JP7303495B2 - 光架橋基を有するポリエーテル樹脂を含む段差基板被覆組成物 - Google Patents
光架橋基を有するポリエーテル樹脂を含む段差基板被覆組成物 Download PDFInfo
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- JP7303495B2 JP7303495B2 JP2019511211A JP2019511211A JP7303495B2 JP 7303495 B2 JP7303495 B2 JP 7303495B2 JP 2019511211 A JP2019511211 A JP 2019511211A JP 2019511211 A JP2019511211 A JP 2019511211A JP 7303495 B2 JP7303495 B2 JP 7303495B2
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- 239000000758 substrate Substances 0.000 title claims description 114
- 239000008199 coating composition Substances 0.000 title claims description 43
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- 229920000570 polyether Polymers 0.000 title 1
- 125000004432 carbon atom Chemical group C* 0.000 claims description 72
- 229920000642 polymer Polymers 0.000 claims description 40
- 238000000576 coating method Methods 0.000 claims description 33
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- 239000011248 coating agent Substances 0.000 claims description 32
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- 125000000217 alkyl group Chemical group 0.000 claims description 20
- 125000003118 aryl group Chemical group 0.000 claims description 20
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- 125000005842 heteroatom Chemical group 0.000 claims description 12
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- 238000001459 lithography Methods 0.000 claims description 9
- 125000004430 oxygen atom Chemical group O* 0.000 claims description 9
- 238000011161 development Methods 0.000 claims description 8
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 8
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 8
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- LJBWJFWNFUKAGS-UHFFFAOYSA-N 2-[bis(2-hydroxyphenyl)methyl]phenol Chemical compound OC1=CC=CC=C1C(C=1C(=CC=CC=1)O)C1=CC=CC=C1O LJBWJFWNFUKAGS-UHFFFAOYSA-N 0.000 claims description 4
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- RFGXKWPGHBQLQB-UHFFFAOYSA-N 2-[tris(2-hydroxyphenyl)methyl]phenol Chemical compound OC1=CC=CC=C1C(C=1C(=CC=CC=1)O)(C=1C(=CC=CC=1)O)C1=CC=CC=C1O RFGXKWPGHBQLQB-UHFFFAOYSA-N 0.000 claims 1
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- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical group C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 6
- XPFVYQJUAUNWIW-UHFFFAOYSA-N furfuryl alcohol Chemical compound OCC1=CC=CO1 XPFVYQJUAUNWIW-UHFFFAOYSA-N 0.000 description 6
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- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 description 5
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- 125000004450 alkenylene group Chemical group 0.000 description 5
