JP6800105B2 - 有機膜形成用組成物、パターン形成方法、及び有機膜形成用樹脂 - Google Patents
有機膜形成用組成物、パターン形成方法、及び有機膜形成用樹脂 Download PDFInfo
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- JP6800105B2 JP6800105B2 JP2017142216A JP2017142216A JP6800105B2 JP 6800105 B2 JP6800105 B2 JP 6800105B2 JP 2017142216 A JP2017142216 A JP 2017142216A JP 2017142216 A JP2017142216 A JP 2017142216A JP 6800105 B2 JP6800105 B2 JP 6800105B2
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- 0 CCCCc(c(C1(C2(c3cc(-c4c(C5(C(C)(C)C)O)cccc4)c5cc3-c3c2cccc3)O)O)c(cc2C3(C(C)(C)*)O)-c4c1cccc4)c2-c1c3cccc1 Chemical compound CCCCc(c(C1(C2(c3cc(-c4c(C5(C(C)(C)C)O)cccc4)c5cc3-c3c2cccc3)O)O)c(cc2C3(C(C)(C)*)O)-c4c1cccc4)c2-c1c3cccc1 0.000 description 4
- YIJGYROPOSEXTL-DAXSKMNVSA-N Cc1c(/C=C\C=C)ccc2ccccc12 Chemical compound Cc1c(/C=C\C=C)ccc2ccccc12 YIJGYROPOSEXTL-DAXSKMNVSA-N 0.000 description 1
- UFWIBTONFRDIAS-UHFFFAOYSA-N c1cc2ccccc2cc1 Chemical compound c1cc2ccccc2cc1 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 1
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Description
(I)繰り返し単位の少なくとも一部に、下記一般式(1)で示される、芳香環を含む環構造ARと、4個の前記ARと結合したスピロ構造SPとが交互に繰り返される構造を含む樹脂と、
(II)有機溶剤と、
を含有するものである有機膜形成用組成物を提供する。
本発明の有機膜形成用樹脂は、繰り返し単位の少なくとも一部に、一般式(1)で示される、芳香環を含む環構造ARと、4個の該ARと結合したスピロ構造SPとが交互に繰り返される構造を含むものである。
本発明の有機膜形成用樹脂に含まれる芳香環を含む環構造(AR)は、以下の式(1−2)〜(1−7)のいずれかの構造式で示される構造である。
ここで、本発明の有機膜形成用樹脂の製造方法の一例として、下記の工程を含む製造方法を挙げることが出来るが、これに限定されない。
一つの分子内に2個の芳香環と縮合した5員環ケトンを2個以上含有する化合物である出発物質(0−1)を原料にして、アルカリ金属やアルカリ土類金属による1電子還元反応(0−2)を経由するピナコールカップリング反応によりポリオール化合物(0−3)を製造する。
スピロケトン化合物(0−4)の製造方法の別法として、下記のように一つの分子内に2個の芳香環と縮合した5員環ケトンを2個以上含有する化合物である出発物質(0−1)を亜リン酸化合物と反応させることにより直接スピロケトン化合物(0−4)を製造することも可能である。
本発明の有機膜形成用組成物は、
(I)先述した、繰り返し単位の少なくとも一部に、一般式(1)で示される、芳香環を含む環構造ARと、4個の該ARと結合したスピロ構造SPとが交互に繰り返される構造を含む樹脂と、
(II)有機溶剤とを含有するものである。
[ケイ素含有レジスト下層膜を用いた3層レジストプロセス]
