JP5206508B2 - レジストパターンコーティング剤及びそれを用いたレジストパターン形成方法 - Google Patents
レジストパターンコーティング剤及びそれを用いたレジストパターン形成方法 Download PDFInfo
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- JP5206508B2 JP5206508B2 JP2009054664A JP2009054664A JP5206508B2 JP 5206508 B2 JP5206508 B2 JP 5206508B2 JP 2009054664 A JP2009054664 A JP 2009054664A JP 2009054664 A JP2009054664 A JP 2009054664A JP 5206508 B2 JP5206508 B2 JP 5206508B2
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- 125000004432 carbon atom Chemical group C* 0.000 claims description 63
- 150000001875 compounds Chemical class 0.000 claims description 53
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 21
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- 125000003545 alkoxy group Chemical group 0.000 claims description 16
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- 125000004122 cyclic group Chemical group 0.000 claims description 13
- 125000003118 aryl group Chemical group 0.000 claims description 7
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 17
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 17
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- 238000001644 13C nuclear magnetic resonance spectroscopy Methods 0.000 description 8
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 8
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- SMEROWZSTRWXGI-UHFFFAOYSA-N Lithocholsaeure Natural products C1CC2CC(O)CCC2(C)C2C1C1CCC(C(CCC(O)=O)C)C1(C)CC2 SMEROWZSTRWXGI-UHFFFAOYSA-N 0.000 description 7
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- KXGVEGMKQFWNSR-UHFFFAOYSA-N deoxycholic acid Natural products C1CC2CC(O)CCC2(C)C2C1C1CCC(C(CCC(O)=O)C)C1(C)C(O)C2 KXGVEGMKQFWNSR-UHFFFAOYSA-N 0.000 description 7
- 125000000524 functional group Chemical group 0.000 description 7
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- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 6
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 6
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 6
- 150000001298 alcohols Chemical class 0.000 description 6
- 125000004183 alkoxy alkyl group Chemical group 0.000 description 6
- 125000005194 alkoxycarbonyloxy group Chemical group 0.000 description 6
