JP6807294B2 - フッ素化熱酸発生剤を含有するトップコート組成物 - Google Patents
フッ素化熱酸発生剤を含有するトップコート組成物 Download PDFInfo
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- JP6807294B2 JP6807294B2 JP2017208792A JP2017208792A JP6807294B2 JP 6807294 B2 JP6807294 B2 JP 6807294B2 JP 2017208792 A JP2017208792 A JP 2017208792A JP 2017208792 A JP2017208792 A JP 2017208792A JP 6807294 B2 JP6807294 B2 JP 6807294B2
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- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 claims 1
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Classifications
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- 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
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2041—Exposure; Apparatus therefor in the presence of a fluid, e.g. immersion; using fluid cooling means
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
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- 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
- G03F7/26—Processing photosensitive materials; Apparatus therefor
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- 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
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/30—Imagewise removal using liquid means
- G03F7/32—Liquid compositions therefor, e.g. developers
- G03F7/325—Non-aqueous compositions
- G03F7/327—Non-aqueous alkaline compositions, e.g. anhydrous quaternary ammonium salts
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- 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
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/38—Treatment before imagewise removal, e.g. prebaking
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- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/40—Treatment after imagewise removal, e.g. baking
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- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
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- 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
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Description
本発明のトップコート組成物は、マトリックスポリマー、表面活性ポリマー、イオン性熱酸発生剤(TAG)、溶媒を含み、1つ以上の更なる任意の成分を含み得る。
本発明で有用なフォトレジスト組成物としては、例えば、酸感受性のマトリックス樹脂を含む化学増幅フォトレジスト組成物が挙げられ、これは、フォトレジスト組成物層の一部として、樹脂及び組成物層が、ソフトベーク、活性化放射線への露光、及び露光後ベーク後に光酸発生剤によって生成された酸との反応の結果として、有機現像液中の溶解度の変化を受けることを意味する。本フォトレジスト組成物は、ポジ型またはネガ型であり得る。溶解度の変化は、マトリックスポリマー中の酸切断性脱離基、例えば、光酸不安定エステルまたはアセタール基が、活性化放射線への露光及び熱処理の際に光酸促進脱保護反応を受けて、酸またはアルコール基を産生したときにもたらされる。
フォトレジスト組成物は、スピンコーティング、浸漬、ローラーコーティング、または他の従来のコーティング技法等によって基板に適用され得、スピンコーティングが典型的である。スピンコーティングの場合、コーティング溶液の固形分含有量は、利用される特定のスピン装置、溶液の粘度、スピナーの速度、及びスピン許容時間に基づいて、所望のフィルム暑さを提供するように調整され得る。
以下のモノマーを使用して、ポリマーを以下に記載されるように合成し、モノマー比を、ポリマーに基づいてモルパーセント(mol%)として提供する。
モノマー供給溶液を、10gの4−メチル−2−ペンタノール(4M2P)、6gのモノマーM1、及び4gのモノマーM2を容器内で合わせ、この混合物を撹拌してこれらの2つのモノマーを溶解させることによって調製した。開始剤供給溶液を、0.61gのWako V−601開始剤(E.I.du Pont de Nemours and Company)及び6.2gの4M2Pを容器内で合わせ、この混合物を撹拌して開始剤を溶解させることによって調製した。13.3gの4M2Pを反応容器に導入し、この容器を窒素で30分間パージした。次に、反応容器を撹拌しながら88℃に加熱した。モノマー供給溶液及び開始剤供給溶液を反応容器に同時に導入した。モノマー供給溶液を1.5時間にわたって供給し、開始剤供給溶液を2時間にわたって供給した。反応容器を撹拌しながら88℃で更に3時間維持し、その後、室温に冷却させた。これにより、マトリックスポリマーMP−1が形成された[Mw=13.6kDa、PDI=2.4]。
モノマー供給溶液を、57.1gのモノマーM3、50.7gのモノマーM4、及び15.1gの酢酸プロピレングリコールモノメチルエーテル(PGMEA)を容器内で合わせることによって調製した。この混合物を撹拌して、モノマーを溶解させた。開始剤供給溶液を、3.9gのWako V−601開始剤及び34.9gのPGMEAを容器内で合わせることによって調製した。この混合物を撹拌して、開始剤を溶解させた。54.0gのPGMEAを反応容器に導入し、この容器を窒素で30分間パージした。次に、反応容器を撹拌しながら99℃に加熱した。モノマー供給溶液及び開始剤供給溶液を2時間にわたって反応容器に同時に導入した。反応容器を99℃で更に2時間維持した。その後、反応混合物を室温に冷却させた。これにより、表面活性ポリマーSAP−1が形成された[Mw=11.7kDa、PDI=2.0]。
以下の熱酸発生剤を以下に記載されるように合成した。
ピリジン(5g、0.063mol)を、メタノール(250mL)中1,1,2,2,3,3,4,4,4−ノナフルオロブタン−1−スルホン酸(14.64g、0.049mol)の溶液に添加した。結果として生じた混合物を室温で一晩撹拌した。結果として生じた反応混合物を減圧下で濃縮して固体粗生成物を得て、その後、これをヘプタン(300mL)で洗浄した。固体を濾過し、メチル第三ブチルエーテル(100mL)で洗浄して、熱酸発生剤TAG−1を90%の収率で得た。[1H NMR(CDCl3,500MHz):δ8.50(m,2H),9.16(m,1H),9.23(m,2H)。19F NMR((CD3)2CO,500MHz):δ−115.65,−117.92,−122.25,−126.79.]
