JP2004318115A - ポジ型レジスト組成物及びそれを用いたパターン形成方法 - Google Patents
ポジ型レジスト組成物及びそれを用いたパターン形成方法 Download PDFInfo
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- JP2004318115A JP2004318115A JP2004090296A JP2004090296A JP2004318115A JP 2004318115 A JP2004318115 A JP 2004318115A JP 2004090296 A JP2004090296 A JP 2004090296A JP 2004090296 A JP2004090296 A JP 2004090296A JP 2004318115 A JP2004318115 A JP 2004318115A
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Landscapes
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
- Materials For Photolithography (AREA)
Abstract
【解決手段】 特定の2種のアセタール構造を有する繰り返し単位を有し、酸の作用によって分解してアルカリ現像液に対する溶解性が増大するポリマー、活性光線又は放射線の照射により酸を発生する化合物、および溶剤を含有するポジ型フォトレジスト組成物。
【選択図】 なし
Description
特許文献2(特開平4−219757号公報)には、同様にポリ(p−ヒドロキシスチレン)のフェノール性ヒドロキシ基の20〜70%がアセタール基で置換されたポリマーを含有するレジスト組成物が開示されている。
また、特許文献3(特開2002−323768号)には、真空中の露光後引き起きにおけるパターン線幅安定性が改良されたレジスト組成物が開示されている。
ラインエッジラフネスとは、レジスト組成物の特性に起因して、レジスト組成物のラインパターンと基板界面のエッジが、ライン方向と垂直な方向に不規則に変動した形状を呈することを言う。このパターンを真上から観察するとエッジが凸凹(±数十nm程度)に見える。この凸凹は、エッチング工程により基板に転写されるため、凸凹が大きいと電気特性不良を引き起こし、歩留まりを低下させる原因となっている。レジストパターンサイズがクオーターミクロン以下になるに伴い、ラインエッジラフネスの改善要求が高まってきている。
また、真空中の露光後引き起きにおけるパターン線幅安定性(真空中PED)は、電子線やX線のような真空中での露光を行う場合に非常に重要な性能であり、真空中PED特性が悪いと、電子線やX線描画の際に、描画の初期と描画の終了時とで性能が大きく変化し、結果として描画パターンの線幅の面内均一性が大きくばらつき、歩留りの著しい低下を引き起こしてしまう。
また、上述のラインエッジラフネスに関しても真空中の引き置きで悪化するという問題があった。
また、EUVを光源とする場合、光の波長が極紫外領域に属し、高エネルギーを有するため、EUV光に起因するネガ化等の光化学反応が協奏することによるコントラスト低下等の問題があった。
従来知られている技術の組合せにおいては、電子線又はX線照射下で充分良好なラインエッジラフネスと、良好な真空中PED特性(線幅変動、ラインエッジラフネス変動)を併せ持つことは困難であり、これらの両立が望まれていた。また、EUV照射下においても、充分良好な感度とコントラストを併せ持つことが望まれていた。
(1)(a)下記一般式(I)、(II)及び(III)で表される繰り返し単位を有し、酸の作用により分解してアルカリ現像液に対する溶解性が増大するポリマー、(b)活性光線又は放射線の照射により酸を発生する化合物、及び(c)溶剤を含有することを特徴とする電子線、X線又はEUV用ポジ型レジスト組成物。
ただし、ZとWが同一となることはない。
(3)ポリマー(a)の分子量分散度が1.5以下であることを特徴とする上記(1)または(2)に記載の電子線、X線又はEUV用ポジ型レジスト組成物。
(4)ポリマー(a)が、さらに、(メタ)アクリル酸3級アルキルエステルを繰り返し単位として含有するポリマーであることを特徴とする上記(1)〜(3)のいずれかに記載の電子線、X線又はEUV用ポジ型レジスト組成物。
(5)酸を発生する化合物(b)が、組成物中の固形分を基準として2〜10質量%含まれることを特徴とする、上記(1)〜(4)のいずれかに記載の電子線、X線又はEUV用ポジ型レジスト組成物。
(6) 上記(1)〜(5)のいずれかに記載のレジスト組成物によりレジスト膜を形成し、該レジスト膜を露光、現像することを特徴とするパターン形成方法。