- BTANRVKWQNVYAZ-UHFFFAOYSA-N butan-2-ol Chemical compound CCC(C)O BTANRVKWQNVYAZ-UHFFFAOYSA-N 0.000 description 6
- 238000013329 compounding Methods 0.000 description 6
- BGTOWKSIORTVQH-UHFFFAOYSA-N cyclopentanone Chemical compound O=C1CCCC1 BGTOWKSIORTVQH-UHFFFAOYSA-N 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- CATSNJVOTSVZJV-UHFFFAOYSA-N heptan-2-one Chemical compound CCCCCC(C)=O CATSNJVOTSVZJV-UHFFFAOYSA-N 0.000 description 6
- 125000004356 hydroxy functional group Chemical group O* 0.000 description 6
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- BPCNEKWROYSOLT-UHFFFAOYSA-N n-phenylprop-2-enamide Chemical compound C=CC(=O)NC1=CC=CC=C1 BPCNEKWROYSOLT-UHFFFAOYSA-N 0.000 description 6
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- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 6
- TXBCBTDQIULDIA-UHFFFAOYSA-N 2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)COCC(CO)(CO)CO TXBCBTDQIULDIA-UHFFFAOYSA-N 0.000 description 5
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- 125000004093 cyano group Chemical group *C#N 0.000 description 5
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- 229910052736 halogen Inorganic materials 0.000 description 5
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- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 description 4
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- VPWNQTHUCYMVMZ-UHFFFAOYSA-N 4,4'-sulfonyldiphenol Chemical compound C1=CC(O)=CC=C1S(=O)(=O)C1=CC=C(O)C=C1 VPWNQTHUCYMVMZ-UHFFFAOYSA-N 0.000 description 3
- YXALYBMHAYZKAP-UHFFFAOYSA-N 7-oxabicyclo[4.1.0]heptan-4-ylmethyl 7-oxabicyclo[4.1.0]heptane-4-carboxylate Chemical compound C1CC2OC2CC1C(=O)OCC1CC2OC2CC1 YXALYBMHAYZKAP-UHFFFAOYSA-N 0.000 description 3
- LCFVJGUPQDGYKZ-UHFFFAOYSA-N Bisphenol A diglycidyl ether Chemical compound C=1C=C(OCC2OC2)C=CC=1C(C)(C)C(C=C1)=CC=C1OCC1CO1 LCFVJGUPQDGYKZ-UHFFFAOYSA-N 0.000 description 3
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
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- 125000001931 aliphatic group Chemical group 0.000 description 3
- 150000003973 alkyl amines Chemical class 0.000 description 3
- XUCHXOAWJMEFLF-UHFFFAOYSA-N bisphenol F diglycidyl ether Chemical compound C1OC1COC(C=C1)=CC=C1CC(C=C1)=CC=C1OCC1CO1 XUCHXOAWJMEFLF-UHFFFAOYSA-N 0.000 description 3
