JP4752794B2 - 感放射線性樹脂組成物及び感放射線性樹脂組成物用重合体 - Google Patents
感放射線性樹脂組成物及び感放射線性樹脂組成物用重合体 Download PDFInfo
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- JP4752794B2 JP4752794B2 JP2007058661A JP2007058661A JP4752794B2 JP 4752794 B2 JP4752794 B2 JP 4752794B2 JP 2007058661 A JP2007058661 A JP 2007058661A JP 2007058661 A JP2007058661 A JP 2007058661A JP 4752794 B2 JP4752794 B2 JP 4752794B2
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Description
Proc.SPIE,2006,61530H Proc.SPIE,2006,61531L
本発明の感放射線性樹脂組成物の一実施形態は、下記一般式(1)で表される繰り返し単位(以下、「繰り返し単位(1)」ということがある。)を含み酸の作用によりアルカリ可溶性となる樹脂(A)、感放射線性酸発生剤(B)、及び溶剤(C)を含有するものである。
本実施形態の感放射線性樹脂組成物に含有される樹脂(A)は、酸の作用によりアルカリ可溶性となるものである。そして、樹脂(A)「酸の作用によりアルカリ可溶性となる」というときは、樹脂(A)はアルカリ不溶性又はアルカリ難溶性であるが、酸と反応することによりアルカリ可溶性になることを意味する。ここで「アルカリ不溶性又はアルカリ難溶性」とは、樹脂(A)を含有する感放射線性樹脂組成物から形成されたレジスト被膜からレジストパターンを形成する際に採用されるアルカリ現像条件下で、当該レジスト被膜の代わりに樹脂(A)のみを用いた被膜を現像した場合に、当該被膜の初期膜厚の50%以上が現像後に残存する性質を意味する。上記樹脂(A)が、酸の作用によりアルカリ可溶性となる条件は、樹脂(A)中に、繰り返し単位(1)が、10〜90%、好ましくは10〜80%、更に好ましくは20〜80%含むことである。さらに樹脂(A)中に、下記一般式(2)で表される繰り返し単位(以下、「繰返し単位(2)」ということがある)が、10〜90%含まれることが好ましく、10〜80%含まれることが更に好ましく、20〜80%含まれることが更に好ましい。
本実施形態の感放射線性樹脂組成物に含有される感放射線性酸発生剤(以下、単に「酸発生剤」ということがある。)は、露光により酸を発生するものであり、光酸発生剤として機能する。この酸発生剤は、露光により酸を発生し、発生した酸により、感放射線性樹脂組成物に含有される樹脂(A)中に存在する酸解離性基を解離させて(保護基を脱離させて)、樹脂(A)をアルカリ可溶性とする。そしてその結果、レジスト被膜の露光部がアルカリ現像液に易溶性となり、これによりポジ型のレジストパターンが形成される。
オニウム塩化合物としては、例えば、ヨードニウム塩、スルホニウム塩、ホスホニウム塩、ジアゾニウム塩、ピリジニウム塩等を挙げることができる。オニウム塩化合物の具体例としては、ジフェニルヨードニウムトリフルオロメタンスルホネート、ジフェニルヨードニウムノナフルオロ−n−ブタンスルホネート、ジフェニルヨードニウムパーフルオロ−n−オクタンスルホネート、ジフェニルヨードニウム2−ビシクロ[2.2.1]ヘプタ−2−イル−1,1,2,2−テトラフルオロエタンスルホネート、ビス(4−t−ブチルフェニル)ヨードニウムトリフルオロメタンスルホネート、ビス(4−t−ブチルフェニル)ヨードニウムノナフルオロ−n−ブタンスルホネート、ビス(4−t−ブチルフェニル)ヨードニウムパーフルオロ−n−オクタンスルホネート、ビス(4−t−ブチルフェニル)ヨードニウム2−ビシクロ[2.2.1]ヘプタ−2−イル−1,1,2,2−テトラフルオロエタンスルホネート、シクロヘキシル・2−オキソシクロヘキシル・メチルスルホニウムトリフルオロメタンスルホネート、ジシクロヘキシル・2−オキソシクロヘキシルスルホニウムトリフルオロメタンスルホネート、2−オキソシクロヘキシルジメチルスルホニウムトリフルオロメタンスルホネート等を挙げることができる。