本発明の電子線、X線又はEUV用ポジ型レジスト組成物は、上記一般式(I)、(II)及び(III)で表される繰り返し単位を有し、酸の作用により分解してアルカリ現像液に対する溶解性が増大するポリマー(a)、活性光線または放射線の照射により酸を発生する化合物(b)及び溶剤(c)を少なくとも含有する。
尚、本明細書において、「活性光線または放射線」には、電子線、X線、およびEUVを含む。
本発明で使用される酸分解性ポリマー(a)は、下記一般式(I)、(II)及び(III)で表される繰り返し単位を有する。
ただし、ZとWが同一となることはない。
上記アリールオキシエチル基の例としては、フェニルオキシエチル基、シクロヘキシルフェニルオキシエチル基等を挙げることができる。これらの基はさらに置換基を有していても良い。
上記アラルキルカルボニルオキシエチル基の例としては、ベンジルカルボニルオキシエチル基等を挙げることができる。これらの基はさらに置換基を有していても良い。
本発明における酸分解性ポリマー(a)は、ZとWが同一となることはない。
本発明において、好ましくはWが脂環式基又は芳香族基を有する基であることが好ましい。この場合、Zは、直鎖状あるいは分岐状のアルキル基であることが好ましい。これにより、本発明の効果が一層顕著になる。
ここで、脂環式基としては、シクロペンチル基、シクロヘキシル基、シクロヘプチル基、シクロオクチル基、シクロノニル基、シクロデカニル基等の炭素数5個〜12個のものが好ましい。また、芳香族基としては、フェニル基、ナフチル基等の炭素数6個〜16個のものが好ましく、これらの基はたとえば、メチルフェニル基、エチルフェニル基などのように更に置換基を有していてもよい。これらの脂環式基又は芳香族基は、そのものでWに相当する基として成り立ってもよいが、アルキレン基や他の連結基を有していてもよい。
Wの脂環式基又は芳香族基を有する基としては、フェノキシエチル基、シクロヘキシルフェノキシエチル基、シクロヘキシルチオエチル基、t−ブチルシクロヘキシルカルボニルオキシエチル基、n−ブチルシクロヘキシルカルボニルオキシエチル基、シクロヘキサノン−4−イル−フェノキシエチル基、シクロヘキシル基、シクロヘキシルエチル基、フェネチル基、ベンジル基が好ましい。
Zの直鎖状あるいは分岐状のアルキル基としては、エチル基、プロピル基、イソプロピル基、n−ブチル基、i−ブチル基、t−ブチル基等が好ましい。
上記のように置換アルキル基や置換アラルキル基は末端にフェニル基やシクロヘキシル基のような嵩高い基を導入することで、更にエッジラフネスの向上も認められる。
酸分解性ポリマー(a)中の、一般式(I)で表される繰り返し単位と一般式(II)で表される繰り返し単位の含有比率((I):(II))は、好ましくは0.10:1〜1:0.10であり、より好ましくは0.25:1〜1:0.25である。
また、t−ブチルアクリレートもしくはt−ブチルメタクリレート等の酸分解性の(メタ)アクリル酸3級アルキルエステルに由来する繰り返し単位を含んでいることも好ましい。
これらの置換基は、下記に示す置換基によって置換されていてもよい。
これらの置換基は、下記に示す置換基によって置換されていてもよい。
これらの置換基は、下記に示す置換基によって置換されていてもよい。
これらの置換基は、下記に示す置換基によって置換されていてもよい。
反応溶媒は、フェノール性水酸基を有するポリマー100質量部に対して、通常100〜1000質量部用いられる。
本発明で使用される光酸発生剤(b)としては、光カチオン重合の光開始剤、光ラジカル重合の光開始剤、色素類の光消色剤、光変色剤、あるいはマイクロレジスト等に使用されている公知の光(400〜200nmの紫外線、遠紫外線、好ましくは、g線、h線、i線、KrFエキシマレーザー光)、ArFエキシマレーザー光、F2エキシマレーザー(157nm)、EUV(13nm)、電子線、X線、分子線またはイオンビームにより酸を発生する化合物及びそれらの混合物を適宜に選択して使用することができる。
(1)トリハロメチル基が置換した下記一般式(PAG1)で表されるオキサゾール誘導体または一般式(PAG2)で表されるS−トリアジン誘導体。
R203、R204、R205は各々独立に、置換もしくは未置換のアルキル基、アリール基を示す。
本発明の電子線、X線又はEUV用ポジ型レジスト組成物には、樹脂成分として前記酸分解性ポリマー(a)以外に酸分解性基を含有していないアルカリ可溶性樹脂を配合することができ、これにより感度が向上する。
好ましい化学的環境として、下記式(A)〜(E)構造を挙げることができる。