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
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- 150000004292 cyclic ethers Chemical class 0.000 description 3
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- DAZXVJBJRMWXJP-UHFFFAOYSA-N n,n-dimethylethylamine Chemical compound CCN(C)C DAZXVJBJRMWXJP-UHFFFAOYSA-N 0.000 description 1
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- 125000002868 norbornyl group Chemical group C12(CCC(CC1)C2)* 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 125000003261 o-tolyl group Chemical group [H]C1=C([H])C(*)=C(C([H])=C1[H])C([H])([H])[H] 0.000 description 1
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- AHHWIHXENZJRFG-UHFFFAOYSA-N oxetane Chemical compound C1COC1 AHHWIHXENZJRFG-UHFFFAOYSA-N 0.000 description 1
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- 125000004043 oxo group Chemical group O=* 0.000 description 1
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- 150000003220 pyrenes Chemical class 0.000 description 1
- PBMFSQRYOILNGV-UHFFFAOYSA-N pyridazine Chemical compound C1=CC=NN=C1 PBMFSQRYOILNGV-UHFFFAOYSA-N 0.000 description 1
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- WFLZPBIWJSIELX-UHFFFAOYSA-N tert-butyl n-[10-[(2-methylpropan-2-yl)oxycarbonylamino]decyl]carbamate Chemical compound CC(C)(C)OC(=O)NCCCCCCCCCCNC(=O)OC(C)(C)C WFLZPBIWJSIELX-UHFFFAOYSA-N 0.000 description 1
- HXINNZFJKZMJJJ-UHFFFAOYSA-N tert-butyl n-[12-[(2-methylpropan-2-yl)oxycarbonylamino]dodecyl]carbamate Chemical compound CC(C)(C)OC(=O)NCCCCCCCCCCCCNC(=O)OC(C)(C)C HXINNZFJKZMJJJ-UHFFFAOYSA-N 0.000 description 1
- VDSMPNIBLRKWEG-UHFFFAOYSA-N tert-butyl n-[6-[(2-methylpropan-2-yl)oxycarbonylamino]hexyl]carbamate Chemical compound CC(C)(C)OC(=O)NCCCCCCNC(=O)OC(C)(C)C VDSMPNIBLRKWEG-UHFFFAOYSA-N 0.000 description 1
- NMEQKHOJGXGOIL-UHFFFAOYSA-N tert-butyl n-[7-[(2-methylpropan-2-yl)oxycarbonylamino]heptyl]carbamate Chemical compound CC(C)(C)OC(=O)NCCCCCCCNC(=O)OC(C)(C)C NMEQKHOJGXGOIL-UHFFFAOYSA-N 0.000 description 1
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- Photosensitive Polymer And Photoresist Processing (AREA)
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Description
