WO2018084050A1 - 金属含有オニウム塩化合物、光崩壊性塩基及びレジスト組成物、並びに、該レジスト組成物を用いたデバイスの製造方法 - Google Patents
金属含有オニウム塩化合物、光崩壊性塩基及びレジスト組成物、並びに、該レジスト組成物を用いたデバイスの製造方法 Download PDFInfo
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- WO2018084050A1 WO2018084050A1 PCT/JP2017/038522 JP2017038522W WO2018084050A1 WO 2018084050 A1 WO2018084050 A1 WO 2018084050A1 JP 2017038522 W JP2017038522 W JP 2017038522W WO 2018084050 A1 WO2018084050 A1 WO 2018084050A1
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- -1 salt compound Chemical class 0.000 title claims abstract description 105
- 239000000203 mixture Substances 0.000 title claims abstract description 68
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 48
- 239000002184 metal Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title description 7
- 230000008569 process Effects 0.000 title description 4
- 150000001875 compounds Chemical class 0.000 claims description 62
- 239000002253 acid Substances 0.000 claims description 60
- 150000001450 anions Chemical class 0.000 claims description 39
- 125000000217 alkyl group Chemical group 0.000 claims description 37
- 229910052718 tin Inorganic materials 0.000 claims description 33
- 125000004432 carbon atom Chemical group C* 0.000 claims description 24
- 125000003118 aryl group Chemical group 0.000 claims description 22
- 125000006239 protecting group Chemical group 0.000 claims description 15
- 125000005842 heteroatom Chemical group 0.000 claims description 14
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 11
- 125000000732 arylene group Chemical group 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 229910052717 sulfur Inorganic materials 0.000 claims description 10
- 125000004434 sulfur atom Chemical group 0.000 claims description 10
- 238000010894 electron beam technology Methods 0.000 claims description 9
- 238000004132 cross linking Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical group [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims description 7
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical group [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 claims description 7
- 229910052740 iodine Inorganic materials 0.000 claims description 7
- 150000003839 salts Chemical class 0.000 claims description 7
- 229910052711 selenium Inorganic materials 0.000 claims description 7
- 229910052714 tellurium Inorganic materials 0.000 claims description 7
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical group [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 claims description 7
- 239000003431 cross linking reagent Substances 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 5
- 229910052732 germanium Inorganic materials 0.000 claims description 4
- 229910052745 lead Inorganic materials 0.000 claims description 4
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 abstract description 21
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- 238000001459 lithography Methods 0.000 abstract description 8
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- 238000003786 synthesis reaction Methods 0.000 description 39
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 30
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- 239000002585 base Substances 0.000 description 28
- 239000000243 solution Substances 0.000 description 22
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 17
- 238000009792 diffusion process Methods 0.000 description 17
- 229910052731 fluorine Inorganic materials 0.000 description 17
- 125000001424 substituent group Chemical group 0.000 description 17
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- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 12
- 239000013078 crystal Substances 0.000 description 11
- 239000011737 fluorine Substances 0.000 description 11
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- 125000001153 fluoro group Chemical group F* 0.000 description 10
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- 238000010521 absorption reaction Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- MIOPJNTWMNEORI-GMSGAONNSA-N (S)-camphorsulfonic acid Chemical compound C1C[C@@]2(CS(O)(=O)=O)C(=O)C[C@@H]1C2(C)C MIOPJNTWMNEORI-GMSGAONNSA-N 0.000 description 7
- 150000001768 cations Chemical class 0.000 description 7
- 238000011161 development Methods 0.000 description 7
- VLLPVDKADBYKLM-UHFFFAOYSA-M 1,1,2,2,3,3,4,4,4-nonafluorobutane-1-sulfonate;triphenylsulfanium Chemical compound [O-]S(=O)(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F.C1=CC=CC=C1[S+](C=1C=CC=CC=1)C1=CC=CC=C1 VLLPVDKADBYKLM-UHFFFAOYSA-M 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 6
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 5
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- 125000005843 halogen group Chemical group 0.000 description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 5
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 5
- 238000000206 photolithography Methods 0.000 description 5
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- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 4
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- 101000648503 Homo sapiens Tumor necrosis factor receptor superfamily member 11A Proteins 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
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- 125000003342 alkenyl group Chemical group 0.000 description 4
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- QARVLSVVCXYDNA-UHFFFAOYSA-N bromobenzene Chemical compound BrC1=CC=CC=C1 QARVLSVVCXYDNA-UHFFFAOYSA-N 0.000 description 4
- 150000001721 carbon Chemical group 0.000 description 4
- IJOOHPMOJXWVHK-UHFFFAOYSA-N chlorotrimethylsilane Chemical compound C[Si](C)(C)Cl IJOOHPMOJXWVHK-UHFFFAOYSA-N 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 4
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 150000003462 sulfoxides Chemical class 0.000 description 4
- 239000004094 surface-active agent Substances 0.000 description 4
- 238000010626 work up procedure Methods 0.000 description 4
- NHQDETIJWKXCTC-UHFFFAOYSA-N 3-chloroperbenzoic acid Chemical compound OOC(=O)C1=CC=CC(Cl)=C1 NHQDETIJWKXCTC-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 101000644537 Homo sapiens Sequestosome-1 Proteins 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- 208000026678 Paget disease of bone 6 Diseases 0.000 description 3
- 102100020814 Sequestosome-1 Human genes 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 description 3
- 229920005601 base polymer Polymers 0.000 description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 150000001735 carboxylic acids Chemical class 0.000 description 3
- 125000001309 chloro group Chemical group Cl* 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 3
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 3
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 3
- 125000005027 hydroxyaryl group Chemical group 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 3
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- LULAYUGMBFYYEX-UHFFFAOYSA-N metachloroperbenzoic acid Natural products OC(=O)C1=CC=CC(Cl)=C1 LULAYUGMBFYYEX-UHFFFAOYSA-N 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
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- 125000004433 nitrogen atom Chemical group N* 0.000 description 3
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- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 3
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- BBFDUDCBMXFOCY-UHFFFAOYSA-M (4-bromophenyl)-phenyliodanium;trifluoromethanesulfonate Chemical compound [O-]S(=O)(=O)C(F)(F)F.C1=CC(Br)=CC=C1[I+]C1=CC=CC=C1 BBFDUDCBMXFOCY-UHFFFAOYSA-M 0.000 description 2
- SJJCQDRGABAVBB-UHFFFAOYSA-N 1-hydroxy-2-naphthoic acid Chemical compound C1=CC=CC2=C(O)C(C(=O)O)=CC=C21 SJJCQDRGABAVBB-UHFFFAOYSA-N 0.000 description 2
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 description 2
- IJICRIUYZZESMW-UHFFFAOYSA-N 2-bromodibenzothiophene Chemical compound C1=CC=C2C3=CC(Br)=CC=C3SC2=C1 IJICRIUYZZESMW-UHFFFAOYSA-N 0.000 description 2
- ALKYHXVLJMQRLQ-UHFFFAOYSA-N 3-Hydroxy-2-naphthoate Chemical compound C1=CC=C2C=C(O)C(C(=O)O)=CC2=C1 ALKYHXVLJMQRLQ-UHFFFAOYSA-N 0.000 description 2
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical group [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical group [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 2
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- AFVFQIVMOAPDHO-UHFFFAOYSA-M Methanesulfonate Chemical compound CS([O-])(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-M 0.000 description 2
- MZRVEZGGRBJDDB-UHFFFAOYSA-N N-Butyllithium Chemical compound [Li]CCCC MZRVEZGGRBJDDB-UHFFFAOYSA-N 0.000 description 2
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- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- ZMZDMBWJUHKJPS-UHFFFAOYSA-M Thiocyanate anion Chemical compound [S-]C#N ZMZDMBWJUHKJPS-UHFFFAOYSA-M 0.000 description 2
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- RDOXTESZEPMUJZ-UHFFFAOYSA-N anisole Chemical compound COC1=CC=CC=C1 RDOXTESZEPMUJZ-UHFFFAOYSA-N 0.000 description 2
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- 230000008859 change Effects 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- KWTSZCJMWHGPOS-UHFFFAOYSA-M chloro(trimethyl)stannane Chemical compound C[Sn](C)(C)Cl KWTSZCJMWHGPOS-UHFFFAOYSA-M 0.000 description 2
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- IYYZUPMFVPLQIF-UHFFFAOYSA-N dibenzothiophene Chemical compound C1=CC=C2C3=CC=CC=C3SC2=C1 IYYZUPMFVPLQIF-UHFFFAOYSA-N 0.000 description 2
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- LZCLXQDLBQLTDK-UHFFFAOYSA-N ethyl 2-hydroxypropanoate Chemical compound CCOC(=O)C(C)O LZCLXQDLBQLTDK-UHFFFAOYSA-N 0.000 description 2
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- 150000003951 lactams Chemical group 0.000 description 2
- 150000002596 lactones Chemical group 0.000 description 2
- UCDWWJKPBQZZNT-UHFFFAOYSA-N magnesium;oxolane Chemical compound [Mg].C1CCOC1 UCDWWJKPBQZZNT-UHFFFAOYSA-N 0.000 description 2
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- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 description 2
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 2
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- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
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- DSLBDAPZIGYINM-UHFFFAOYSA-N sulfanium;chloride Chemical compound S.Cl DSLBDAPZIGYINM-UHFFFAOYSA-N 0.000 description 2
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- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 description 2
- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical compound OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 description 2
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- HNAGHMKIPMKKBB-UHFFFAOYSA-N 1-benzylpyrrolidine-3-carboxamide Chemical compound C1C(C(=O)N)CCN1CC1=CC=CC=C1 HNAGHMKIPMKKBB-UHFFFAOYSA-N 0.000 description 1
- NHDODQWIKUYWMW-UHFFFAOYSA-N 1-bromo-4-chlorobenzene Chemical compound ClC1=CC=C(Br)C=C1 NHDODQWIKUYWMW-UHFFFAOYSA-N 0.000 description 1
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- IVZPNRXMSUKABT-UHFFFAOYSA-N 1-chloro-4-phenylselanylbenzene Chemical compound C1=CC(Cl)=CC=C1[Se]C1=CC=CC=C1 IVZPNRXMSUKABT-UHFFFAOYSA-N 0.000 description 1
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- BJYPUAVFYCRNFH-UHFFFAOYSA-N 2-(aminomethyl)-6-methoxyoxane-3,4,5-triol Chemical compound COC1OC(CN)C(O)C(O)C1O BJYPUAVFYCRNFH-UHFFFAOYSA-N 0.000 description 1
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- UOBYKYZJUGYBDK-UHFFFAOYSA-N 2-naphthoic acid Chemical compound C1=CC=CC2=CC(C(=O)O)=CC=C21 UOBYKYZJUGYBDK-UHFFFAOYSA-N 0.000 description 1
- MGADZUXDNSDTHW-UHFFFAOYSA-N 2H-pyran Chemical compound C1OC=CC=C1 MGADZUXDNSDTHW-UHFFFAOYSA-N 0.000 description 1
- BUQNPHOBMVKITJ-UHFFFAOYSA-N 3-chlorobenzenecarboperoxoic acid;dichloromethane Chemical compound ClCCl.OOC(=O)C1=CC=CC(Cl)=C1 BUQNPHOBMVKITJ-UHFFFAOYSA-N 0.000 description 1
- QGHDLJAZIIFENW-UHFFFAOYSA-N 4-[1,1,1,3,3,3-hexafluoro-2-(4-hydroxy-3-prop-2-enylphenyl)propan-2-yl]-2-prop-2-enylphenol Chemical group C1=C(CC=C)C(O)=CC=C1C(C(F)(F)F)(C(F)(F)F)C1=CC=C(O)C(CC=C)=C1 QGHDLJAZIIFENW-UHFFFAOYSA-N 0.000 description 1
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- G03F7/004—Photosensitive materials
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
- G03F7/0392—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition
- G03F7/0397—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition the macromolecular compound having an alicyclic moiety in a side chain
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/30—Imagewise removal using liquid means
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2602/00—Systems containing two condensed rings
- C07C2602/36—Systems containing two condensed rings the rings having more than two atoms in common
- C07C2602/42—Systems containing two condensed rings the rings having more than two atoms in common the bicyclo ring system containing seven carbon atoms
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2603/00—Systems containing at least three condensed rings
- C07C2603/56—Ring systems containing bridged rings
- C07C2603/58—Ring systems containing bridged rings containing three rings
- C07C2603/70—Ring systems containing bridged rings containing three rings containing only six-membered rings
- C07C2603/74—Adamantanes
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/38—Treatment before imagewise removal, e.g. prebaking
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/55—Design of synthesis routes, e.g. reducing the use of auxiliary or protecting groups
Definitions
- Some embodiments of the present invention relate to a metal-containing onium salt compound, and more particularly to a metal-containing onium salt compound suitably used in a resist composition for lithography using ionizing radiation such as extreme ultraviolet rays as an exposure source.
