JP6428596B2 - レジスト組成物、パターン形成方法、高分子化合物、及び単量体 - Google Patents
レジスト組成物、パターン形成方法、高分子化合物、及び単量体 Download PDFInfo
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- JP6428596B2 JP6428596B2 JP2015253067A JP2015253067A JP6428596B2 JP 6428596 B2 JP6428596 B2 JP 6428596B2 JP 2015253067 A JP2015253067 A JP 2015253067A JP 2015253067 A JP2015253067 A JP 2015253067A JP 6428596 B2 JP6428596 B2 JP 6428596B2
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- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 description 10
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- 125000000582 cycloheptyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 3
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- SONHXMAHPHADTF-UHFFFAOYSA-M sodium;2-methylprop-2-enoate Chemical compound [Na+].CC(=C)C([O-])=O SONHXMAHPHADTF-UHFFFAOYSA-M 0.000 description 1
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- 125000003003 spiro group Chemical group 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000001174 sulfone group Chemical group 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-O sulfonium Chemical compound [SH3+] RWSOTUBLDIXVET-UHFFFAOYSA-O 0.000 description 1
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- GFYHSKONPJXCDE-UHFFFAOYSA-N sym-collidine Natural products CC1=CN=C(C)C(C)=C1 GFYHSKONPJXCDE-UHFFFAOYSA-N 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
- VDZOOKBUILJEDG-UHFFFAOYSA-M tetrabutylammonium hydroxide Chemical compound [OH-].CCCC[N+](CCCC)(CCCC)CCCC VDZOOKBUILJEDG-UHFFFAOYSA-M 0.000 description 1
- YBDQLHBVNXARAU-ZCFIWIBFSA-N tetrahydro-2-methyl-2H-pyran Natural products C[C@@H]1CCCCO1 YBDQLHBVNXARAU-ZCFIWIBFSA-N 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
- 229910052718 tin Inorganic materials 0.000 description 1
- 150000003606 tin compounds Chemical class 0.000 description 1
- VXUYXOFXAQZZMF-UHFFFAOYSA-N titanium(IV) isopropoxide Chemical compound CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- 238000005809 transesterification reaction Methods 0.000 description 1
- VRAWXSCCKYEDOG-UHFFFAOYSA-N tribenzylsulfanium Chemical compound C=1C=CC=CC=1C[S+](CC=1C=CC=CC=1)CC1=CC=CC=C1 VRAWXSCCKYEDOG-UHFFFAOYSA-N 0.000 description 1
- YNJBWRMUSHSURL-UHFFFAOYSA-N trichloroacetic acid Chemical compound OC(=O)C(Cl)(Cl)Cl YNJBWRMUSHSURL-UHFFFAOYSA-N 0.000 description 1
- 229960004319 trichloroacetic acid Drugs 0.000 description 1