本発明のレジストパターンコーティング剤は、ヒドロキシアクリルアニリドとヒドロキシメタクリルアニリドの少なくともいずれかの単量体に由来する構造単位を含む(I)樹脂と、(II)ラジカル発生剤と、を含有するものである。この両成分((I)樹脂及び(II)ラジカル発生剤)を配合することにより、硬化性能に優れ、露光処理、現像液、及びポジ型感放射線性樹脂組成物に対して十分に安定な不溶化レジストパターンを形成することができる。以下、その詳細について説明する。
(I)樹脂は、ヒドロキシアクリルアニリドとヒドロキシメタクリルアニリドの少なくともいずれかの単量体に由来する構造単位を含むものである。以下、「ヒドロキシアクリルアニリド」と「ヒドロキシメタクリルアニリド」を、まとめて「ヒドロキシ(メタ)アクリルアニリド」ともいう。
ヒドロキシ(メタ)アクリルアニリドは、例えば、下記一般式(2)で表すことのできる化合物である。
単量体(i)は、下記一般式(i)で表される化合物である。
単量体(ii)は、下記一般式(ii)で表される化合物である。
単量体(iii)は、下記一般式(iii)で表される化合物、即ち、スチレン誘導体である。
単量体(iv)は、アルコール性水酸基を有する単量体である。単量体(iv)の具体例としては、2−ヒドロキシエチルアクリレート、2−ヒドロキシエチルメタクリレート、2−ヒドロキシプロピルアクリレート、2−ヒドロキシプロピルメタクリレート、4−ヒドロキシブチルアクリレート、4−ヒドロキシブチルメタクリレート、グリセロールモノメタクリレート等のヒドロキシアルキル(メタ)アクリレート等を挙げることができる。なかでも、2−ヒドロキシエチルアクリレート、2−ヒドロキシエチルメタクリレートが好ましい。これらの単量体(iv)は、一種単独で又は二種以上を組み合わせて用いることができる。
単量体(v)は、カルボン酸等の有機酸由来の水酸基を有する単量体である。単量体(v)の具体例としては、アクリル酸、メタクリル酸、クロトン酸、2−サクシノロイルエチル(メタ)アクリレート、2−マレイノロイルエチル(メタ)アクリレート、2−ヘキサヒドロフタロイルエチル(メタ)アクリレート、ω−カルボキシ−ポリカプロラクトンモノアクリレート、フタル酸モノヒドロキシエチルアクリレート、アクリル酸ダイマー、2−ヒドロキシ−3−フェノキシプロピルアクリレート、t−ブトキシメタクリレート、t−ブチルアクリレート等のモノカルボン酸;マレイン酸、フマル酸、シトラコン酸、メサコン酸、イタコン酸等のジカルボン酸をはじめとする、カルボキシル基を有する(メタ)アクリル酸誘導体等を挙げることができる。なかでも、アクリル酸、メタクリル酸、2−ヘキサヒドロフタロイルエチルメタクリレートが好ましい。これらの単量体(v)は、一種単独で又は二種以上を組み合わせて用いることができる。
単量体(vi)は、フェノール性水酸基を有する単量体である。但し、この単量体(6)の概念には、ヒドロキシ(メタ)アクリルアニリドは包含されない。単量体(vi)の具体例としては、p−ヒドロキシスチレン、m−ヒドロキシスチレン、o−ヒドロキシスチレン、α−メチル−p−ヒドロキシスチレン、α−メチル−m−ヒドロキシスチレン、α−メチル−o−ヒドロキシスチレン、2−アリルフェノール、4−アリルフェノール、2−アリル−6−メチルフェノール、2−アリル−6−メトキシフェノール、4−アリル−2−メトキシフェノール、4−アリル−2,6−ジメトキシフェノール、4−アリルオキシ−2−ヒドロキシベンゾフェノン等を挙げることができる。なかでも、p−ヒドロキシスチレン、α−メチル−p−ヒドロキシスチレンが好ましい。
単量体(vii)の具体例は、(メタ)アクリル酸アリールエステル類、ジカルボン酸ジエステル類、ニトリル基含有重合性化合物、アミド結合含有重合性化合物、ビニル類、アリル類、塩素含有重合性化合物、共役ジオレフィン等がある。より具体的には、マレイン酸ジエチル、フマル酸ジエチル、イタコン酸ジエチル等のジカルボン酸ジエステル;フェニル(メタ)アクリレート、ベンジル(メタ)アクリレート等の(メタ)アクリル酸アリールエステル;t−ブチル(メタ)アクリレート、4,4,4−トリフルオロ−3−ヒドロキシ−1−メチル−3−トリフルオロメチル−1−ブチル(メタ)アクリレート等の(メタ)アクリル酸エステル;アクリロニトリル、メタクリロニトリル等のニトリル基含有重合性化合物;アクリルアミド、メタクリルアミド等のアミド結合含有重合性化合物;酢酸ビニル等の脂肪酸ビニル類;塩化ビニル、塩化ビニリデン等の塩素含有重合性化合物;1,3−ブタジエン、イソプレン、1,4−ジメチルブタジエン等の共役ジオレフィン類を挙げることができる。これらの単量体(vii)は、一種単独で又は二種以上を組み合わせて用いることができる。
(I)樹脂は、例えば、ヒドロパーオキシド類、ジアルキルパーオキシド類、ジアシルパーオキシド類、アゾ化合物等のラジカル重合開始剤を使用し、必要に応じて添加される連鎖移動剤の存在下、適当な溶媒中で単量体成分を重合することにより調製することができる。