本発明では、被加工体上に上述の本発明の有機膜形成用組成物を用いて有機膜を形成し、該有機膜の上にケイ素原子を含有する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からなるレジスト上層膜材料を用いてレジスト上層膜を形成し、該レジスト上層膜に回路パターンを形成し、該回路パターンが形成されたレジスト上層膜をマスクにして前記レジスト下層膜にエッチングでパターンを転写し、該パターンが転写されたレジスト下層膜をマスクにして前記有機膜にエッチングでパターンを転写し、更に、該パターンが転写された有機膜をマスクにして前記被加工体にエッチングでパターンを転写するパターン形成方法を提供する。
また、本発明では、被加工体上に上述の本発明の有機膜形成用組成物を用いて有機膜を形成し、該有機膜の上にケイ素原子を含有する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有機反射防止膜を形成し、該有機反射防止膜上にフォトレジスト組成物からなるレジスト上層膜材料を用いてレジスト上層膜を形成し、該レジスト上層膜に回路パターンを形成し、該回路パターンが形成されたレジスト上層膜をマスクにして前記有機反射防止膜と前記レジスト下層膜にエッチングでパターンを転写し、該パターンが転写されたレジスト下層膜をマスクにして前記有機膜にエッチングでパターンを転写し、更に、該パターンが転写された有機膜をマスクにして前記被加工体にエッチングでパターンを転写するパターン形成方法を提供する。
また、本発明では、上述の本発明の有機膜形成用組成物を用いた3層レジストプロセスによるパターン形成方法として、被加工体上に上述の本発明の有機膜形成用組成物を用いて有機膜を形成し、該有機膜の上にケイ素酸化膜、ケイ素窒化膜、及びケイ素酸化窒化膜から選ばれる無機ハードマスクを形成し、該無機ハードマスクの上にフォトレジスト組成物からなるレジスト上層膜材料を用いてレジスト上層膜を形成し、該レジスト上層膜に回路パターンを形成し、該回路パターンが形成されたレジスト上層膜をマスクにして前記無機ハードマスクにエッチングでパターンを転写し、該パターンが転写された無機ハードマスクをマスクにして前記有機膜にエッチングでパターンを転写し、更に、該パターンが転写された有機膜をマスクにして前記被加工体にエッチングでパターンを転写するパターン形成方法を提供する。
また、本発明では、上述の本発明の有機膜形成用組成物を用いた4層レジストプロセスによるパターン形成方法として、被加工体上に上述の本発明の有機膜形成用組成物を用いて有機膜を形成し、該有機膜の上にケイ素酸化膜、ケイ素窒化膜、及びケイ素酸化窒化膜から選ばれる無機ハードマスクを形成し、該無機ハードマスクの上に有機反射防止膜を形成し、該有機反射防止膜上にフォトレジスト組成物からなるレジスト上層膜材料を用いてレジスト上層膜を形成し、該レジスト上層膜に回路パターンを形成し、該回路パターンが形成されたレジスト上層膜をマスクにして前記有機反射防止膜と前記無機ハードマスクにエッチングでパターンを転写し、該パターンが転写された無機ハードマスクをマスクにして前記有機膜にエッチングでパターンを転写し、更に、該パターンが転写された有機膜をマスクにして前記被加工体にエッチングでパターンを転写するパターン形成方法を提供する。
(合成例1−1:ポリオール化合物(K´−1)の合成)
(合成例2−1:ポリケトン化合物(K´´−2)の合成)
(合成例3−1:ポリケトン化合物(K´´−3)の合成)
(合成例4−1:ポリケトン化合物(K´´−4)の合成)
上記で調製したレジスト下層膜材料(UDL−1〜6、CUDL−1〜3)をシリコン基板上に塗布し、表3に記載の条件でベークして、それぞれ膜厚200nmの塗布膜を形成した。これらの膜につき、東陽テクニカ社製ナノインデンターSA2型装置でナノインデンテーション試験を行い、上記塗布膜のハードネスを測定した。その結果も表3に示す。
(CF4/CHF3系ガスでのエッチング試験)
UDL−1〜6、CUDL−1〜3をシリコン基板上に塗布して、空気雰囲気下、表4に示す温度でそれぞれ60秒間ベークした。それぞれ膜厚200nmの下層膜を形成し、下記条件でCF4/CHF3系ガスでのエッチング試験を行った。またこのとき、東京エレクトロン株式会社製ドライエッチング装置TE−8500を用い、エッチング前後のポリマー膜の膜厚差を求めた。結果を表4に併せて示す。