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- JHYNXXDQQHTCHJ-UHFFFAOYSA-M ethyl(triphenyl)phosphanium;bromide Chemical compound [Br-].C=1C=CC=CC=1[P+](C=1C=CC=CC=1)(CC)C1=CC=CC=C1 JHYNXXDQQHTCHJ-UHFFFAOYSA-M 0.000 description 5
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- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 5
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical compound CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 description 4
- XLLIQLLCWZCATF-UHFFFAOYSA-N 2-methoxyethyl acetate Chemical compound COCCOC(C)=O XLLIQLLCWZCATF-UHFFFAOYSA-N 0.000 description 4
- SVTBMSDMJJWYQN-UHFFFAOYSA-N 2-methylpentane-2,4-diol Chemical compound CC(O)CC(C)(C)O SVTBMSDMJJWYQN-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 4
- 125000003545 alkoxy group Chemical group 0.000 description 4
- 125000004448 alkyl carbonyl group Chemical group 0.000 description 4
- 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 4
- 125000000609 carbazolyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3NC12)* 0.000 description 4
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Chemical compound CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 description 4
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- 230000007935 neutral effect Effects 0.000 description 4
- 239000003505 polymerization initiator Substances 0.000 description 4
- YPFDHNVEDLHUCE-UHFFFAOYSA-N propane-1,3-diol Chemical compound OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 description 4
- 238000001226 reprecipitation Methods 0.000 description 4
- 125000006836 terphenylene group Chemical group 0.000 description 4
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 description 4
- HKCNCNXZAZPKDZ-UHFFFAOYSA-N (4,4-difluorocyclohexa-1,5-dien-1-yl)-phenylmethanone Chemical compound C1=CC(F)(F)CC=C1C(=O)C1=CC=CC=C1 HKCNCNXZAZPKDZ-UHFFFAOYSA-N 0.000 description 3
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- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
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- MSXVEPNJUHWQHW-UHFFFAOYSA-N 2-methylbutan-2-ol Chemical compound CCC(C)(C)O MSXVEPNJUHWQHW-UHFFFAOYSA-N 0.000 description 3
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- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
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- STMDPCBYJCIZOD-UHFFFAOYSA-N 2-(2,4-dinitroanilino)-4-methylpentanoic acid Chemical compound CC(C)CC(C(O)=O)NC1=CC=C([N+]([O-])=O)C=C1[N+]([O-])=O STMDPCBYJCIZOD-UHFFFAOYSA-N 0.000 description 2
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- 239000004971 Cross linker Substances 0.000 description 2
