JPH09208554A - オキシムスルホネート化合物及びレジスト用酸発生剤 - Google Patents
オキシムスルホネート化合物及びレジスト用酸発生剤Info
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Abstract
発生効率が高く、パターン形状、寸法忠実性、露光余裕
度及び耐熱性などに優れるレジストパターンを与える新
規なオキシムスルホネート化合物を提供する。 【解決手段】 一般式 【化1】 (R1及びR2は炭化水素基又は置換基を有する炭化水素
基であり、それらはたがいに同一でも異なっていてもよ
い)で表わされるオキシムスルホネート化合物とする。
Description
ルホネート化合物及びレジスト用酸発生剤に関するもの
であり、さらに詳しくは、レジスト用酸発生剤として有
用なシアノ基をもつオキシムスルホネート基2個を有す
る化合物、及びこの化合物から成るレジスト用酸発生剤
に関するものである。
に関する技術としては、酸硬化性のアミノ樹脂とオキシ
ムスルホネートとを含有する熱硬化性塗布液(ヨーロッ
パ特許出願第44115A1号公報)、酸硬化性樹脂と
オキシムスルホネート化合物を含有する焼き付け仕上げ
材料を短波光で照射し硬化させる方法(特開昭60−6
5072号公報)、重合性エチレン型不飽和基、エポキ
シ基、水酸基などの置換基を有するオキシムスルホネー
ト化合物及びそのポリマー(特開昭61−251652
号公報)、フィルム形成性有機材料とオキシムスルホネ
ート基及び芳香族基を有する感光性物質とから成る組成
物を用いる画像形成方法(特開平1−124848号公
報)、アルカリ可溶性樹脂、オキシムスルホネート化合
物及び感度増強性架橋剤を含むレジスト組成物(特開平
2−154266号公報)、オキシムスルホネート化合
物を用いたネガ型パターンの形成方法(特開平2−16
1444号公報)、オキシムスルホネート化合物を含む
i線用レジスト(特開平6−67433号公報)などが
知られ、これらには以下のシアノ基を有するオキシムス
ルホネート化合物が記載されている。
シイミノ)‐フェニルアセトニトリル
ノ)‐フェニルアセトニトリル
ノ)‐フェニルアセトニトリル
ゼンスルホニルオキシイミノ)‐フェニルアセトニトリ
ル
クロロフェニルアセトニトリル
4‐ジクロロフェニルアセトニトリル
6‐ジクロロフェニルアセトニトリル
メトキシフェニルアセトニトリル
ノ)‐4‐メトキシフェニルアセトニトリル
チエニルアセトニトリル
ミノ)‐フェニルアセトニトリル
4‐メトキシフェニルアセトニトリル
ミノ)‐4‐メトキシフェニルアセトニトリル
トニトリル
受するとスルホン酸エステルの結合が切断され、相当す
るスルホン酸を発生するため、化学増幅型レジストの酸
発生剤として用いられている。
は、1分子から1分子のスルホン酸しか発生しないた
め、添加量に基づく酸発生量が少なく、例えば、ネガ型
レジストに使用した場合、レジストパターンのトップ部
分が細くなり、良好なパターン形状が得られないという
欠点がある上、マスクパターンに対するレジストパター
ンの寸法忠実性、露光余裕度及び耐熱性についても十分
満足しうる結果が得られない。
事情のもとで、レジストの酸発生剤として用いた場合、
酸の発生効率が高く、パターン形状、寸法忠実性、露光
余裕度及び耐熱性などに優れるレジストパターンを与え
る新規なオキシムスルホネート化合物を提供することを
目的としてなされたものである。
の酸発生剤として好適なオキシムスルホネート化合物に
ついて鋭意研究を重ねた結果、シアノ基をもつオキシム
スルホネート基がフェニレン基に2個結合した構造のオ
キシムスルホネート化合物は、レジスト用の酸発生剤と
したときに、酸の発生効率が高く、パターン形状、寸法
忠実性、露光余裕度及び耐熱性などに優れるレジストパ
ターンを与えることを見出し、この知見に基づいて本発
明を完成するに至った。