3−フルオロピリジン(20g、0.21mol)を、メタノール(250mL)中1,1,2,2,3,3,4,4,4−ノナフルオロブタン−1−スルホン酸(56g、0.186mol)の溶液に添加した。結果として生じた混合物を室温で一晩撹拌した。結果として生じた反応混合物を減圧下で濃縮して固体粗生成物を得て、その後、これをヘプタン(300mL)で洗浄した。固体を濾過し、メチル第三ブチルエーテル(100mL)で洗浄して、熱酸発生剤TAG−2を80%の収率で得た。[1H NMR(CDCl3,500MHz):δ9.184(s1H)9.01(m,1H),8.72(m,1H),8.39(m,1H),7.07(bs,1H)。19F NMR((CD3)2CO,500MHz):δ−82.26,−115.65,−117.92,−122.25,−126.79.]
3−フルオロピリジン(10g、0.102mol)を、メタノール(200mL)中カンファースルホン酸(20g、0.086mol)の溶液に添加した。結果として生じた混合物を室温で一晩撹拌した。反応混合物を減圧下で濃縮して固体粗生成物を得て、その後、これをヘプタン(200mL)で洗浄した。固体を濾過し、メチル第三ブチルエーテル(100mL)で洗浄して、熱酸発生剤TAG−3を75%の収率で得た。[1H NMR((CD3)2CO,500MHz):δ0.9(s,3H),1.2(2,3H),1.4(t,1H),1.7(t,1H),1.85(m,1H),2.0(m,2H),2.25(d,1H),2.85(m,2H),3.4(d,1H),9.18(s,1H),9.01(m,1H),8.72(m,1H),8.39(m,1H),7.07(bs,1H)。19F NMR((CD3)2CO,500MHz):δ−82.3]。
50重量%水溶液として5−スルホイソフタル酸(6.3g、24.3mmol)を、窒素流下で、15g(70.7mmol)の4,4,4−トリフルオロ−3−(トリフルオロメチル)ブタン−1,3−ジオールと室温で混合した。次に、反応混合物の温度を110−120℃に上昇させ、副生成物として水を一定して蒸発させながら反応を2−3時間行った。その後、反応混合物を1M HCl水溶液中に注いだ。5−10分後、混合物を2つの層に分離した。有機層を回収し、1M HCl水溶液で3回洗浄し、その後、ジエチルエーテルで抽出した。その後、粗組成物をMgSO4上で乾燥させた。揮発性混入物質を回転蒸発により除去して、粗組成物を得た。次に、粗組成物をヘプタン:アセトン(8:2体積)で洗浄して、固体3,5−ビス((4,4,4−トリフルオロ−3−ヒドロキシ−3−(トリフルオロメチル)ブトキシ)カルボニル)ベンゼンスルホン酸(SIPA−DiHFA)を64%の収率で得た。[1H NMR((CD3)2CO,500MHz):δ2.63(t,4H),4.68(t,4H),7.11(bs,3H),8.68(m,3H)。19F NMR((CD3)2CO,500MHz):δ−76.56]。3−フルオロピリジン(7g、72.14mmol)を、メタノール(200mL)中SIPA−DiHFA(32g、48.33mmol)の溶液に添加した。結果として生じた混合物を室温で一晩撹拌した。反応混合物を減圧下で濃縮して、粗組成物を得た。結果として生じた粗組成物にヘプタン(300mL)を添加し、混合物を数時間静置させて、固体生成物を得た。固体生成物を濾過し、ヘプタン及びジクロロメタンで洗浄して、熱酸発生剤TAG−4を90%の収率で得た。[1H NMR(CDCl3,500MHz):δ2.17(t,4H),4.14(t,4H),7.30(m,4H),8.45(m,3H)。19F NMR((CD3)2CO,500MHz):δ−76.56,−123.06.]
ピリジン(2g、0.025mol)を、メタノール(200mL)中SIPA−DiHFA(10g、0.015mol)(TAG−4のために調製したもの)の溶液に添加した。結果として生じた混合物を室温で一晩撹拌した。反応混合物を減圧下で濃縮した。結果として生じた粗組成物にヘプタン(100mL)を添加し、混合物を数時間静置させて、固体生成物を得た。固体生成物を濾過し、ヘプタン及びジクロロメタンで洗浄して、熱酸発生剤TAG−5を90%の収率で得た。[1H NMR((CD3)2CO,500MHz):δ2.63(t,4H),4.68(t,4H),7.11(bs,3H),8.68(m,3H),8.50(m,2H),9.16(m,1H),9.23(m,2H)。19F NMR((CD3)2CO,500MHz):δ−76.62.]
トップコート組成物を、マトリックスポリマーMP−1、表面活性ポリマーSAP−1、及び熱酸発生剤を、4−メチル−2−ペンタノール、ジプロピレングリコールメチルエーテル、及びイソ酪酸イソブチルを含む溶媒系に表1に記載の量で添加することによって配合した。各混合物を0.2μmのPTFEディスクに通して濾過した。
