JP6165690B2 - 有機膜形成用組成物の製造方法 - Google Patents
有機膜形成用組成物の製造方法 Download PDFInfo
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- JP6165690B2 JP6165690B2 JP2014169865A JP2014169865A JP6165690B2 JP 6165690 B2 JP6165690 B2 JP 6165690B2 JP 2014169865 A JP2014169865 A JP 2014169865A JP 2014169865 A JP2014169865 A JP 2014169865A JP 6165690 B2 JP6165690 B2 JP 6165690B2
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- 239000004645 polyester resin Substances 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229940079877 pyrogallol Drugs 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- ZMHIRZUZAFAMAX-UHFFFAOYSA-N spiro[1,2,7,7a-tetrahydroindene-3,1'-indene] Chemical group C12=CC=CCC2CCC11C2=CC=CC=C2C=C1 ZMHIRZUZAFAMAX-UHFFFAOYSA-N 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical compound OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 150000003739 xylenols Chemical class 0.000 description 1
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Description
(1)芳香族骨格を有する化合物を酸で洗浄する工程、
(2)前記洗浄された化合物を含む組成物溶液を調製する工程、
(3)前記調製された組成物溶液をフィルターでろ過する工程、
(4)前記ろ過された組成物溶液を有機樹脂製容器に充填する工程、
を含む有機膜形成用組成物の製造方法を提供する。
このため、本発明の方法で製造される有機膜形成用組成物をレジスト下層膜形成用組成物として適用して、レジスト下層膜を形成すると、ドライエッチング時に欠陥のないパターン転写が可能である。従って、多層レジスト法における、特に、液浸露光、ダブルパターニング、有機溶剤現像などに好適に使用でき、最終的には、半導体装置の製造上の歩留まりを改善することができる。
(1)芳香族骨格を有する化合物を酸で洗浄する工程、
(2)前記洗浄された化合物を含む組成物溶液を調製する工程、
(3)前記調製された組成物溶液をフィルターでろ過する工程、
(4)前記ろ過された組成物溶液を有機樹脂製容器に充填する工程、
を含む有機膜形成用組成物の製造方法である。
より具体的には、特開2014−29435号公報に記載の下記式(17)で表される単位構造を含むポリマーを例示できる。
より具体的には、下記一般式(23−1)及び/又は(23−2)で示される1種類以上の化合物と、下記一般式(24−1)及び/又は(24−2)で示される1種類以上の化合物及び/又はその等価体とを縮合することにより得られるポリマーを例示できる。
なお、分子量として、ゲルパーミエーションクロマトグラフィー(GPC)によるポリスチレン換算の重量平均分子量(Mw)及び数平均分子量(Mn)を求め、それらから分散度(Mw/Mn)を導いた。
(合成例1)