アルキレン基としては、炭素数2〜10個が好ましく、より好ましくは2〜5個のものである。アルキレン基の置換基としては、炭素数1〜6個のアルキル基、アリール基、アルケニル基の他、ハロゲン原子、ハロゲン置換アルキル基が挙げられる。更に、一般式(F)で示される化合物の具体例としては、下記に示す化合物が挙げられる。
日本曹達(株)製のポリ(p−ヒドロキシスチレン)(樹脂R−1)(分子量8000、分散度1.05)50gをプロピレングリコールモノメチルエーテルアセテート(PGMEA)240gに溶解し、この溶液を60℃、20mmHgまで減圧して約40gの溶剤を系中に残存している水と共に留去した。20℃まで冷却し、エチルビニルエーテル6.1g、別途合成したシクロヘキシルフェノキシエチルビニルエーテル4.0gとパラトルエンスルホン酸0.02gを添加し、室温にて1時間撹拌した。その後、トリエチルアミン0.02gを添加して中和し、酢酸エチル240g、水140gにより抽出操作を3回行った。
得られたポリマーをB−1とした。
表1に示すフェノール性水酸基を有するポリマー(幹ポリマー)、2種の各各のアルキルビニルエーテルを用いた以外は合成例2と同様にして酸分解性ポリマーを合成し、得られたポリマーをB−2〜B−10とした。
また、比較例用樹脂(C−1)を、アルキルビニルエーテルを表1に記載の1種のみを用いる以外は、上記と同様にして合成した。
R−2:ポリ(p−ヒドロキシスチレン/p−アセトキシスチレン)樹脂、組成比85/15、分子量9000、分散度1.4
R−3:ポリ(p−ヒドロキシスチレン/t−ブチルアクリレート)樹脂、分子量10000、組成比85/15、分散度1.5
R−4:ポリ(p−ヒドロキシスチレン/スチレン)樹脂、組成比95/5、分子量10000、分散度1.5
R’−1:ポリ(p−ヒドロキシスチレン)、分子量8000、分散度2.0
下記表2に示す各成分をPGMEA8.4gに溶解し、0.1μmのフィルターで濾過してポジ型レジスト組成物を調製した。酸分解性ポリマーは全てPGMEA溶液をそれぞれ7.66g用いた。
このレジスト膜に、電子線描画装置((株)日立製作所製HL750、加速電圧50KeV)を用いて電子線照射を行った。照射後に110℃、90秒ベークし、2.38質量%テトラメチルアンモニウムハイドロオキサイド(TMAH)水溶液を用いて60秒間浸漬した後、30秒間、水でリンスして乾燥した。
得られたパターンの断面形状を走査型電子顕微鏡((株)日立製作所製S−4300)を用いて観察した。0.15μmライン(ライン:スペース=1:1)を解像する照射量における限界解像力(ラインとスペースが分離解像)を解像力とした。
真空チャンバー内にウェハをセット、上記感度を示す照射量にて電子線照射、照射直後又は3時間後に、上記のように110℃、90秒ベーク(加熱処理)した後、現像処理を行いラインパターンを得た。そして、電子線照射直後にベークを行い現像処理し得られた0.15μmラインパターンと、電子線照射3時間後にベークを行い現像処理をし得られた0.15μmラインパターンについて、走査型電子鞍微鏡((株)日立製作所製S−9220)にて線幅の変動及びラインエッジラフネス(LER)の変化を測定(0.15μmのラインパターンの長手方向のエッジ5μmの範囲について、エッジがあるべき基準線からの距離を50ポイント測定し、標準偏差を求め、3σを算出)した。
結果を表3に示す。
実施例21、22及び比較例2
上記実施例1〜2及び比較例1の各レジスト組成物を用い、実施例1と同様の方法でレジスト膜を得た。但し、レジスト膜厚は0.25μmとした。得られたレジスト膜にEUV光(波長13nm)を用いて、露光量を0〜5.0mJの範囲で0.5mJづつ変えながら面露光を行い、さらに110℃、90秒ベークした。その後2.38%テトラメチルアンモニウムハイドロオキサイド(TMAH)水溶液を用いて、各露光量での溶解速度を測定し、感度曲線を得た。この感度曲線において、レジストの溶解速度が飽和するときの露光量を感度とし、また感度曲線の直線部の勾配から溶解コントラスト(γ値)を算出した。γ値が大きいはど溶解コントラストに優れている。
結果を表3に示す。
Claims (6)
- (a)下記一般式(I)、(II)及び(III)で表され
る繰り返し単位を有し、酸の作用により分解してアルカリ現像液に対する溶解性が増大するポリマー、(b)活性光線又は放射線の照射により酸を発生する化合物、及び(c)溶剤を含有することを特徴とする電子線、X線又はEUV用ポジ型レジスト組成物。
上記式中、L1〜L4は同一でも異なっていてもよく、水素原子、直鎖、分岐もしくは環状のアルキル基、又はアラルキル基を表す。Zは、直鎖、分岐もしくは環状のアルキル基、又はアラルキル基を表す。Wは、Zと同義である。ZとL1、WとL4は、互いに結合して5又は6員環を形成してもよい。
