JP7411838B2 - レジスト組成物及びパターン形成方法 - Google Patents
レジスト組成物及びパターン形成方法 Download PDFInfo
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- JP7411838B2 JP7411838B2 JP2023023940A JP2023023940A JP7411838B2 JP 7411838 B2 JP7411838 B2 JP 7411838B2 JP 2023023940 A JP2023023940 A JP 2023023940A JP 2023023940 A JP2023023940 A JP 2023023940A JP 7411838 B2 JP7411838 B2 JP 7411838B2
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- NLAMRLZPVVKXTK-SNAWJCMRSA-N [(e)-but-1-enyl] acetate Chemical compound CC\C=C\OC(C)=O NLAMRLZPVVKXTK-SNAWJCMRSA-N 0.000 description 1
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 1
- 150000001241 acetals Chemical class 0.000 description 1
- IPBVNPXQWQGGJP-UHFFFAOYSA-N acetic acid phenyl ester Natural products CC(=O)OC1=CC=CC=C1 IPBVNPXQWQGGJP-UHFFFAOYSA-N 0.000 description 1
- 125000001539 acetonyl group Chemical group [H]C([H])([H])C(=O)C([H])([H])* 0.000 description 1
- 150000008065 acid anhydrides Chemical class 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 125000005074 adamantylmethyl group Chemical group 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 125000004414 alkyl thio group Chemical group 0.000 description 1
- 125000000304 alkynyl group Chemical group 0.000 description 1
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical class CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 1
- GSLDEZOOOSBFGP-UHFFFAOYSA-N alpha-methylene gamma-butyrolactone Chemical class C=C1CCOC1=O GSLDEZOOOSBFGP-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 125000005427 anthranyl group Chemical group 0.000 description 1
- 125000005428 anthryl group Chemical group [H]C1=C([H])C([H])=C2C([H])=C3C(*)=C([H])C([H])=C([H])C3=C([H])C2=C1[H] 0.000 description 1
- DULCUDSUACXJJC-UHFFFAOYSA-N benzeneacetic acid ethyl ester Natural products CCOC(=O)CC1=CC=CC=C1 DULCUDSUACXJJC-UHFFFAOYSA-N 0.000 description 1
- 229940007550 benzyl acetate Drugs 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000005380 borophosphosilicate glass Substances 0.000 description 1
- SXDBWCPKPHAZSM-UHFFFAOYSA-M bromate Inorganic materials [O-]Br(=O)=O SXDBWCPKPHAZSM-UHFFFAOYSA-M 0.000 description 1
- 235000019437 butane-1,3-diol Nutrition 0.000 description 1
- 239000001191 butyl (2R)-2-hydroxypropanoate Substances 0.000 description 1
- 229940043232 butyl acetate Drugs 0.000 description 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 150000001734 carboxylic acid salts Chemical class 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 229940005989 chlorate ion Drugs 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
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- 239000013078 crystal Substances 0.000 description 1
- 125000001995 cyclobutyl group Chemical group [H]C1([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 1
- CSYSRRCOBYEGPI-UHFFFAOYSA-N diazo(sulfonyl)methane Chemical compound [N-]=[N+]=C=S(=O)=O CSYSRRCOBYEGPI-UHFFFAOYSA-N 0.000 description 1
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 description 1
- ZWWQRMFIZFPUAA-UHFFFAOYSA-N dimethyl 2-methylidenebutanedioate Chemical compound COC(=O)CC(=C)C(=O)OC ZWWQRMFIZFPUAA-UHFFFAOYSA-N 0.000 description 1