- 125000003258 trimethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])[*:1] 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
- NRZWQKGABZFFKE-UHFFFAOYSA-N trimethylsulfonium Chemical compound C[S+](C)C NRZWQKGABZFFKE-UHFFFAOYSA-N 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
- XUWXFPUSCUUNPR-UHFFFAOYSA-O tris(4-hydroxyphenyl)sulfanium Chemical compound C1=CC(O)=CC=C1[S+](C=1C=CC(O)=CC=1)C1=CC=C(O)C=C1 XUWXFPUSCUUNPR-UHFFFAOYSA-O 0.000 description 1
- ZMOJTPABCOWEOS-UHFFFAOYSA-N tris(4-tert-butylphenyl)sulfanium Chemical compound C1=CC(C(C)(C)C)=CC=C1[S+](C=1C=CC(=CC=1)C(C)(C)C)C1=CC=C(C(C)(C)C)C=C1 ZMOJTPABCOWEOS-UHFFFAOYSA-N 0.000 description 1
- DMJFWVWYOPMJIK-UHFFFAOYSA-N tris[3,4-bis[(2-methylpropan-2-yl)oxy]phenyl]sulfanium Chemical compound C1=C(OC(C)(C)C)C(OC(C)(C)C)=CC=C1[S+](C=1C=C(OC(C)(C)C)C(OC(C)(C)C)=CC=1)C1=CC=C(OC(C)(C)C)C(OC(C)(C)C)=C1 DMJFWVWYOPMJIK-UHFFFAOYSA-N 0.000 description 1
- HENPLGIMUIZOJQ-UHFFFAOYSA-N tris[3-[(2-methylpropan-2-yl)oxy]phenyl]sulfanium Chemical compound CC(C)(C)OC1=CC=CC([S+](C=2C=C(OC(C)(C)C)C=CC=2)C=2C=C(OC(C)(C)C)C=CC=2)=C1 HENPLGIMUIZOJQ-UHFFFAOYSA-N 0.000 description 1
- YNIMTIPTLNZOMC-UHFFFAOYSA-N tris[4-(dimethylamino)phenyl]sulfanium Chemical compound C1=CC(N(C)C)=CC=C1[S+](C=1C=CC(=CC=1)N(C)C)C1=CC=C(N(C)C)C=C1 YNIMTIPTLNZOMC-UHFFFAOYSA-N 0.000 description 1
- PNXQORBBJALXKA-UHFFFAOYSA-N tris[4-[(2-methylpropan-2-yl)oxy]phenyl]sulfanium Chemical compound C1=CC(OC(C)(C)C)=CC=C1[S+](C=1C=CC(OC(C)(C)C)=CC=1)C1=CC=C(OC(C)(C)C)C=C1 PNXQORBBJALXKA-UHFFFAOYSA-N 0.000 description 1
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Classifications
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Description
1.下記式(1)で表される繰り返し単位を含む高分子化合物。
2.式(1)で表される繰り返し単位が、下記式(2)又は(3)で表される繰り返し単位である1の高分子化合物。
3.更に、下記式(4)で表される繰り返し単位を含む1又は2の高分子化合物。
4.更に、下記式(5)〜(7)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1〜3のいずれかの高分子化合物。
5.(A)1〜4のいずれかの高分子化合物を含むベース樹脂、(B)光酸発生剤、及び(C)溶剤を含むレジスト組成物。
6.(B)光酸発生剤が、下記式(B−1)で表される光酸発生剤を含む5のレジスト組成物。
(R8)(R9)N−R10− (i)
(式中、R8及びR9は、それぞれ独立に、水素原子、又はヘテロ原子で置換されていてもよい炭素数1〜20の1価炭化水素基を表す。R8とR9とは、互いに結合してこれらが結合する窒素原子と共に環を形成してもよい。R10は、ヘテロ原子を含んでいてもよい炭素数1〜20の2価炭化水素基を表す。)
で表される基を表す。Aは、水素原子又はトリフルオロメチル基を表す。R101、R102及びR103は、それぞれ独立に、置換若しくは非置換の炭素数1〜10の直鎖状若しくは分岐状のアルキル基、アルケニル基若しくはオキソアルキル基、又は置換若しくは非置換の炭素数6〜18のアリール基、アラルキル基若しくはアリールオキソアルキル基を表す。R101、R102及びR103のうちのいずれか2つは、互いに結合してこれらが結合する硫黄原子と共に環を形成してもよい。]
7.(B)光酸発生剤が、下記式(B−2)で表される光酸発生剤を含む5又は6のレジスト組成物。
8.(B)光酸発生剤が、下記式(B−3)で表される光酸発生剤を含む5〜7のいずれかのレジスト組成物。
(R8)(R9)N−R10− (i)