- some embodiments of the present invention relate to a photodisintegrating base and a resist composition containing the metal-containing onium salt compound, and a device manufacturing method using the resist composition.
- Lithography technology that uses ionizing radiation such as short-wavelength light, especially extreme ultraviolet (EUV), can be manufactured by single patterning, so it has high sensitivity to ionizing radiation such as extreme ultraviolet (EUV).
- EUV extreme ultraviolet
- the need for the resist composition shown is expected to increase further in the future.
- the resist composition is required to have improved lithography characteristics having sensitivity to the exposure light source and resolution capable of reproducing the formation of a fine dimensional pattern.
- a chemically amplified resist using an acid generator is known.
- the acid generated by exposure diffuses within the resist, greatly affecting the performance of lithography, and contrast and line pattern line edge roughness ( There is a problem that the (LER) characteristic is reduced.
- Patent Document 1 it has been proposed to increase the resolution by adding an acid diffusion control agent to the resist composition for the purpose of appropriately controlling the diffusion of the acid generated from the acid generator.
- Patent Document 2 proposes a photo-disintegrating base that is decomposed by exposure and loses acid diffusion controllability.
- the present inventors have included a specific onium salt compound as a photodisintegrating base in the resist composition, so that the absorption efficiency of ionizing radiation such as EUV is large, and the sensitivity and resolution.
- the present inventors have found that characteristics of pattern performance can be improved, and have completed some aspects of the present invention.
- one aspect of the present invention is a metal-containing onium salt compound represented by the following formula (1).
- R 1 and R 2 are each independently an alkyl group having 1 to 20 carbon atoms or an aryl group having 5 to 20 carbon atoms, and a hydrogen atom of the alkyl group and the aryl group. Part or all may be substituted.
- Ar 1 is an arylene group having 5 to 20 carbon atoms, and some or all of the hydrogen atoms of the arylene group may be substituted.
- the alkyl group may contain a heteroatom-containing group instead of at least one methylene group, and the aryl group and arylene group may contain a heteroatom instead of at least one carbon atom in the ring structure. good.
- M is any selected from the group consisting of Ge, Sn and Pb.
- Y is any one selected from the group consisting of an iodine atom, a sulfur atom, a selenium atom and a tellurium atom.
- n is 1, and Y is a sulfur atom, a selenium atom or a tellurium atom.
- N is 2 when either. Any two or more of Ar 1 and two R 2 may be bonded to each other to form a ring structure together with Y to which these are bonded, and the ring structure may contain a heteroatom.
- X ⁇ is an anion.
- Another embodiment of the present invention is a photodegradable base and a resist composition containing the metal-containing onium salt compound. Furthermore, another aspect of the present invention provides a step of forming a resist film on a substrate using the resist composition, a step of exposing the resist film, and developing the exposed resist film to obtain a resist pattern. And a device manufacturing method including the steps.
- the metal-containing onium salt compound according to one embodiment of the present invention contains a specific metal, thereby increasing film absorption against ionizing radiation such as extreme ultraviolet (EUV), and has high ionization efficiency and secondary electron generation efficiency. Therefore, sensitivity, resolution, and pattern performance are excellent.
- EUV extreme ultraviolet
- Metal-containing onium salt compound has the above structure.
- there is one —MR 3 group but some may be included as a substituent.
- the cation of the metal-containing onium salt compound represented by the above formula (1) represents a monocation, it may be a polycation, and the anion when it is a polycation corresponds to it.
- the metal-containing onium salt compound contains a specific metal
- film absorption against ionizing radiation such as EUV increases, ionization efficiency increases, and secondary electron generation efficiency increases. It is considered that the resist composition contained has high sensitivity. Since the above metal-containing onium salt compound contains a specific metal atom, the film absorption against ionizing radiation such as EUV is increased and the generation efficiency of secondary electrons is improved. Therefore, the decomposition efficiency of the metal-containing onium salt compound and the photoacid generator is improved. Can be improved.
- the metal-containing onium salt compound is a salt having a conjugate base weaker than that of the photoacid generator, in the unexposed area, the acid derived from the photoacid generator acid is lost by reacting with the acid generated from the photoacid generator. It can be activated and can act as an acid diffusion control agent.
- the metal-containing onium salt compound is a salt having a conjugate base equivalent to that of the photoacid generator, the specific metal present in the cation may deactivate the acid derived from the photoacid generator in the unexposed area. And can act as an acid diffusion control agent. Therefore, when the metal-containing onium salt compound according to one embodiment of the present invention is used in a resist composition, the resist composition can be excellent in sensitivity, resolution, and pattern forming ability.
- R 1 and R 2 are each independently an alkyl group having 1 to 20 carbon atoms or an aryl group having 5 to 20 carbon atoms, and part or all of the hydrogen atoms of the alkyl group and the aryl group May be substituted.
- alkyl group having 1 to 20 carbon atoms examples include straight chain such as methyl group, ethyl group, n-propyl group, n-butyl group, n-pentyl group, n-hexyl group, n-octyl and n-dodecyl group.
- Alkyl group branched chain alkyl group such as isopropyl group, isobutyl group, tert-butyl group, isopentyl group, tert-pentyl group, 2-ethyloctyl group and 2-ethyldecyl group; cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl Groups, cycloaliphatic alkyl groups such as cyclooctyl group and decahydronaphthyl group; and the like.
- spiro [3,4] octyl groups and spiro bicyclopentyl groups such as spirobicyclopentyl groups; norbornyl groups, tricyclodecanyl groups, tetracyclododecanyl groups and adamantyl groups
- Examples thereof include a bridged alicyclic alkyl group such as decalin and a condensed ring alicyclic alkyl group having a steroid skeleton as shown below;
- hetero atom-containing group examples include —O—, —CO—, —COO—, —OCO—, —O—CO—O—, —NHCO—, —CONH—, —NH—CO—O—, —O.
- alkyl group containing a divalent heteroatom-containing group examples include an alkoxy group; an alkylcarbonyloxy group; an alkyl group having a heterocyclic structure such as a lactone structure, a sultone structure, and a lactam structure; Additionally, carbon atoms in the alkyl group - at least one of the carbon single bonds, carbon - carbon double bond or carbon - alkenyl substituted carbon triple bond alkynyl group; a also R 1 and R 2 and was the like Can be mentioned.
- aryl group having 5 to 20 carbon atoms examples include monovalent aromatic hydrocarbon groups such as phenyl group, naphthyl group, anthracenyl group, phenanthrenyl group and azulenyl group. Moreover, it may be a monovalent aromatic heterocyclic group containing a hetero atom instead of the carbon atom in the ring of the aromatic hydrocarbon group.
- aromatic heterocyclic group examples include monovalent aromatic heterocyclic groups having a skeleton such as furan, thiophene, pyran, chromene, thianthrene, dibenzothiophene, and xanthene.
- R 1 and R 2 examples include a linear or alicyclic alkyl group (—R Sp ); a linear or alicyclic alkenyl group; the alkyl group and at least one methylene group in the alkenyl group Instead of —O—, —CO—, —COO—, —OCO—, —O—CO—O—, —NHCO—, —CONH—, —NH—CO—O—, —O—CO—NH—
- R Sp examples include linear, branched, or cyclic alkyl groups.
- Ar Sp include aromatic hydrocarbon groups having 12 or less carbon atoms such as a phenyl group and a naphthyl group, and aromatic heterocyclic groups that may contain a hetero atom in the ring structure instead of a carbon atom.
- R 1 and R 2 have a substituent, the total carbon number of each R 1 to R 2 including the substituent is preferably 1 to 20, more preferably 5 to 15, Particularly preferred is 6-10.
- Examples of the alkyl group (R Sp ), alkenyl group, and aryl group (Ar Sp ) as a substituent include the same alkyl groups, alkenyl groups, and aryl groups as those described above for R 1 to R 2 .