(II)ラジカル発生剤は、加熱すること等によりラジカルを発生する化合物である。この(II)ラジカル発生剤は、好ましくは50〜160℃、更に好ましくは50〜140℃でラジカルを発生する化合物である。この(II)ラジカル発生剤を含有させることで、熱によりラジカルを発生させ、架橋剤の硬化反応を促進させることができる。
本発明のレジストパターンコーティング剤には、通常、アルコール溶媒が含有される。このアルコール溶媒は、アルコールを含む溶媒であり、実質的にアルコールからなる溶媒であることが好ましい。なお、アルコール溶媒は、通常、(I)樹脂、(II)ラジカル発生剤、及び必要に応じて配合される成分(架橋成分等)を十分に溶解可能であるとともに、第一のポジ型感放射線性樹脂組成物を用いて形成した第一のレジストパターンを実質的に溶解しない溶媒である。
本発明のレジストパターンコーティング剤には、任意成分として架橋成分を含有させることが好ましい。架橋成分は、酸の作用により(I)樹脂と反応して、或いは架橋成分どうしで反応して、(I)樹脂を硬化させる作用を示す成分である。
本発明のレジストパターンコーティング剤には、任意成分として界面活性剤を含有させてもよい。界面活性剤を含有させると、レジストパターンコーティング剤の塗布性、消泡性、及びレベリング性等が向上するために好ましい。レジストパターンコーティング剤に界面活性剤を含有させる場合、界面活性剤の含有量は、(I)樹脂100質量部に対して5質量部以下であることが好ましい。
(工程(1))
工程(1)では、シリコンウェハや、SiN又は有機反射防止膜等で被覆されたウェハ等の基板上に、回転塗布、流延塗布、ロール塗布等の適宜の塗布手段によって、後述する第一のポジ型感放射線性樹脂組成物(以下、「第一レジスト剤」ともいう)を塗布する。これにより、第一レジスト剤からなる第一レジスト層を形成することができる。なお、第一レジスト剤を塗布した後、必要に応じてプレベーク(PB)することによって塗膜中の溶剤を揮発させてもよい。このプレベークの加熱条件は、第一レジスト剤の配合組成によって適宜選択されるが、通常、30〜200℃、好ましくは50〜150℃である。
工程(2)では、形成された第一のレジストパターン上に、例えば、回転塗布、流延塗布、ロール塗布等の適宜の塗布手段によってレジストパターンコーティング剤を塗布する。この際、第一のレジストパターンが覆われるようにレジストパターンコーティング剤を塗布する。レジストパターンコーティング剤を塗布した後、加熱処理(ベーク)又はUVキュアする。この加熱処理又はUVキュアによって、第一のレジストパターンと塗布されたレジストパターンコーティング剤を反応させる。加熱条件は、レジストパターンコーティング剤の配合組成によって適宜選択されるが、通常、30〜200℃、好ましくは50〜170℃である。一方、UVキュアに際しては、Ar2ランプ、KrClランプ、Kr2ランプ、XeClランプ、Xe2ランプ(ウシオ電機社製)等のランプを使用することができる。
工程(3)では、図4に示すように、基板10上に形成された不溶化レジストパターン3上に、回転塗布、流延塗布、ロール塗布等の適宜の塗布手段によって後述する第二レジスト剤を塗布し、第二レジスト剤からなる第二レジスト層12を形成する。その後、工程(1)の場合と同様、必要に応じてプレベーク(PB)してもよい。次いで、工程(1)の場合と同様にして、第二レジスト層12、及び必要に応じて第一のレジストパターン(不溶化レジストパターン3)のスペース部を、マスクを介して選択的に露光する。なお、必要に応じて更に加熱処理(PEB)を行ってもよい。
工程(4)では、工程(1)の場合と同様にして現像することにより、ポジ型の第二のレジストパターンを形成する。以上の工程を経ることにより、基板上に第一のレジストパターン(不溶化レジストパターン)と第二のレジストパターンが順次追加された構成のレジストパターンを形成することができる。このようにして形成されたレジストパターンを用いれば、半導体を製造することができる。
上述のレジストパターン形成方法において用いられる「第一のポジ型感放射線性樹脂組成物(第一レジスト剤)」及び「第二のポジ型感放射線性樹脂組成物(第二レジスト剤)」は、いずれも、露光によって酸発生剤から発生した酸の作用により、それぞれに含まれる酸解離性基が解離して、アルカリ現像液に対する溶解性が高くなったレジストの露光部がアルカリ現像液によって溶解、除去され、ポジ型のレジストパターンを得ることができるものである。
酸解離性基を有する樹脂は、下記一般式(5)で表される一種以上の繰り返し単位を含む樹脂であることが好ましい。
酸解離性基を有する樹脂は、所望とする繰り返し単位に対応する重合性不飽和単量体を含む単量体成分を、ヒドロパーオキシド類、ジアルキルパーオキシド類、ジアシルパーオキシド類、アゾ化合物等のラジカル重合開始剤を使用し、必要に応じて連鎖移動剤の存在下、適当な溶媒中で重合することにより製造することができる。
レジスト剤には、下記一般式(6)で表される構造を有する、露光により分解される酸発生剤が含有されていることが好ましい。レジスト剤に酸発生剤が含有されることで、露光により酸が発生し、酸解離性基が解離してレジスト層の露光領域がアルカリ可溶性となり、レジストパターンを形成することができる。