- LDCRTTXIJACKKU-ARJAWSKDSA-N dimethyl maleate Chemical compound COC(=O)\C=C/C(=O)OC LDCRTTXIJACKKU-ARJAWSKDSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 229940069096 dodecene Drugs 0.000 description 1
- ODQWQRRAPPTVAG-GZTJUZNOSA-N doxepin Chemical compound C1OC2=CC=CC=C2C(=C/CCN(C)C)/C2=CC=CC=C21 ODQWQRRAPPTVAG-GZTJUZNOSA-N 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
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- 150000002170 ethers Chemical class 0.000 description 1
- GFUIDHWFLMPAGY-UHFFFAOYSA-N ethyl 2-hydroxy-2-methylpropanoate Chemical compound CCOC(=O)C(C)(C)O GFUIDHWFLMPAGY-UHFFFAOYSA-N 0.000 description 1
- BHXIWUJLHYHGSJ-UHFFFAOYSA-N ethyl 3-ethoxypropanoate Chemical compound CCOCCC(=O)OCC BHXIWUJLHYHGSJ-UHFFFAOYSA-N 0.000 description 1
- 229940117360 ethyl pyruvate Drugs 0.000 description 1
- 125000003709 fluoroalkyl group Chemical group 0.000 description 1
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- 229910052736 halogen Inorganic materials 0.000 description 1
- 125000001072 heteroaryl group Chemical group 0.000 description 1
- ARGGOKUVIPUXPJ-UHFFFAOYSA-N hexahydro-2h-3,5-methanocyclopenta[b]furan-2-one Chemical compound C1C2C3OC(=O)C2CC1C3 ARGGOKUVIPUXPJ-UHFFFAOYSA-N 0.000 description 1
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- AQYSYJUIMQTRMV-UHFFFAOYSA-N hypofluorous acid Chemical compound FO AQYSYJUIMQTRMV-UHFFFAOYSA-N 0.000 description 1
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- 239000004615 ingredient Substances 0.000 description 1
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- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
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- 125000000555 isopropenyl group Chemical group [H]\C([H])=C(\*)C([H])([H])[H] 0.000 description 1
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- LGRLWUINFJPLSH-UHFFFAOYSA-N methanide Chemical compound [CH3-] LGRLWUINFJPLSH-UHFFFAOYSA-N 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- BDJSOPWXYLFTNW-UHFFFAOYSA-N methyl 3-methoxypropanoate Chemical compound COCCC(=O)OC BDJSOPWXYLFTNW-UHFFFAOYSA-N 0.000 description 1
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- MBAHGFJTIVZLFB-UHFFFAOYSA-N methyl pent-2-enoate Chemical compound CCC=CC(=O)OC MBAHGFJTIVZLFB-UHFFFAOYSA-N 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 125000001421 myristyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- 125000003136 n-heptyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
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- 229940005654 nitrite ion Drugs 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
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- AHHWIHXENZJRFG-UHFFFAOYSA-N oxetane Chemical compound C1COC1 AHHWIHXENZJRFG-UHFFFAOYSA-N 0.000 description 1
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- 125000005740 oxycarbonyl group Chemical group [*:1]OC([*:2])=O 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 125000002958 pentadecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- GXOHBWLPQHTYPF-UHFFFAOYSA-N pentyl 2-hydroxypropanoate Chemical compound CCCCCOC(=O)C(C)O GXOHBWLPQHTYPF-UHFFFAOYSA-N 0.000 description 1