(式中、R8及びR9は、それぞれ独立に、水素原子、又はヘテロ原子で置換されていてもよい炭素数1〜20の1価炭化水素基を表す。R8とR9とは、互いに結合してこれらが結合する窒素原子と共に環を形成してもよい。R10は、ヘテロ原子を含んでいてもよい炭素数1〜20の2価炭化水素基を表す。)
で表される基を表す。R101、R102及びR103は、それぞれ独立に、置換若しくは非置換の炭素数1〜10の直鎖状若しくは分岐状のアルキル基、アルケニル基若しくはオキソアルキル基、又は置換若しくは非置換の炭素数6〜18のアリール基、アラルキル基若しくはアリールオキソアルキル基を表す。R101、R102及びR103のうちのいずれか2つは、互いに結合してこれらが結合する硫黄原子と共に環を形成してもよい。]
9.更に、前記(A)高分子化合物とは異なる高分子化合物であって、下記式(D−1)〜(D−5)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(D)第2の高分子化合物を含む、5〜8のいずれかのレジスト組成物。
−C(=O)−O−R17 (ii)
(式中、R17は、炭素数1〜20の直鎖状、分岐状又は環状のフッ素化炭化水素基を表す。)
で表される基を表す。R16は、炭素数1〜15の直鎖状、分岐状又は環状の1価炭化水素基又はフッ素化1価炭化水素基を表し、炭素−炭素結合間に、エーテル結合(−O−)又はカルボニル基(−C(=O)−)が含まれていてもよい。]
10.5〜9のいずれかのレジスト組成物を基板上に塗布する工程、加熱処理後、得られたレジスト膜をKrFエキシマレーザー、ArFエキシマレーザー、電子線(EB)又はEUVで露光する工程、及び加熱処理した後、現像液を用いて現像する工程、を含むパターン形成方法。
11.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10のパターン形成方法。
12.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屈折率1.0以上の液体を介在させて液浸露光を行う10のパターン形成方法。
13.前記現像液が有機溶剤を含み、現像によってネガティブパターンを形成する10〜12のいずれかのパターン形成方法。
14.下記式(8)で表される単量体。
15.下記式(9)で表される単量体。
16.下記式(10)で表される単量体。
(II)式(4)〜(7)で表される繰り返し単位の1種又は2種以上を1モル%以上100モル%未満、好ましくは1〜95モル%、より好ましくは20〜90モル%含み、必要に応じ、
(III)その他の繰り返し単位の1種又は2種以上を0〜80モル%、好ましくは0〜70モル%、より好ましくは0〜50モル%含むことができる。
本発明のレジスト組成物は、(A)前述した本発明の高分子化合物を含むベース樹脂、(B)光酸発生剤、及び(C)溶剤を含む。
(R8)(R9)N−R10− (i)
(式中、R8及びR9は、それぞれ独立に、水素原子、又はヘテロ原子で置換されていてもよい炭素数1〜20の1価炭化水素基を表す。R8とR9とは、互いに結合してこれらが結合する窒素原子と共に環を形成してもよい。R10は、ヘテロ原子を含んでいてもよい炭素数1〜20の2価炭化水素基を表す。)
−C(=O)−O−R17 (ii)
(式中、R17は、炭素数1〜20の直鎖状、分岐状又は環状のフッ素化炭化水素基を表す。)
で表される基を表す。R16は、炭素数1〜15の直鎖状、分岐状又は環状の1価炭化水素基又はフッ素化1価炭化水素基を表し、炭素−炭素結合間に、エーテル結合(−O−)又はカルボニル基(−C(=O)−)が含まれていてもよい。
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、MoSi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。
窒素雰囲気下、1.0mol/L塩化メチルマグネシウム−THF溶液(1,500mL)へ、酸無水物1(164g)をTHF(500g)に溶解した溶液を30℃以下で滴下した。そのままの温度にて5時間攪拌した後、10質量%塩酸(980g)を滴下して反応を停止した。通常の水系後処理(aqueous work-up)を行ったのち、有機層を濃縮し、粗ラクトン1(175g)を得た。
実施例1−1−1で得た粗ラクトン1(175g)及びクロロ酢酸(132g)の溶液を100℃に加熱し、トリフルオロメタンスルホン酸(15.0g)を1時間かけて滴下した。そのままの温度にて30分攪拌した後、トルエン(200g)及び10質量%炭酸水素ナトリウム水溶液(1,000g)を滴下して反応を停止した。通常の水系後処理(aqueous work-up)を行った。シリカゲルクロマトグラフィーによる精製を行った後、酢酸エチル及びn−ヘキサンにより再結晶を行い、クロロ酢酸エステル1(122g、2工程収率45%)を得た。IR及び1H-NMRスペクトルの結果を以下に示す。
IR(D-ATR): ν= 2985, 2966, 2888, 1749, 1406, 1397, 1384, 1371, 1311, 1276, 1201, 1183, 1160, 1149, 1127, 1046, 990, 968 cm-1.
1H-NMR (主異性体のみ記載、600MHz in DMSO-d6): δ= 4.61(1H, d), 4.33(2H, s), 2.87(1H, d), 2.47-2.52(1H, m), 2.45(1H, s), 2.05(1H, d), 1.83-1.88(1H, m), 1.41-1.48(2H, m), 1.31(6H, d), 1.15(1H, d) ppm.