を有する炭化水素基であり、それらはたがいに同一でも
異なっていてもよい)で表わされるオキシムスルホネー
ト化合物、及びこのオキシムスルホネート化合物から成
るレジスト用酸発生剤を提供するものである。
合物は、前記一般式(I)で表わされる文献未載の新規
な化合物であって、一般式(I)において、R1及びR2
の炭化水素基は、芳香族炭化水素基、脂肪族炭化水素
基、脂環式炭化水素基のいずれでもよい。この芳香族炭
化水素基としては、炭素数6〜14のものが好ましく、
置換基を有していても有さなくてもよい。このようなも
のとしては、例えばフェニル基、トリル基、メトキシフ
ェニル基、キシリル基、ビフェニル基、ナフチル基、ア
ントリル基などが挙げられる。また、脂肪族炭化水素基
は不飽和のもの飽和のもののいずれでもよいし、直鎖
状、枝分れ状のいずれでもよいが、炭素数1〜12のも
のが好ましい。この脂肪族炭化水素基の例としては、メ
チル基、エチル基、プロピル基、イソプロピル基、n‐
ブチル基、sec‐ブチル基、tert‐ブチル基、n
‐ペンチル基、n‐オクチル基、n‐ドデシル基、エテ
ニル基、プロペニル基、ブテニル基、ブタジエニル基、
ヘキセニル基、オクタジエニル基などを挙げることがで
きる。さらに脂環式炭化水素基の例としては、シクロペ
ンチル基、シクロヘキシル基、シクロオクチル基、シク
ロドデシル基を、シクロアルケニル基の例としては、1
‐シクロブテニル基、1‐シクロペンテニル基、1‐シ
クロヘキセニル基、1‐シクロヘプテニル基、1‐シク
ロオクテニル基などを挙げることができる。
を有するものでもよい。この置換基としては塩素原子、
臭素原子、フッ素原子などのハロゲン原子、水酸基、ア
シル基、アルコキシル基などがある。置換基を有する炭
化水素基の中で、特に好ましい例は、ハロゲン化炭化水
素基、例えばクロロメチル基、トリクロロメチル基、ト
リフルオロメチル基、2‐ブロモプロピル基のような炭
素数1〜4のハロゲン化アルキル基である。なお、該R
1及びR2はたがいに同一であってもよいし、異なってい
てもよい。
1分子から2分子のスルホン酸を発生するため、同一露
光量でも酸の発生効率が高い。また、このオキシムスル
ホネート化合物の分子が大きすぎると耐熱性が悪くなる
傾向があるので、R1及びR2は、共にアルキル基やハロ
ゲン化アルキル基の場合が好ましい。このようなオキシ
ムスルホネート化合物は、露光光に対する透明性が高
く、レジスト中の添加量を増やしてもレジストの透明性
を下げないため、感度を向上させることができる上、解
像度や断面形状の優れたレジストパターンを与える。レ
ジストパターン形状に起因する露光後加熱処理(Pos
t exposure bake)時における酸の拡散
しやすさを考慮すると、R1及びR2がアルキル基やハロ
ゲン化アルキル基であるもの、中でも炭素数1〜4の低
級アルキル基や炭素数1〜4の低級ハロゲン化アルキル
基が好ましい。
ムスルホネート化合物は、それ自体公知の方法を参考に
して、製造することができる。すなわち、テトラヒドロ
フラン、N,N‐ジメチルホルムアミド、N,N‐ジメ
チルアセトアミド、N‐メチルピロリドンなどの有機溶
媒中において、ピリジン、トリエチルアミンなどの塩基
性触媒の存在下、オキシム基含有化合物とスルホン酸ク
ロリド基含有化合物とをエステル化反応することにより
製造できる。また、原料として用いられるオキシム基含
有化合物は、公知の方法[「ザ・システマティック・ア
イデンティフィケイション・オブ・オーガニック・コン
パウンズ(The Systematic Ident
ification of Organic Comp
ounds)」(John Wiley & Son
s),第181ページ(1980年)、「ディ・マクロ
モレキュラレ・ヘミー(Die Makromolec
ulare Chemie)」,第108巻,第170
ページ(1967年)、「オーガニック・シンセシス