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
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- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 2
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- BHELZAPQIKSEDF-UHFFFAOYSA-N allyl bromide Chemical compound BrCC=C BHELZAPQIKSEDF-UHFFFAOYSA-N 0.000 description 2
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- 230000008033 biological extinction Effects 0.000 description 2
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- 239000001191 butyl (2R)-2-hydroxypropanoate Substances 0.000 description 2
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- NMJJFJNHVMGPGM-UHFFFAOYSA-N butyl formate Chemical compound CCCCOC=O NMJJFJNHVMGPGM-UHFFFAOYSA-N 0.000 description 2
- 150000001721 carbon Chemical group 0.000 description 2
- 125000006297 carbonyl amino group Chemical group [H]N([*:2])C([*:1])=O 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- OEYIOHPDSNJKLS-UHFFFAOYSA-N choline Chemical compound C[N+](C)(C)CCO OEYIOHPDSNJKLS-UHFFFAOYSA-N 0.000 description 2
- 229960001231 choline Drugs 0.000 description 2
- 125000004093 cyano group Chemical group *C#N 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- BGTOWKSIORTVQH-UHFFFAOYSA-N cyclopentanone Chemical compound O=C1CCCC1 BGTOWKSIORTVQH-UHFFFAOYSA-N 0.000 description 2
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- 238000013461 design Methods 0.000 description 2
- JQVDAXLFBXTEQA-UHFFFAOYSA-N dibutylamine Chemical compound CCCCNCCCC JQVDAXLFBXTEQA-UHFFFAOYSA-N 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- CKSRFHWWBKRUKA-UHFFFAOYSA-N ethyl 2-ethoxyacetate Chemical compound CCOCC(=O)OCC CKSRFHWWBKRUKA-UHFFFAOYSA-N 0.000 description 2
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- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 description 2
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- 239000000194 fatty acid Substances 0.000 description 2
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- HSDFKDZBJMDHFF-UHFFFAOYSA-N methyl 3-ethoxypropanoate Chemical compound CCOCCC(=O)OC HSDFKDZBJMDHFF-UHFFFAOYSA-N 0.000 description 1
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- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 125000001844 prenyl group Chemical group [H]C([*])([H])C([H])=C(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
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- ILPVOWZUBFRIAX-UHFFFAOYSA-N propyl 2-oxopropanoate Chemical compound CCCOC(=O)C(C)=O ILPVOWZUBFRIAX-UHFFFAOYSA-N 0.000 description 1
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- 229940116423 propylene glycol diacetate Drugs 0.000 description 1