- Examples of the halogen atom as a substituent include a fluorine atom, a chlorine atom and a bromine atom.
- R 1 is preferably a methyl group, an n-butyl group, an aryl group, or the like.
- R 2 includes methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, t-butyl group, n-pentyl group, n-hexyl group, cyclopentyl group, cyclohexyl group, adamantyl group and aryl group. Etc. are preferred.
- Ar 1 is an arylene group having 5 to 20 carbon atoms, and examples thereof include those in which the aryl group as R 1 and R 2 is divalent. Examples of the substituent for the arylene group as Ar 1 include the same as the substituents for R 1 and R 2 . In addition, when Ar 1 has a substituent, the total carbon number of Ar 1 including the substituent is preferably 5 to 20, more preferably 5 to 16, and more preferably 5 to 13. Particularly preferred. Ar 1 is preferably a phenyl group or a naphthyl group.
- M is any selected from the group consisting of Ge, Sn and Pb. M is preferably Sn from the viewpoint of absorbance to EUV. When M is Sn, R 1 is preferably methyl, n-butyl, phenyl or the like for reasons of solubility. Each R 1 may be different, but it is preferable that the three R 1 bonded to M are the same from the viewpoint of synthesis. In addition, any two or more of R 1 may be bonded to each other to form a ring structure together with M to which these are bonded, and the ring structure may contain a hetero atom.
- Y is any selected from the group consisting of an iodine atom, a sulfur atom, a selenium atom and a tellurium atom.
- N is 1 when Y is an iodine atom, and n is 2 when Y is any one of a sulfur atom, a selenium atom, and a tellurium atom.
- Any two or more of Ar 1 and two R 2 may be bonded to each other to form a ring structure together with Y to which these are bonded, and the ring structure may contain a heteroatom. .
- Examples of such a cation when Y is any one of a sulfur atom, a selenium atom, and a tellurium atom include, but are not limited to, the following in the present invention.
- the metal-containing onium salt compound according to one embodiment of the present invention is preferably an onium salt compound represented by the following formula (2) or (3) in which Y is an iodine atom and a sulfur atom.
- R 1 in the formula (2) and (3), R 2, M , Ar 1 and X - is, R 1 in the formula (1), R 2, M , Ar 1 and wherein X - is the same as preferable.
- Specific examples of the structure of the iodonium cation of the onium salt compound represented by the above formula (2) include those shown below. The present invention is not limited to these.
- Anion X ⁇ of metal-containing onium salt compound is an anion.
- Anions such as a sulfonate anion, a carboxylate anion, an imide anion, a methide anion, a carbanion, a borate anion, a halogen anion, a phosphate anion, an antimonate anion, an arsenate anion, are mentioned.
- ZA a ⁇ , (Rf) b PF (6-b) ⁇ , R 4 c BA (4-c) ⁇ , R 4 c GaA (4-c) ⁇ , R 5 SO 3 ⁇ , (R 5 SO 2) 3 C - or (R 5 SO 2) 2 N - anion represented by are preferred.
- Two of Rf, two of R 4 and two of R 5 may be bonded to each other to form a ring.
- Z represents a phosphorus atom, a boron atom or an antimony atom.
- A represents a halogen atom (a fluorine atom is preferred).
- P represents a phosphorus atom
- F represents a fluorine atom
- B represents a boron atom
- Ga represents a gallium atom.
- S represents a sulfur atom
- O represents an oxygen atom
- C represents a carbon atom
- N represents a nitrogen atom.
- Rf is preferably an alkyl group in which 80 mol% or more of hydrogen atoms are substituted with fluorine atoms, and the alkyl group is preferably an alkyl group having 1 to 8 carbon atoms.
- alkyl group to be converted into Rf by fluorine substitution include linear alkyl groups (such as methyl, ethyl, propyl, butyl, pentyl and octyl), branched alkyl groups (such as isopropyl, isobutyl, sec-butyl and tert-butyl) and And cycloalkyl groups (cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, etc.) and the like.
- the ratio of hydrogen atoms of these alkyl groups substituted by fluorine atoms in Rf is preferably 80 mol% or more, more preferably 90, based on the number of moles of hydrogen atoms that the original alkyl group had. % Or more, particularly preferably 100%.
- the substitution ratio by fluorine atoms is within these preferable ranges, the photosensitivity of the sulfonium salt is further improved.
- Particularly preferred Rf is CF 3 ⁇ , CF 3 CF 2 ⁇ , (CF 3 ) 2 CF ⁇ , CF 3 CF 2 CF 2 ⁇ , CF 3 CF 2 CF 2 CF 2 ⁇ , (CF 3 ) 2 CFCF 2 —. , CF 3 CF 2 (CF 3 ) CF ⁇ and (CF 3 ) 3 C — .
- the b Rf's are independent of each other, and therefore may be the same as or different from each other.
- R 4 represents a phenyl group in which a part of hydrogen atoms is substituted with at least one halogen atom or electron withdrawing group.
- the halogen atom include a fluorine atom, a chlorine atom and a bromine atom.
- the electron withdrawing group include a trifluoromethyl group, a nitro group, and a cyano group.
- a phenyl group in which one hydrogen atom is substituted with a fluorine atom or a trifluoromethyl group is preferable.
- the c R 4 s are independent of each other, and therefore may be the same as or different from each other.
- R 5 represents an alkyl group having 1 to 20 carbon atoms, a perfluoroalkyl group having 1 to 20 carbon atoms, or an aryl group having 6 to 20 carbon atoms, and the alkyl group and the perfluoroalkyl group are linear, branched or Any of cyclic
- annular form may be sufficient and an aryl group may be unsubstituted or may have a substituent.
- A represents an integer of 4-6.
- b represents an integer of 1 to 5, preferably 2 to 4, particularly preferably 2 or 3.
- c represents an integer of 1 to 4, and is preferably 4.
- Examples of the anion represented by (Rf) b PF (6-b) ⁇ include (CF 3 CF 2 ) 2 PF 4 ⁇ , (CF 3 CF 2 ) 3 PF 3 ⁇ , ((CF 3 ) 2 CF) 2.
- Examples of the anion represented by R 4 c BA (4-c) ⁇ include (C 6 F 5 ) 4 B ⁇ , ((CF 3 ) 2 C 6 H 3 ) 4 B ⁇ , and (CF 3 C 6 H 4 And anions represented by 4 B ⁇ , (C 6 F 5 ) 2 BF 2 ⁇ , C 6 F 5 BF 3 ⁇ and (C 6 H 3 F 2 ) 4 B ⁇ . Of these, anions represented by (C 6 F 5 ) 4 B — and ((CF 3 ) 2 C 6 H 3 ) 4 B — are preferred.
- Examples of the anion represented by R 4 c GaA (4-c) ⁇ include (C 6 F 5 ) 4 Ga ⁇ , ((CF 3 ) 2 C 6 H 3 ) 4 Ga ⁇ , and (CF 3 C 6 H 4 ) 4 Ga ⁇ , (C 6 F 5 ) 2 GaF 2 ⁇ , C 6 F 5 GaF 3 ⁇ and an anion represented by (C 6 H 3 F 2 ) 4 Ga ⁇ .
- anions represented by (C 6 F 5 ) 4 Ga ⁇ and ((CF 3 ) 2 C 6 H 3 ) 4 Ga ⁇ are preferable.
- Examples of the anion represented by R 5 SO 3 — include those described in WO2011 / 093139. Specifically, a sulfonic acid derivative having an anion structure represented by the following formula (a1) is preferable, but not limited thereto.
- R 5a COOCH 2 CH 2 CFHCF 2 SO 3 - (a1)
- R 5a represents a monovalent organic group having 1 to 20 carbon atoms which may have a substituent.
- Preferred examples of the organic group include groups represented by the following formulas having 1 to 20 carbon atoms.
- R 5b is any monovalent group selected from an alkyl group; an aryl group; Examples of the alkyl group for R 5b include the same as the alkyl groups for R 1 and R 2 . Examples of the aryl group include the same aryl groups as R 1 and R 2 .
- W is each independently a direct bond; or —O—, —CO—, —COO—, —OCO—, —O—CO—O—, —NHCO—, —CONH—, —NH—CO—. It is any group selected from the group consisting of O—, —O—CO—NH—, —NH—, —S— and —CO—O—CH 2 —CO—O—.
- R 5c each independently represents a divalent group selected from an alkylene group; an arylene group; Examples of the alkylene group for R 5c include a divalent alkyl group for R 1 and R 2 . Examples of the arylene group of R 5c include those in which the aryl groups of R 1 and R 2 are divalent.
- m is 0 or an integer of 1 to 10. m is preferably 0 to 5, and more preferably 0 to 3.
- the number of carbons in the substituent is preferably 1 to 200, more preferably 1 to 100, and more preferably 1 More preferably, the number of carbon atoms is more preferably from 30 to 30, and particularly preferably from 3 to 30 carbon atoms.
- R 5a may have include a hydroxy group, a carboxyl group, an alkoxy group, an acyl group, an alkoxycarbonyl group, an aryl group, an aryloxy group, a phosphino group, an alkylthio group, and an arylthio group. Yes, but you are not limited to these.
- Examples of the anion represented by R 5 SO 3 — include, in addition to the anion represented by the above formula (a1), a trifluoromethanesulfonic acid anion, a pentafluoroethanesulfonic acid anion, a heptafluoropropanesulfonic acid anion, and a nonafluorobutanesulfonic acid anion.
- trifluoromethanesulfonate anion, nonafluorobutanesulfonate anion, methanesulfonate anion, butanesulfonate anion, benzenesulfonate anion, p-toluenesulfonate anion and the like can be mentioned.
- Examples of the anion represented by (R 5 SO 2 ) 3 C — include (CF 3 SO 2 ) 3 C ⁇ , (C 2 F 5 SO 2 ) 3 C ⁇ , and (C 3 F 7 SO 2 ) 3 C ⁇ . And an anion represented by (C 4 F 9 SO 2 ) 3 C — and the like.
- Examples of the anion represented by (R 5 SO 2 ) 2 N ⁇ include (CF 3 SO 2 ) 2 N ⁇ , (C 2 F 5 SO 2 ) 2 N ⁇ , and (C 3 F 7 SO 2 ) 2 N ⁇ . And an anion represented by (C 4 F 9 SO 2 ) 2 N — and the like. Moreover, two cyclic imide which parts corresponding to (R 5 SO 2) is bonded to form a ring structure also (R 5 SO 2) 2 N - and the like as the anion represented by.
