JP4340167B2 - 珪素含有レジスト下層膜材料及びパターン形成方法 - Google Patents
珪素含有レジスト下層膜材料及びパターン形成方法 Download PDFInfo
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- JP4340167B2 JP4340167B2 JP2004026470A JP2004026470A JP4340167B2 JP 4340167 B2 JP4340167 B2 JP 4340167B2 JP 2004026470 A JP2004026470 A JP 2004026470A JP 2004026470 A JP2004026470 A JP 2004026470A JP 4340167 B2 JP4340167 B2 JP 4340167B2
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- 239000000463 material Substances 0.000 title claims description 64
- 238000000034 method Methods 0.000 title claims description 58
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- 239000010703 silicon Substances 0.000 title claims description 50
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims description 49
- 239000000758 substrate Substances 0.000 claims description 72
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- 125000004432 carbon atom Chemical group C* 0.000 claims description 36
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- 238000001459 lithography Methods 0.000 claims description 27
- 238000010894 electron beam technology Methods 0.000 claims description 21
- 150000001875 compounds Chemical class 0.000 claims description 19
- 125000002947 alkylene group Chemical group 0.000 claims description 15
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- 125000004122 cyclic group Chemical group 0.000 claims description 10
- 125000004185 ester group Chemical group 0.000 claims description 8
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 5
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- 150000003839 salts Chemical class 0.000 description 5
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- 239000003054 catalyst Substances 0.000 description 4
- 238000006482 condensation reaction Methods 0.000 description 4
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 4
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- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 4
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- 230000007261 regionalization Effects 0.000 description 4
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 4
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- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 0 CCC(C)(C)[N+](*(C)C1(*C)[C@](C)CCOC1)[O-] Chemical compound CCC(C)(C)[N+](*(C)C1(*C)[C@](C)CCOC1)[O-] 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical compound CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
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- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- 125000002777 acetyl group Chemical group [H]C([H])([H])C(*)=O 0.000 description 3
- 229920005601 base polymer Polymers 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