レジスト剤は、酸解離性基を有する樹脂をはじめとする各種成分を溶剤に溶解させたものであることが好ましい。溶剤としては、プロピレングリコールモノメチルエーテルアセテート、2−ヘプタノン、及びシクロヘキサノンからなる群より選択される少なくとも一種(以下、「溶剤(1)」ともいう)が好ましい。また、溶剤(1)以外の溶剤(以下、「その他の溶剤」ともいう)を使用することもできる。更には、溶剤(1)とその他の溶剤を併用することもできる。
レジスト剤には、酸拡散制御剤が含有されていることが好ましい。酸拡散制御剤は、露光により酸発生剤から生じる酸のレジスト層中における拡散現象を制御し、非露光領域における好ましくない化学反応を抑制する作用を有する成分である。このような酸拡散制御剤を配合することにより、レジスト剤の貯蔵安定性が向上し、レジストの解像度が更に向上するとともに、露光から露光後の加熱処理までの引き置き時間(PED)の変動によるレジストパターンの線幅変化を抑えることができ、プロセス安定性に極めて優れた組成物とすることができる。酸拡散制御剤としては、含窒素有機化合物や光崩壊性塩基を用いることが好ましい。この光崩壊性塩基は、露光により分解して酸拡散制御性を失うオニウム塩化合物である。
含窒素有機化合物としては、例えば、下記一般式(7)で表される化合物(以下、「含窒素化合物(I)」ともいう)、同一分子内に二つの窒素原子を有する化合物(以下、「含窒素化合物(II)」ともいう)、同一分子内に三つ以上の窒素原子を有するポリアミノ化合物及びその重合体(以下、まとめて「含窒素化合物(III)」ともいう)、アミド基含有化合物、ウレア化合物、含窒素複素環化合物等を挙げることができる。
光崩壊性塩基は、露光により分解して酸拡散制御性を発現する塩基を発生するオニウム塩化合物である。このようなオニウム塩化合物の具体例としては、下記一般式(8)で表されるスルホニウム塩化合物、及び下記一般式(9)で表されるヨードニウム塩化合物を挙げることができる。
レジスト剤には、必要に応じて、界面活性剤、増感剤、脂肪族添加剤等の各種の添加剤を配合することができる。
第一のレジストパターンが残存していた場合を「○」と評価し、第一のレジストパターンが消失した場合を「×」と評価した。
評価用基板Bで形成された不溶化レジストパターン間に、50nmライン/100nmピッチ(50nm1L/1S)のライン・アンド・スペースパターンが追加形成された場合を「○」と評価した。一方、(i)不溶化レジストパターンが消失した、(ii)第二のレジストパターン形成されなかった、又は(iii)第二のレジストパターンが形成されていても不溶化レジストパターンに溶け残りがあった場合を「×」と評価した。
下記式(L−1)で表される化合物50.16g(50モル%)、下記式(L−2)で表される化合物39.14g(37モル%)、及び下記式(L−3)で表される化合物10.70g(13モル%)を200gの2−ブタノンに溶解し、ジメチル2,2’−アゾビス(2−メチルプロピオネート)5.58gを更に投入して単量体溶液を調製した。100gの2−ブタノンを投入した1000mLの三口フラスコを30分窒素パージした後、撹拌しながら80℃に加熱し、調製した単量体溶液を滴下漏斗にて3時間かけて滴下した。滴下開始を重合開始時間とし、重合反応を6時間実施した。重合反応終了後、重合溶液を水冷することにより、30℃以下に冷却した後、2000gのメタノールへ投入し、析出した白色粉末をろ別した。ろ別した白色粉末を400gのメタノールでスラリー上で2回洗浄した後、ろ別し、50℃で17時間乾燥させて白色粉末の樹脂(A−1)を得た(78g、収率78%)。得られた樹脂(A−1)のMwは5,200であり、Mw/Mnは1.62であり、低分子量成分の残存割合は0.03%であった。また、13C−NMR分析の結果、下記式(A−1)で表される繰り返し単位を有し、それぞれの繰り返し単位の含有率(モル%)は、a/b/c=50.0/37.0/13.0であった。
前記式(L−3)で表される化合物に代えて、下記式(L−4)で表される化合物を19.86g(25モル%)使用したこと、前記式(L−1)で表される化合物を52.47g(50モル%)使用したこと、及び前記式(L−2)で表される化合物を27.66g(25モル%)使用したこと以外は、前述の合成例1と同様にして樹脂(A−2)を得た(78g、収率78%)。得られた樹脂(A−2)のMwは5,490であり、Mw/Mnは1.52であり、低分子量成分の残存割合は0.03%であった。また、13C−NMR分析の結果、下記式(A−2)で表される繰り返し単位を有し、それぞれの繰り返し単位の含有率(モル%)は、a/b/c=50.3/24.7/25.0であった。