1,000mlのフラスコに1,5−ジヒドロキシナフタレン160.2g(1.00mol)、37%ホルムアルデヒド溶液56.8g(ホルムアルデヒド0.70mol相当)、メチルセロソルブ320gを加え、70℃で撹拌しながら20質量%パラトルエンスルホン酸メチルセロソルブ溶液20gを添加した。温度を85℃に上げ6時間撹拌後、室温に冷却し、メチルイソブチルケトン350mlで希釈した。分液ロートに移し変え、脱イオン水200mlで洗浄し、反応触媒のパラトルエンスルホン酸を除去した。次いで、表1に記載の条件で酸洗浄、脱イオン水による洗浄を行った。得られた溶液を減圧濃縮した後、残渣に酢酸エチル400mlを加え、ヘキサン2,400mlでポリマーを沈殿させた。沈殿したポリマーをろ別、回収後、減圧乾燥してポリマー1を得た。
分子量(Mw)=4,200
分散度(Mw/Mn)=3.35
1,000mlのフラスコに1,5−ジヒドロキシナフタレン80g(0.50mol)、2−ヒドロキシ−6−ナフトアルデヒド51.6g(0.30mol)、メチルセロソルブ300gを加え、70℃で撹拌しながら20質量%パラトルエンスルホン酸メチルセロソルブ溶液20gを添加した。温度を85℃に上げ6時間撹拌後、室温に冷却し、メチルイソブチルケトン600mlで希釈した。分液ロートに移し変え、脱イオン水200mlで洗浄し、反応触媒のパラトルエンスルホン酸を除去した。次いで、表1に記載の条件で酸洗浄、脱イオン水による洗浄を行った。得られた溶液を減圧濃縮した後、残渣に酢酸エチル300mlを加え、ヘキサン1,800mlでポリマーを沈殿させた。沈殿したポリマーをろ別、回収後、減圧乾燥してポリマー2を得た。
分子量(Mw)=3,500
分散度(Mw/Mn)=2.54
300mlのフラスコに1−ナフトール144.2g(1.0mol)、トリフルオロメタンスルホン酸0.01gを加え、50℃で撹拌しながらジシクロペンタジエン79.3g(0.6mol)を1時間滴下した。同温度で1時間撹拌後、150℃にまで昇温、2時間撹拌し、反応を終了させた。未反応物を減圧蒸留で除去し、200gの1,2−ジクロロエタンに溶解させ、表1に記載の条件で酸洗浄、脱イオン水による洗浄を行った。1,2−ジクロロエタンを減圧除去することによってポリマー3を得た。
分子量(Mw)=1,100
分散度(Mw/Mn)=2.86
1,000mlのフラスコに9,9−ビス[6−(2−ヒドロキシナフチル)]フルオレン225.3g(0.50mol)、37%ホルムアルデヒド溶液28.4g(ホルムアルデヒド0.35mol相当)、メチルセロソルブ500gを加え、80℃で撹拌しながら20質量%パラトルエンスルホン酸メチルセロソルブ溶液20gを添加した。温度を120℃に上げ6時間撹拌後、室温に冷却し、メチルイソブチルケトン1,000mlで希釈した。分液ロートに移し変え、脱イオン水200mlで洗浄し、反応触媒のパラトルエンスルホン酸を除去した。次いで、表1に記載の条件で酸洗浄、脱イオン水による洗浄を行った。得られた溶液を減圧濃縮した後、残渣に酢酸エチル400mlを加え、ヘキサン2,400mlでポリマーを沈殿させた。沈殿したポリマーをろ別、回収後、減圧乾燥してポリマー4を得た。
分子量(Mw)=4,300
分散度(Mw/Mn)=4.30
1,000mlのフラスコに9,9−ビス(4−ヒドロキシフェニル)フルオレン175.2g(0.50mol)、4−ヒドロキシベンズアルデヒド45.8g(0.38mol)、1−メトキシプロパノール450gを加え、80℃で撹拌しながら20質量%パラトルエンスルホン酸1−メトキシプロパノール溶液20gを添加した。温度を130℃に上げ12時間撹拌後、室温に冷却し、メチルイソブチルケトン900mlで希釈した。分液ロートに移し変え、脱イオン水200mlで洗浄し、反応触媒のパラトルエンスルホン酸を除去した。次いで、表1に記載の条件で酸洗浄、脱イオン水による洗浄を行った。得られた溶液を減圧濃縮した後、残渣に酢酸エチル450mlを加え、ヘキサン2,700mlでポリマーを沈殿させた。沈殿したポリマーをろ別、回収後、減圧乾燥してポリマー5を得た。
分子量(Mw)=4,200
分散度(Mw/Mn)=3.34