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- 238000002360 preparation method Methods 0.000 description 1
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- 230000002250 progressing effect Effects 0.000 description 1
- ILVGAIQLOCKNQA-UHFFFAOYSA-N propyl 2-hydroxypropanoate Chemical compound CCCOC(=O)C(C)O ILVGAIQLOCKNQA-UHFFFAOYSA-N 0.000 description 1
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- 230000007261 regionalization Effects 0.000 description 1
- 238000007151 ring opening polymerisation reaction Methods 0.000 description 1
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- 150000003839 salts Chemical class 0.000 description 1
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- 238000004528 spin coating Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 125000004213 tert-butoxy group Chemical group [H]C([H])([H])C(O*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- WMOVHXAZOJBABW-UHFFFAOYSA-N tert-butyl acetate Chemical compound CC(=O)OC(C)(C)C WMOVHXAZOJBABW-UHFFFAOYSA-N 0.000 description 1
- JAELLLITIZHOGQ-UHFFFAOYSA-N tert-butyl propanoate Chemical compound CCC(=O)OC(C)(C)C JAELLLITIZHOGQ-UHFFFAOYSA-N 0.000 description 1
- 125000005931 tert-butyloxycarbonyl group Chemical group [H]C([H])([H])C(OC(*)=O)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000004192 tetrahydrofuran-2-yl group Chemical group [H]C1([H])OC([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- 125000004187 tetrahydropyran-2-yl group Chemical group [H]C1([H])OC([H])(*)C([H])([H])C([H])([H])C1([H])[H] 0.000 description 1
- QEMXHQIAXOOASZ-UHFFFAOYSA-N tetramethylammonium Chemical compound C[N+](C)(C)C QEMXHQIAXOOASZ-UHFFFAOYSA-N 0.000 description 1
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- 125000003944 tolyl group Chemical group 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 125000002889 tridecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000004205 trifluoroethyl group Chemical group [H]C([H])(*)C(F)(F)F 0.000 description 1
- QXJQHYBHAIHNGG-UHFFFAOYSA-N trimethylolethane Chemical compound OCC(C)(CO)CO QXJQHYBHAIHNGG-UHFFFAOYSA-N 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- 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
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- 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
- G03F7/0045—Photosensitive materials with organic non-macromolecular light-sensitive compounds not otherwise provided for, e.g. dissolution inhibitors
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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
- G03F7/004—Photosensitive materials
- G03F7/0048—Photosensitive materials characterised by the solvents or agents facilitating spreading, e.g. tensio-active agents
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- G—PHYSICS
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- 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
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- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