ただし、ZとWが同一となることはない。 - 式(II)におけるWが脂環式基又は芳香族基を有する基であることを特徴とする請求項1記載の電子線、X線又はEUV用ポジ型レジスト組成物。
- ポリマー(a)の分子量分散度が1.5以下であることを特徴とする請求項1または2に記載の電子線、X線又はEUV用ポジ型レジスト組成物。
- ポリマー(a)が、さらに、(メタ)アクリル酸3級アルキルエステルを繰り返し単位として含有するポリマーであることを特徴とする請求項1〜3のいずれかに記載の電子線、X線又はEUV用ポジ型レジスト組成物。
- 酸を発生する化合物(b)が、レジスト組成物中の全固形分を基準として2〜10質量%含まれることを特徴とする、請求項1〜4のいずれかに記載の電子線、X線又はEUV用ポジ型レジスト組成物。
- 請求項1〜5のいずれかに記載のレジスト組成物によりレジスト膜を形成し、該レジスト膜を露光、現像することを特徴とするパターン形成方法。
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004246326A (ja) * | 2002-11-22 | 2004-09-02 | Fuji Photo Film Co Ltd | ポジ型レジスト組成物及びそれを用いたパターン形成方法 |
| JP2009003242A (ja) * | 2007-06-22 | 2009-01-08 | Sumitomo Chemical Co Ltd | 化学増幅型ポジ型レジスト組成物及びヒドロキシスチレン誘導体 |
| WO2009011364A1 (ja) * | 2007-07-18 | 2009-01-22 | Asahi Glass Company, Limited | 電子線、x線またはeuv光を用いたリソグラフィー法に用いられるレジスト組成物 |
| JP2010181857A (ja) * | 2008-08-13 | 2010-08-19 | Tokyo Ohka Kogyo Co Ltd | ポジ型レジスト組成物及びレジストパターン形成方法、並びに高分子化合物 |
| JP2012118554A (ja) * | 2012-01-17 | 2012-06-21 | Sumitomo Chemical Co Ltd | 化学増幅型ポジ型レジスト組成物 |
| EP2707776A4 (en) * | 2011-05-12 | 2015-01-21 | Fujifilm Corp | POSITIVE LACQUER COMPOSITION AND PAINTING FILM, PAINT-COATED MASK ROLLING, PAINT-STRUCTURE-FORMING METHOD AND PHOTOMASK WITH THE COMPOSITION |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004246326A (ja) * | 2002-11-22 | 2004-09-02 | Fuji Photo Film Co Ltd | ポジ型レジスト組成物及びそれを用いたパターン形成方法 |
| JP2009003242A (ja) * | 2007-06-22 | 2009-01-08 | Sumitomo Chemical Co Ltd | 化学増幅型ポジ型レジスト組成物及びヒドロキシスチレン誘導体 |
| WO2009011364A1 (ja) * | 2007-07-18 | 2009-01-22 | Asahi Glass Company, Limited | 電子線、x線またはeuv光を用いたリソグラフィー法に用いられるレジスト組成物 |
| JP2010181857A (ja) * | 2008-08-13 | 2010-08-19 | Tokyo Ohka Kogyo Co Ltd | ポジ型レジスト組成物及びレジストパターン形成方法、並びに高分子化合物 |
| EP2707776A4 (en) * | 2011-05-12 | 2015-01-21 | Fujifilm Corp | POSITIVE LACQUER COMPOSITION AND PAINTING FILM, PAINT-COATED MASK ROLLING, PAINT-STRUCTURE-FORMING METHOD AND PHOTOMASK WITH THE COMPOSITION |
| JP2012118554A (ja) * | 2012-01-17 | 2012-06-21 | Sumitomo Chemical Co Ltd | 化学増幅型ポジ型レジスト組成物 |
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