- ZDYVRSLAEXCVBX-UHFFFAOYSA-N pyridinium p-toluenesulfonate Chemical compound C1=CC=[NH+]C=C1.CC1=CC=C(S([O-])(=O)=O)C=C1 ZDYVRSLAEXCVBX-UHFFFAOYSA-N 0.000 description 1
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- 235000012239 silicon dioxide Nutrition 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
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- 239000001587 sorbitan monostearate Substances 0.000 description 1
- 235000011076 sorbitan monostearate Nutrition 0.000 description 1
- 229940035048 sorbitan monostearate Drugs 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
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- 229940073455 tetraethylammonium hydroxide Drugs 0.000 description 1
- LRGJRHZIDJQFCL-UHFFFAOYSA-M tetraethylazanium;hydroxide Chemical compound [OH-].CC[N+](CC)(CC)CC LRGJRHZIDJQFCL-UHFFFAOYSA-M 0.000 description 1
- 238000002411 thermogravimetry Methods 0.000 description 1
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- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical compound OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 description 1
- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 description 1
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 1
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- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- G03F7/11—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having cover layers or intermediate layers, e.g. subbing layers
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/08—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated side groups
- C08F290/14—Polymers provided for in subclass C08G
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/34—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/34—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives
- C08G65/38—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives derived from phenols
- C08G65/40—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives derived from phenols from phenols (I) and other compounds (II), e.g. OH-Ar-OH + X-Ar-X, where X is halogen atom, i.e. leaving group
- C08G65/4012—Other compound (II) containing a ketone group, e.g. X-Ar-C(=O)-Ar-X for polyetherketones
- C08G65/4043—(I) or (II) containing oxygen other than as phenol or carbonyl group
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D171/00—Coating compositions based on polyethers obtained by reactions forming an ether link in the main chain; Coating compositions based on derivatives of such polymers
- C09D171/08—Polyethers derived from hydroxy compounds or from their metallic derivatives
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- G03F7/004—Photosensitive materials