前記式(L−1)で表される化合物38.74g(40モル%)、前記式(L−2)で表される化合物61.26g(60モル%)を200gの2−ブタノンに溶解し、ジメチル2,2’−アゾビス(2−メチルプロピオネート)3.58gを更に投入して単量体溶液を調製した。100gの2−ブタノンを投入した1000mLの三口フラスコを30分窒素パージした後、撹拌しながら80℃に加熱し、調製した単量体溶液を滴下漏斗にて3時間かけて滴下した。滴下開始を重合開始時間とし、重合反応を6時間実施した。重合反応終了後、重合溶液を水冷することにより、30℃以下に冷却した後、2000gのメタノールへ投入し、析出した白色粉末をろ別した。ろ別した白色粉末を400gのメタノールでスラリー上で2回洗浄した後、ろ別し、50℃で17時間乾燥させて白色粉末の樹脂(A−3)を得た(78g、収率78%)。得られた樹脂(A−3)のMwは5,400であり、Mw/Mnは1.60であり、低分子量成分の残存割合は0.03%であった。また、13C−NMR分析の結果、下記式(A−3)で表される繰り返し単位を有し、それぞれの繰り返し単位の含有率(mol%)は、a/b=41.0/59.0であった。
前記式(L−1)で表される化合物53.93g(50モル%)、下記式(L−5)で表される化合物10.69g(10モル%)、及び下記式(L−6)で表される化合物35.38g(40モル%)を200gの2−ブタノンに溶解し、ジメチル2,2’−アゾビス(2−メチルプロピオネート)3.58gを更に投入して単量体溶液を調製した。100gの2−ブタノンを投入した1000mLの三口フラスコを30分窒素パージした後、撹拌しながら80℃に加熱し、調製した単量体溶液を滴下漏斗にて3時間かけて滴下した。滴下開始を重合開始時間とし、重合反応を6時間実施した。重合反応終了後、重合溶液を水冷することにより、30℃以下に冷却した後、2000gのメタノールへ投入し、析出した白色粉末をろ別した。ろ別した白色粉末を400gのメタノールでスラリー上で2回洗浄した後、ろ別し、50℃で17時間乾燥させて白色粉末の樹脂(A−4)を得た(82g、収率82%)。得られた樹脂(A−4)のMwは5,800であり、Mw/Mnは1.61であり、低分子量成分の残存割合は0.03%であった。また、13C−NMR分析の結果、下記式(A−4)で表される繰り返し単位を有し、それぞれの繰り返し単位の含有率(モル%)は、53.0/9.8/37.2であった。
前記式(L−2)で表される化合物に代えて、下記式(L−7)で表される化合物を24.42g(15モル%)使用したこと、前記式(L−3)で表される化合物に代えて、下記式(L−8)で表される化合物を30.40g(40モル%)使用したこと、及び前記式(L−1)で表される化合物を45.18g(45モル%)使用したこと以外は、前述の合成例1と同様にして樹脂(A−5)を得た(75g、収率75%)。得られた樹脂(A−5)のMwは6,100であり、Mw/Mnは1.73であり、低分子量成分の残存割合は0.04%であった。また、13C−NMR分析の結果、下記式(A−5)で表される繰り返し単位を有し、それぞれの繰り返し単位の含有率(モル%)は、a/b/c=44.1/15.5/40.4であった。
合成例1〜5で合成した酸解離性基を有する樹脂、酸発生剤、酸拡散制御剤、及び溶剤を使用し、表1に示す配合処方に従って第一レジスト剤(1)〜(4)、及び第二レジスト剤(5)を調製した。
(B−1):1−(4−n−ブトキシナフチル)テトラヒドロチオフェニウムパーフルオロ−n−ブタンスルホネート
(B−2):トリフェニルスルホニウム・ノナフルオロ−n−ブタンスルホネート
(C−1):tert−ブチル−4−ヒドロキシ−1−ピペリジンカルボキシレート
(C−2):トリフェニルスルホニウムサリチレート
(D−1):プロピレングリコールモノメチルエーテルアセテート
(D−2):γ−ブチロラクトン
p−ヒドロキシメタクリルアニリド(m−1)62.13g、p−t−ブトキシスチレン(m−2)37.87g、及びアゾビスイソブチロニトリル(AIBN)10.21gをイソプロパノール(IPA)300gに溶解し、還流条件(82℃)にて6時間重合反応を行なった。反応容器を流水にて冷却した後、酢酸エチル200g、IPA140g、及びメタノール140gを加えて均一化し、更に水を600g加えて1時間静置した。下層に沈降した粘性のポリマーを回収し、50℃で真空乾燥して樹脂(I−1)を得た(収率70%)。得られた樹脂(I−1)のMwは8500、及びMw/Mnは2.08であった。また、13C−NMR分析の結果、得られた樹脂(I−1)に含まれる繰り返し単位の比(モル比)は、(m−1)/(m−2)=55.4/44.6であった。なお、p−ヒドロキシメタクリルアニリド(m−1)、及びp−t−ブトキシスチレン(m−2)の構造を以下に示す。
p−ヒドロキシメタクリルアニリド(m−1)17.62g、p−t−ブトキシスチレン(m−2)10.22g、2−(((トリフルオロメチル)スルホニル)アミノ)エチル−1−メタクリレート(m−3)2.16g、及びAIBN2.18gをIPA90gに溶解し、還流条件(82℃)にて6時間重合反応を行なった。反応容器を流水にて冷却した後、酢酸エチル60g、IPA42g、及びメタノール42gを加えて均一化し、更に水を180g加えて1時間静置した。下層に沈降した粘性のポリマーを回収し、50℃で真空乾燥して樹脂(I−2)を得た(収率77%)。得られた樹脂(I−2)のMwは7800、及びMw/Mnは1.50であった。また、13C−NMR分析の結果、得られた樹脂(I−2)に含まれる繰り返し単位の比(モル比)は、(m−1)/(m−2)/(m−3)=54.2/41.3/4.5であった。なお、2−(((トリフルオロメチル)スルホニル)アミノ)エチル−1−メタクリレート(m−3)の構造を以下に示す。