ハロゲン含有化合物としては、例えば、ハロアルキル基含有炭化水素化合物、ハロアルキル基含有複素環式化合物等を挙げることができる。ハロゲン含有化合物の具体例としては、フェニルビス(トリクロロメチル)−s−トリアジン、4−メトキシフェニルビス(トリクロロメチル)−s−トリアジン、1−ナフチルビス(トリクロロメチル)−s−トリアジン等の(トリクロロメチル)−s−トリアジン誘導体や、1,1−ビス(4−クロロフェニル)−2,2,2−トリクロロエタン等を挙げることができる。
ジアゾケトン化合物としては、例えば、1,3−ジケト−2−ジアゾ化合物、ジアゾベンゾキノン化合物、ジアゾナフトキノン化合物等を挙げることができる。ジアゾケトンの具体例としては、1,2−ナフトキノンジアジド−4−スルホニルクロリド、1,2−ナフトキノンジアジド−5−スルホニルクロリド、2,3,4,4’−テトラヒドロキシベンゾフェノンの1,2−ナフトキノンジアジド−4−スルホン酸エステル又は1,2−ナフトキノンジアジド−5−スルホン酸エステル、1,1,1−トリス(4−ヒドロキシフェニル)エタンの1,2−ナフトキノンジアジド−4−スルホン酸エステル又は1,2−ナフトキノンジアジド−5−スルホン酸エステル等を挙げることができる。
スルホン化合物としては、例えば、β−ケトスルホン、β−スルホニルスルホンや、これらの化合物のα−ジアゾ化合物等を挙げることができる。スルホン化合物の具体例としては、4−トリスフェナシルスルホン、メシチルフェナシルスルホン、ビス(フェニルスルホニル)メタン等を挙げることができる。
スルホン酸化合物として、例えば、アルキルスルホン酸エステル、アルキルスルホン酸イミド、ハロアルキルスルホン酸エステル、アリールスルホン酸エステル、イミノスルホネート等を挙げることができる。スルホン酸化合物の具体例としては、ベンゾイントシレート、ピロガロールのトリス(トリフルオロメタンスルホネート)、ニトロベンジル−9,10−ジエトキシアントラセン−2−スルホネート、トリフルオロメタンスルホニルビシクロ[2.2.1]ヘプト−5−エン−2,3−ジカルボジイミド、ノナフルオロ−n−ブタンスルホニルビシクロ[2.2.1]ヘプト−5−エン−2,3−ジカルボジイミド、パーフルオロ−n−オクタンスルホニルビシクロ[2.2.1]ヘプト−5−エン−2,3−ジカルボジイミド、2−ビシクロ[2.2.1]ヘプタ−2−イル−1,1,2,2−テトラフルオロエタンスルホニルビシクロ[2.2.1]ヘプト−5−エン−2,3−ジカルボジイミド、N−(トリフルオロメタンスルホニルオキシ)スクシンイミド、N−(ノナフルオロ−n−ブタンスルホニルオキシ)スクシンイミド、N−(パーフルオロ−n−オクタンスルホニルオキシ)スクシンイミド、N−(2−ビシクロ[2.2.1]ヘプタ−2−イル−1,1,2,2−テトラフルオロエタンスルホニルオキシ)スクシンイミド、1,8−ナフタレンジカルボン酸イミドトリフルオロメタンスルホネート、1,8−ナフタレンジカルボン酸イミドノナフルオロ−n−ブタンスルホネート、1,8−ナフタレンジカルボン酸イミドパーフルオロ−n−オクタンスルホネート等を挙げることができる。
本実施形態の感放射線性樹脂組成物は、樹脂(A)、酸発生剤(B)等が、溶剤(C)に分散したものである。溶剤(C)としては、例えば、2−ブタノン、2−ペンタノン、3−メチル−2−ブタノン、2−ヘキサノン、4−メチル−2−ペンタノン、3−メチル−2−ペンタノン、3,3−ジメチル−2−ブタノン、2−ヘプタノン、2−オクタノン等の直鎖状若しくは分岐状のケトン類;シクロペンタノン、3−メチルシクロペンタノン、シクロヘキサノン、2−メチルシクロヘキサノン、2,6−ジメチルシクロヘキサノン、イソホロン等の環状のケトン類;プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールモノエチルエーテルアセテート、プロピレングリコールモノ−n−プロピルエーテルアセテート、プロピレングリコールモノ−i−プロピルエーテルアセテート、プロピレングリコールモノ−n−ブチルエーテルアセテート、プロピレングリコールモノ−i−ブチルエーテルアセテート、プロピレングリコールモノ−sec−ブチルエーテルアセテート、プロピレングリコールモノ−t−ブチルエーテルアセテート等のプロピレングリコールモノアルキルエーテルアセテート類;2−ヒドロキシプロピオン酸メチル、2−ヒドロキシプロピオン酸エチル、2−ヒドロキシプロピオン酸n−プロピル、2−ヒドロキシプロピオン酸i−プロピル、2−ヒドロキシプロピオン酸n−ブチル、2−ヒドロキシプロピオン酸i−ブチル、2−ヒドロキシプロピオン酸sec−ブチル、2−ヒドロキシプロピオン酸t−ブチル等の2−ヒドロキシプロピオン酸アルキル類;3−メトキシプロピオン酸メチル、3−メトキシプロピオン酸エチル、3−エトキシプロピオン酸メチル、3−エトキシプロピオン酸エチル等の3−アルコキシプロピオン酸アルキル類のほか、
本発明の感放射線性樹脂組成物には、必要に応じて、酸拡散制御剤、酸解離性基を有する脂環族添加剤、界面活性剤、増感剤等の各種の添加剤を配合することができる。各添加剤の配合量は、その目的に応じて適宜決定することができる。
本発明で使用される酸拡散制御剤は、露光により酸発生剤から生じる酸のレジスト被膜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ものである。このような酸拡散制御剤を配合することにより、得られる感放射線性樹脂組成物の貯蔵安定性が向上し、またレジストとして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が得られる。
本実施形態の感放射線性樹脂組成物は、全固形分濃度(溶剤(C)を除いた成分の濃度)が、1〜50質量%、好ましくは1〜25質量%となるように、樹脂(A)、酸発生剤(B)等を、溶剤(C)に溶解したのち、例えば孔径0.2μm程度のフィルターでろ過することによって調製される。このときの、樹脂(A)、酸発生剤(B)等の配合量は、上術したそれぞれの成分の好ましい使用量とすることが好ましい。
本発明の感放射線性樹脂組成物用重合体の一実施形態は、上記一般式(1)で表される繰り返し単位(1)を含む感放射線性樹脂組成物用重合体である。本実施形態の感放射線性樹脂組成物用重合体は、このような繰り返し単位(1)を含むものであるため、感放射線性樹脂組成物に含有させ、その感放射線性樹脂組成物を塗膜してレジスト膜を形成したときに、レジスト膜の波長193nmの放射線の屈折率を1.72以上とすることが可能になる。特に、酸の作用によりアルカリ可溶性となる感放射線性樹脂組成物用重合体が、感放射線性樹脂組成物に含有させてレジスト膜を形成するのに好適である。酸の作用によりアルカリ可溶性となる感放射線性樹脂組成物用重合体としては、上述した、本発明の感放射線性樹脂組成物に含有される樹脂(A)が好ましい。本実施形態の感放射線性樹脂組成物用重合体は、上述した樹脂(A)と同様の条件を満たすことが好ましい。
本発明のレジストパターン形成方法は、まず、上記本発明の感放射線性樹脂組成物を基板に塗膜してレジスト膜を形成する。そして、放射線を、レンズと液浸露光用液体とを透過させて、レジスト膜に照射してレジストパターンを形成するものである。上記液浸露光用液体は、レンズとレジスト膜との間に、レジスト膜に接触した状態で介在させたものであり、波長193nmの放射線の屈折率が水より高い液体である。
東ソー社製GPCカラム(G2000HXL2本、G3000HXL1本、G4000HXL1本)を用い、流量1.0ミリリットル/分、溶出溶媒テトラヒドロフラン、カラム温度40℃の分析条件で、単分散ポリスチレンを標準とするゲルパーミエーションクロマトグラフィ(GPC)により測定した。また、分散度Mw/Mnは測定結果より算出した。
各重合体の13C−NMR分析は、日本電子社製「JNM−EX270」を用い、測定溶媒としてCDCL3を使用して実施した。
合成例(1−1):
100mlの三つ口フラスコに下記化合物(M−1)10.00g、2−ブタノン30gを入れ、更にジメチル2,2’−アゾビス(2−メチルプロピオネート)0.57gを投入して溶解させた。この三つ口フラスコを30分窒素パージした。窒素パージの後、反応釜を攪拌しながらあらかじめ80℃に加熱しておいたオイルバスにつけて加熱した。オイルバスにつけた時間を重合開始時間とし、重合反応を6時間実施した。重合終了後、重合溶液は水冷することにより30℃以下に冷却し、200gのメタノールへ投入し、析出した白色粉末をろ別した。ろ別された白色粉末を50℃にて15時間乾燥し、白色粉末の重合体を得た(7.07g、収率71%)。この重合体はMwが4,852、Mw/Mnが1.554の重合体であった。この重合体を樹脂(A−1)とする。また、この樹脂の構造は13C−NMR分析の結果から同定している。