- G03F7/038—Macromolecular compounds which are rendered insoluble or differentially wettable
- G03F7/0388—Macromolecular compounds which are rendered insoluble or differentially wettable with ethylenic or acetylenic bands in the side chains of the photopolymer
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- 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
- G03F7/2012—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 using liquid photohardening compositions, e.g. for the production of reliefs such as flexographic plates or stamps
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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
- G03F7/2037—Exposure with X-ray radiation or corpuscular radiation, through a mask with a pattern opaque to that radiation
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- G03F7/26—Processing photosensitive materials; Apparatus therefor
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/033—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers
- H01L21/0332—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their composition, e.g. multilayer masks, materials
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
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Description
ところが、露光波長の短波長化に伴って焦点深度が低下するために、基板上に形成された被膜の平坦化性を向上させることが必要になる。微細なデザインルールを持つ半導体装置を製造するためには、基板上の平坦化技術が重要になってきている。
平坦化膜、例えばレジストの下に形成されるレジスト下層膜を光硬化により形成する方法が開示されている。
但し、R1において、酸素原子、カルボニル基、イオウ原子、-C(O)-O-、-C(O)-NRa-及び-NRb-は、それら同士で結合しない。
ここで、多核フェノールが有するヒドロキシル基の数とは、m×qを意図する。
式(1)中でXはカルボニル基である場合を好ましく用いることができる。
また、式(1)中のn1は1又は2であり、n2とn3が0であるポリマーを用いることができる。
上記段差基板被覆組成物は必要に応じて界面活性剤等の添加剤を含むことができる。
本発明に用いられる上記ポリマーは、平均分子量が600乃至1000000、又は600乃至200000、又は1500乃至15000である。
上記ポリマーは、分子間又は分子内で炭素と炭素の不飽和結合の光反応で架橋構造を形成することができるが、この炭素原子間の不飽和結合、即ち炭素原子間の不飽和二重結合を分子内に少なくとも1個有することができ、また分子内に複数個(例えば1乃至1000個)有することもできる。
式(3)中、A4及びA5はそれぞれヘテロ原子を含んでいてもよい炭素原子数6乃至48の芳香族環又はヘテロ原子を含んでいてもよい炭素原子数6乃至48の芳香族環を含む炭化水素基を示し、B4及びB5は上記式(2)と同一であり、n4は1≦n4≦4、n5は0≦n5≦4の整数であり、n4+n5=1乃至8の整数である。ヘテロ原子として、窒素原子、酸素原子があげられる。炭素原子数6乃至48の芳香族環は例えば、ベンゼン環、ビフェニル環、ターフェニレン環、フルオレン環、ナフタレン環、アントリル環、ピレン環、カルバゾール環、インドール環があげられる。
ポリマーが式(1)の単位構造と式(3)の単位構造を含む場合に、式(1)の単位構造:式(3)の単位構造はモル比で、1:0.1乃至1:10、又は1:0.5乃至1:5、又は1:1の割合で含有することができる。
上記基板はオープンエリア(非パターンエリア)と、DENCE(密)及びISO(粗)のパターンエリアを有し、パターンのアスペクト比が0.1乃至10を用いることができる。
本発明でリソグラフィー用レジスト下層膜材料を使用して形成したレジスト下層膜を有するレジストの現像液としては、水酸化ナトリウム、水酸化カリウム、炭酸ナトリウム、ケイ酸ナトリウム、メタケイ酸ナトリウム、アンモニア水等の無機アルカリ類、エチルアミン、n-プロピルアミン等の第一アミン類、ジエチルアミン、ジーn-ブチルアミン等の第二アミン類、トリエチルアミン、メチルジエチルアミン等の第三アミン類、ジメチルエタノールアミン、トリエタノールアミン等のアルコールアミン類、テトラメチルアンモニウムヒドロキシド、テトラエチルアンモニウムヒドロキシド、コリン等の第4級アンモニウム塩、ピロール、ピペリジン等の環状アミン類、等のアルカリ類の水溶液を使用することができる。さらに、上記アルカリ類の水溶液にイソプロピルアルコール等のアルコール類、ノニオン系等の界面活性剤を適当量添加して使用することもできる。これらの中で好ましい現像液は第四級アンモニウム塩、さらに好ましくはテトラメチルアンモニウムヒドロキシド及びコリンである。