樹脂(I−1)100部、架橋成分(E−1)5部、架橋成分(E−2)30部、下記式(1−A)で表されるラジカル発生剤1部、溶剤(D−3)524部、及び溶剤(D−4)2096部を混合して3時間撹拌した後、孔径0.03μmのフィルターを使用して濾過することによりレジストパターンコーティング剤(1)を調製した。なお、下記式(1−A)で表されるラジカル発生剤は、下記式(1)中のnが1〜10で表される複数の化合物の混合物である。
表2に示す配合処方としたこと以外は、前述の実施例1の場合と同様にしてレジストパターンコーティング剤(2)〜(6)を調製した。
(E−1):商品名「ニカラックMX−750」(日本カーバイド社製)
(E−2):商品名「OXIPA」(宇部興産社製)
(E−3):ペンタエリスリトールトリアクリレート
(D−3):1−ブタノール
(D−4):4−メチル−2−ペンタノール
12インチシリコンウェハ上に、下層反射防止膜(商品名「ARC29A」、ブルワーサイエンス社製)を、商品名「CLEAN TRACK ACT12」(東京エレクトロン社製)を使用してスピンコートした後、PB(205℃、60秒)を行うことにより膜厚77nmの塗膜を形成した。商品名「CLEAN TRACK ACT12」を使用して第一レジスト剤(1)をスピンコートし、PB(115℃、60秒)した後、冷却(23℃、30秒)することにより膜厚150nmの塗布膜を形成した。次いで、ArF液浸露光装置(商品名「XT1250i」、ASML社製)を使用し、NA:0.85、Outer/Inner=0.89/0.59Annularの光学条件にて、50nmライン/200nmピッチのマスクサイズのマスクを介して露光した。商品名「CLEAN TRACK ACT12」のホットプレート上でPEB(115℃、60秒)した後、冷却(23℃、30秒)し、現像カップのLDノズルにて、2.38%テトラメチルアンモニウムヒドロキシド水溶液を現像液としてパドル現像(30秒間)し、超純水でリンスした。2000rpm、15秒間振り切りでスピンドライすることにより、第一のレジストパターンが形成された評価用基板Aを得た。
表3に示す第一レジスト剤及びレジストパターンコーティング剤をそれぞれ使用し、表3に示す条件としたこと以外は、前述の参考例1と同様にして不溶化レジストパターンが形成された各評価用基板Bを得た。
参考例1で得た評価用基板Bの不溶化レジストパターン上に、第二レジスト剤(5)を商品名「CLEAN TRACK ACT12」を使用してスピンコートし、PB(100℃、60秒)した後、冷却(23℃、30秒)して、膜厚150nmの塗布膜を形成した。ArF液浸露光装置を使用し、NA:0.85、Outer/Inner=0.89/0.59Annularの光学条件にて、50nmライン/200nmピッチのマスクサイズのマスクを介して不溶化レジストパターンのスペース部分を露光した。商品名「CLEAN TRACK ACT12」のホットプレート上でPEB(95℃、60秒)した後、冷却(23℃、30秒)し、現像カップのLDノズルにて、2.38%テトラメチルアンモニウムヒドロキシド水溶液を現像液としてパドル現像(30秒間)し、超純水でリンスした。2000rpm、15秒間振り切りでスピンドライすることにより、第二のレジストパターンが形成された評価用基板Cを得た。得られた評価用基板Cのパターンの評価結果は「○」であり、硬化性能の評価結果は「○」であった。
表4に示す各評価用基板B、及び第二レジスト剤をそれぞれ使用し、表4に示す条件としたこと以外は、前述の実施例7と同様にして第二のレジストパターンが形成された評価用基板Cを得た。得られた評価用基板Cのパターンの評価結果、及び硬化性能の評価結果を表4に示す。
Claims (3)
- ヒドロキシアクリルアニリドとヒドロキシメタクリルアニリドの少なくともいずれかの単量体に由来する構造単位を含む(I)樹脂と、
(II)ラジカル発生剤と、
を含有するレジストパターンコーティング剤。 - (1)第一のポジ型感放射線性樹脂組成物を用いて基板上に形成された第一のレジスト層を選択的に露光した後、現像して、第一のレジストパターンを形成する工程(1)と、
(2)前記第一のレジストパターン上に、請求項1又は2に記載のレジストパターンコーティング剤を塗布し、ベーク又はUVキュア後、洗浄して、前記第一のレジストパターンを、現像液及び第二のポジ型感放射線性樹脂組成物に対して不溶な不溶化レジストパターンとする工程(2)と、
(3)前記第二のポジ型感放射線性樹脂組成物を用いて前記不溶化レジストパターン上に第二のレジスト層を形成し、形成された前記第二のレジスト層を選択的に露光する工程(3)と、
(4)現像して第二のレジストパターンを形成する工程(4)と、を含むレジストパターン形成方法。
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