- monovalent anions include perhalogenate ions (ClO 4 ⁇ , BrO 4 — etc.), halogenated sulfonate ions (FSO 3 ⁇ , ClSO 3 ⁇ etc.), sulfate ions (CH 3 SO 4).
- the anion of the metal-containing onium salt compound has an acid strength equal to or less than the anion of the photoacid generator.
- the anion structure is a bulky because the resolution is improved.
- the pKa is preferably ⁇ 2 to 6. pKa is a value obtained by analysis using ACD labs (manufactured by Fujitsu Limited).
- Metal-containing onium salt compound may be added to the resist composition as a low molecular weight component, or may be a polymer contained as a unit. That is, even if the compound represented by the above formula (1) is included in the polymer as a unit so as to be bonded to the polymer main chain at any position of R 1 , R 2 and Ar 1 of the compound. Good.
- the compound represented by the above formula (1) it is preferable to have a bond that bonds to the polymer main chain directly or via a linking group instead of one H in R 1 of the cation moiety.
- the metal-containing onium salt compound When the metal-containing onium salt compound is a polymer, it may be bonded to the polymer main chain directly or via a linking group at the anion portion instead of the cation portion.
- the unit constituting the polymer a unit derived from a monomer having a radical polymerizable group such as a vinyl group, an isopropenyl group, an acryloxy group and a methacryloxy group is preferable.
- the polymer may be a polymer including units other than the unit corresponding to the metal-containing onium salt compound. Details will be described later.
- the metal-containing onium salt compound when the metal-containing onium salt compound is a polymer, the preferred number of carbon atoms in the R 1, R 2 and Ar 1 in the formula (1) shall be excluding the number of carbon atoms of the polymer backbone.
- onium salt compound represented by the above formula (1) examples include those shown below.
- the onium salt compounds shown below include a substitution position corresponding to M, and the present invention is not limited to these.
- the metal-containing onium salt compound in one embodiment of the present invention can be synthesized by the following method.
- the synthesis example of the tin containing sulfonium salt whose Ar ⁇ 1 > in the said Formula (1) is a phenylene group, Y is a sulfur atom, and M is Sn is shown.
- a THF solution of magnesium is heated to 40 to 50 ° C., and a tetrahydrofuran (THF) solution of bromobenzene having an R 2a S— group is added dropwise.
- THF tetrahydrofuran
- a THF solution of trisubstituted organotin chloride having an R 1 group is added dropwise thereto at 50 ° C. or less, and reacted for 1 to 3 hours by a Grignard reaction to obtain a tin-containing sulfide.
- Tin-containing sulfide is oxidized using metachloroperbenzoic acid (MCPBA) or the like to obtain tin-containing sulfoxide.
- MCPBA metachloroperbenzoic acid
- a bromide having an R 2b group, magnesium and trimethylchlorosilane are used to obtain a Cl salt of tin-containing sulfonium by a Grignard reaction.
- a tin-containing sulfonium salt compound having a corresponding X- can be obtained by salt exchange or the like.
- R 1 in the following Synthesis Examples corresponding to R 1 in the formula (1), R 2a and R 2b are assumed to correspond to R 2 in the formula (1).
- a compound in which M is Ge or Pb can be synthesized in the same manner as described above.
- Y When Y is Se, it can be synthesized as follows. First, 1-bromo-4-chlorobenzene THF solution is cooled to ⁇ 78 ° C., and n-butyllithium is added dropwise. A diphenyl diselenide THF solution is dropped here to obtain 4-chlorophenyl phenyl selenide. Next, the magnesium THF solution was heated to 40 to 50 ° C., and the THF solution of organotin chloride having three R 1 groups was added dropwise at 50 ° C. or less, and reacted for 1 to 3 hours by the Grignard reaction. obtain.
- Tin-containing selenide, diphenyliodonium methylsulfate, anisole, and copper (II) benzoate monohydrate are mixed and reacted at 100 ° C. for 1 hour to obtain tin-containing selenonium methylsulfate. Subsequently, a tin-containing selenonium salt compound having the corresponding X- can be obtained by salt exchange or the like.
- Y is Te, it can be synthesized in the same manner as Se.
- Y When Y is I, it can be synthesized as follows. First, 1-bromo-4-iodobenzene, trifluoromethanesulfonic acid, benzene and dichloromethane are mixed and cooled to 0 ° C. MCPBA dichloromethane solution is dropped here and reacted for 1 hour to obtain 4-bromophenylphenyliodonium trifluoromethanesulfonate. The magnesium THF solution is then heated to 40-50 ° C. and 4-bromophenylphenyl iodonium trifluoromethanesulfonate THF solution is added dropwise.
- a THF solution of an organotin chloride having three R 1 groups is added dropwise at 50 ° C. or less, and reacted for 1 to 3 hours by a Grignard reaction to obtain tin-containing iodonium. Subsequently, a tin-containing iodonium salt compound having a corresponding X- can be obtained by salt exchange or the like.
- Photodegradable base Some embodiments of the present invention are photodegradable bases containing the metal-containing onium salt compound.
- the metal-containing onium salt compound in some embodiments of the present invention may be a polymer.
- the polymer may be a homopolymer as long as it includes a unit that functions as a photodegradable base, or may be a copolymer that includes another unit.
- the copolymer is used, other units include those that act as acid-reactive compounds and hydroxyaryl group-containing units. What acts as the acid-reactive compound and the hydroxyaryl group-containing unit will be described later.
- Resist Composition One aspect of the present invention relates to a resist composition containing the photodegradable base.
- the resist composition preferably further includes a photoacid generator and an acid-reactive compound.
- the content of the photodegradable base in the resist composition of one embodiment of the present invention is preferably 0.5 to 30 parts by mass with respect to 100 parts by mass of the acid-reactive compound described later. The amount is more preferably part by mass, and further preferably 2 to 10 parts by mass.
- the content of the photodegradable base in the resist composition is preferably 1 to 50 parts by mass with respect to 10 parts by mass of the photoacid generator. More preferably, it is ⁇ 25 parts by mass.
- bonds with a polymer it is set as the mass reference
- the resist composition according to some embodiments of the present invention preferably contains a photoacid generator.
- the photoacid generator is not particularly limited as long as it can be used in ordinary resist compositions.
- onium salt compounds such as sulfonium salts and iodonium salts, N-sulfonyloxyimide compounds, oxime sulfonate compounds, organic halogens, and the like.
- Compounds, sulfonyldiazomethane compounds and the like can be used individually by 1 type or in combination of 2 or more types. Examples of the sulfonium salt include those described in WO2011 / 093139.
- the photoacid generator preferably has a pKa of ⁇ 3 or less.
- examples of such anions include fluorine-substituted sulfonic acid.
- the photo acid generator may be added to the resist composition as a low molecular weight component, or may be contained as a polymer unit. That is, the aspect contained in the polymer as a unit so that it may couple
- the photoacid generator is a sulfonium salt
- the content of the photoacid generator in the resist composition of one embodiment of the present invention is preferably 1 to 50 parts by mass with respect to 100 parts by mass of the acid-reactive compound described later, and 3 to 30 parts by mass. More preferred is 5 to 25 parts by mass.
- the mass is based on the polymer main chain.
- the resist composition according to some embodiments of the present invention preferably contains an acid-reactive compound in addition to the photodegradable base.
- the acid-reactive compound preferably has a protecting group that is deprotected with an acid, is polymerized with an acid, or is crosslinked with an acid. That is, the acid-reactive compound is at least one selected from the group consisting of a compound having a protecting group that is deprotected by an acid, a compound having a polymerizable group that is polymerized by an acid, and a crosslinking agent having a crosslinking action by an acid. It is preferable that
- the compound having a protecting group that is deprotected by an acid is a compound that generates a polar group by deprotecting the protecting group with an acid and changes its solubility in a developing solution.
- a compound having a protecting group that is deprotected by an acid is insoluble in an alkali developer, but in an exposed area by an acid generated from the photoacid generator upon exposure. It is a compound that becomes soluble in an alkaline developer when the protecting group is deprotected from the compound.
- the developer is not limited to an alkaline developer, and may be a neutral developer or an organic solvent development. Therefore, when an organic solvent developer is used, a compound having a protecting group that is deprotected with an acid is polarized by deprotecting the protecting group from the compound in the exposed area by an acid generated from the photoacid generator upon exposure. It is a compound that generates a group and has a reduced solubility in an organic solvent developer.
- Examples of the polar group include a hydroxy group, a carboxy group, an amino group, and a sulfo group.
- Specific examples of the protecting group to be deprotected with an acid include a group that forms a tertiary alkyl ester group with a carboxy group; an alkoxyacetal group; a tetrahydropyranyl group: a siloxy group; and a benzyloxy group.
- the compound having the protecting group a compound having a styrene skeleton, a methacrylate or an acrylate skeleton pendant with these protecting groups is preferably used.
- the compound having a protecting group to be deprotected with an acid may be a protecting group-containing low molecular weight compound or a protecting group-containing polymer.
- the low molecular weight compound has a weight average molecular weight of less than 2000, and the polymer has a weight average molecular weight of 2000 or more.
- the compound having a polymerizable group that is polymerized with an acid is a compound that changes the solubility in a developer by polymerizing with an acid. For example, in the case of aqueous development, it acts on a compound that is soluble in an aqueous developer and lowers the solubility of the compound in the aqueous developer after polymerization.
- Specific examples include compounds having an epoxy group, a vinyloxy group, an oxetanyl group, and the like.
- the compound having a polymerizable group that is polymerized with an acid may be a polymerizable low-molecular compound or a polymerizable polymer.
- a crosslinking agent having a crosslinking action with an acid is a compound that changes the solubility in a developer by crosslinking with an acid. For example, in the case of aqueous development, it acts on a compound that is soluble in an aqueous developer, and lowers the solubility of the compound in the aqueous developer after polymerization or crosslinking.
- Specific examples include crosslinking agents having an epoxy group, a vinyloxy group, a 1-alkoxyamino group, an oxetanyl group, and the like.
- examples of the cross-linking partner compound that is, a compound that reacts with the cross-linking agent and changes its solubility in a developing solution include compounds having a phenolic hydroxyl group.
- the compound having a crosslinking action with an acid may be a polymerizable low molecular compound or a polymerizable polymer.
- the polymer may contain other units that are usually used in resist compositions.