メタクリル酸ナトリウム(45.6g)、ヨウ化ナトリウム3.3g及びジメチルホルムアミド200gの混合物に、実施例1−1−2で得たクロロ酢酸エステル1(100g)及びジメチルホルムアミド(150g)の混合物を、30℃以下にて滴下した。そのままの温度で8時間攪拌した。水400mLを30℃以下で加え、通常の後処理操作を行った。酢酸エチル及びn−ヘキサンより再結晶を行い、モノマー1(98.1g、収率83%)を得た。
IR(D-ATR): ν= 2977, 2884, 1751, 1731, 1635, 1424, 1388, 1362, 1299, 1276, 1261, 1227, 1185, 1149, 1126, 1066, 1053, 985, 970cm-1.
1H-NMR (主異性体のみ記載、600MHz in DMSO-d6): δ= 6.10(1H, s), 5.78(1H, m), 4.69(2H, s), 4.61(1H, d), 2.86(1H, d), 2.47-2.51(1H, m), 2.42(1H, s), 2.04(1H, d), 1.89(3H, s), 1.82-1.87(1H, m), 1.36-1.44(2H, m), 1.31(6H, d), 1.14(1H, d) ppm.
実施例1−1−1で得た粗ラクトン1(108g)及びギ酸(168g)の溶液を90℃に加熱し、メタンスルホン酸(2.9g)を滴下した。そのままの温度にて20時間攪拌した後、反応液を濃縮し、過剰のギ酸を留去した。粗体に酢酸エチル(500g)及び水(100g)を加え、通常の水系後処理(aqueous work-up)を行った。有機層を濃縮し、減圧蒸留により精製を行い、ギ酸エステル1(71g、2工程収率51%)を得た。
沸点:116−120℃/35Pa
蒸留ヘッドを取り付けた反応器に、実施例1−2−1で得たギ酸エステル1(53g)、メタノール(53g)及びナトリウムメトキシド(1.3g)を加え、混合物を70℃に加熱しながら攪拌した。反応の進行に伴って生じたギ酸メチルを系外へ留去した。3時間加熱攪拌還流した後、過剰のメタノールを留去した。5質量%塩酸30gを加え反応を停止した。通常の水系後処理(aqueous work-up)を行った。酢酸エチル及びn−ヘキサンにより再結晶を行い、ヒドロキシラクトン1(38g、収率82%)を得た。
IR(D-ATR): ν= 3471, 2976, 2941, 2892, 1726, 1373, 1337, 1292, 1271, 1256, 1184, 1141, 1125, 1073, 989, 972cm-1.
1H-NMR (主異性体のみ記載、600MHz in DMSO-d6): δ= 4.64(1H, d), 3.53(1H, m), 2.72(1H, d), 2.38(1H, d), 2.17(1H, s), 1.82(1H, d), 1.59-1.65(1H, m), 1.53(1H, d), 1.30(6H, d), 1.17-1.22(1H, m), 1.00(1H, d) ppm.
実施例1−2−2で得たヒドロキシラクトン1(6.3g)及び2−クロロ酢酸クロリド(4.3g)を、テトラヒドロフラン(25g)に溶解した。20℃以下にて、ピリジン(3.0g)を滴下した。室温で1時間攪拌した後、7質量%炭酸水素ナトリウム水溶液6.9gを加え、通常の後処理操作を行った。酢酸エチル及びn−ヘキサンにより精製を行い、クロロ酢酸エステル1(7.5g、収率86%)を得た。このものの物性データは実施例1−1−2とよく一致した。
蒸留ヘッドを取り付けた反応器に、実施例1−2−1で得たギ酸エステル1(22g)、クロロ酢酸メチル(22g)及びチタンン(IV)メトキシド(0.5g)を加え、混合物を100℃に加熱しながら攪拌した。反応の進行に伴って生じたギ酸メチルを系外へ留去した。20時間加熱攪拌還流した後、5質量%炭酸水素ナトリウム水溶液20gを加え反応を停止した。通常の水系後処理(aqueous work-up)を行った。酢酸エチル及びn−ヘキサンにより再結晶を行い、クロロ酢酸エステル1(20g、収率72%)を得た。このものの物性データは、実施例1−1−2とよく一致した。
実施例1−3−1で得たクロロ酢酸エステル1(27g)、ヨウ化ナトリウム1.5g、メタクリル酸(12g)及びジメチルホルムアミド(100g)の混合物に、トリエチルアミン(11g)を30℃以下にて滴下した。そのままの温度で8時間攪拌した。水150mLを30℃以下で加え、通常の後処理操作を行った。酢酸エチル及びn−ヘキサンより再結晶を行い、モノマー1(26.4g、収率82%)を得た。このものの物性データは、実施例1−1−3とよく一致した。
窒素雰囲気下、1.0mol/L塩化メチルマグネシウム−THF溶液(1,410mL)へ、酸無水物2(114g)をTHF(300g)に溶解した溶液を30℃以下で滴下した。そのままの温度にて5時間攪拌した後、10%塩酸(566g)を滴下して反応を停止し、通常の水系後処理(aqueous work-up)を行った。有機層を濃縮し、減圧蒸留により精製を行い、ラクトン2(102g、収率83%)を得た。
沸点:76−78℃/12Pa
ラクトン1をラクトン2に変更した以外は、実施例1−1−2と同様の方法でクロロ酢酸エステル2(収率54%)を得た。
1H-NMR (主異性体のみ記載、600MHz in DMSO-d6): δ= 4.69(1H, d), 4.33(2H, s), 2.32(2H, m), 2.16(1H, d), 2.08(1H, s), 1.93-2.03(2H, m), 1.59(1H, d), 1.46(1H, d), 1.32-1.39(6H, m), 1.30(2H, s) ppm.