1,000mlのフラスコに2,2’−ジナフチルエーテル30.0g(0.11mol)、9−フルオレノン20.0g(0.11mol)、1,2−ジクロロエタン120mlを加え、70℃で撹拌しながら3−メルカプトプロピオン酸0.6ml、メタンスルホン酸6.0mlを滴下し、温度を上げ還流下で13時間反応を行った。室温に冷却し、メチルイソブチルケトン500mlで希釈した。分液ロートに移し変え、脱イオン水100mlで洗浄し、酸触媒を除去した。次いで、表1に記載の条件で酸洗浄、脱イオン水による洗浄を行った。得られた溶液を減圧濃縮した後残渣にテトラヒドロフラン(THF)250mlを加え、メタノール1500mlでポリマーを沈殿させた。沈殿したポリマーをろ別、回収後、減圧乾燥してポリマー6を得た。
分子量(Mw)=3,100
分散度(Mw/Mn)=2.10
1,000mlフラスコにカルバゾール100g(598mmol)、ベンズアルデヒド64.1g(604mmol)、パラトルエンスルホン酸一水和物11.9g(62.6mmol)を加えた。更に1,4−ジオキサン150gを加え、撹拌しながら100℃まで昇温し、2時間重合反応を行った。反応終了後、60℃まで放冷し、メチルイソブチルケトン500mlを加え希釈した。分液ロートに移し変え、脱イオン水200mlで洗浄し、反応触媒のパラトルエンスルホン酸を除去した。次いで、表1に記載の条件で酸洗浄、脱イオン水による洗浄を行った。得られた溶液を減圧濃縮した後、残渣にクロロホルム450mlを加え、メタノール2,500mlでポリマーを沈殿させた。沈殿したポリマーをろ別、回収後、減圧乾燥してポリマー7を得た。
分子量(Mw)=4,200
分散度(Mw/Mn)=1.75
合成例1と同様の方法でポリマーの合成を行いパラトルエンスルホン酸を除去した。次いで、表1の合成例8に記載の条件で酸洗浄、脱イオン水による洗浄を行った。得られた溶液を減圧濃縮した後、残渣に酢酸エチル400mlを加え、ヘキサン2,400mlでポリマーを沈殿させた。沈殿したポリマーをろ別、回収後、減圧乾燥してポリマー1Aを得た。
分子量(Mw)=4,100
分散度(Mw/Mn)=3.30
合成例1と同様の方法でポリマーの合成を行いパラトルエンスルホン酸を除去した。次いで、表1の合成例9に記載の条件で酸洗浄、脱イオン水による洗浄を行った。得られた溶液を減圧濃縮した後、残渣に酢酸エチル400mlを加え、ヘキサン2,400mlでポリマーを沈殿させた。沈殿したポリマーをろ別、回収後、減圧乾燥してポリマー1Bを得た。
分子量(Mw)=4,200
分散度(Mw/Mn)=3.40
合成例1と同様の方法でポリマーの合成を行いパラトルエンスルホン酸を除去した。次いで、表1に記載のように酸洗浄をせず、脱イオン水による洗浄だけを行った。得られた溶液を減圧濃縮した後、残渣に酢酸エチル400mlを加え、ヘキサン2,400mlでポリマーを沈殿させた。沈殿したポリマーをろ別、回収後、減圧乾燥してポリマー1Cを得た。
分子量(Mw)=4,100
分散度(Mw/Mn)=3.30
(組成物溶液(SOL−1〜10)の製造)
1%フッ酸で3回洗浄したポリエチレン製200mlビンに、上記の合成例で得られたポリマー1〜7、1A、1B及び1Cを20g、下記酸発生剤AG1を1g、下記架橋剤CR1を4g、FC−430(住友スリーエム社製)0.1質量%を含むプロピレングリコールモノメチルエーテルアセテート100gを混ぜ、マグネチックススターラーで充分かき混ぜて均一化して組成物溶液を調製した。次いで、調製された組成物溶液をそれぞれ0.1μmのフッ素樹脂製のフィルターで濾過し、組成物溶液(SOL−1〜10)を製造した。得られた組成物溶液は、ポリエチレン製ビンに充填した。
(組成物溶液(SOL−1X)の製造)
市販の茶色ガラス製200mlビンにポリマー1を用いて、上記と同様の方法で組成物溶液(SOL−1X)を製造した。得られた組成物溶液は、茶色ガラス製ビンに充填した。
膜厚100nmの熱酸化膜が形成されているシリコンウエハー上に、(SOL−1〜10、1X)を塗布し350℃で60秒間加熱して、膜厚200nmの有機下層膜(S−1〜10、1X)を形成した。次に、その上に下記のケイ素含有レジスト下層膜材料(SOG1)を塗布し240℃で60秒間加熱して、膜厚35nmのケイ素含有膜を形成した。続いて、表2に記載のポジ現像用ArFレジスト溶液(PR−1)を塗布し110℃で60秒間加熱して、膜厚100nmのフォトレジスト膜を形成した。更にフォトレジスト膜上に表3に記載の液浸保護膜材料(TC−1)を塗布し90℃で60秒間加熱して、膜厚50nmの保護膜を形成した。