- the ratio of each unit of the polymer is not particularly limited, but when the unit to which the acid-reactive compound is bonded is included as a unit of the same polymer together with other units, the acid reaction
- the unit to which the active compound is bonded is preferably 10 to 70 mol%, more preferably 15 to 65 mol%, and still more preferably 20 to 60 mol% in the total polymer unit.
- the unit (I) is preferably 0 to 60% by mole, more preferably 10 to 60% by mole, and still more preferably 20 to 60% by mole.
- the unit (II) is preferably from 0 to 70 mol%, more preferably from 5 to 70 mol%, still more preferably from 10 to 60 mol%.
- the unit (III) is preferably 0 to 90 mol%, more preferably 10 to 80 mol% of the whole.
- the unit (IV) is preferably 0 to 30 mol%, more preferably 1 to 30 mol%, and further preferably 3 to 20 mol%.
- the unit (V) is preferably 0 to 30 mol%, more preferably 1 to 30 mol%, still more preferably 3 to 20 mol%.
- the resist composition of one embodiment of the present invention includes, in addition to the above components, as optional components, an organic solvent, an acid diffusion controller, and a surfactant that are used in ordinary resist compositions.
- organic solvent an organic solvent
- an acid diffusion controller an acid diffusion controller
- surfactant that are used in ordinary resist compositions.
- Organic carboxylic acids, dissolution inhibitors, stabilizers, dyes, sensitizers, and the like may be included in combination.
- organic solvent examples include ethylene glycol monoethyl ether acetate, cyclohexanone, 2-heptanone, propylene glycol monomethyl ether (PGME), propylene glycol monomethyl ether acetate (PGMEA), propylene glycol monomethyl ether propionate, propylene glycol monoethyl ether.
- PGME propylene glycol monomethyl ether
- PGMEA propylene glycol monomethyl ether acetate
- propylene glycol monomethyl ether propionate propylene glycol monoethyl ether.
- the acid diffusion control agent controls the diffusion phenomenon of the acid generated from the photoacid generator in the resist film, and has an effect of controlling an undesirable chemical reaction in the non-exposed region. Therefore, the storage stability of the resulting resist composition is further improved, the resolution as a resist is further improved, and changes in the line width of the resist pattern due to fluctuations in the holding time from exposure to development processing can be suppressed. Thus, a resist composition having excellent process stability can be obtained.
- the acid diffusion controller include a compound having one nitrogen atom in the same molecule, a compound having two, a compound having three nitrogen atoms, an amide group-containing compound, a urea compound, and a nitrogen-containing heterocyclic compound. It is done.
- the photodegradable base other than the metal-containing onium salt compound according to one embodiment of the present invention that is exposed to light upon exposure to generate a weak acid can be used.
- the acid diffusion control agent is included, the content thereof is preferably 0.01 to 20 parts by mass, more preferably 0.03 to 15 parts by mass with respect to 100 parts by mass of the acid-reactive compound. 0.05 to 10 parts by mass is more preferable.
- the above content does not include the metal-containing onium salt compound of one embodiment of the present invention.
- the surfactant is preferably used for improving the coating property.
- surfactants include nonionic surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene alkyl allyl ethers, polyoxyethylene polyoxypropylene block copolymers, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, etc. Agents, fluorosurfactants, organosiloxane polymers, and the like.
- the content of the surfactant is preferably 0.0001 to 2 parts by mass, more preferably 0.0005 to 1 part by mass with respect to 100 parts by mass of the acid-reactive compound.
- organic carboxylic acid examples include aliphatic carboxylic acid, alicyclic carboxylic acid, unsaturated aliphatic carboxylic acid, oxycarboxylic acid, alkoxycarboxylic acid, ketocarboxylic acid, benzoic acid derivative, phthalic acid, terephthalic acid, isophthalic acid, 2 -Naphthoic acid, 1-hydroxy-2-naphthoic acid, 2-hydroxy-3-naphthoic acid and the like.
- preferred organic carboxylic acids include aromatic organic carboxylic acids, among which, for example, benzoic acid, 1-hydroxy-2-naphthoic acid and 2-hydroxy-3-naphthoic acid are preferred.
- the content of the organic carboxylic acid is preferably 0.01 to 10 parts by mass, more preferably 0.01 to 5 parts by mass, and still more preferably 0.01 to 3 parts by mass with respect to 100 parts by mass of the acid-reactive compound. There is a part.
- the resist composition component is preferably dissolved in the organic solvent and dissolved in a solid content concentration of 1 to 40% by mass in the resist composition containing the organic solvent. More preferably, it is 1 to 30% by mass, and further preferably 3 to 20% by mass.
- the polymer When the resist composition of one embodiment of the present invention contains a polymer, the polymer preferably has a weight average molecular weight of 2,000 to 200,000, more preferably 2,000 to 50,000, and even more preferably 2,000 to 15,000. .
- the polymer preferably has a dispersity (molecular weight distribution) (Mw / Mn) of 1.0 to 2.2, more preferably 1.2 to 2.0 from the viewpoint of sensitivity.
- the polymer weight average molecular weight and degree of dispersion are defined as polystyrene equivalents by GPC measurement.
- the resist composition of one embodiment of the present invention may contain a fluorine-containing water-repellent polymer.
- a fluorine-containing water-repellent polymer Although there is no restriction
- the fluorine content of the fluorine water-repellent polymer is preferably such that 25% or more of the hydrogen atoms in the hydrocarbon groups in the fluorine water-repellent polymer are fluorinated, more preferably 50% or more. preferable.
- the content of the fluorine water-repellent polymer in the resist composition is 0.5 to 10 parts by mass with respect to 100 parts by mass of the polymer of the embodiment of the present invention (which is not the fluorine water-repellent polymer). It is preferable from the viewpoint of improving the hydrophobicity of the resist film.
- a fluorine water-repellent polymer may be used independently and may be used in combination of 2 or more types.
- composition of one embodiment of the present invention can be obtained by mixing the components of the above composition, and the mixing method is not particularly limited.
- One aspect of the present invention includes a resist film forming step of forming a resist film by, for example, applying the resist composition on a substrate, and a photolithography step of exposing the resist film. And a pattern forming step of obtaining a photoresist pattern by developing the exposed resist film.
- One embodiment of the present invention is a method for producing a substrate having a pattern before obtaining individualized chips, including a resist film forming step, a photolithography step, and a pattern forming step, using the resist composition. Also good.
- the active energy ray used for exposure in the photolithography process may be light that can activate the metal-containing onium salt compound of one embodiment of the present invention to generate an acid, such as KrF excimer laser light, ArF excimer laser light, F 2 excimer laser light, electron beam, UV, visible light, X-ray, electron beam, ion beam, i-ray, EUV and the like are meant.
- the active energy ray used for exposure in the photolithography step is preferably ionizing radiation such as electron beam (EB) or extreme ultraviolet light (EUV).
- the amount of light irradiation varies depending on the type and blending ratio of each component in the photocurable composition, the film thickness of the coating film, and the like, but is preferably 1 J / cm 2 or less or 1000 ⁇ C / cm 2 or less.
- the resist composition may be subjected to second exposure with ultraviolet rays or the like after irradiation with ionizing radiation such as EUV. preferable.
- a solution of magnesium (1.71 g) in tetrahydrofuran (16.7 mL) is heated at 50 ° C., and then a solution of 2-bromodibenzothiophene (15.5 g) in tetrahydrofuran (33.0 mL) is added dropwise.
- a solution of trimethyltin chloride (12.3 g) in tetrahydrofuran (6.0 mL) is added dropwise at 30 ° C. or lower. After stirring for 1 hour, saturated aqueous ammonium chloride solution is added dropwise to stop the reaction.
- TMSnDBT tin-containing sulfide
- a solution of magnesium (0.4 g) in tetrahydrofuran (10.0 mL) is heated to 50 ° C., and then a solution of bromobenzene (2.14 g) in tetrahydrofuran (2.1 mL) is added dropwise to prepare a Grignard reagent (phenylmagnesium bromide). .
- the Grignard reagent ((6.9 mL)) was added dropwise at 30 ° C. or lower to a mixed solution of tin-containing sulfoxide (2.0 g), trimethylchlorosilane (1.79 g) and tetrahydrofuran (24.0 g) obtained in Synthesis Example 2 above. To do.
- PDB2 (PhTMSnDBT-PFBS) was obtained as white crystals (0.3 g, yield) in the same manner as in Synthesis Example 4 except that potassium nonafluorobutanesulfonate (0.29 g) was used instead of camphorsulfonic acid (0.2 g). 48%).
- the monomer ratio of the copolymer unit in some embodiments of the present invention is not limited to the following.
- any of (A-1) to (A-3) and triphenylsulfonium nonafluorobutanesulfonate (B-1) as the photoacid generator Example 1 except that any one of (B-1) to (B-4) shown below and any one of the above PDB2 to PDB9 is used as an acid diffusion control agent instead of the above PDB1 in the amount shown in Table 1.
- radiation-sensitive resist compositions (H-2) to (H-40) are obtained.
- the pKa of the photodegradable bases (PDB1 to (PDB13) and photoacid generators (B-1) to (B-4) used in Examples and Comparative Examples are as follows.
- PDB1 1.17, PDB2: -3.57
- PDB3 -2.76
- PDB4 -2.76
- PDB5 1.17
- PDB6 -3.57
- PDB7 -2.76
- PDB8 - 2.76
- PDB10 1.17
- PDB12 -2.76
- PDB13 -2.76.
- B-2 -2.76, B-3: -2.76, B-4: -2.76.
- Each sensitive radioactive resist composition was spin-coated on a silicon wafer by a spin coater and then pre-baked on a hot plate at 110 ° C. for 60 seconds to obtain a coating film having a thickness of 150 nm.
- a mask so as to obtain a 90 nm line pattern exposure is performed with an ArF excimer laser stepper (wavelength 193 nm), and then post-baking is performed at 110 ° C. for 90 seconds. Thereafter, development is performed for 60 seconds using an aqueous 2.38 mass% tetramethylammonium hydroxide solution, and then rinsed with pure water for 30 seconds to obtain a patterned substrate.
- the sensitivity, resolution, focus depth, and line edge roughness at this time are based on the values of Comparative Example 1, and the sensitivity, resolution, and focus of Examples 1 to 36 and Comparative Examples 2 to 16 are compared with the standard.
- the depth and line edge roughness performances are evaluated using the following as indices.
- a scanning electron microscope is used for measuring the resist pattern.