クロロ酢酸エステル1をクロロ酢酸エステル2に変更した以外は、実施例1−1−3と同様の方法でモノマー2(収率91%)を得た。
IR(D-ATR): ν= 2973, 2872, 1749, 1723, 1636, 1447, 1421, 1389, 1376, 1298, 1274, 1216, 1156, 1110, 1061, 1044, 977, 937 cm-1.
1H-NMR (主異性体のみ記載、600MHz in DMSO-d6): δ= 6.09(1H, s), 5.77(1H, m), 2.26-2.33(2H, m), 2.15(1H, d), 2.08(1H, d), 1.93-2.02(2H, m), 1.89(3H, s), 1.59(1H, d), 1.42(1H, d), 1.32-1.38(6H, m), 1.30(2H, s) ppm.
各単量体の種類、配合比を変えた以外は、実施例2−1と同様の手順により、下記式で表されるレジストポリマー2〜11、及び比較例用の比較レジストポリマー1〜5を製造した。
レジストポリマー1〜11及び比較レジストポリマー1〜5をベース樹脂として用い、酸発生剤、クエンチャー、含フッ素ポリマー及び溶剤を表1〜3に示す組成で添加し、混合溶解後にそれらをテフロン(登録商標)製フィルター(孔径0.2μm)で濾過し、本発明のレジスト組成物(R−1〜R−24)及び比較例用のレジスト組成物(R−25〜R−31)を得た。なお、溶剤はすべて界面活性剤としてKH−20(旭硝子(株)製)を0.01質量%含むものを用いた。
S−2:GBL(γ−ブチロラクトン)
S−3:ジアセトンアルコール
表1〜3に示す組成で調製したレジスト組成物を、シリコンウエハーに信越化学工業(株)製スピンオンカーボン膜ODL-70(カーボンの含有量が65質量%)を200nm、その上にケイ素含有スピンオンハードマスクSHB-A940(ケイ素の含有量が43質量%)を35nmの膜厚で成膜したトライレイヤープロセス用の基板上にスピンコーティングし、ホットプレートを用いて200℃で60秒間ベークし、レジスト膜の厚みを100nmにした。これをArFエキシマレーザー液浸スキャナー((株)ニコン製、NSR-610C、NA1.30、σ0.9/0.72、クロスポール開口35度、Azimuthally偏光照明)により、6%ハーフトーン位相シフトマスクを用いて露光量を変化させながら露光を行い、露光後表4に示される温度で60秒間ベーク(PEB)し、現像ノズルから表4に示す現像液を3秒間30rpmで回転させながら吐出させ、その後静止パドル現像を27秒間行い、ピッチ100nmのホールパターンを得た。
形成したレジストパターンを(株)日立ハイテクノロジーズ製TDSEM(CG-4000)で観察し、100nmピッチにおいてホール径50nmとなる露光量を最適露光量(Eop、mJ/cm2)とした。
[焦点深度(DOF)マージン評価]
前記最適露光量におけるホール寸法を(株)日立ハイテクノロジーズ製TDSEM(CG-4000)で測定し、50nm±5nmになっているDOFマージンを求めた。この値が大きいほどDOFの変化に対するパターン寸法変化が小さく、DOFマージンが良好である。
[マスクエラーファクター(MEF)評価]
形成されたホールパターンを(株)日立ハイテクノロジーズ製TDSEM(CG-4000)で観察し、ホール直径を測定した。このとき、縮小投影後のホールパターンサイズ(nm)を横軸に、各マスクパターンを用いてレジスト膜に形成されたホール直径を縦軸にプロットしたときの直線の傾きを求め、MEFとした。このようにして求められるMEFは、その値が1に近いほどマスク再現性が良好であることを意味する。
各評価結果を表4に示す。
Claims (16)
- 下記式(1)で表される繰り返し単位を含む高分子化合物。
