1種に由来する請求項1に記載の多層レジストプロセス用無機膜形成組成物。
- 上記金属原子が、チタン及びジルコニウムからなる群より選ばれる少なくとも1種である請求項1に記載の多層レジストプロセス用無機膜形成組成物。
- 上記溶媒が、炭素数4以上の脂肪族1価アルコール、炭素数4以上のアルキレングリコールモノアルキルエーテル、炭素数4以上のヒドロキシ酸エステル、炭素数4以上のラクトン及び炭素数6以上のアルキレングリコールモノアルキルエーテルカルボキシレートからなる群より選ばれる少なくとも1種を含む請求項1に記載の多層レジストプロセス用無機膜形成組成物。
- 上記式(1)におけるbが2である請求項6に記載の多層レジストプロセス用無機膜形成組成物。
- 上記式(1)におけるLの多座配位子が、ヒドロキシ酸エステル、β-ジケトン、β-ケトエステル、β-ジカルボン酸エステル及びπ結合を有する炭化水素からなる群より選ばれる少なくとも1種に由来する請求項6に記載の多層レジストプロセス用無機膜形成組成物。
- 上記式(1)におけるXが、アルコキシ配位子である請求項6に記載の多層レジストプロセス用無機膜形成組成物。
- 基板の上面側に無機膜を形成する工程、
上記無機膜の上面側にレジストパターンを形成する工程、及び
上記レジストパターンをマスクとした1又は複数回のドライエッチングにより上記基板にパターンを形成する工程
を備え、
上記無機膜を、請求項1に記載の多層レジストプロセス用無機膜形成組成物により形成するパターン形成方法。 - 上記レジストパターン形成工程が、
上記無機膜上に反射防止膜を積層する工程、及び
上記積層された反射防止膜上にレジストパターンを形成する工程
を含む請求項10に記載のパターン形成方法。 - 基板上にレジスト下層膜を形成する工程
をさらに備え、
上記無機膜形成工程で無機膜を上記レジスト下層膜上に形成する請求項10に記載のパターン形成方法。
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JP2022096615A (ja) * | 2020-12-17 | 2022-06-29 | ローム アンド ハース エレクトロニック マテリアルズ エルエルシー | フォトレジスト下層組成物及びパターン形成方法 |
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WO2019021975A1 (ja) * | 2017-07-24 | 2019-01-31 | Jsr株式会社 | 極端紫外線又は電子線リソグラフィー用金属含有膜形成組成物、極端紫外線又は電子線リソグラフィー用金属含有膜及びパターン形成方法 |
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