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- 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
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- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 description 3
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- 230000000694 effects Effects 0.000 description 3
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- DQYBDCGIPTYXML-UHFFFAOYSA-N ethoxyethane;hydrate Chemical compound O.CCOCC DQYBDCGIPTYXML-UHFFFAOYSA-N 0.000 description 3
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- 125000001072 heteroaryl group Chemical group 0.000 description 3
- FFUAGWLWBBFQJT-UHFFFAOYSA-N hexamethyldisilazane Chemical compound C[Si](C)(C)N[Si](C)(C)C FFUAGWLWBBFQJT-UHFFFAOYSA-N 0.000 description 3
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 3
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- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 3
- IZJVVXCHJIQVOL-UHFFFAOYSA-N nitro(phenyl)methanesulfonic acid Chemical class OS(=O)(=O)C([N+]([O-])=O)C1=CC=CC=C1 IZJVVXCHJIQVOL-UHFFFAOYSA-N 0.000 description 3
- 125000002347 octyl 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])[H] 0.000 description 3
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- JGTNAGYHADQMCM-UHFFFAOYSA-M 1,1,2,2,3,3,4,4,4-nonafluorobutane-1-sulfonate Chemical compound [O-]S(=O)(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F JGTNAGYHADQMCM-UHFFFAOYSA-M 0.000 description 2
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- 125000000094 2-phenylethyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])C([H])([H])* 0.000 description 2
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- GLGXSTXZLFQYKJ-UHFFFAOYSA-N [cyclohexylsulfonyl(diazo)methyl]sulfonylcyclohexane Chemical compound C1CCCCC1S(=O)(=O)C(=[N+]=[N-])S(=O)(=O)C1CCCCC1 GLGXSTXZLFQYKJ-UHFFFAOYSA-N 0.000 description 2
- 125000001539 acetonyl group Chemical group [H]C([H])([H])C(=O)C([H])([H])* 0.000 description 2
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- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 2
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- 239000000460 chlorine Substances 0.000 description 2
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- IJOOHPMOJXWVHK-UHFFFAOYSA-N chlorotrimethylsilane Chemical compound C[Si](C)(C)Cl IJOOHPMOJXWVHK-UHFFFAOYSA-N 0.000 description 2
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- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 235000021313 oleic acid Nutrition 0.000 description 1
- 239000012044 organic layer Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 125000000636 p-nitrophenyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1*)[N+]([O-])=O 0.000 description 1
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
- 125000004817 pentamethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[*:1] 0.000 description 1
- 229940083254 peripheral vasodilators imidazoline derivative Drugs 0.000 description 1
- 229940083251 peripheral vasodilators purine derivative Drugs 0.000 description 1
- 150000005053 phenanthridines Chemical class 0.000 description 1
- 150000002988 phenazines Chemical class 0.000 description 1
- 125000000286 phenylethyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000003170 phenylsulfonyl group Chemical group C1(=CC=CC=C1)S(=O)(=O)* 0.000 description 1
- LFSXCDWNBUNEEM-UHFFFAOYSA-N phthalazine Chemical compound C1=NN=CC2=CC=CC=C21 LFSXCDWNBUNEEM-UHFFFAOYSA-N 0.000 description 1
- 150000004885 piperazines Chemical class 0.000 description 1
- 150000003053 piperidines Chemical class 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 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
- 238000003672 processing method Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 125000004368 propenyl group Chemical group C(=CC)* 0.000 description 1
- 235000019260 propionic acid Nutrition 0.000 description 1
- 125000002572 propoxy group Chemical group [*]OC([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 1
- 125000006233 propoxy propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])OC([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000006225 propoxyethyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])OC([H])([H])C([H])([H])* 0.000 description 1
- 125000005767 propoxymethyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])[#8]C([H])([H])* 0.000 description 1
- 125000001042 pteridinyl group Chemical class N1=C(N=CC2=NC=CN=C12)* 0.000 description 1
- 150000003212 purines Chemical class 0.000 description 1
- 150000003216 pyrazines Chemical class 0.000 description 1
- 150000003217 pyrazoles Chemical class 0.000 description 1
- 150000003218 pyrazolidines Chemical class 0.000 description 1
- 150000003219 pyrazolines Chemical class 0.000 description 1
- 150000004892 pyridazines Chemical class 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 150000003222 pyridines Chemical class 0.000 description 1
- 125000004076 pyridyl group Chemical group 0.000 description 1
- 229940083082 pyrimidine derivative acting on arteriolar smooth muscle Drugs 0.000 description 1
- 150000003230 pyrimidines Chemical class 0.000 description 1
- HNJBEVLQSNELDL-UHFFFAOYSA-N pyrrolidin-2-one Chemical compound O=C1CCCN1 HNJBEVLQSNELDL-UHFFFAOYSA-N 0.000 description 1
- 150000003235 pyrrolidines Chemical class 0.000 description 1
- ZVJHJDDKYZXRJI-UHFFFAOYSA-N pyrroline Natural products C1CC=NC1 ZVJHJDDKYZXRJI-UHFFFAOYSA-N 0.000 description 1
- 150000003236 pyrrolines Chemical class 0.000 description 1
- 125000002294 quinazolinyl group Chemical class N1=C(N=CC2=CC=CC=C12)* 0.000 description 1
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 1