(Organic Synthesis)」,第59
巻,第95ページ(1979年)]に記載されている方
法によって製造することができる。
ムスルホネート化合物の例としては、次に示すものを挙
げることができる。
れるオキシムスルホネート化合物から成るレジスト用酸
発生剤をも提供するものであり、このレジスト用酸発生
剤をフィルム形成性物質と混合して、レジスト用感光性
組成物を調製することができる。この際の配合量として
は、フィルム形成性物質100重量部に対し、1〜30
重量部が適当である。
は、文献未載の新規な化合物であって、レジストの酸発
生剤として有用である。すなわち、レジストの酸発生剤
として用いた場合、酸の発生効率が高く、パターン形
状、寸法忠実性、露光余裕度及び耐熱性などに優れるレ
ジストパターンを与えることができるといった効果が発
揮される。
明するが、本発明は、これらの例によってなんら限定さ
れるものではない。
た。ビス(α‐ヒドロキシイミノ)‐p‐フェニレンジ
アセトニトリル20g(0.093モル)と、トリエチ
ルアミン22.6g(0.233モル)を含むテトラヒ
ドロフラン200mlとを反応容器に入れ、この溶液を
−5℃に冷却したのち、メシルクロリド 26.7g
(0.233モル)を2時間かけて滴下した。反応混合
物を−5℃で2時間かきまぜたのち、約25℃でさらに
20時間かきまぜた。次いで、テトラヒドロフランを真
空下30℃で留去したのち、得られた生成物22gをア
セトニトリルから繰り返し再結晶し、融点263℃の白
色結晶12.5g(理論量の36.3%)を得た。
た結果、769cm-1、840cm -1、1189c
m-1、1382cm-1、2240cm-1にピークが認め
られた。またプロトン核磁気共鳴スペクトル(1H−N
MR)を測定した結果(溶媒:ジメチルスルホキシド‐
d6)、3.68ppm、8.15ppmにピークが認
められた。さらに、紫外線吸収スペクトルを測定した結
果(溶媒:テトラヒドロフラン)、λmax=220n
m、ε=7900、λmax=301nm、ε=1220
0であった。
た。実施例1において、ビス(α‐ヒドロキシイミノ)
‐p‐フェニレンジアセトニトリルの代わりにビス(α
‐ヒドロキシイミノ)‐m‐フェニレンジアセトニトリ
ルを用いた以外は、実施例1と同様にして反応を行い、
得られた生成物30gをアセトニトリルから繰り返し再
結晶し、融点196℃の白色結晶25.8g(理論量の
72.0%)を得た。
た結果、782cm-1、844cm -1、1191c
m-1、1382cm-1、2238cm-1にピークが認め
られた。また、1H−NMRを測定した結果(溶媒:ジ
メチルスルホキシド‐d6)、3.65ppm、7.8
9ppm、8.27ppm、8.29ppmにピークが
認められた。さらに、紫外線吸収スペクトルを測定した
結果(溶媒:テトラヒドロフラン)、λmax=211n
m、ε=6500、λmax=269nm、ε=1210
0であった。
た。実施例1において、ビス(α‐ヒドロキシイミノ)
‐p‐フェニレンジアセトニトリルの代わりにビス(α
‐ヒドロキシイミノ)‐m‐フェニレンジアセトニトリ
ルを用い、かつメシルクロリドの代わりに1‐ブタンス
ルホニルクロリド36.3g(0.233モル)を用い
た以外は、実施例1と同様にして反応を行い、得られた
生成物32gをアセトニトリルから繰り返し再結晶し、
融点98℃の白色結晶20.5g(理論量の48.5
%)を得た。
た結果、783cm-1、844cm -1、1191c
m-1、1382cm-1、2239cm-1にピークが認め
られた。また、1H−NMRを測定した結果(溶媒:ア
セトン‐d6)、0.98ppm、1.52ppm、
1.92ppm、3.70ppm、7.91ppm、
8.27ppm、8.40ppmにピークが認められ
た。さらに、紫外線吸収スペクトルを測定した結果(溶