三口フラスコに1,1,1-トリス(4-ヒドロキシフェニル)エタン(東京化成工業株式会社製)50.0g、4,4-ジフルオロベンゾフェノン(東京化成工業株式会社製製)35.6g、炭酸カリウム(和光純薬工業株式会社製)31.37g、N-メチルピロリドン(関東化学株式会社製)272.9gを入れた。その後150℃まで加熱し、約2.5時間撹拌した。反応終了後、N-メチルピロリドン180.8gで希釈し、濾過により炭酸カリウムを取り除いた。得られたろ液に対して1N-HClを加えて中性とした後、しばらく撹拌した。この希釈溶液をメタノール/水=90/10(vol/vol)溶液中に滴下し、再沈殿させた。得られた沈殿物を吸引ろ過後、ろ物を60℃で一晩減圧乾燥した。そして、樹脂1を54.8g得た。得られたポリマーは式(2-1)に相当した。GPCによりポリスチレン換算で測定される重量平均分子量Mwは2,900であった。
三口フラスコにTEP-DF(旭有機材株式会社製)30.0g、4,4-ジフルオロベンゾフェノン(東京化成工業株式会社製製)16.43g、炭酸カリウム(和光純薬工業株式会社製)14.47g、N-メチルピロリドン(関東化学株式会社製)142.1gを入れた。その後150℃まで加熱し、約4時間撹拌した。反応終了後、N-メチルピロリドン261.1gで希釈し、濾過により炭酸カリウムを取り除いた。得られたろ液に対して1N-HClを加えて中性とした後、しばらく撹拌した。この希釈溶液をメタノール/水=90/10(vol/vol)溶液中に滴下し、再沈殿させた。得られた沈殿物を吸引ろ過後、ろ物を60℃で一晩減圧乾燥した。そして、樹脂2を29.1g得た。得られたポリマーは式(2-2)に相当した。GPCによりポリスチレン換算で測定される重量平均分子量Mwは2,900であった。
三口フラスコにTEP-TPA(旭有機材株式会社製)30.0g、4,4-ジフルオロベンゾフェノン(東京化成工業株式会社製製)13.81g、炭酸カリウム(和光純薬工業株式会社製)12.16g、N-メチルピロリドン(関東化学株式会社製)130.61gを入れた。その後150℃まで加熱し、約4時間撹拌した。反応終了後、N-メチルピロリドン252.3gで希釈し、濾過により炭酸カリウムを取り除いた。得られたろ液に対して1N-HClを加えて中性とした後、しばらく撹拌した。この希釈溶液をメタノール/水=90/10(vol/vol)溶液中に滴下し、再沈殿させた。得られた沈殿物を吸引ろ過後、ろ物を60℃で一晩減圧乾燥した。そして、樹脂3を18.6g得た。得られたポリマーは式(2-3)に相当した。GPCによりポリスチレン換算で測定される重量平均分子量Mwは3,400であった。
ナスフラスコに樹脂1を5.00g、アリルグリシジルエーテル(東京化成工業株式会社製)3.54g、ヒドロキノン(東京化成工業株式会社製)0.02g、エチルトリフェニルホスホニウムブロマイド(北興化学工業株式会社製)0.58g、N-メチルピロリドン(関東化学株式会社製)9.17g、プロピレングリコールモノメチルエーテルアセテート 21.4gを入れた。その後100℃まで加熱し、約24時間撹拌した。
反応終了後、N-メチルピロリドン5.96gで希釈し、メタノール/水=90/10(vol/vol)溶液中に滴下することで、再沈殿させた。得られた沈殿物を吸引ろ過後、ろ物を60℃で一晩減圧乾燥した。そして樹脂2を3.37g得た。得られたポリマーは式(1-4-1)に相当した。GPCによりポリスチレン換算で測定される重量平均分子量Mwは3,700であった。
ナスフラスコに樹脂1を5.00g、メタクリル酸グリシジル(東京化成工業株式会社製)7.34g、ヒドロキノン(東京化成工業株式会社製)0.03g、エチルトリフェニルホスホニウムブロマイド(北興化学工業株式会社製)0.96g、N-メチルピロリドン(関東化学株式会社製)9.33g、プロピレングリコールモノメチルエーテルアセテート 21.8gを入れた。その後100℃まで加熱し、約18時間撹拌した。
反応終了後、N-メチルピロリドン22.2gで希釈し、メタノール/水=90/10(vol/vol)溶液中に滴下することで、再沈殿させた。得られた沈殿物を吸引ろ過後、ろ物を60℃で一晩減圧乾燥した。そして、樹脂3を4.85g得た。得られたポリマーは式(1-4-2)に相当した。GPCによりポリスチレン換算で測定される重量平均分子量Mwは3,900であった。
ナスフラスコに樹脂1を5.00g、アリルブロミド(東京化成工業株式会社製)5.00g、炭酸カリウム(和光純薬工業株式会社製)3.97g、N-メチルピロリドン(関東化学株式会社製)20.59gを入れた。その後100℃まで加熱し、約24時間撹拌した。
反応終了後、N-メチルピロリドン15.1gで希釈し、濾過により炭酸カリウムを取り除いた。得られたろ液に対して1N-HClを加えて中性とした後、しばらく撹拌した。この希釈溶液をメタノール/水=90/10(vol/vol)溶液中に滴下し、再沈殿させた。得られた沈殿物を吸引ろ過後、ろ物を60℃で一晩減圧乾燥した。そして、樹脂4を4.00g得た。得られたポリマーは式(1-4-3)に相当した。GPCによりポリスチレン換算で測定される重量平均分子量Mwは3,100であった。
ナスフラスコに樹脂2を10.00g、メタクリル酸グリシジル(東京化成工業株式会社製)12.68g、ヒドロキノン(東京化成工業株式会社製)0.05g、エチルトリフェニルホスホニウムブロマイド(北興化学工業株式会社製)1.16g、N-メチルピロリドン(関東化学株式会社製)17.07g、プロピレングリコールモノメチルエーテルアセテート 39.84gを入れた。その後100℃まで加熱し、約12時間撹拌した。
反応終了後、N-メチルピロリドン40.0gで希釈し、メタノール溶液中に滴下することで、再沈殿させた。得られた沈殿物を吸引ろ過後、ろ物を60℃で一晩減圧乾燥した。そして、樹脂5を15.02g得た。得られたポリマーは式(1-4-11)に相当した。GPCによりポリスチレン換算で測定される重量平均分子量Mwは7,400であった。