チャンバー圧力 40.0Pa
RFパワー 1,000W
CHF3ガス流量 10ml/min
CF4ガス流量 100ml/min
Heガス流量 200ml/min
時間 20sec
CF4/CHF3系ガスでのエッチング試験と同様に、UDL−1〜6、CUDL−1〜3をシリコン基板上に塗布して、空気雰囲気下、表4に示す温度でそれぞれ60秒間ベークした。それぞれ膜厚200nmの下層膜を形成し、下記条件でO2系ガスでのエッチング試験を行った。またこのとき、東京エレクトロン株式会社製ドライエッチング装置TE−8500を用い、エッチング前後のポリマー膜の膜厚差を求めた。結果を表4に併せて示す。
チャンバー圧力 40.0Pa
RFパワー 100W
O2ガス流量 30ml/min
N2ガス流量 70ml/min
時間 60sec
(パターンエッチング試験)
有機膜形成用組成物(UDL−1〜6、CUDL−1〜3)を、膜厚200nmのSiO2膜が形成された直径300mmSiウェハー基板上に塗布して、表7に示す焼成温度で膜厚200nmのレジスト下層膜を形成した。その上にケイ素含有レジスト中間層材料SOG−1を塗布して220℃で60秒間ベークして膜厚35nmのレジスト中間層膜を形成し、レジスト上層膜材料(ArF用SLレジスト溶液)を塗布し、105℃で60秒間ベークして膜厚100nmのレジスト上層膜を形成した。レジスト上層膜に液浸保護膜(TC−1)を塗布し90℃で60秒間ベークし膜厚50nmの保護膜を形成した。上層レジストとしては、表5に示す組成の樹脂、酸発生剤、塩基化合物をFC−430(住友スリーエム(株)製)0.1質量%を含む溶媒中に溶解させ、0.1μmのフッ素樹脂製のフィルターで濾過することによって調製した。
・レジストパターンのSOG膜への転写条件
チャンバー圧力 10.0Pa
RFパワー 1,500W
CF4ガス流量 15sccm
O2ガス流量 75sccm
時間 15sec
チャンバー圧力 2.0Pa
RFパワー 500W
Arガス流量 75sccm
O2ガス流量 45sccm
時間 120sec
チャンバー圧力 2.0Pa
RFパワー 2,200W
C5F12ガス流量 20sccm
C2F6ガス流量 10sccm
Arガス流量 300sccm
O2 60sccm
時間 90sec
(埋め込み特性の評価)
厚さ500nmで直径が160nmの密集ホールパターンが形成されているSiO2段差基板上に、レジスト下層膜材料UDL−1〜6を、平坦な基板上で80nmの膜厚になるような条件で塗布し、塗布後、表8に示す焼成条件でレジスト下層膜を形成した。レジスト下層膜を形成した基板を割断し、ホールの底までレジスト下層膜が埋め込まれているかどうかを走査型電子顕微鏡(SEM)で観察した結果を表8に示す。
3…有機膜、 3a…有機膜パターン、 4…ケイ素含有レジスト下層膜、
4a…ケイ素含有レジスト下層膜パターン、 5…レジスト上層膜、
5a…レジスト上層膜パターン、 6…露光部分。
Claims (12)
- (I)繰り返し単位の少なくとも一部に、下記一般式(1)で示される、芳香環を含む環構造ARと、4個の前記ARと結合したスピロ構造SPとが交互に繰り返される構造を含む樹脂と、
(II)有機溶剤と、
を含有するものであることを特徴とする有機膜形成用組成物。
- 前記有機膜形成用組成物が、更に、酸発生剤を含有するもの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。
- 被加工体上に請求項1又は請求項2に記載の有機膜形成用組成物を用いて有機膜を形成し、該有機膜の上にケイ素含有レジスト下層膜材料を用いてケイ素含有レジスト下層膜を形成し、該ケイ素含有レジスト下層膜の上にフォトレジスト組成物を用いてレジスト上層膜を形成し、該レジスト上層膜に回路パターンを形成し、該回路パターンが形成されたレジスト上層膜をマスクにして前記ケイ素含有レジスト下層膜にエッチングでパターン転写し、該パターンが転写されたケイ素含有レジスト下層膜をマスクにして前記有機膜にエッチングでパターン転写し、更に、該パターンが転写された有機膜をマスクにして前記被加工体にエッチングでパターンを転写することを特徴とするパターン形成方法。