媒:テトラヒドロフラン)、λmax=211nm、ε=
7100、λmax=268nm、ε=13500であっ
た。
た。ビス(α‐ヒドロキシイミノ)‐m‐フェニレンジ
アセトニトリル10g(0.0465モル)と、トリエ
チルアミン11.3g(0.116モル)を含むテトラ
ヒドロフラン200mlとを反応容器に入れ、この溶液
を−5℃に冷却したのち、p‐トルエンスルホニルクロ
リド22.1g(0.116モル)を2時間かけて滴下
した。反応混合物を−5℃で2時間かきまぜたのち、約
25℃でさらに20時間かきまぜた。次いで、テトラヒ
ドロフランを真空下30℃で留去したのち、得られた生
成物12gをアセトニトリルから繰り返し再結晶し、融
点205℃の白色結晶10g(理論量の41.3%)を
得た。
た結果、773cm-1、836cm -1、1197c
m-1、1394cm-1、2237cm-1にピークが認め
られた。また、1H−NMRを測定した結果(溶媒:ジ
メチルスルホキシド‐d6)、2.42ppm、7.5
2ppm、7.77ppm、7.98ppmにピークが
認められた。さらに、紫外線吸収スペクトルを測定した
結果(溶媒:テトラヒドロフラン)、λmax=230n
m、ε=24000、λmax=270nm、ε=173
00であった。
た。実施例2において、メシルクロリドの代わりに無水
トリフルオロメタンスルホン酸64.7g(0.233
モル)を用いた以外は、実施例2と同様にして上記オキ
シムスルホネート化合物を得た。
た。実施例4において、p‐トルエンスルホニルクロリ
ドの代わりに4‐メトキシベンゼンスルホニルクロリド
24.0g(0.116モル)を用いた以外は、実施例
4と同様にして上記オキシムスルホネート化合物を得
た。
ンとの共重合体100重量部及びメラミン樹脂であるM
w−30(三和ケミカル社製)15重量部をプロピレン
グリコールモノメチルエーテルアセテート384重量部
とN‐メチル‐2‐ピロリドン96重量部との混合溶剤
に溶解し、これに酸発生剤として、実施例2で得られた
化合物3重量部を溶解してネガ型レジスト溶液を得た。
いてシリコンウエーハ上に塗布し、ホットプレート上で
90℃にて90秒間乾燥することにより、膜厚1.0μ
mのレジスト層を形成した。次いで、縮小投影露光装置
NSR−2005i10D(ニコン社製)により、レベ
ンソン型位相シフトマスクを介してi線(365nm)
を選択的に照射したのち、100℃、90秒間露光後加
熱(PEB)処理し、次いで、2.38重量%テトラメ
チルアンモニウムヒドロキシド水溶液で65秒間現像
し、30秒間水洗して乾燥した。現像後の形成された
0.30μmのレジストパターンの断面形状をSEM
(走査型電子顕微鏡)写真により、観察したところ、基
板に対して垂直な矩形のレジストパターンであった。ま
た、露光余裕度として(Eop/Eg)を求めたとこ
ろ、1.70であった。なお、Eopとは、0.30μ
mのラインアンドスペースが1:1に形成される露光量
であり、Egは0.30μmのマスクパターンの露光部
が像形成され始める露光時間である。
た化合物の代わりにα‐(4‐トルエンスルホニルオキ
シイミノ)‐4‐メトキシフェニルアセトニトリル3重
量部を用いた以外は、実施例7と同様にしてネガ型レジ
スト溶液を調製した。
な条件でパターニングした。形成された0.30μmの
レジストパターンの断面形状をSEM(走査型電子顕微
鏡)写真により、観察したところ、トップ部分が細くな
ったレジストパターンであった。また、露光余裕度につ
いても実施例7と同様にして求めたところ、1.60で
あった。
ン縮合物であるクレゾールノボラック樹脂100重量部
及びメラミン樹脂であるMw−30(三和ケミカル社
製)10重量部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270重量部に溶解し、これに酸発生剤
として、実施例2で得た化合物1.5重量部を溶解して
