JP2023102252A - ハードマスク組成物、ハードマスク層およびパターン形成方法 - Google Patents
ハードマスク組成物、ハードマスク層およびパターン形成方法 Download PDFInfo
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- JP2023102252A JP2023102252A JP2022166683A JP2022166683A JP2023102252A JP 2023102252 A JP2023102252 A JP 2023102252A JP 2022166683 A JP2022166683 A JP 2022166683A JP 2022166683 A JP2022166683 A JP 2022166683A JP 2023102252 A JP2023102252 A JP 2023102252A
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- 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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- 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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Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- 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
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/094—Multilayer resist systems, e.g. planarising layers
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- 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
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
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Abstract
Description
R1は、下記グループ1に列記される置換または非置換のモイエティのうちの少なくとも1種であり、
R2は、置換もしくは非置換の炭素数10~30の芳香族炭化水素環、または置換もしくは非置換の炭素数2~30のヘテロ芳香族環であり、
R3およびR4は、それぞれ独立して、置換または非置換の炭素数6~30の芳香族炭化水素環であり、
この際、R1~R4のうちの少なくとも1つはヒドロキシ基で置換されており、
pおよびqは、それぞれ独立して、0または1であり、
*は、連結地点である。
上記化学式1中のR2は、下記グループ2-2に列記される置換または非置換のモイエティのうちの少なくとも1種であり、
上記化学式1中のR3およびR4は、それぞれ独立して、置換または非置換の炭素数6~24の芳香族炭化水素環であり、
この際、R1~R4のうちの少なくとも1つはヒドロキシ基で置換されていることが好ましい。
R3およびR4は、それぞれ独立して、置換または非置換の炭素数6~30の芳香族炭化水素環であり、
pおよびqは、それぞれ独立して、0または1であり、
nおよびmは、それぞれ独立して、0~8の整数であり、
ただし、R3およびR4が全て非置換の炭素数6~30の芳香族炭化水素環である場合、n+mは0ではない。
また、本明細書で、重合体は、オリゴマー(oligomer)と重合体(polymer)とを全て含むことができる。
R1は、下記グループ1に列記される置換または非置換のモイエティのうちの少なくとも1種であり、
R2は、置換もしくは非置換の炭素数10~30の芳香族炭化水素環、または置換もしくは非置換の炭素数2~30のヘテロ芳香族炭化水素環であり、
R3およびR4は、それぞれ独立して、置換または非置換の炭素数6~30の芳香族炭化水素環であり、
この際、R1~R4のうちの少なくとも1つは、ヒドロキシ基で置換されており、
pおよびqは、それぞれ独立して、0または1であり、
*は、連結地点である。
(重合例1)