- (A)請求項1〜4のいずれか1項記載の高分子化合物を含むベース樹脂、(B)光酸発生剤、及び(C)溶剤を含むレジスト組成物。
- (B)光酸発生剤が、下記式(B−1)で表される光酸発生剤を含む請求項5記載のレジスト組成物。
(R8)(R9)N−R10− (i)
(式中、R8及びR9は、それぞれ独立に、水素原子、又はヘテロ原子で置換されていてもよい炭素数1〜20の1価炭化水素基を表す。R8とR9とは、互いに結合してこれらが結合する窒素原子と共に環を形成してもよい。R10は、ヘテロ原子を含んでいてもよい炭素数1〜20の2価炭化水素基を表す。)
で表される基を表す。Aは、水素原子又はトリフルオロメチル基を表す。R101、R102及びR103は、それぞれ独立に、置換若しくは非置換の炭素数1〜10の直鎖状若しくは分岐状のアルキル基、アルケニル基若しくはオキソアルキル基、又は置換若しくは非置換の炭素数6〜18のアリール基、アラルキル基若しくはアリールオキソアルキル基を表す。R101、R102及びR103のうちのいずれか2つは、互いに結合してこれらが結合する硫黄原子と共に環を形成してもよい。] - (B)光酸発生剤が、下記式(B−3)で表される光酸発生剤を含む請求項5〜7のいずれか1項記載のレジスト組成物。
(R8)(R9)N−R10− (i)
(式中、R8及びR9は、それぞれ独立に、水素原子、又はヘテロ原子で置換されていてもよい炭素数1〜20の1価炭化水素基を表す。R8とR9とは、互いに結合してこれらが結合する窒素原子と共に環を形成してもよい。R10は、ヘテロ原子を含んでいてもよい炭素数1〜20の2価炭化水素基を表す。)
で表される基を表す。R101、R102及びR103は、それぞれ独立に、置換若しくは非置換の炭素数1〜10の直鎖状若しくは分岐状のアルキル基、アルケニル基若しくはオキソアルキル基、又は置換若しくは非置換の炭素数6〜18のアリール基、アラルキル基若しくはアリールオキソアルキル基を表す。R101、R102及びR103のうちのいずれか2つは、互いに結合してこれらが結合する硫黄原子と共に環を形成してもよい。] - 更に、前記(A)高分子化合物とは異なる高分子化合物であって、下記式(D−1)〜(D−5)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(D)第2の高分子化合物を含む、請求項5〜8のいずれか1項記載のレジスト組成物。
−C(=O)−O−R17 (ii)
(式中、R17は、炭素数1〜20の直鎖状、分岐状又は環状のフッ素化炭化水素基を表す。)
で表される基を表す。R16は、炭素数1〜15の直鎖状、分岐状又は環状の1価炭化水素基又はフッ素化1価炭化水素基を表し、炭素−炭素結合間に、エーテル結合(−O−)又はカルボニル基(−C(=O)−)が含まれていてもよい。] - 請求項5〜9のいずれか1項記載のレジスト組成物を基板上に塗布する工程、加熱処理後、得られたレジスト膜をKrFエキシマレーザー、ArFエキシマレーザー、電子線又は極端紫外線で露光する工程、及び加熱処理した後、現像液を用いて現像する工程、を含むパターン形成方法。
- 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請求項10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屈折率1.0以上の液体を介在させて液浸露光を行う請求項10記載のパターン形成方法。
- 前記現像液が有機溶剤を含み、現像によってネガティブパターンを形成する請求項10〜12のいずれか1項記載のパターン形成方法。
- 下記式(8)で表される単量体。
- 下記式(9)で表される単量体。
- 下記式(10)で表される単量体。
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