ナスフラスコに樹脂3を10.00g、メタクリル酸グリシジル(東京化成工業株式会社製)11.24g、ヒドロキノン(東京化成工業株式会社製)0.04g、エチルトリフェニルホスホニウムブロマイド(北興化学工業株式会社製)1.47g、N-メチルピロリドン(関東化学株式会社製)15.93g、プロピレングリコールモノメチルエーテルアセテート 37.16gを入れた。その後100℃まで加熱し、約12時間撹拌した。
反応終了後、N-メチルピロリドン37.6gで希釈し、メタノール溶液中に滴下することで、再沈殿させた。得られた沈殿物を吸引ろ過後、ろ物を60℃で一晩減圧乾燥した。そして、樹脂6を13.12g得た。得られたポリマーは式(1-4-12)に相当した。GPCによりポリスチレン換算で測定される重量平均分子量Mwは5,200であった。
上記樹脂1を比較合成例1の樹脂として準備した。
エポキシ基含有ベンゼン縮合環式化合物(商品名:EPICLON HP-4700、エポキシ価:165g/eq.、DIC(株)製)10.00g、アクリル酸4.37g、エチルトリフェニルホスホニウムブロマイド0.56g、ヒドロキノン0.03gにプロピレングリコールモノメチルエーテル34.91gを加え、窒素雰囲気下、100℃で21時間加熱撹拌した。得られた溶液に陽イオン交換樹脂(製品名:ダウエックス〔登録商標〕550A、ムロマチテクノス(株))15g、陰イオン交換樹脂(商品名:アンバーライト〔登録商標〕15JWET、オルガノ(株))15gを加えて、室温で4時間イオン交換処理した。イオン交換樹脂を分離後、化合物溶液が得られた。得られた化合物は式(2-2)に相当し、GPCによりポリスチレン換算で測定される重量平均分子量Mwは1,400であった。
合成例1で得た樹脂をプロピレングリコールモノメチルエーテルアセテートに溶解後、イオン交換を経て樹脂溶液(固形分は20.60質量%)を得た。この樹脂溶液2.50gに1質量%界面活性剤(DIC(株)製、商品名メガファックR-40)含有プロピレングリコールモノメチルエーテルアセテート0.05g、プロピレングリコールモノメチルエーテルアセテート2.60g、を加え、口径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
合成例2で得た樹脂をプロピレングリコールモノメチルエーテルアセテートに溶解後、イオン交換を経て樹脂溶液(固形分は18.67質量%)を得た。この樹脂溶液2.80gに1質量%界面活性剤(DIC(株)製、商品名メガファックR-40)含有プロピレングリコールモノメチルエーテルアセテート0.05g、プロピレングリコールモノメチルエーテルアセテート2.38g、を加え、口径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
合成例3で得た樹脂をプロピレングリコールモノメチルエーテルアセテートに溶解後、イオン交換を経て樹脂溶液(固形分は20.00質量%)を得た。この樹脂溶液2.00gに1質量%界面活性剤(DIC(株)製、商品名メガファックR-40)含有プロピレングリコールモノメチルエーテルアセテート0.04g、プロピレングリコールモノメチルエーテルアセテート1.97g、を加え、口径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
合成例4で得た樹脂をプロピレングリコールモノメチルエーテルアセテートに溶解後、イオン交換を経て樹脂溶液(固形分は13.65質量%)を得た。この樹脂溶液5.85gに1質量%界面活性剤(DIC(株)製、商品名メガファックR-40)含有プロピレングリコールモノメチルエーテルアセテート0.16g、プロピレングリコールモノメチルエーテルアセテート3.99gを加え、口径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
合成例5で得た樹脂をプロピレングリコールモノメチルエーテルアセテートに溶解後、イオン交換を経て樹脂溶液(固形分は18.53質量%)を得た。この樹脂溶液4.31gに1質量%界面活性剤(DIC(株)製、商品名メガファックR-40)含有プロピレングリコールモノメチルエーテルアセテート0.16g、プロピレングリコールモノメチルエーテルアセテート5.53gを加え、口径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
比較合成例1で得た樹脂をプロピレングリコールモノメチルエーテルアセテートに溶解後、イオン交換を経て樹脂溶液(固形分は16.94質量%)を得た。この樹脂溶液3.00gに1質量%界面活性剤(DIC(株)製、商品名メガファックR-40)含有プロピレングリコールモノメチルエーテルアセテート0.06g、プロピレングリコールモノメチルエーテルアセテート2.04g、を加え、口径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
比較合成例2で得た樹脂溶液(固形分は25.02質量%)4.19gに界面活性剤(DIC(株)製、商品名メガファックR-40)0.001g、プロピレングリコールモノメチルエーテル6.62g、プロピレングリコールモノメチルエーテルアセテート4.19gを加え、レジスト下層膜形成組成物の溶液を調製した。
実施例1乃至5及び比較例1乃至2で調製されたレジスト下層膜形成組成物を、それぞれスピナーを用いてシリコンウェハー上に塗布(スピンコート)した。ホットプレート上で215℃、1分間加熱し、膜厚約200nmの被膜(レジスト下層膜)を形成した。このレジスト下層膜被覆膜をウシオ電機(株)製、UV照射ユニット(波長172nm)を用いた紫外線照射装置により、500mJ/cm2の紫外線照射を行い、光照射(紫外線照射)での溶剤剥離性を確認した。溶剤剥離性は紫外線照射後の塗布膜にプロピレングリコールモノメチルエーテルとプロピレングリコールモノメチルエーテルアセテートの7対3の混合溶剤を1分間浸漬し、スピンドライ後に100℃で1分間ベークし、膜厚を測定した。また、光照照射前後の膜収縮率も算出した(表1の結果)。