上記のパターニング試験で形成したレジストパターンをマスクにしてドライエッチングでパターンを転写した。下記のエッチング条件(1)でドライエッチングしてケイ素含有膜にパターンを転写し、次いで下記のエッチング条件(2)でドライエッチングして有機下層膜にパターンを転写し、更に下記のエッチング条件(3)でドライエッチングして熱酸化膜にパターンを転写した。得られたパターンの断面形状を(株)日立製作所製電子顕微鏡(S−9380)で観測し、パターン欠陥をKLA−Tencor社製明視野欠陥検査装置KLA2800で観測した。その結果を表5に示す。
装置:東京エレクトロン(株)製ドライエッチング装置TeliusSP
エッチング条件(1):
チャンバー圧力 15Pa
Upper/LowerRFパワー 500W/300W
CHF3ガス流量 50ml/min
CF4ガス流量 150ml/min
処理時間 40sec
装置:東京エレクトロン(株)製ドライエッチング装置TeliusSP
エッチング条件(2):
チャンバー圧力 2Pa
Upper/LowerRFパワー 1000W/300W
CO2ガス流量 320ml/min
N2ガス流量 80ml/min
処理時間 30sec
装置:東京エレクトロン(株)製ドライエッチング装置TeliusSP
エッチング条件(3):
チャンバー圧力 20Pa
Upper/LowerRFパワー 500W/300W
CHF3ガス流量 30ml/min
CF4ガス流量 170ml/min
処理時間 40sec
Claims (9)
- 半導体装置の製造工程で使用される有機膜形成用組成物の製造方法であって、
(1)芳香族骨格を有する化合物を酸で洗浄する工程、
(2)前記洗浄された化合物を含む組成物溶液を調製する工程、
(3)前記調製された組成物溶液をフィルターでろ過する工程、
(4)前記ろ過された組成物溶液を有機樹脂製容器に充填する工程、
を含み、
前記酸で洗浄する工程において、ハロゲン酸を含む酸溶液で1回以上洗浄し、かつ、硝酸を含む酸溶液で1回以上洗浄することを特徴とする有機膜形成用組成物の製造方法。 - 前記芳香族骨格が、ベンゼン、フルオレン、カルバゾール、ナフタレン、及びアントラセンのいずれかであることを特徴とする請求項1に記載の有機膜形成用組成物の製造方法。
- 前記芳香族骨格を有する化合物が、フェノール誘導体又はナフトール誘導体を重合させて得られるものであることを特徴とする請求項1又は請求項2に記載の有機膜形成用組成物の製造方法。
- 前記芳香族骨格を有する化合物が、フェノール誘導体又はナフトール誘導体とアルデヒド誘導体とを重合させて得られるものであることを特徴とする請求項1から請求項3のいずれか一項に記載の有機膜形成用組成物の製造方法。
- 前記洗浄された化合物中のケイ素原子の含有量が、100ppb以下であることを特徴とする請求項1から請求項4のいずれか一項に記載の有機膜形成用組成物の製造方法。
- 前記洗浄された化合物中の鉄原子の含有量が、1ppb以下であることを特徴とする請求項1から請求項5のいずれか一項に記載の有機膜形成用組成物の製造方法。
- 前記酸で洗浄する工程において、ハロゲン酸と硝酸を含む混合酸溶液で1回以上洗浄することを特徴とする請求項1から請求項6のいずれか一項に記載の有機膜形成用組成物の製造方法。
- 前記ハロゲン酸が、フッ酸又は塩酸であることを特徴とする請求項1から請求項7のいずれか一項に記載の有機膜形成用組成物の製造方法。
- 前記フィルターの基材が、ナイロン、ポリエチレン、ポリプロピレン、ポリスチレン、及びフッ素樹脂から選ばれる1種以上を含むことを特徴とする請求項1から請求項8のいずれか一項に記載の有機膜形成用組成物の製造方法。
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JP6004172B2 (ja) | 2012-07-31 | 2016-10-05 | 日産化学工業株式会社 | カルボニル基含有カルバゾールノボラックを含むリソグラフィー用レジスト下層膜形成組成物 |
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