200mmのシリコンウェハを、HMDSで、120℃で30秒間プライムし、TEL ACT−8ウェハトラック上にEPIC(商標)2135ポジフォトレジスト(Dow Electronic Materials)をコーティングし、プライムしたシリコン上で1200Åの厚さにした。トップコート組成物をそれぞれのレジストコーティングウェハ上にコーティングして385Åの厚さにし、その後、同じウェハトラック上で、90℃で60秒間ベークした。脱イオン水に対する後退接触角(RCA)を試料毎に測定した。RCAを、KRUSS滴下形状分析器モデル100を使用して測定した。脱イオン水の液滴サイズは、50μLであり、ウェハステージ傾斜速度は、1単位/秒であった。水滴を試験ウェハ表面上に落とすと、ウェハステージの傾斜が即座に始まった。ウェハステージ傾斜中、液滴の映像を、液滴がその元の位置から離れて滑り始めるまで、20フレーム/秒の速度で撮った。映像の各フレームを分析し、液滴が滑り始めたときのフレーム上の液滴の像を使用して、RCAをそれらの対応する接線によって決定した。結果を表2に示す。
TEL ACT−8トラック上で、200mmシリコンウェハを、HMDSで、120℃で30秒間プライムし、その後、EPIC(商標)2135フォトレジストをコーティングして、2000Åの乾燥厚さにした。これらのウェハを110℃で60秒間ソフトベークした。各トップコート組成物をそれぞれのウェハのフォトレジスト層上にコーティングし、90℃で60秒間ソフトベークして、385Åの乾燥厚さにした。その後、ウェハを110℃で60秒間ベークし、0.26NのTMAH現像液溶液中で60秒間現像し、蒸留水ですすぎ、スピン乾燥させた。残りのフォトレジストフィルム厚さを測定し、非露光フィルム厚さ損失(UFTL)を、コーティング後の初期フォトレジストフィルム厚さから現像後の残りのフォトレジストフィルム厚さを差し引いたものとして計算した。結果を表2に示す。
200mmのシリコンウェハにAR(商標)40A反射防止剤材料(Dow Electronic Materials)をコーティングして80nmの乾燥厚さにしたものに、EPIC(商標)2135フォトレジストをスピンコーティングし、110℃で90秒間ソフトベークして、2950Åのレジスト層厚さを得た。フォトレジスト上に各トップコート組成物をコーティングし、90℃で60秒間ソフトベークして、385Åの厚さを得た。各ウェハを、NA=0.75でのASML ArF 1100スキャナを使用し、環状照射(0.89/0.64シグマ)、90nmの特徴部サイズを有する高密度トレンチ/ラインパターンを1:1で有する二成分マスクを使用して、27mJ/cm2〜43mJ/cm2の範囲の用量範囲で露光した。露光したウェハを110℃で60秒間露光後ベークし、0.26NのTMAH現像液溶液で現像して、様々な限界寸法(CD)を有するトレンチ/ラインフォトレジストパターンを形成した。トレンチのCDを、Hitachi 9380 CD−SEMを使用してトップダウン走査電子顕微鏡法(SEM)によって捕捉された像を加工することによって決定した。これらのパターンをパターン崩壊について観察した。最も大きい非崩壊トレンチのCD(CDPC)を表2に報告し、より大きいCDPC値がより良好なパターン崩壊性能を示す。
200mmのシリコンウェハにAR(商標)40A反射防止剤(Dow Electronic Materials)をスピンコーティングし、215℃で60秒間ベークして、75nmの第1の底部反射防止コーティング(BARC)層を形成する。AR(商標)124反射防止剤(Dow Electronic Materials)を第1のBARC層上にコーティングし、205℃で60秒間ベークして、23nmの上部BARC層を形成する。ウェハにEPIC(商標)2096ポジフォトレジスト(Dow Electronic Materials)をコーティングして、1200Åの乾燥厚さにする。トップコート組成物TC−2〜TC−6をレジストコーティングウェハ上にコーティングして385Åの厚さにし、その後、90℃で60秒間ベークする。ウェハを、ライン及び空間パターンを有するパターン形成フォトマスクを通して液浸スキャナ上で露光する。ウェハを100℃で60秒間露光後ベークし、0.26NのTMAH現像液溶液で12秒間現像する。フォトレジストライン及び空間パターンが形成されることが予期される。
Claims (12)
- フォトレジスト層の上に適用されるトップコート組成物であって、
マトリックスポリマーと、
前記マトリックスポリマーの表面エネルギーよりも低い表面エネルギーを有する表面活性ポリマーと、
アニオン及びカチオンを含むイオン性熱酸発生剤であって、前記カチオンがフッ素化されている、イオン性熱酸発生剤と、
溶媒と、を含む、トップコート組成物。 - フォトレジスト層の上に適用されるトップコート組成物であって、
マトリックスポリマーと、