実施例1乃至5及び比較例1乃至2で調製したレジスト下層膜形成組成物の溶液を、それぞれスピンコーターを用いてシリコンウェハー上に塗布した。ホットプレート上で215℃1分間焼成し、レジスト下層膜(膜厚0.05μm)を形成した。これらのレジスト下層膜を、分光エリプソメーターを用いて波長193nm及び248nmでの屈折率(n値)及び光学吸光係数(k値、減衰係数とも呼ぶ)を測定した(表2の結果)。また、このレジスト下層膜被覆膜をウシオ電機(株)製、UV照射ユニット(波長172nm)を用いた紫外線照射装置により、500mJ/cm2の紫外線照射を行い、光照射(紫外線照射)後の波長193nm及び248nmでの屈折率及び光学吸光係数を測定した(表3の結果)。
ドライエッチング速度の測定に用いたエッチャー及びエッチングガスは以下のものを用いた。
RIE-10NR(サムコ製):CF4
実施例1乃至5及び比較例1乃至2で調製したレジスト下層膜形成組成物の溶液を、それぞれスピンコーターを用いてシリコンウェハー上に塗布した。ホットプレート上で215℃1分間焼成してレジスト下層膜(膜厚0.20μm)を形成した。エッチングガスとしてCF4ガスを使用してドライエッチング速度を測定し、実施例1乃至3及び比較例1乃至2とレジスト下層膜のドライエッチング速度との比較を行った。また、このレジスト下層膜被覆膜をウシオ電機(株)製、UV照射ユニット(波長172nm)を用いた紫外線照射装置により、500mJ/cm2の紫外線照射を行い、実施例1乃至3及び比較例1乃至2とレジスト下層膜のドライエッチング速度との比較を行った。結果を表4に示した。ドライエッチング速度比は(レジスト下層膜)/(KrFフォトレジスト)のドライエッチング速度比である(表4の結果)。
実施例1乃至5及び比較例1乃至2で調製したレジスト下層膜形成組成物の溶液を、それぞれスピンコーターを用いてシリコンウェハー上に塗布し、ホットプレート上で215℃60秒間焼成して、レジスト下層膜(膜厚0.20μm)を形成した。また、このレジスト下層膜被覆膜をウシオ電機(株)製、UV照射ユニット(波長172nm)を用いた紫外線照射装置により、500mJ/cm2の紫外線照射を行った。得られた膜を室温(約20℃)から一分間に10℃ずつの割合で昇温加熱して大気中で熱重量分析を行い、重量減少の経時変化を追跡した。結果を表5に示す。
段差被覆性の評価として、200nm膜厚のSiO2基板で、トレンチ幅50nm、ピッチ100nmのデンスパターンエリア(DENSE)とパターンが形成されていないオープンエリア(OPEN)の被覆膜厚の比較を行った。実施例1乃至3及び比較例1乃至2のレジスト下層膜形成組成物を上記基板上に塗布後、215℃で60秒間焼成してレジスト下層膜を形成した。レジスト下層膜形成組成物は、ベタ基板上での膜厚が150nmになるように調製した。この基板の段差被覆性を日立ハイテクノロジーズ(株)製走査型電子顕微鏡(S-4800)を用いて観察し、段差基板のデンスエリア(パターン部)とオープンエリア(パターンなし部)との膜厚差(デンスエリアとオープンエリアとの塗布段差でありバイアスと呼ぶ)を測定することで平坦化性を評価した。ここで、平坦化性とは、パターンが存在する部分(デンスエリア(パターン部))と、パターンが存在しない部分(オープンエリア(パターンなし部))とで、その上部に存在する塗布された被覆物の膜厚差(Iso-denseバイアス)が小さいことを意味する(表6の結果)。
Claims (13)
- 式(1):
A2及びA3は、それぞれ独立して、ベンゼン環又はナフタレン環から誘導される基であり、B1、B2及びB3は、それぞれ独立して、式(2):
- Xがカルボニル基である請求項1に記載の光硬化性段差基板被覆組成物。
- ポリマーが式(1)の単位構造、又は式(1)と式(3)の単位構造に更に式(1)においてn1=0、n2=0、及びn3=0となる式(1’)の単位構造を含む請求項1乃至請求項3のいずれか1項に記載の光硬化性段差基板被覆組成物。
- 段差基板被覆組成物が、半導体装置製造のリソグラフィー工程に用いられるレジスト下層膜形成組成物である請求項1乃至請求項4のいずれか1項に記載の光硬化性段差基板被覆組成物。
- 段差を有する基板に請求項1乃至請求項5のいずれか1項に記載の光硬化性段差基板被覆
組成物を塗布する工程(i)、及び露光する工程(ii)を含む被覆基板の製造方法。 - 工程(i)の光硬化性段差基板被覆組成物を塗布した後に70乃至400℃の温度で、10秒乃至5分間の加熱を行う(ia)工程を加える請求項6に記載の被覆基板の製造方法。
- 工程(ii)の露光波長が150nm乃至248nmである請求項6又は請求項7に記載の被覆基板の製造方法。
- 工程(ii)の露光量が10mJ/cm2乃至3000mJ/cm2である請求項6乃至請求項8のいずれか1項に記載の被覆基板の製造方法。
- 基板がオープンエリア(非パターンエリア)と、DENCE(密)及びISO(粗)のパターンエリアを有し、パターンのアスペクト比が0.1乃至10である請求項6乃至請求項9のいずれか1項に記載の被覆基板の製造方法。
- オープンエリアとパターンエリアとのBias(塗布段差)が1乃至50nmである請求項10に記載の被覆基板の製造方法。
- 段差を有する基板上に請求項1乃至請求項5のいずれか1項に記載の段差基板被覆組成物により下層膜を形成する工程、その上にレジスト膜を形成する工程、光又は電子線の照射と現像によりレジストパターンを形成する工程、レジストパターンにより該下層膜をエッチングする工程、及びパターン化された下層膜により半導体基板を加工する工程を含む半導体装置の製造方法。
- 段差を有する基板に請求項1乃至請求項5のいずれか1項に記載の光硬化性段差基板被覆組成物により下層膜を形成する工程、その上にハードマスクを形成する工程、更にその上にレジスト膜を形成する工程、光又は電子線の照射と現像によりレジストパターンを形成する工程、レジストパターンによりハードマスクをエッチングする工程、パターン化されたハードマスクにより該下層膜をエッチングする工程、及びパターン化された下層膜により半導体基板を加工する工程を含む半導体装置の製造方法。
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