- G03F7/2004—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image characterised by the use of a particular light source, e.g. fluorescent lamps or deep UV light
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- 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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- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70008—Production of exposure light, i.e. light sources
- G03F7/70025—Production of exposure light, i.e. light sources by lasers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Materials For Photolithography (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Description
また、前記露光が、屈折率1.0以上の液体をレジスト膜と投影レンズとの間に介在させて行う液浸露光であることや、前記レジスト膜の上に更に保護膜を形成し、該保護膜と投影レンズとの間に前記液体を介在させて液浸露光を行うことでパターン形成することもできる。
本発明は、特にKrFエキシマレーザー光、電子線、極端紫外線等の高エネルギー線を光源としたフォトリソグラフィーにおいて、良好なマスク寸法依存性(マスクエラーファクター:MEF)、寸法均一性(CDU)を示すレジスト組成物及びパターン形成方法を提供することができる。
本発明のレジスト組成物は、(A)酸不安定基を有する繰り返し単位を含み、さらに芳香族置換基を有する繰り返し単位を少なくとも1種含む樹脂(ベース樹脂)、(B)一般式(B-1)で表される光酸発生剤、及び(C)溶剤を含む。更に、必要に応じて、(D)成分としての(A)成分の樹脂とは異なる特定のフッ素含有樹脂や、クエンチャー、界面活性剤などその他の成分を含んでもよい。以下、各成分について説明する。
本発明のレジスト組成物において、(A)成分のベース樹脂(樹脂A)は、酸不安定基を有する繰り返し単位を含み、芳香族置換基を有する繰り返し単位を少なくとも1種含む樹脂である。
RL24はこれが結合する炭素原子と共に置換又は非置換のシクロペンタン環、シクロヘキサン環、又はノルボルナン環を形成する2価の基を示す。RL22、RL23はそれぞれ独立に水素原子又は炭素数1~10の直鎖状、分岐状又は環状の1価の炭化水素基を示す。RL22とRL23は互いに結合してこれらが結合する炭素原子と共に環を形成してもよく、その場合、置換又は非置換のシクロペンタン環、又はシクロヘキサン環を形成する2価の基を示す。pは1又は2を示す。
RL28はこれが結合する炭素原子と共に置換又は非置換のシクロペンタン環、シクロヘキサン環、又はノルボルナン環を形成する2価の基を示す。RL26、RL27はそれぞれ独立に水素原子又は炭素数1~10の直鎖状、分岐状又は環状の1価の炭化水素基を示す。RL26とRL27は互いに結合してこれらが結合する炭素原子と共に環を形成してもよく、その場合、置換又は非置換のシクロペンタン環、又はシクロヘキサン環を形成する2価の基を示す。qは1又は2を示す。
RL32はこれが結合する炭素原子と共に置換又は非置換のシクロペンタン環、シクロヘキサン環、又はノルボルナン環を形成する2価の基を示す。RL30、RL31はそれぞれ独立に水素原子又は炭素数1~10の直鎖状、分岐状又は環状の1価の炭化水素基を示す。RL30とRL31は互いに結合してこれらが結合する炭素原子と共に環を形成してもよく、その場合、置換又は非置換のシクロペンタン環、又はシクロヘキサン環を形成する2価の基を示す。
(II)式(A-1)で表される繰り返し単位を、好ましくは1~70モル%、より好ましくは5~60モル%、より好ましくは10~60モル%含み、
(III)式(A-2)~(A-4)で表される繰り返し単位から選ばれる少なくとも1種を、好ましくは1~40モル%、より好ましくは3~35モル%、より好ましくは5~30モル%含み、
(IV)式(a2)~(a4)で表される繰り返し単位から選ばれる少なくとも1種を、好ましくは0~99モル%、より好ましくは0~90モル%、更に好ましくは0~70モル%含み、
(V)その他の繰り返し単位を、好ましくは0~99モル%、より好ましくは0~70モル%、更に好ましくは0~50モル%含むことができる。
本発明のレジスト組成物は、(B)成分として下記式(B-1)で表される光酸発生剤を含む。
本発明のレジスト組成物は、(C)成分として溶剤を含有する。前記溶剤としては、特開2008-111103号公報の段落[0144]~[0145]に記載の、シクロヘキサノン、メチル-2-n-ペンチルケトン等のケトン類、3-メトキシブタノール、3-メチル-3-メトキシブタノール、1-メトキシ-2-プロパノール、1-エトキシ-2-プロパノール等のアルコール類、プロピ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、エチ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ジメチルエーテル、ジエチレングリコールジメチルエーテル等のエーテル類、PGMEA、プロピレングリコールモノエチルエーテルアセテート、乳酸エチル、ピルビン酸エチル、酢酸ブチル、3-メトキシプロピオン酸メチル、3-エトキシプロピオン酸エチル、酢酸tert-ブチル、プロピオン酸tert-ブチル、プロピレングリコールモノtert-ブチルエーテルアセテート等のエステル類、γ-ブチロラクトン等のラクトン類及び、ジアセトンアルコール等のアルコール類、その混合溶剤が挙げられる。アセタール系の酸不安定基を用いる場合は、アセタールの脱保護反応を加速させるために高沸点のアルコール系溶剤、具体的にはジエチレングリコール、プロピレングリコール、グリセリン、1,4-ブタンジオール、1,3-ブタンジオール等を加えることもできる。
本発明のレジスト組成物は、前記樹脂Aとは異なる樹脂であって、下記式(D-1)、(D-2)及び(D-3)で表される繰り返し単位から選ばれる少なくとも1種を含むフッ素含有樹脂を含んでもよい。
本発明のレジスト組成物は、必要に応じて、クエンチャーとしてアミン化合物、スルホン酸塩又はカルボン酸塩を含んでもよい。本明細書においてクエンチャーとは、光酸発生剤より発生する酸がレジスト膜中に拡散する際に、拡散速度を抑制することができる化合物を意味する。
