JP2017155222A - 光酸発生モノマー、それから誘導されるポリマー、そのポリマーを含むフォトレジスト組成物、及びそのフォトレジスト組成物を使用してフォトレジストレリーフ像を形成する方法 - Google Patents
光酸発生モノマー、それから誘導されるポリマー、そのポリマーを含むフォトレジスト組成物、及びそのフォトレジスト組成物を使用してフォトレジストレリーフ像を形成する方法 Download PDFInfo
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Abstract
Description
高度なリソグラフィー技術、例えば電子ビーム及び極紫外線(EUV)リソグラフィーが、微細パターンを形成するために使用されている。パターンサイズを25ナノメートル以下にさらに縮小するには、他のプロセス及びツールに関連する要件に加えて、解像性に優れた化学増幅された化学増幅型フォトレジスト組成物の現像が必要となる。遅延拡散する光酸発生剤(PAG)添加剤の使用は、解像度及びパターン品質における改善に必要不可欠であることが判明した。化学増幅型フォトレジスト組成物における酸拡散の遅延は、酸性単位を1つ以上の嵩高い極性置換基に結合させることによって実現された。しかしながら、PAG容量を増加させることは、典型的なフォトレジスト組成物溶媒におけるPAG溶解度を低下させる欠点を有する。その結果、多量のPAGが、フォトレジストフィルムマトリックス内で分離または不均一分布を起こしやすい。また、減少したPAG溶解度は、フォトレジスト組成物の配合空間を狭め、化学増幅型フォトレジスト組成物中に充填することができるPAGの量を制限する。さらに、低いPAG溶解度は、リソグラフィー加工中及び加工後の欠陥の形成と関連する。
RO(C=O)(CXY)p(CF2)nSO3 −M+
(式中、Rは、重合性炭素−炭素二重結合または炭素−炭素三重結合を含む有機基であり、X及びYは、それぞれの出現で独立して、水素または非水素置換基であり、pは0、1、2、3、または4であり、かつnは1、2、3、または4であるが、ただし、nとpとの合計は少なくとも2、または少なくとも3であることを条件とし、M+は、有機カチオンである)を有する。
RO(C=O)(CXY)p(CF2)nSO3 −M+
(式中、Rは、重合性炭素−炭素二重結合または炭素−炭素三重結合を含む有機基であり、X及びYは、水素であり、pは、1、2、3、または4であり、nは、1、2、3、または4であり、M+は、有機カチオンである)を有する。
この実施例は、3つの発明のモノマーの合成を記載する。TBPDBT ADMA−TFPSと称されるモノマーの合成経路図を図1に要約する。200mLのアセトニトリル中4−ブロモ−4,4,5,5−テトラフルオロペンタン酸(20g、158.1mmol)、N,N−ジメチルホルムアミド(2.0g、36mmol)の混合物に、塩化オキサリル(20g、157.57mmol)を滴加した。混合物を室温で2時間撹拌し、次いで150mLのアセトニトリル中ピリジン(12.4g、156.76mmol)及び3−ヒドロキシアダマンタンメタノール(化合物3、28.8g、158.01mmol)からなる溶液に滴加した。混合物を室温で4時間撹拌し、次いで溶媒を減圧下で完全に留去し、得られた残渣を塩化メチレン200mL中に溶解し、0.1N塩酸200mLで2回洗浄し、次いで脱イオン水200mLで2回洗浄した。有機相をMgSO4で乾燥させ、濾過し、溶媒を完全に除去して、粗生成物(3−ヒドロキシアダマンタン−1−イル)メチル5−ブロモ−4,4,5,5−テトラフルオロペンタノエート(化合物4、60g)を無色油状物として生成し、これをさらに精製せずに次のステップで使用した。
この実施例は、4つの発明の合成及び3つの比較コポリマーを記載する。コポリマー1を36.5:47.5:11:5のモル供給比で、モノマーPPMA、α−GBLMA、DiHFA、及びTBPDBT ADMA−TFPSから調製した。乳酸エチル/ガンマ−ブチロラクトンの30:70(v/v)混合物51.8g中にPPMA(12.0g、58.7mmol)、α−GBLMA(13.01g、76.5mmol)、DiHFA(8.86g、17.7mmol)、及びTBPDBT ADMA−TFPS(6.35g、8.0mmol)を溶解することによって、供給溶液を作製した。アセトニトリル/テトラヒドロフランの2:1(v/v)混合物8g中に4.0gのアゾ開始剤2,2´−アゾビス(2,4−ジメチルバレロニトリル)(Wako Pure Chemical Industries,Ltd.社からV−65として得られる)を溶解することによって、開始剤溶液を調製した。