2リットルの三口フラスコに、1-メトキシピレン 23.2g、2-ナフトイルクロリド 19.1g、およびジクロロエタン 500gを入れ、攪拌棒(stirring bar)を使用して室温で1時間攪拌した。その後、トリクロロアルミニウム 20gを少しずつ投入した。その後、10時間攪拌して反応を行った。反応終了後、水を使用してトリクロロアルミニウムを除去した後、乾燥して、下記化学式1-2aで表される化合物を得た。
機械式攪拌機と冷却管とを備えた500mlの二口フラスコに、1-メトキシピレン 23g、1-ピレンカルボキシアルデヒド 23g、およびp-トルエンスルホン酸一水和物 19gを1,4-ジオキサン50gと共に入れ、よくかき混ぜた後に温度を105℃に上げて24時間攪拌した。反応終了後、内温を60~70℃に下げた後、テトラヒドロフラン 300gを入れて化合物が固まらないようにし、7質量%の重炭酸ナトリウム水溶液で化合物を含む混合液のpHを5~6に調整した。その後、酢酸エチル 1,000mlを注いで継続して攪拌した後に分液漏斗を用いて、有機層のみを抽出した。再び、水500mlを分液漏斗に入れ振って、残っている酸とナトリウム塩とを除去する工程を3回以上繰り返した後に、有機層を最終的に抽出した。その次に、有機溶液をエバポレーターで濃縮し、得られた重合体にテトラヒドロフラン 200gを添加して溶液を得た。溶液を、攪拌しているヘキサン 5Lが入っているビーカーに徐々に滴下して沈殿物を形成し、これをろ過して重合体を得た(Mw:1,700g/mol)。
1-ピレンカルボキシアルデヒド 23gの代わりに1-ベンゾペリレンカルボキシアルデヒド 30gを使用したことを除いては、重合例2と同様の方法で、下記化学式3-1で表される構造単位、下記化学式3-2で表される構造単位、またはこれらの組み合わせを含む重合体を得た(Mw:1,600g/mol)。
2-ナフトイルクロリド 19.1gの代わりに4-メトキシベンゾイルクロリド 19gを使用したこと以外は、重合例3と同様の方法で、下記化学式4-1aで表される構造単位、下記化学式4-2aで表される構造単位、またはこれらの組み合わせを含む重合体を得た。
機械式攪拌機と冷却管とを備えた500mlの二口フラスコに、1-ヒドロキシピレン 21g、1-ピレンカルボキシアルデヒド 23g、およびp-トルエンスルホン酸一水和物 9.5gを1,4-ジオキサン50gと共に入れ、よくかき混ぜた。その後、温度を100℃に上げて24時間攪拌した。反応終了後、内部温度を60~70℃に下げた後、テトラヒドロフラン300gを入れて化合物が固まらないようにし、7質量%の重炭酸ナトリウム水溶液を添加して、化合物のpHが5~6になるように調整した。酢酸エチル 1,000mlを注いで継続して攪拌した後、分液漏斗を用いて、有機層のみ抽出した。再び、水500mlを分液漏斗に入れ振って、残っている酸とナトリウム塩とを除去する工程を3回以上繰り返した後、有機層を最終的に抽出した。得られた有機溶液をエバポレーターで濃縮し、得られた化合物にテトラヒドロフラン 1Lを添加して溶液を得た。溶液を攪拌しているヘキサン5Lが入っているビーカーに徐々に滴下して、沈殿を形成させて、下記化学式5で表される構造単位を含む重合体を得た(Mw:1,500g/mol)。
重合例1で得られた化合物 5gを、シクロヘキサノン:プロピレングリコールモノメチルエーテルアセテート(1:1体積比)の混合物 50gと混合し、60分間攪拌した。その後、0.45μmテフロン(登録商標)フィルターでろ過して、ハードマスク組成物を製造した。
重合例1で得られた化合物の代わりに、重合例2で得られた化合物を使用したことを除いては、実施例1と同様の方法で、ハードマスク組成物を製造した。
重合例1で得られた化合物の代わりに、重合例3で得られた化合物を使用したことを除いては、実施例1と同様の方法で、ハードマスク組成物を製造した。
重合例1で得られた化合物の代わりに、重合例4で得られた化合物を使用したことを除いては、実施例1と同様の方法で、ハードマスク組成物を製造した。
重合例1で得られた化合物の代わりに、比較重合例1で得られた化合物を使用したことを除いては、実施例1と同様の方法で、ハードマスク組成物を製造した。
アンモニア水、過酸化水素水、および水を1:1:5の体積比率で混合して、SC1溶液を製造した。シリコンウェーハの上に、実施例1~実施例4、および比較例1によるハードマスク組成物を塗布し、400℃で2分間熱処理して厚さ200nmのハードマスク(有機膜)を形成した。シリコンウェーハを60℃で加熱したSC1溶液に5分間浸漬し、浸漬後の膜の厚さを測定して膜損失率(%)を測定した。
Claims (15)
- 下記化学式1で表される構造単位を含む重合体、および溶媒を含む、ハードマスク組成物:
前記化学式1中、
R1は、下記グループ1に列記される置換または非置換のモイエティのうちの少なくとも1種であり、