本発明のレジスト組成物は、水に不溶又は難溶でアルカリ現像液に可溶な界面活性剤、及び/又は水及びアルカリ現像液に不溶又は難溶な界面活性剤成分を含んでもよい。このような界面活性剤としては、特開2010-215608号公報や特開2011-16746号公報に記載の(S)定義成分を参照することができる。
本発明は、更に、前述したレジスト組成物を用いたパターン形成方法を提供する。本発明のレジスト組成物を使用してパターンを形成するには、公知のリソグラフィー技術を採用して行うことができる。具体的には、例えば、集積回路製造用の基板(Si、SiO2、SiN、SiON、TiN、WSi、BPSG、SOG、有機反射防止膜等)、あるいはマスク回路製造用の基板(Cr、CrO、CrON、MoSi2、SiO2等)に、スピンコーティング等の手法で膜厚が0.05~2μmとなるように本発明のレジスト組成物を塗布し、これをホットプレート上で好ましくは60~150℃、1~10分間、より好ましくは80~140℃、1~5分間プリベークし、レジスト膜を形成する。
[実施例1-1]
IR(D-ATR):ν=3087, 3002, 2906, 2852, 1785, 1727, 1477, 1448, 1344, 1240, 1180, 1103, 1076, 1035, 110, 997, 943, 750, 684, 642, 551, 522, 501 cm-1
IR(D-ATR):ν=3089, 2907, 2853, 1785, 1729, 1476, 1449, 1344, 1237, 1180, 1104, 1076, 1035, 1010, 947, 761, 707, 681, 642, 585, 551, 525 cm-1
対応する原料を用い、公知の有機合成方法でPAG-3~PAG-9を合成した。
本発明のレジスト組成物に用いるポリマーを以下に示す方法で合成した。なお、得られたポリマーのMwは、溶剤としてTHFあるいはDMFを用いたGPCによりポリスチレン換算値として測定した。
[実施例2-1~2-40、比較例1-1~1-38]
本発明のオニウム塩(PAG-1~PAG-9)、比較用光酸発生剤PAG-A~PAG-H、レジストポリマー1~7、その他の光酸発生剤PAG-X~PAG-Z、クエンチャーQ-1~Q-4、及びアルカリ可溶型界面活性剤SF-1を、下記表1及び2に示す組成で、界面活性剤A(オムノバ社製)0.01質量%を含む溶剤中に溶解して溶液を調製し、該溶液を0.2μmのテフロン(登録商標)製フィルターで濾過することにより、レジスト組成物を調製した。
S-1:PGMEA(プロピレングリコールモノメチルエーテルアセテート)
S-2:GBL(γ-ブチロラクトン)
3-メチル-3-(2,2,2-トリフルオロエトキシメチル)オキセタン・テトラヒドロフラン・2,2-ジメチル-1,3-プロパンジオール共重合物(オムノバ社製)
Mw=1,500
[実施例3-1~3-40、比較例2-1~2-38]
本発明のレジスト組成物(R-1~R-40)及び比較用のレジスト組成物(R-41~R-78)を、東京エレクトロン製のクリーントラックLithius ProZを用いてBRUWER SCIENCE社製の20nmの膜厚の有機反射防止膜AL-412が成膜された基板上にコーティングし、ホットプレート上に105℃で60秒間ベークし、50nmのレジスト膜を形成した。ASML社製のEUV露光機NXE3300を用いて、マスク上の寸法がピッチ46nmで27.5nmの格子パターンを露光し、露光後レジスト組成物毎に適したPEB温度を施した後、2.38%のテトラメチルアンモニウム水溶液をウェハを回転させながら吐出させ、合計30秒間現像させ、水でアルカリ溶液を洗い流し、ウェハを高速度で回転させ水を除去した。
作成したレジストパターンを日立ハイテクノロジーズ製のCD-SEM CG-5000で観察し、ピッチ46nmにおいてホール径23nmとなる露光量を最適露光量Eop(mJ/cm2)とした。
マスク上の寸法がピッチ46nmで格子パターンが27.5nmのときCD-SEMで観察したとき23nm付近のホール径が観察されるとき、マスク上の寸法がピッチ46nmで格子パターンが26.0nm、26.5nm、27.0nm、27.5nm、28.0nm、28.5nm、29.0nmのときのホールパターンのCDを測定する。マスク上の寸法とその観察CDとの傾きをMEF(Mask Error Enhancement Factor)とした。概ね3.0以下をMEFが良好とする。
得られたホールパターンを日立ハイテクノロジーズ製のCD-SEM CG-5000で観察し、1サンプルにつき1つのホールでホール径を32点測長し、1枚のSEM画像から49のホールを測長し、その結果から算出した標準偏差(σ)の3倍値(3σ)を求め、30枚のSEM像を取得し、標準偏差の平均値をCDUとした。CDUは、その値が小さいほど、寸法均一性が優れることを意味する。概ね3.2以下をCDUが良好とする。
Claims (11)
- (A)酸不安定基を有する繰り返し単位を含み、さらに芳香族置換基を有する繰り返し単位を少なくとも1種含む樹脂(但し、下記一般式(i)及び(ii)で表される繰り返し単位を含む樹脂を除く)、
(B)一般式(B-1)で表される光酸発生剤、及び(C)溶剤を含むものであることを特徴とするレジスト組成物(ただし、下記式で表されるポリマーX又はポリマーYと、下記式(B-1X)で表される光酸発生剤とを含むレジスト組成物を除く)。
- 前記一般式(B-1)中のW1が、炭素数6~12のラクトン環構造を含む環状の2価炭化水素基であることを特徴とする請求項1に記載のレジスト組成物。
- 前記一般式(B-1)中のW2が、炭素数7~14のヘテロ原子を含まない多環状の1価炭化水素基であることを特徴とする請求項1又は請求項2に記載のレジスト組成物。
- 前記(A)成分の樹脂中、前記芳香族置換基を有する繰り返し単位の1種が、下記一般式(A-2)~(A-4)で表される繰り返し単位であることを特徴とする請求項1から請求項5のいずれか1項に記載のレジスト組成物。
- 請求項1から請求項6のいずれか1項に記載のレジスト組成物を基板上に塗布し、加熱処理をしてレジスト膜を形成する工程と、前記レジスト膜を高エネルギー線で露光する工程と、現像液を用いて露光したレジスト膜を現像する工程とを含むことを特徴とするパターン形成方法。
- 前記高エネルギー線が、波長193nmのArFエキシマレーザー又は波長248nmのKrFエキシマレーザーであることを特徴とする請求項7に記載のパターン形成方法。
- 前記露光が、屈折率1.0以上の液体をレジスト膜と投影レンズとの間に介在させて行う液浸露光であることを特徴とする請求項7又は請求項8に記載のパターン形成方法。
- 前記レジスト膜の上に更に保護膜を形成し、該保護膜と投影レンズとの間に前記液体を介在させて液浸露光を行うことを特徴とする請求項9に記載のパターン形成方法。
- 前記高エネルギー線が、電子線又は波長3~15nmの極端紫外線であることを特徴とする請求項7に記載のパターン形成方法。
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