表3に要約したように、コポリマー1及び2を含有するフォトレジスト組成物をそれぞれ独立して配合した。比較コポリマー5を含有する比較組成物を同様に調製した。表3の成分量は、溶媒を除く全固形物に基づく。非ポリマー性光酸発生剤は、TBPDBT DHCであり、これは、化学構造
Claims (14)
- pが、1、2、3、または4である、請求項1に記載のモノマー。
- EWG1及びEWG2が、それぞれの出現で独立して、F、部分フッ素化アルキル、またはパーフルオロ化アルキルである、請求項1または2に記載のモノマー。
- EWG1及びEWG2が、それぞれの出現でFである、請求項3に記載のモノマー。
- EWG1及びEWG2が、それぞれの出現で独立して、F、CF3、−CN、−NO2、−C(=O)R11、−C(=O)OR11、及びSO2R11であり、式中、R11が、C1−30脂肪族有機基、C6−30芳香族有機基、またはC1−30複素環式芳香族有機基である、請求項1または2に記載のモノマー。
- Rが、その構造の一部または全てとして、C2−12アルケニル、C2−12アルキニル、アクリロイル、2−(C1−12−アルキル)アクリロイル、2−(C1−12−フルオロアルキル)アクリロイル、2−シアノアクリロイル、または2−フルオロアクリロイルを含む、請求項1または2に記載のモノマー。
- nとpとの合計が、少なくとも3である、請求項1または2に記載のモノマー。
- pが、1、2、3、または4であり、X及びYが、水素である、請求項1または2に記載のモノマー。
- 請求項1〜11のいずれか一項に記載のモノマーから誘導される繰り返し単位を含む、ポリマー。
- 請求項12に記載のポリマーを含む、フォトレジスト組成物。
- フォトレジストレリーフ像を形成する方法であって、
(a)請求項13に記載のフォトレジスト組成物の層を基板上に塗布して、フォトレジスト層を形成することと、
(b)前記フォトレジスト層をパターンに従って活性化放射線に露光して、露光されたフォトレジスト層を形成することと、
(c)前記露光されたフォトレジスト層を現像して、フォトレジストレリーフ像を提供することと、を含む、方法。
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US201615055911A | 2016-02-29 | 2016-02-29 | |
US15/055,911 | 2016-02-29 | ||
US15/131,135 | 2016-04-18 | ||
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CN111704601A (zh) * | 2020-06-16 | 2020-09-25 | 徐州博康信息化学品有限公司 | 一种由3,5-二羟基环己酮合成的可降解型光刻胶产酸树脂单体及其制备方法 |
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TW201731892A (zh) | 2017-09-16 |
US11947258B2 (en) | 2024-04-02 |
US20170248844A1 (en) | 2017-08-31 |
JP6745738B2 (ja) | 2020-08-26 |
KR102208137B1 (ko) | 2021-01-26 |
US20230212112A1 (en) | 2023-07-06 |
CN107129448A (zh) | 2017-09-05 |
JP2020041165A (ja) | 2020-03-19 |
KR20180052119A (ko) | 2018-05-17 |
CN107129448B (zh) | 2022-04-26 |
KR20170101801A (ko) | 2017-09-06 |
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US11613519B2 (en) | 2023-03-28 |
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