- ⁇ When improvement of 10% or more is observed with respect to Comparative Example 1.
- X When the improvement is less than 5% with respect to Comparative Example 1.
- sensitivity The minimum exposure for reproducing a 90 nm line pattern is shown. The sensitivity is better as the minimum exposure is smaller.
- the focal position is moved up and down to allow exposure with a minimum exposure that reproduces a 90 nm pattern on the mask, and after exposure bake (PEB) and development, an acceptable focus that can reproduce a 90 nm line pattern. Indicates the range. The larger the focus range, the smaller and better the pattern dimension change with respect to the focus depth change.
- PEB exposure bake
- Line edge roughness For the range of 2.5 ⁇ m edge in the longitudinal direction of the 90 nm line pattern obtained with the minimum exposure to reproduce the 90 nm line pattern, measure the distance from the reference line where the edge should be 50 points, and calculate the standard deviation ( ⁇ ) The triple value (3 ⁇ ) was calculated as LER. The smaller the value, the smaller the roughness and the more uniform pattern edge is obtained.
- Examples 1 to 40 using photodegradable bases (PDB1 to 9) containing a specific metal are excellent in sensitivity, resolution, depth of focus and LWR characteristics.
- Comparative Examples 1 to 20 using the photodegradable base (PDB 10 to 13) containing no metal problems remain in sensitivity, resolution, depth of focus, and LWR characteristics.
- the resist composition containing the metal-containing onium salt compound as a photo-disintegrating base in one embodiment of the present invention has excellent sensitivity, resolution, and depth of focus in lithography, and reduces LWR in a fine pattern. It turns out that it has the effect which can be done.
- the undecomposed metal-containing onium salt compound acts as an acid diffusion control agent in the unexposed areas, it excels in lithography sensitivity, resolution, and depth of focus, and reduces LER (Line edge roughness) in fine patterns. it can.
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Abstract
Description
しかし、急速な微細化に伴い、酸発生剤を用いた化学増幅型レジストでは露光によって発生した酸がレジスト内で拡散し、リソグラフィの性能に大きな影響を及ぼし、コントラストやラインパターンのラインエッジラフネス(LER)特性が低減するという問題点がある。そこで、酸発生剤から生成した酸の拡散を適度に制御する目的で酸拡散制御剤をレジスト組成物に含有させ、解像度を高めることが提案されている(特許文献1)。一方で酸拡散性を制御しすぎると酸による化学反応が制限され、コントラストが低下する場合がある。
そのため、露光により分解して酸拡散制御性を失う光崩壊性塩基を用いることにより、コントラストを改善することが提案されている(特許文献2)。
また本発明のいくつかの態様は、上記オニウム塩化合物を含む光崩壊性塩基、該光崩壊性塩基を含むレジスト組成物、及び、上記レジスト組成物を用いたデバイスの製造方法を提供することを課題とする。
Ar1は、炭素数5~20のアリーレン基であり、上記アリーレン基の水素原子の一部又は全部は置換されていてもよい。
前記アルキル基は少なくとも1つのメチレン基に代えてヘテロ原子含有基を含んでいても良く、前記アリール基及びアリーレン基は、環構造中に少なくとも1つの炭素原子に代えてヘテロ原子を含んでいても良い。
Yは、ヨウ素原子、硫黄原子、セレン原子及びテルル原子からなる群より選択されるいずれかであり、Yがヨウ素原子であるときnは1であり、Yが硫黄原子、セレン原子及びテルル原子のいずれかであるときnは2である。
Ar1及び2つのR2のうちいずれか2つ以上が互いに結合してこれらが結合しているYと共に環構造を形成していてもよく、該環構造中にヘテロ原子を含んでいてもよい。
X-はアニオンである。
さらに、本発明の別の態様は、上記レジスト組成物を用いて基板上にレジスト膜を形成する工程と、前記レジスト膜を露光する工程と、露光されたレジスト膜を現像してレジストパターンを得る工程と、を含むデバイスの製造方法である。
<1>金属含有オニウム塩化合物
本発明のひとつの態様の金属含有オニウム塩化合物は、上記構造を有することを特徴とする。なお、上記式(1)中、-M-R3基は一つであるが置換基としていくつか含んでいても良い。
さらに、上記式(1)で示される金属含有オニウム塩化合物のカチオンはモノカチオンを示しているが、ポリカチオンであってもよく、ポリカチオンであるときのアニオンはそれに対応するものとする。
上記金属含有オニウム塩化合物は特定の金属原子を含むことによってEUV等の電離放射線に対する膜吸収が増大し2次電子の発生効率が向上することから金属含有オニウム塩化合物並びに光酸発生剤の分解効率を改善することが可能となる。金属含有オニウム塩化合物が光酸発生剤よりも弱い共役塩基を持つ塩である場合、未露光部では、光酸発生剤から生成した酸と反応することで光酸発生剤酸由来の酸を失活させることが出来、酸拡散制御剤として作用し得る。また、金属含有オニウム塩化合物が光酸発生剤と同等の共役塩基を持つ塩である場合でも、未露光部ではカチオンに存在する特定の金属が光酸発生剤由来の酸を失活させることが出来、酸拡散制御剤として作用し得る。そのため、本発明のひとつの態様の金属含有オニウム塩化合物をレジスト組成物に用いた場合、感度、解像度及びパターン形成能の特性に優れるレジスト組成物とすることができる。
本発明のひとつの態様における金属含有オニウム塩化合物のカチオンは、下記で示される。
2価のヘテロ原子含有基を含むアルキル基としては、例えば、アルコキシ基;アルキルカルボニルオキシ基;ラクトン構造、スルトン構造及びラクタム構造等のヘテロ環構造を有するアルキル基;等が挙げられる。
さらに、これらアルキル基の炭素-炭素一重結合の少なくとも1つが、炭素-炭素二重結合又は炭素-炭素三重結合に置換されたアルケニル基又はアルキニル基;等となったものもR1及びR2として挙げることができる。
上記RSpとしては、直鎖、分岐又は環状のアルキル基が挙げられる。ArSpとしては、フェニル基及びナフチル基等の炭素数12以下の芳香族炭化水素基、並びに環構造中に炭素原子に代えてヘテロ原子を含んでいても良い芳香族複素環基が挙げられる。なお、R1及びR2が置換基を有する場合の各R1~R2の総炭素数は、置換基を含めて1~20であることが好ましく、5~15であることがさらに好ましく、6~10であることが特に好ましい。
置換基としてのアルキル基(RSp)、アルケニル基及びアリール基(ArSp)としては、上記R1~R2の上記アルキル基、上記アルケニル基及び上記アリール基と同様のものが挙げられる。
置換基としてのハロゲン原子としては、フッ素原子、塩素原子及び臭素原子等が挙げられる。
R2としては、メチル基、エチル基、n-プロピル基、イソプロピル基、n-ブチル基、t-ブチル基、n-ペンチル基、n-ヘキシル基、シクロペンチル基、シクロヘキシル基、アダマンチル基及びアリール基等が好ましい。
Ar1としては、フェニル基及びナフチル基等が好ましい。
MがSnのとき、R1はメチル、n-ブチル及びフェニル等であることが溶解性の理由から好ましい。また、各R1は異なっていても良いが、合成の点からMに結合する3つのR1は同じであることが好ましい。
なお、R1のうちいずれか2つ以上が互いに結合してこれらが結合しているMと共に環構造を形成していてもよく、該環構造中にヘテロ原子を含んでいてもよい。
Ar1及び2つのR2のうちいずれか2つ以上が互いに結合してこれらが結合しているYと共に環構造を形成していてもよく、該環構造中にヘテロ原子を含んでいてもよい。上記Yが硫黄原子、セレン原子及びテルル原子のいずれかであるときのこのようなカチオンとしては例えば下記が挙げられるが、本発明においてはこれらに限定されない。
上記式(2)で示されるオニウム塩化合物のヨードニウムカチオンの具体的な構造としては、下記に示すものが挙げられる。本発明はこれらに限定されるものではない。
X-はアニオンである。上記アニオンとしては特に制限はなく、スルホン酸アニオン、カルボン酸アニオン、イミドアニオン、メチドアニオン、カーボアニオン、ボレートアニオン、ハロゲンアニオン、リン酸アニオン、アンチモン酸アニオン、ヒ素酸アニオン等のアニオンが挙げられる。