前記マトリックスポリマーの表面エネルギーよりも低い表面エネルギーを有する表面活性ポリマーと、
アニオン及びカチオンを含むイオン性熱酸発生剤であって、前記カチオン、または前記アニオン及び前記カチオンがフッ素化され、かつ前記アニオンが多環式である、イオン性熱酸発生剤と、
溶媒と、を含む、トップコート組成物。 - フォトレジスト層の上に適用されるトップコート組成物であって、
マトリックスポリマーと、
前記マトリックスポリマーの表面エネルギーよりも低い表面エネルギーを有する表面活性ポリマーと、
アニオン及びカチオンを含むイオン性熱酸発生剤であって、前記アニオン、前記カチオン、または前記アニオン及び前記カチオンがフッ素化され、前記イオン性熱酸発生剤が、ヒドロキシル基のアルファ位で炭素に結合したフッ素原子及び/またはヒドロキシル基のアルファ位で炭素にペンダント状に結合したフッ素化基を含むフッ素化アルコール基を含む、イオン性熱酸発生剤と、
溶媒と、を含む、トップコート組成物。 - 前記フッ素化アルコール基が、エステル基を介して前記アニオンの芳香族環に結合している、請求項3に記載のトップコート組成物。
- 前記アニオンが、それぞれのエステル基を介して前記芳香族環に結合した複数のフッ素化アルコール基を含む、請求項4に記載のトップコート組成物。
- フォトレジスト層の上に適用されるトップコート組成物であって、
マトリックスポリマーと、
前記マトリックスポリマーの表面エネルギーよりも低い表面エネルギーを有する表面活性ポリマーと、
アニオン及びカチオンを含むイオン性熱酸発生剤であって、前記アニオン、前記カチオン、または前記アニオン及び前記カチオンがフッ素化され、前記イオン性熱酸発生剤が、窒素含有カチオンを含む、イオン性熱酸発生剤と、
溶媒と、を含む、トップコート組成物。 - フォトレジスト層の上に適用されるトップコート組成物であって、
マトリックスポリマーと、
前記マトリックスポリマーの表面エネルギーよりも低い表面エネルギーを有する表面活性ポリマーと、
アニオン及びカチオンを含み、前記アニオン、前記カチオン、または前記アニオン及び前記カチオンがフッ素化されているイオン性熱酸発生剤であって、前記カチオンが、下記式(I):
溶媒と、を含む、トップコート組成物。 - 前記イオン性熱酸発生剤が100℃以下の活性化温度を有する、請求項1〜7のいずれかに記載のトップコート組成物。
- 光酸発生剤を更に含む、請求項1〜8のいずれかに記載のトップコート組成物。
- 前記溶媒が、C4〜C8 n−アルコール、イソブタノール、2−メチル−1−ブタノール、イソペンタノール、2,3−ジメチル−1−ブタノール、4−メチル−2−ペンタノール、イソヘキサノール、及びイソヘプタノール、それらの異性体、ならびにそれらの混合物からなる群から選択される第1の有機溶媒、C8〜C12 n−アルカン、それらの異性体、及びそれらの異性体の混合物、イソブチルエーテル、イソペンチルエーテル、イソブチルイソヘキシルエーテル、それらのアルキルエーテル異性体、ならびにそれらの混合物、ペンタン酸プロピル、ペンタン酸イソプロピル、3−メチルブタン酸イソプロピル、2−メチルブタン酸イソプロピル、ピバル酸イソプロピル、イソ酪酸イソブチル、イソ酪酸2−メチルブチル、2−メチルブタン酸2−メチルブチル、2−メチルヘキサン酸2−メチルブチル、ヘプタン酸2−メチルブチル、ヘプタン酸ヘキシル、n−酪酸n−ブチル、n−酪酸イソアミル、及びイソ吉草酸イソアミルからなる群から選択される第2の有機溶媒、ならびにジエチレングリコールモノメチルエーテル、ジプロピレングリコールモノメチルエーテル、それらのジアルキルグリコールモノアルキルエーテル異性体、及びそれらの混合物からなる群から選択される第3の有機溶媒を含む有機溶媒の混合物を含む、請求項1〜9のいずれかに記載のトップコート組成物。
- 半導体基板と、前記半導体基板上のフォトレジスト層と、前記フォトレジスト層上のトップコート層と、を備える、コーティングされた基板であって、前記トップコート層が、請求項1〜10のいずれかに記載のトップコート組成物から形成される、コーティングされた基板。
- パターン形成方法であって、
(a)基板上に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上に、請求項1〜10のいずれかに記載のトップコート組成物から形成されるトップコート層を形成することと、
(c)前記トップコート層及び前記フォトレジスト層を活性化放射線に露光することと、 (d)前記露光されたトップコート層及びフォトレジスト層を現像液と接触させて、フォトレジストパターンを形成することと、を含む、方法。
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