ネガ型レジスト溶液を得た。
いてシリコンウエーハ上に塗布し、ホットプレート上で
90℃にて90秒間乾燥することにより、膜厚2.0μ
mのレジスト層を形成した。次いで、縮小投影露光装置
NSR−2005i10D(ニコン社製)により、i線
(365nm)を選択的に照射したのち、100℃で9
0秒間PEB処理したのち、2.38重量%テトラメチ
ルアンモニウムヒドロキシド水溶液で65秒間現像し、
30秒間水洗して乾燥した。この際、0.80μmのラ
インアンドスペースが1:1に形成される露光時間を感
度としてmJ/cm2(エネルギー量)単位で測定した
ろころ、75mJ/cm2であった。
μmのレジストパターンの断面形状をSEM(走査型電
子顕微鏡)写真により、観察したところ、基板に対して
垂直な矩形のレジストパターンであった。また、寸法忠
実性として1μmのラインアンドスペースが1:1に形
成される時間を上記感度で割った値を求めたところ、
1.15であった。また、耐熱性として0.8μmのレ
ジストパターンをホットプレート上で加熱しレジストパ
ターンがフローする温度を求めたところ、200℃であ
った。
た化合物の代わりにα‐(4‐トルエンスルホニルオキ
シイミノ)フェニルアセトニトリル3重量部を用いた以
外は、実施例8と同様にしてネガ型レジスト溶液を調製
した。
な条件でパターニングし、同様な定義の感度を測定した
ところ、300mJ/cm2であった。
μmのレジストパターンの断面形状をSEM(走査型電
子顕微鏡)写真により、観察したところ、トップ部分が
細くなったレジストパターンであった。また、寸法忠実
性、耐熱性についても実施例8と同様にして求めたとこ
ろ、1.35と140℃であった。
た化合物の代わりに実施例3で得られた化合物1.5重
量部を用いた以外は、実施例8と同様にしてネガ型レジ
スト溶液を調製した。
な条件でパターニングし、同様な定義の感度を測定した
ところ、65mJ/cm2であった。
μmのレジストパターンの断面形状をSEM(走査型電
子顕微鏡)写真により、観察したところ、基板に対して
垂直な矩形のレジストパターンであった。さらに、寸法
忠実性、耐熱性についても実施例8と同様にして求めた
ところ、1.18と200℃であった。
Claims (4)
- 【請求項1】 一般式 【化1】 (式中のR1及びR2は、それぞれ炭化水素基又は置換基
を有する炭化水素基であり、それらはたがいに同一でも
異なっていてもよい)で表わされるオキシムスルホネー
ト化合物。 - 【請求項2】 R1及びR2が非芳香族性炭化水素基又は
ハロゲン化非芳香族性炭化水素基である請求項1記載の
オキシムスルホネート化合物。 - 【請求項3】 R1及びR2が共に低級アルキル基又はハ
ロゲン化低級アルキル基である請求項2記載のオキシム
スルホネート化合物。 - 【請求項4】 一般式 【化2】 (式中のR1及びR2は、それぞれ炭化水素基又は置換基
を有する炭化水素基であり、それらはたがいに同一でも
異なっていてもよい)で表わされるオキシムスルホネー
ト化合物から成るレジスト用酸発生剤。
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JP01800796A JP3798458B2 (ja) | 1996-02-02 | 1996-02-02 | オキシムスルホネート化合物及びレジスト用酸発生剤 |
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JPH09208554A true JPH09208554A (ja) | 1997-08-12 |
JP3798458B2 JP3798458B2 (ja) | 2006-07-19 |
Family
ID=11959632
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