より詳しくは、アニオンとして、ZAa-、(Rf)bPF(6-b) -、R4 cBA(4-c) -、R4 cGaA(4-c) -、R5SO3 -、(R5SO2)3C-又は(R5SO2)2N-で表されるアニオンが好ましく挙げられる。Rfの2個、R4の2個及びR5の2個はそれぞれ、互いに結合して環を形成してもよい。
Zは、リン原子、ホウ素原子又はアンチモン原子を表す。Aはハロゲン原子(フッ素原子が好ましい。)を表す。
Pはリン原子、Fはフッ素原子、Bはホウ素原子、Gaはガリウム原子を表す。
Sはイオウ原子、Oは酸素原子、Cは炭素原子、Nは窒素原子を表す。
フッ素原子による置換割合がこれら好ましい範囲にあると、スルホニウム塩の光感応性がさらに良好となる。特に好ましいRfとしては、CF3 -、CF3CF2 -、(CF3)2CF-、CF3CF2CF2 -、CF3CF2CF2CF2 -、(CF3)2CFCF2 -、CF3CF2(CF3)CF-及び(CF3)3C-が挙げられる。b個のRfは、相互に独立であり、従って、互いに同一でも異なっていてもよい。
上記式(a)において、R5aは、置換基を有していてもよい炭素数1~20の1価の有機基を示す。上記有機基として、好ましくは、炭素数1~20の下記式で表される基が挙げられる。
R5b-(W-R5c-)m- (a2)
また、Wは、各々独立に、直接結合;又は-O-、-CO-、-COO-、-OCO-、-O-CO-O-、-NHCO-、-CONH-、-NH-CO-O-、-O-CO-NH-、-NH-、-S-及び-CO-O-CH2-CO-O-からなる群より選ばれるいずれかの基である。
R5cは、各々独立に、アルキレン基;アリーレン基;より選ばれるいずれかの2価の基である。上記R5cのアルキレン基は、R1及びR2のアルキル基が2価となったものが挙げられる。上記R5cのアリーレン基は、R1及びR2のアリール基が2価となったものが挙げられる。
なお、R5aが置換基を有している場合、その置換基の炭素数も含めて、炭素数1~200であることが好ましく、炭素数1~100であることがより好ましく、炭素数1~30であることがさらに好ましく、炭素数3~30であることが特に好ましい。
R5aが有していてもよい上記置換基としては、ヒドロキシ基、カルボキシル基、アルコキシ基、アシル基、アルコキシカルボニル基、アリール基、アリーロキシ基、ホスフィノ基、アルキルチオ基及びアリールチオ基等を挙げることができるが、これらに制限されない。
R5SO3 -で表されるアニオンとしては、上記式(a1)に示すアニオン以外に、トリフルオロメタンスルホン酸アニオン、ペンタフルオロエタンスルホン酸アニオン、ヘプタフルオロプロパンスルホン酸アニオン、ノナフルオロブタンスルホン酸アニオン、ペンタフルオロフェニルスルホン酸アニオン、p-トルエンスルホン酸アニオン、ベンゼンスルホン酸アニオン、カンファースルホン酸アニオン、メタンスルホン酸アニオン、エタンスルホン酸アニオン、プロパンスルホン酸アニオン及びブタンスルホン酸アニオン等が挙げられる。これらのうち、トリフルオロメタンスルホン酸アニオン、ノナフルオロブタンスルホン酸アニオン、メタンスルホン酸アニオン、ブタンスルホン酸アニオン、ベンゼンスルホン酸アニオン及びp-トルエンスルホン酸アニオン等が挙げられる。
また、レジスト組成物中に光酸発生剤と共に上記金属含有オニウム塩化合物を含有させるときは、上記金属含有オニウム塩化合物のアニオンは、該光酸発生剤が有するアニオンと酸強度が同等以下のものを用いることが、光崩壊性塩基として作用するため感度及び酸拡散制御の点から好ましい。また、アニオン構造がバルキーであると、解像性が高まるため好ましい。
より具体的には、pKaが-2~6であることが好ましい。
pKaは、ACD labs(富士通(株)製)を用いて解析して得られた値である。
上記金属含有オニウム塩化合物は、低分子量成分としてレジスト組成物中に加えた態様でもよいが、ユニットとして含有したポリマーであってもよい。すなわち、上記式(1)で表される化合物が、該化合物のR1、R2及びAr1のいずれかの位置でポリマー主鎖に結合するようユニットとしてポリマーに含まれた態様であってもよい。例えば、上記式(1)で表される化合物の場合、カチオン部分のR1中の1つのHに代えて、ポリマー主鎖に直接又は連結基を介して結合する結合手を有することが好ましい。上記金属含有オニウム塩化合物がポリマーであるとき、カチオン部分に代えて、アニオン部分でポリマー主鎖に直接又は連結基を介して結合していてもよい。
ポリマーを構成するユニットとしては、ビニル基、イソプロペニル基、アクリルオキシ基及びメタクリルオキシ基等のラジカル重合性基を有するモノマー由来のユニットが好ましい。上記ポリマーは、上記金属含有オニウム塩化合物に対応するユニット以外の他のユニットを含むポリマーであってもよい。詳しくは後述する。
なお、上記金属含有オニウム塩化合物がポリマーであるとき、式(1)における上記R1、R2及びAr1の好ましい炭素数は、ポリマー主鎖の炭素数を除いたものとする。
本発明のひとつの態様における金属含有オニウム塩化合物は、以下の方法により合成できる。
下記においては、上記式(1)におけるAr1がフェニレン基であり、Yが硫黄原子であり、MがSnであるスズ含有スルホニウム塩の合成例を示す。まず、マグネシウムのTHF溶液を40~50℃に加熱し、R2aS-基を有するブロモベンゼンのテトラヒドロフラン(THF)溶液を滴下する。ここにR1基を有する3置換有機スズ塩化物のTHF溶液を50℃以下で滴下し、グリニャール反応により1~3時間反応させ、スズ含有スルフィドを得る。
スズ含有スルフィドをメタクロロ過安息香酸(MCPBA)等を用いて酸化し、スズ含有スルホキシドを得る。その後、R2b基を有する臭化物とマグネシウムとトリメチルクロロシランを用い、グリニャール反応によりスズ含有スルホニウムのCl塩を得る。次いで、塩交換等により対応するX-を有するスズ含有スルホニウム塩化合物を得ることができる。
なお、下記合成例中のR1は上記式(1)におけるR1に対応し、R2a及びR2bは上記式(1)におけるR2に対応するものとする。
MがGe又はPbのものは、上記と同様に合成できる。
スズ含有セレニドとジフェニルヨードニウムメチル硫酸塩とアニソールと安息香酸銅(II)一水和物とを混合し、100℃で1時間反応させ、スズ含有セレノニウムメチル硫酸塩を得る。次いで塩交換等により対応するX-を有するスズ含有セレノニウム塩化合物を得ることができる。YがTeのときもSeと同様に合成できる。
本発明のいくつかの態様は、上記金属含有オニウム塩化合物を含有する光崩壊性塩基である。
本発明のひとつの態様は、上記光崩壊性塩基を含むレジスト組成物に関する。上記レジスト組成物は、光酸発生剤と酸反応性化合物とをさらに含むことが好ましい。
また、レジスト組成物が光酸発生剤を含有するとき、上記光崩壊性塩基のレジスト組成物中の含有量は光酸発生剤10質量部に対し1~50質量部であることが好ましく、3~25質量部であることがより好ましい。上記範囲内で上記光崩壊性塩基をレジスト組成物中に含有させることで、感度、解像度及びパターン形成能に優れた特性を有することができる。
含有量の算出において、有機溶剤はレジスト組成物成分に含まないこととする。
また、上記光崩壊性塩基がポリマーに結合する場合は、ポリマー主鎖を除いた質量基準とする。
なお、上記光崩壊性塩基は一種単独で又は二種以上を組み合わせて用いてもよい。
<3-1>光酸発生剤
本発明のいくつかの態様のレジスト組成物は、光酸発生剤を含有することが好ましい。
光酸発生剤としては、通常のレジスト組成物に用いられるものであれば特に制限はなく、例えば、スルホニウム塩、ヨードニウム塩等のオニウム塩化合物、N-スルホニルオキシイミド化合物、オキシムスルホネート化合物、有機ハロゲン化合物、スルホニルジアゾメタン化合物等が挙げられる。これらは一種単独で又は二種以上を組み合わせて用いることができる。
スルホニウム塩としては、例えばWO2011/093139号公報に記載のものが挙げられる。
より具体的には、光酸発生剤はpKaが-3以下であることが好ましい。そのようなアニオンとしては、フッ素置換スルホン酸等が挙げられる。
上記光酸発生剤がポリマーに結合する場合は、ポリマー主鎖を除いた質量基準とする。
本発明のいくつかの態様のレジスト組成物は、上記光崩壊性塩基に加えて、酸反応性化合物を含有することが好ましい。
上記酸反応性化合物は、酸により脱保護する保護基を有する、酸により重合する、又は、酸により架橋することが好ましい。つまり、上記酸反応性化合物は、酸により脱保護する保護基を有する化合物、酸により重合する重合性基を有する化合物、及び、酸により架橋作用を有する架橋剤からなる群より選択される少なくともいずれかであることが好ましい。
酸で脱保護する保護基の具体例としては、カルボキシ基と第3級アルキルエステル基を形成する基;アルコキシアセタール基;テトラヒドロピラニル基:シロキシ基;及びベンジロキシ基;等が挙げられる。該保護基を有する化合物として、これら保護基がペンダントしたスチレン骨格、メタクリレート又はアクリレート骨格を有する化合物等が好適に用いられる。
酸により脱保護する保護基を有する化合物は、保護基含有低分子化合物であっても、保護基含有ポリマーであってもよい。本発明のいくつかの態様において、低分子化合物とは重量平均分子量が2000未満のものであり、ポリマーとは重量平均分子量が2000以上のものとする。
酸により重合する重合性基を有する化合物は、重合性低分子化合物であっても、重合性ポリマーであってもよい。
酸により架橋作用を有する化合物は、重合性低分子化合物であっても、重合性ポリマーであってもよい。
本発明のひとつの態様のレジスト組成物には、上記成分以外に必要により任意成分として、通常のレジスト組成物で用いられる有機溶剤、酸拡散制御剤、界面活性剤、有機カルボン酸、溶解阻止剤、安定剤、色素及び増感剤等を組み合わせて含んでいてもよい。
酸拡散制御剤としては、例えば、同一分子内に窒素原子を1個有する化合物、2個有する化合物、窒素原子を3個有する化合物、アミド基含有化合物、ウレア化合物、含窒素複素環化合物等が挙げられる。また、酸拡散制御剤として、露光により感光し弱酸を発生する本発明のひとつの態様の上記金属含有オニウム塩化合物以外の上記光崩壊性塩基を用いることもできる。具体的には、特許3577743号、特開2001-215689号、特開2001-166476号、特開2008-102383号、特開2010-243773号、特開2011-37835号及び特開2012-173505号に記載の化合物が挙げられる。
酸拡散制御剤を含む場合その含有量は、上記酸反応性化合物100質量部に対して、0.01~20質量部であることが好ましく、0.03~15質量部であることがより好ましく、0.05~10質量部であることがさらに好ましい。上記含有量には、本発明のひとつの態様の金属含有オニウム塩化合物は含まないものとする。
界面活性剤の含有量は、上記酸反応性化合物100質量部に対して0.0001~2質量部であることが好ましく、0.0005~1質量部であることがより好ましい。