R2は、置換もしくは非置換の炭素数10~30の芳香族炭化水素環、または置換もしくは非置換の炭素数2~30のヘテロ芳香族炭化水素環であり、
R3およびR4は、それぞれ独立して、置換または非置換の炭素数6~30の芳香族炭化水素環であり、
この際、R1~R4のうちの少なくとも1つは、ヒドロキシ基で置換されており、
pおよびqは、それぞれ独立して、0または1であり、
*は、連結地点である。
- 前記グループ1で列記される置換または非置換のモイエティは、下記グループ1-1で列記される置換または非置換のモイエティのうちの少なくとも1種である、請求項1に記載のハードマスク組成物。
- 前記化学式1中のR2は、下記グループ2から選択される置換または非置換の芳香族炭化水素環のうちの少なくとも1種である、請求項1に記載のハードマスク組成物。
- 前記化学式1中のR3およびR4は、それぞれ独立して、下記グループ3から選択される置換もしくは非置換の芳香族炭化水素環のうちの少なくとも1種である、請求項1に記載のハードマスク組成物。
- 前記化学式1中のR2は、下記グループ2-1から選択される置換もしくは非置換の芳香族炭化水素環のうちの少なくとも1種である、請求項1に記載のハードマスク組成物。
- 前記化学式1中のR1は、下記グループ1-2に列記される置換または非置換のモイエティのうちの少なくとも1種であり、
前記化学式1中のR2は、下記グループ2-2に列記される置換または非置換のモイエティのうちの少なくとも1種であり、
前記化学式1中のR3およびR4は、それぞれ独立して、置換もしくは非置換の炭素数6~24の芳香族炭化水素環であり、
この際、R1~R4のうちの少なくとも1つは、ヒドロキシ基で置換されている、請求項1に記載のハードマスク組成物。
- 前記グループ1-2に列記される置換または非置換のモイエティのうちの少なくとも1種であるR1および前記グループ2-2に列記される置換または非置換のモイエティのうちの少なくとも1種であるR2は、それぞれ1つのヒドロキシ基で置換されているモイエティである、請求項6に記載のハードマスク組成物。
- 前記化学式1で表される構造単位は、下記化学式2で表される構造単位である、請求項1に記載のハードマスク組成物:
前記化学式2中、
R3およびR4は、それぞれ独立して、置換または非置換の炭素数6~30の芳香族炭化水素環であり、
pおよびqは、それぞれ独立して、0または1であり、
nおよびmは、それぞれ独立して、0~8の整数であり、
ただし、R3およびR4が全て非置換の炭素数6~30の芳香族炭化水素環である場合、n+mは0ではない。 - 前記化学式1で表される構造単位は、下記化学式1-1~化学式1-8で表される構造単位のうちの少なくとも1種である、請求項1に記載のハードマスク組成物。
- 前記重合体の重量平均分子量は1,000g/mol~200,000g/molである、請求項1に記載のハードマスク組成物。
- 前記重合体は、前記ハードマスク組成物の総質量を基準にして0.1質量%~30質量%の含有量で含まれる、請求項1に記載のハードマスク組成物。
- 前記溶媒は、プロピレングリコール、プロピレングリコールジアセテート、メトキシプロパンジオール、ジエチレングリコール、ジエチレングリコールブチルエーテル、トリ(エチレングリコール)モノメチルエーテル、プロピレングリコールモノメチルエーテル、プロピレングリコールモノメチルエーテルアセテート、シクロヘキサノン、エチルラクテート、γ-ブチロラクトン、N,N-ジメチルホルムアミド、N,N-ジメチルアセトアミド、メチルピロリドン、メチルピロリジノン、アセチルアセトン、およびエチル3-エトキシプロピオネートからなる群より選択される少なくとも1種である、請求項1に記載のハードマスク組成物。
- 請求項1~12のいずれか1項に記載のハードマスク組成物の硬化物を含む、ハードマスク層。
- 基板の上に材料層を形成する段階、
前記材料層の上に請求項1~12のいずれか1項に記載のハードマスク組成物を塗布する段階、
前記ハードマスク組成物を熱処理してハードマスク層を形成する段階、
前記ハードマスク層の上にフォトレジスト層を形成する段階、
前記フォトレジスト層を露光および現像してフォトレジストパターンを形成する段階、
前記フォトレジストパターンを用いて前記ハードマスク層を選択的に除去し前記材料層の一部を露出させる段階、ならびに
前記材料層の露出された部分をエッチングする段階、
を含む、パターン形成方法。 - 前記ハードマスク層を形成する段階は、100℃~1,000℃で熱処理する段階を含む、請求項14に記載のパターン形成方法。
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