- 被加工体上に請求項1又は請求項2に記載の有機膜形成用組成物を用いて有機膜を形成し、該有機膜の上にケイ素含有レジスト下層膜材料を用いてケイ素含有レジスト下層膜を形成し、該ケイ素含有レジスト下層膜の上に有機反射防止膜を形成し、該有機反射防止膜上にフォトレジスト組成物を用いてレジスト上層膜を形成して4層膜構造とし、該レジスト上層膜に回路パターンを形成し、該回路パターンが形成されたレジスト上層膜をマスクにして前記有機反射防止膜と前記ケイ素含有レジスト下層膜にエッチングでパターン転写し、該パターンが転写されたケイ素含有レジスト下層膜をマスクにして前記有機膜にエッチングでパターン転写し、更に、該パターンが転写された有機膜をマスクにして前記被加工体にエッチングでパターンを転写することを特徴とするパターン形成方法。
- 被加工体上に請求項1又は請求項2に記載の有機膜形成用組成物を用いて有機膜を形成し、該有機膜の上にケイ素酸化膜、ケイ素窒化膜、及びケイ素酸化窒化膜から選ばれる無機ハードマスク中間膜を形成し、該無機ハードマスク中間膜の上にフォトレジスト組成物を用いてレジスト上層膜を形成し、該レジスト上層膜に回路パターンを形成し、該回路パターンが形成されたレジスト上層膜をマスクにして前記無機ハードマスク中間膜にエッチングでパターン転写し、該パターンが形成された無機ハードマスク中間膜をマスクにして前記有機膜にエッチングでパターン転写し、更に、該パターンが形成された有機膜をマスクにして前記被加工体にエッチングでパターンを転写することを特徴とするパターン形成方法。
- 被加工体上に請求項1又は請求項2に記載の有機膜形成用組成物を用いて有機膜を形成し、該有機膜の上にケイ素酸化膜、ケイ素窒化膜、及びケイ素酸化窒化膜から選ばれる無機ハードマスク中間膜を形成し、該無機ハードマスク中間膜の上に有機反射防止膜を形成し、該有機反射防止膜上にフォトレジスト組成物を用いてレジスト上層膜を形成して4層膜構造とし、該レジスト上層膜に回路パターンを形成し、該回路パターンが形成されたレジスト上層膜をマスクにして前記有機反射防止膜と前記無機ハードマスク中間膜にエッチングでパターン転写し、該パターンが形成された無機ハードマスク中間膜をマスクにして前記有機膜にエッチングでパターン転写し、更に、該パターンが形成された有機膜をマスクにして前記被加工体にエッチングでパターンを転写することを特徴とするパターン形成方法。
- 前記無機ハードマスク中間膜を、CVD法又はALD法によって形成することを特徴とする請求項5又は請求項6に記載のパターン形成方法。
- 前記レジスト上層膜に回路パターンを形成する方法として、波長が10nm以上300nm以下の光を用いた光リソグラフィー、電子線による直接描画、ナノインプリンティング、又はこれらの組み合わせによってパターンを形成することを特徴とする請求項3から請求項7のいずれか一項に記載のパターン形成方法。
- 前記レジスト上層膜に回路パターンを形成する際に、アルカリ現像又は有機溶剤によって回路パターンを現像することを特徴とする請求項3から請求項8のいずれか一項に記載のパターン形成方法。
- 前記被加工体として、半導体装置基板、あるいは該半導体装置基板に金属膜、金属炭化膜、金属酸化膜、金属窒化膜、金属酸化炭化膜、及び金属酸化窒化膜のいずれかが成膜されたものを用いることを特徴とする請求項3から請求項9のいずれか一項に記載のパターン形成方法。
- 前記被加工体を構成する金属が、ケイ素、チタン、タングステン、ハフニウム、ジルコニウム、クロム、ゲルマニウム、銅、銀、金、アルミニウム、インジウム、ガリウム、ヒ素、パラジウム、鉄、タンタル、イリジウム、モリブデン、又はこれらの合金であることを特徴とする請求項10に記載のパターン形成方法。
- 繰り返し単位の少なくとも一部に、下記一般式(1)で示される、芳香環を含む環構造ARと、4個の前記ARと結合したスピロ構造SPとが交互に繰り返される構造を含むものであることを特徴とする有機膜形成用樹脂。
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