有機カルボン酸の含有量は、酸反応性化合物100質量部に対して0.01~10質量部が好ましく、より好ましくは0.01~5質量部、更により好ましくは0.01~3質量部部ある。
レジスト組成物成分は、上記有機溶剤に溶解し、固形分濃度として、有機溶剤を含むレジスト組成物中1~40質量%で溶解していることが好ましい。より好ましくは1~30質量%、更に好ましくは3~20質量%である。
本発明のいくつかの態様において、ポリマーの重量平均分子量及び分散度は、GPC測定によるポリスチレン換算値として定義される。
上記含フッ素はっ水ポリマーとしては、特に制限はないが液浸露光プロセスに通常用いられるものが挙げられ、上記ポリマーよりもフッ素原子含有率が大きい方が好ましい。それにより、レジスト組成物を用いてレジスト膜を形成する場合に、含フッ素はっ水ポリマーのはっ水性に起因して、レジスト膜表面に上記含フッ素はっ水ポリマーを偏在化させることができる。
本発明のひとつの態様は、上記レジスト組成物を基板上に塗布する等してレジスト膜を形成するレジスト膜形成工程と、上記レジスト膜を露光するフォトリソグラフィ工程と、露光されたレジスト膜を現像してフォトレジストパターンを得るパターン形成工程と、を含むデバイスの製造方法である。
本発明のひとつの形態は、上記レジスト組成物を用いて、レジスト膜形成工程とフォトリソグラフィ工程とパターン形成工程とを含み、個片化チップを得る前のパターンを有する基板の製造方法であってもよい。
本発明のひとつの態様において、フォトリソグラフィ工程の露光に用いる活性エネルギー線としては、電子線(EB)又は極端紫外線(EUV)等の電離放射線が好ましく挙げられる。
上記レジスト組成物は、上記増感化合物を含むか、対応する上記増感化合物を増感ユニットとしてポリマーに含む場合、EUV等の電離放射線の照射後に、紫外線等で第2の露光を行うことも好ましい。
[合成例1]スズ含有スルフィドの合成
上記合成例2で得たスズ含有スルホキシド(2.0g)とトリメチルクロロシラン(1.79g)とテトラヒドロフラン(24.0g)の混合液に上記グリニャール試薬((6.9mL))を30℃以下で滴下する。1時間撹拌後、飽和塩化アンモ二ウム水溶液を滴下し反応を停止する。水で洗浄後、溶媒を留去し、水に溶解する。酢酸エチルにて洗浄し、ジクロロメタンで抽出後、溶剤を留去し、スズ含有スルホニウム塩化物塩(PhTMSnDBT-Cl)(0.6g、収率23%)を白色結晶として得る。
カンファースルホン酸(0.2g)の代わりにソジウム-4-(1-アダマンタンカルボニルオキシ)1,1,2-トリフルオロブタン-1-スルホナート(0.34g)を用いた以外は、合成例4と同様にしてPDB3(PhTMSnDBT-AdTF)を白色結晶(0.69g、収率77%)で得る。
カンファースルホン酸(0.2g)の代わりに(ソジウム-4-(3-ヒドロキシ-1-アダマンタンカルボニルオキシ)1,1,2-トリフルオロブタン-1-スルホナート(0.35g)を用いた以外は、合成例4と同様にしてPDB4(PhTMSnDBT-HAdTF)を白色結晶(0.55g、収率79%)で得る。
トリメチルスズクロリド(12.3g)の代わりに、トリブチルスズクロリド(20.1g)を用いた以外は、合成例1~4と同様にしてPDB5(PhTBSnDBT-CAS)を白色結晶(0.54g、収率80%)で得る。
カンファースルホン酸(0.2g)の代わりにノナフルオロブタンスルホン酸カリウム(0.29g)を用いた以外は、合成例8と同様にしてPDB6(PhTBSnDBT-PFBS)を白色結晶(0.54g、収率80%)で得る。
カンファースルホン酸(0.2g)の代わりにソジウム-4-(1-アダマンタンカルボニルオキシ)1,1,2-トリフルオロブタン-1-スルホナート(0.34g)を用いた以外は、合成例8と同様にしてPDB7(PhTBSnDBT-AdTF)を白色結晶(0.64g、収率80%)で得る。
カンファースルホン酸(0.2g)の代わりにソジウム-4-(3-ヒドロキシ-1-アダマンタンカルボニルオキシ)1,1,2-トリフルオロブタン-1-スルホナート(0.35g)を用いた以外は、合成例8と同様にしてPDB8(PhTMSnDBT-HAdTF)を白色結晶(0.64g、収率79%)で得る。
2-ブロモジベンゾチオフェン(15.5g)の代わりに、4-ブロモジフェニルスルフィド(15.6g)を用い、カンファースルホン酸(0.2g)の代わりにソジウム-4-(1-アダマンタンカルボニルオキシ)1,1,2-トリフルオロブタン-1-スルホナート(0.33g)を用いた以外は、合成例1~4と同様にしてPDB9(TMSnTPS-AdTF)を白色結晶(0.55g、収率80%)で得る。
<レジスト組成物の調製>
ベース重合体としてのポリマー(A-1)(重量平均分子量:約10000、下記式中、a=0.4、b=0.4、c=0.2)100質量部と、光酸発生剤としてのトリフェニルスルホニウムノナフルオロブタンスルホナート(B-1)8質量部と、酸拡散制御剤としての光崩壊性塩基(PDB1)5質量部と、溶媒としてのプロピレングリコールモノメチルエーテルアセテート1800質量部とを混合し、その後PTFEフィルターでろ過して、感放射線性レジスト組成物(H-1)溶液を調製する。レジスト組成物の詳細を表1に示す。
なお、本発明のいくつかの態様における共重合体のユニットのモノマー比は下記に限定されない。
ベース重合体としてのポリマー(A-1)に代えて(A-1)~(A-3)のいずれかと、光酸発生剤としてトリフェニルスルホニウムノナフルオロブタンスルホナート(B-1)に代えて下記に示す(B-1)~(B-4)のいずれかと、酸拡散制御剤として上記PDB1に代えて上記PDB2~PDB9のいずれかと、を表1に示す配合量で用いる以外は実施例1と同様にして、感放射線性レジスト組成物(H-2)~(H-40)を得る。
ベース重合体としてのポリマー(A-1)に代えて(A-1)~(A-3)のいずれかと、光酸発生剤としてトリフェニルスルホニウムノナフルオロブタンスルホナート(B-1)に代えて上記光酸発生剤(B-1)~(B-4)のいずれかと、酸拡散制御剤として光崩壊性塩基(PDB1)に代えて下記に示すPDB10~PDB13のいずれかと、を表1に示す配合量で用いる以外は実施例1と同様にして、感放射線性組成物(H-37)~(H-52)を得る。
PDB1:1.17、PDB2:-3.57、PDB3:-2.76、PDB4:―2.76、PDB5:1.17、PDB6:-3.57、PDB7:-2.76、PDB8:-2.76、PDB9:-2.76、PDB10:1.17、PDB11:-3.57、PDB12:-2.76、PDB13:-2.76。
B-1:-3.57、B-2:-2.76、B-3:-2.76、B-4:-2.76。
各感応性放射性レジスト組成物をシリコンウェハ上にスピンコータにより回転塗布した後、ホットプレート上で110℃で60秒間プレベークし、膜厚150nmの塗布膜を得た。90nmのラインパターンが得られるようにマスクを用い、ArFエキシマレーザーステッパー(波長193nm)により露光し、次いで110℃で90秒間ポストベークを行う。その後、2.38質量%のテトラメチルアンモニウムヒドロキシド水溶液を用いて60秒間現像を行い、その後30秒間純水でリンスしてパターン形成された基板を得る。
このときの感度、解像性、焦点深度及びラインエッジラフネスを比較例1の値を基準とし、基準と比べたときの実施例1~36及び比較例2~16の感度、解像性、焦点深度及びラインエッジラフネスの各性能を下記を指標として評価する。なお、レジストパターンの測長には走査型電子顕微鏡を用いる。
○:比較例1に対して10%以上の向上が見られた場合。
△:比較例1に対して10%未満、5%以上の向上の場合。
×:比較例1に対して5%未満の向上の場合。
90nmのラインパターンを再現する最小露光量で示した。感度は最小露光量が小さいほど良好である。
90nmのラインパターンを再現する最小露光量により解像できるラインパターンの幅(nm)、即ち、限界解像力を示す。解像性は、数値が小さいほど良好である。
焦点の位置を上下に移動させて、マスクにおける90nmパターンを再現する最小露光量で露光し、露光後ベーク(PEB)及び現像を行ったときに、90nmのラインパターンを再現できる許容可能な焦点の範囲を示す。焦点の範囲が大きいほど焦点深度の変化に対するパターン寸法変化が小さく良好である。
90nmのラインパターンを再現する最小露光量により得られた90nmのラインパターンの長手方向のエッジ2.5μmの範囲について、エッジがあるべき基準線からの距離を50ポイント測定し標準偏差(σ)を求め、その3倍値(3σ)をLERとして算出した。値が小さいほどラフネスが小さく均一なパターンエッジが得られ良好な性能である。
以上の結果から、本発明のひとつの態様における金属含有オニウム塩化合物を光崩壊性塩基として含むレジスト組成物は、リソグラフィにおける感度、解像性、焦点深度に優れ、且つ、微細パターンにおけるLWRを低減できる効果を有することがわかる。
Claims (9)
- 下記式(1)で示される金属含有オニウム塩化合物。
Ar1は、炭素数5~20のアリーレン基であり、前記アリーレン基の水素原子の一部又は全部は置換されていてもよい。
前記アルキル基は、少なくとも1つのメチレン基に代えてヘテロ原子含有基を含んでいても良く、前記アリール基及びアリーレン基は、環構造中に少なくとも1つの炭素原子に代えてヘテロ原子を含んでいても良い。
MはGe、Sn及びPbからなる群より選択されるいずれかである。
Yは、ヨウ素原子、硫黄原子、セレン原子及びテルル原子からなる群より選択されるいずれかであり、Yがヨウ素原子であるときnは1であり、Yが硫黄原子、セレン原子及びテルル原子のいずれかであるときnは2である。
Ar1及び2つのR2のうちいずれか2つ以上が互いに結合してこれらが結合しているYと共に環構造を形成していてもよく、該環構造中にヘテロ原子を含んでいてもよい。
X-はアニオンである。) - 前記Mが、Snである請求項1に記載のレジスト組成物。
- 請求項1~3のいずれか一項に記載の金属含有オニウム塩を含む光崩壊性塩基。
- 請求項4に記載の光崩壊性塩基を含有するレジスト組成物。
- 請求項4に記載の光崩壊性塩基と、光酸発生剤と、酸反応性化合物と、を含有するレジスト組成物。
- 前記酸反応性化合物が、酸により脱保護する保護基を有する化合物、酸により重合する重合性基を有する化合物、及び、酸により架橋作用を有する架橋剤からなる群より選択される少なくともいずれかである請求項5又は6に記載のレジスト組成物。
- 請求項5~7のいずれか一項に記載のレジスト組成物を用いて基板上にレジスト膜を形成する工程と、
前記レジスト膜を露光する工程と、
露光されたレジスト膜を現像してレジストパターンを得る工程と、を含むデバイスの製造方法。 - 前記レジスト膜の露光が、電子線又は極端紫外線を用いて行われる請求項8に記載の製造方法。
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