- QZZYYBQGTSGDPP-UHFFFAOYSA-N quinoline-3-carbonitrile Chemical compound C1=CC=CC2=CC(C#N)=CN=C21 QZZYYBQGTSGDPP-UHFFFAOYSA-N 0.000 description 1
- 150000003248 quinolines Chemical class 0.000 description 1
- 150000003252 quinoxalines Chemical class 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 229960004889 salicylic acid Drugs 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 125000005372 silanol group Chemical group 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229920005573 silicon-containing polymer Polymers 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- HHVIBTZHLRERCL-UHFFFAOYSA-N sulfonyldimethane Chemical class CS(C)(=O)=O HHVIBTZHLRERCL-UHFFFAOYSA-N 0.000 description 1
- 229940066771 systemic antihistamines piperazine derivative Drugs 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 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
- DZLFLBLQUQXARW-UHFFFAOYSA-N tetrabutylammonium Chemical compound CCCC[N+](CCCC)(CCCC)CCCC DZLFLBLQUQXARW-UHFFFAOYSA-N 0.000 description 1
- MANNXDXMUHZSRP-UHFFFAOYSA-M tetramethylazanium;trifluoromethanesulfonate Chemical compound C[N+](C)(C)C.[O-]S(=O)(=O)C(F)(F)F MANNXDXMUHZSRP-UHFFFAOYSA-M 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 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
- ZMANZCXQSJIPKH-UHFFFAOYSA-O triethylammonium ion Chemical compound CC[NH+](CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-O 0.000 description 1
- AANIRNIRVXARSN-UHFFFAOYSA-M trifluoromethanesulfonate;trimethylsulfanium Chemical compound C[S+](C)C.[O-]S(=O)(=O)C(F)(F)F AANIRNIRVXARSN-UHFFFAOYSA-M 0.000 description 1
- UPWIJTYOHJOEOX-UHFFFAOYSA-M trifluoromethanesulfonate;trinaphthalen-1-ylsulfanium Chemical compound [O-]S(=O)(=O)C(F)(F)F.C1=CC=C2C([S+](C=3C4=CC=CC=C4C=CC=3)C=3C4=CC=CC=C4C=CC=3)=CC=CC2=C1 UPWIJTYOHJOEOX-UHFFFAOYSA-M 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- 125000001889 triflyl group Chemical group FC(F)(F)S(*)(=O)=O 0.000 description 1
- ZNOCGWVLWPVKAO-UHFFFAOYSA-N trimethoxy(phenyl)silane Chemical compound CO[Si](OC)(OC)C1=CC=CC=C1 ZNOCGWVLWPVKAO-UHFFFAOYSA-N 0.000 description 1
- 239000005051 trimethylchlorosilane Substances 0.000 description 1
- 125000003258 trimethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])[*:1] 0.000 description 1
- PQDJYEQOELDLCP-UHFFFAOYSA-N trimethylsilane Chemical compound C[SiH](C)C PQDJYEQOELDLCP-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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Description
以下、3層レジストプロセスについて説明する。
3層レジストプロセスでは、基板上に3層の膜、すなわち、上層に通常のフォトレジスト組成物のレジスト上層膜、その下に珪素、チタン、ゲルマニウムなどの元素を含むレジスト下層膜、その下に有機膜を形成する。そして、通常のリソグラフィーを用いて上層のレジスト上層膜にレジストパターンを形成し、その下の珪素などを有するレジスト下層膜をエッチング加工してレジストパターンを転写する。レジスト下層膜の加工は、フロン系のガスを用いるので、上層のレジスト上層膜よりも数倍速い速度で珪素含有レジスト下層膜にレジストパターンを転写できる。次いで酸素ガスを主体とするエッチングで珪素含有レジスト下層膜をマスクにして有機膜にパターンを転写する。酸素ガスエッチングにおける、有機膜のエッチング速度は珪素含有レジスト下層膜よりも数倍〜数十倍も早いため、高アスペクトな有機膜パターンを形成することができる。最後にパターンを形成した有機膜をマスクにして被加工基板のエッチングによる加工を行う。被加工基板のエッチングに対して耐性の高い炭素密度の高い有機膜を用いることによって高アスペクトな基板加工が可能になるのである。