13C−NMR(CDCl3,67.80MHz):(ppm)175.6−174.7(エステルケトン部根元,C),80.9−80.3(保護基6員環4位,C),52−50(主鎖,C),46.087(主鎖,CH2),36.869(保護基6員環3位と5位,CH2),24.111(保護基6員環2位と6位,CH2),22.602(保護基,CH3),18.307(主鎖,CH3)
樹脂(A−1)100質量部に対し、感放射線性酸発生剤(B)として、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を3.0質量部、酸拡散抑制剤としてN−t−ブトキシカルボニルピロリジンを0.21質量部、更に、溶剤(C)としてシクロヘキサノンを1510質量部添加し、各成分を混合して均一溶液とした。その後、孔径0.2μmのメンブランフィルターを用いて濾過することにより、感放射線性樹脂組成物(実施例1)からなる塗工液を調製した(総固形分濃度約6.4質量%)。
感放射線性樹脂組成物をシリコン基板上に、CLEAN TRACK ACT8(東京エレクトロン社製)にて、スピンコートし、80℃で60秒間PBを行うことにより、膜厚150nmのレジスト被膜を形成した。このレジスト被膜の屈折率を分光エリプソメーター(「VUV−VASE」、J.A.Woollam製)を用いて測定した。測定の結果、レジスト被膜の193nmにおける屈折率は、1.75であった。
感放射線性樹脂組成物をシリコン基板上に、CLEAN TRACK ACT8「東京エレクトロン製」にて、スピンコートし、100℃で60秒間PBを行うことにより、膜厚120nmのレジスト被膜を形成した。このレジスト被膜に、ArFエキシマレーザー露光装置(「NSR S306C」、Nikon製、照明条件;NA0.75シグマ0.85)により、パターンのついていないクオーツを通して35mJで露光した。露光後のレジスト被膜を削り取り、熱重量分析装置(熱分析装置本体「MTC100S型」マックサイエンス社製、示差熱天秤「TG−DTA2000S型」マックサイエンス社製)を用いて、露光後の感放射線性樹脂組成物(実施例1)の、加熱に対する温度上昇挙動と分解揮発による重量変化を測定した。その結果を図1に示す。図1において、「TG」は、重量の変化率(%)を示し、測定開始時の重量に対する変化した重量の比率を示す。マイナス(−)は、重量の減少を示す。
感放射線性樹脂組成物をシリコン基板上に、CLEAN TRACK ACT8「東京エレクトロン社製」にて、スピンコートし、100℃で60秒間PBを行うことにより、膜厚120nmのレジスト被膜を形成した。このレジスト被膜に、ArFエキシマレーザー露光装置(「NSR S306C」、Nikon社製、照明条件;NA0.75シグマ0.85)により、パターンのついていないクオーツを通して露光した。その後、120℃及び200℃で60秒間PEBを行ったのち、2.38質量%のテトラメチルアンモニウムヒドロキシド水溶液により、23℃で30秒間現像し、水洗し、乾燥して特性曲線測定用のウエハーを作成した。次いで、各露光量での膜厚を自動膜厚測定装置(「VM−2010」、大日本スクリーン社製)にて測定し、露光量と膜厚の相関を確認した。その結果を図2に示す。
Claims (4)
- レジスト膜を形成したときに、波長193nmの放射線の屈折率が1.72以上となる請求項1に記載の感放射線性樹脂組成物。
- 請求項1又は2に記載の感放射線性樹脂組成物を基板に塗膜してレジスト膜を形成し、
放射線を、レンズと、前記レンズと前記レジスト膜との間に前記レジスト膜に接触した状態で介在させた、波長193nmの放射線の屈折率が水より高い液浸露光用液体とを透過させて、前記レジスト膜に照射してレジストパターンを形成するレジストパターン形成方法。
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