近年、リソグラフィー技術を用いた100nm以下の超微細加工においては寸法制御の問題が深刻になってきている。従来のように、多層レジスト膜のレジスト下層膜を、酸により架橋させることや、あるいは、架橋剤を添加して酸により架橋させることで、レジストパターンの裾引き、アンダーカットを制御するだけでは、100nm以下のパターン寸法制御は困難である。特に電子ビームや軟X線といった短波長での露光におけるエネルギーの歪み、多層レジスト膜のレジスト上層膜中あるいはレジスト下層膜中の酸のミクロ的な不均一拡散によって、レジストパターンにラインエッジラフネスが発生し、またホールのサイズのバラツキが生じると考えられる。
ここで、加工寸法が100nm以下のレジストパターンを形成するために用いる、電子線、軟X線といった短波長の光露光では、レジスト下層膜が反射防止機能を有するか否かはそれほど重要ではない。
このように珪素含有レジスト下層膜材料が、さらに有機溶剤及び/又は酸発生剤を含有するものであれば、基板等への塗布性を向上させたり、基板等への塗布後のベーク等により、レジスト下層膜内での架橋反応を促進させたりすることができる。したがって、このような珪素含有下層膜は、膜均一性が良く、レジスト上層膜とのミキシングの恐れが少なく、レジスト上層膜への酸の拡散が少ないものとなる。
i.)下記一般式(P1a−1)、(P1a−2)、(P1a−3)又は(P1b)のオニウム塩、
ii.)下記一般式(P2)のジアゾメタン誘導体、
iii.)下記一般式(P3)のグリオキシム誘導体、
iv.)下記一般式(P4)のビススルホン誘導体、
v.)下記一般式(P5)のN−ヒドロキシイミド化合物のスルホン酸エステル、
vi.)β−ケトスルホン酸誘導体、
vii.)ジスルホン誘導体、
viii.)ニトロベンジルスルホネート誘導体、
ix.)スルホン酸エステル誘導体
等が挙げられる。
ビス(ベンゼンスルホニル)ジアゾメタン、ビス(p−トルエンスルホニル)ジアゾメタン、ビス(シクロヘキシルスルホニル)ジアゾメタン、ビス(n−ブチルスルホニル)ジアゾメタン、ビス(イソブチルスルホニル)ジアゾメタン、ビス(sec−ブチルスルホニル)ジアゾメタン、ビス(n−プロピルスルホニル)ジアゾメタン、ビス(イソプロピルスルホニル)ジアゾメタン、ビス(tert−ブチルスルホニル)ジアゾメタン等のジアゾメタン誘導体、
ビス−O−(p−トルエンスルホニル)−α−ジメチルグリオキシム、ビス−O−(n−ブタンスルホニル)−α−ジメチルグリオキシム等のグリオキシム誘導体、
ビスナフチルスルホニルメタン等のビススルホン誘導体、
N−ヒドロキシスクシンイミドメタンスルホン酸エステル、N−ヒドロキシスクシンイミドトリフルオロメタンスルホン酸エステル、N−ヒドロキシスクシンイミド1−プロパンスルホン酸エステル、N−ヒドロキシスクシンイミド2−プロパンスルホン酸エステル、N−ヒドロキシスクシンイミド1−ペンタンスルホン酸エステル、N−ヒドロキシスクシンイミドp−トルエンスルホン酸エステル、N−ヒドロキシナフタルイミドメタンスルホン酸エステル、N−ヒドロキシナフタルイミドベンゼンスルホン酸エステル等のN−ヒドロキシイミド化合物のスルホン酸エステル誘導体が好ましく用いられる。
酸発生剤の添加量は、ベースポリマー100部(質量部、以下同様)に対して好ましくは0.1〜50部、より好ましくは0.5〜40部である。0.1部より少ないと酸発生量が少なく、架橋反応が不十分な場合があり、50部を超えると上層のフォトレジスト膜へ酸が移動することによるミキシング現象が起こる場合がある。
先ず、図1(a)に示すように、基板11上にレジスト下層膜12及びレジスト上層膜13を形成する方法について説明する。
レジスト下層膜12は、スピンコート法などで本発明のレジスト下層膜材料を基板11上に塗布して形成することが可能である。スピンコート法などで塗布後、有機溶剤を蒸発し、上層となるレジスト上層膜13とのミキシング防止のため、ベークして架橋反応を促進させることが望ましい。ベーク温度は80〜300℃の範囲内で、ベーク時間は10秒から300秒の範囲内が好ましく用いられる。
しかし、この他に、本発明では、レジスト下層膜にパターンを転写後、レジスト上層膜を除去せずに、レジスト上層膜をマスクとして、基板にパターンを形成することも可能である。
基板21上に有機膜22をスピンコート法などで形成する。この有機膜22は、基板21をエッチングするときのマスクとして作用する。したがって、有機膜22は、基板エッチング時に、エッチング耐性が高いことが望ましい。また、有機膜22は、上層のレジスト下層膜24とミキシングしないことも求められるので、スピンコート等で塗布した後に熱あるいは酸によって架橋することが望ましい。そして、この有機膜22の上に、本発明のレジスト下層膜材料から形成するレジスト下層膜24、レジスト上層膜23を図1で説明したのと同様の方法で作成する。
(合成例1)
テトラヒドロフラン200g、純水100gに2−(3,4−エポキシシクロヘキシル)エチルトリメトキシシラン40gを溶解させ液温を35℃にし、テトラメチルアンモニウムヒドロキシドを5g添加し、その後60℃に昇温し、シラノールの縮合反応を行った。
前記反応液にジエチルエーテルを200g加え水層を分別し、有機液層1%の酢酸とを超純水で2回洗浄、プロピレングリコールモノメチルエーテルアセテート(PGMEA)を200g加え、液温を60℃に加熱しながらの減圧下にテトラヒドロフラン(THF)、ジエチルエーテル水を除去し、下記ポリマー1を得た。
ポリマー1;分子量(Mw)=3600
テトラヒドロフラン200g、純水100gに2−(3,4−エポキシシクロヘキシル)エチルトリメトキシシラン38gとフェニルトリメトキシシラン25gを溶解させ液温を35℃にし、テトラメチルアンモニウムヒドロキシドを5g添加し、その後60℃に昇温し、シラノールの縮合反応を行った。
比較ポリマー1;b:c(共重合比)=0.3:0.7
分子量(Mw)=2300
テトラヒドロフラン200g、純水100gに4−アセトキシフェニルエチルトリメトキシシラン45gを溶解させ液温を35℃にし、テトラメチルアンモニウムヒドロキシドを5g添加し、その後60℃に昇温し、シラノールの縮合反応とアセチル基の脱離反応を行った。
比較ポリマー2;分子量(Mw)=7800
[レジスト下層膜材料の調製]
上記合成例1、比較合成例1、2で得られた高分子化合物、CR−1で示される架橋剤、AG1で示される酸発生剤を、FC−430(住友スリーエム社製)0.1質量%を含む有機溶剤中に表1に示す割合で溶解させ、0.1μmの弗素樹脂製のフィルターでろ過することによってレジスト下層膜材料(実施例1、比較例1、2)をそれぞれ調製した。
ポリマー1: 合成例1より
比較ポリマー1,2: 比較合成例1,2より
架橋剤: CR―1(下記構造式参照。)
レジスト上層膜材料のベース樹脂として、下記高分子化合物(EBレジストポリマー)を準備した。
高分子化合物:EBレジストポリマー、
酸発生剤:PAG1、PAG2(下記構造式参照。)、
有機溶剤: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)。
上記調製した珪素含有レジスト下層膜材料(実施例1、比較例1、2)をシリコン基板上に塗布して、200℃で90秒間ベークし、膜厚70nmのレジスト下層膜を形成した。
また、レジスト下層膜を形成しないシリコン基板も用意した。このシリコン基板は、200℃で60秒ベーク後、100℃で60秒間HMDSベーパープライム、23℃で30秒冷却する処理を行い、用いた。
比較ポリマー3として、クレゾールノボラックポリマー(m/p=6/4、分子量(Mw)=6800)を準備した。
上記合成例1で得られたポリマー1を1g、上記比較ポリマー3を3gとり、それぞれ5g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に十分に溶解させ、0.1μmのフィルターで濾過して、ポリマー溶液を調製した。ポリマー1から調製したポリマー溶液を実施例2とし、比較ポリマー3から調製したポリマー溶液を比較例3とする。
次に、形成したポリマー膜に対して下記の条件でドライエッチング耐性試験を行い、エッチング前後のポリマー膜の膜厚差を求めた。
東京エレクトロン株式会社製ドライエッチング装置TE−8500Pを用い、エッチング前後のポリマー膜の膜厚差をそれぞれ測定した。このO2ガスによるエッチングは、パターンを形成した珪素含有レジスト下層膜をマスクにして、その下の有機膜等を加工するのに用いられる。
チャンバー圧力 450mTorr(約60Pa)
RFパワー 600W
Arガス流量 40sccm
O2ガス流量 60sccm
ギャップ 9mm
時間 60sec
この結果を表4に示す。
12,24…レジスト下層膜、 13,23…レジスト上層膜、
15,25…パターン回路領域、 22…有機膜。
Claims (3)
- リソグラフィーにより基板にパターンを形成する方法であって、少なくとも、基板上に、下記一般式(1)’で示される繰り返し単位a1からなる高分子化合物を含む珪素含有レジスト下層膜材料を用いてレジスト下層膜を形成し、該レジスト下層膜の上に、フォトレジスト組成物のレジスト上層膜材料を用いてレジスト上層膜を形成して、多層レジスト膜とし、該多層レジスト膜のパターン回路領域を露光した後、現像液で現像してレジスト上層膜にレジストパターンを形成し、該レジストパターンが形成されたレジスト上層膜をマスクにしてレジスト下層膜をエッチングし、さらにパターンが形成されたレジスト下層膜をマスクにして基板をエッチングして基板にパターンを形成することを特徴とするパターン形成方法。
- リソグラフィーにより基板にパターンを形成する方法であって、少なくとも、基板上に、有機膜を形成し、該有機膜の上に、下記一般式(1)’で示される繰り返し単位a1からなる高分子化合物を含む珪素含有レジスト下層膜材料を用いてレジスト下層膜を形成し、該レジスト下層膜の上に、フォトレジスト組成物のレジスト上層膜材料を用いてレジスト上層膜を形成して、多層レジスト膜とし、該多層レジスト膜のパターン回路領域を露光した後、現像液で現像してレジスト上層膜にレジストパターンを形成し、該レジストパターンが形成されたレジスト上層膜をマスクにしてレジスト下層膜をエッチングし、さらに少なくともパターンが形成されたレジスト下層膜をマスクにして有機膜をエッチングし、さらに少なくともパターンが形成された有機膜をマスクにして基板をエッチングして基板にパターンを形成することを特徴とするパターン形成方法。
- 前記パターン回路領域露光は、光源を、加速電圧1keV以上のエレクトロンビーム、又は波長3〜20nmの軟X線として行うことを特徴とする請求項1又は請求項2に記載のパターン形成方法。
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JP4563927B2 (ja) * | 2005-12-02 | 2010-10-20 | 信越化学工業株式会社 | 基板及びその製造方法、並びにそれを用いたパターン形成方法 |
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WO2008075599A1 (ja) * | 2006-12-18 | 2008-06-26 | Tokyo Electron Limited | 電子線描画方法 |
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JP5170511B2 (ja) * | 2007-04-05 | 2013-03-27 | 日産化学工業株式会社 | 電子線硬化のケイ素含有レジスト下層膜を形成するためのケイ素含有レジスト下層膜形成組成物 |
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JP4946787B2 (ja) * | 2007-10-22 | 2012-06-06 | Jsr株式会社 | レジスト下層膜用組成物及びその製造方法 |
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WO2017145809A1 (ja) * | 2016-02-24 | 2017-08-31 | 日産化学工業株式会社 | シリコン含有パターン反転用被覆剤 |
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