JP2009251216A - ダブルパターン形成方法 - Google Patents
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Abstract
【効果】本発明によれば、簡易な工程で高精度なポジネガ反転を行うことができる。
【選択図】なし
Description
上述した通り、高い解像性が得られるポジ型レジスト膜より得たポジ像をネガパターンに反転する方法は種々報告されているが、いずれのポジネガ反転の手法も、工程が煩雑であって実用的ではない。パターン反転した膜を更に加工して微細なパターンを形成することはできないものばかりである。ここには、反転転写の例だけで、反転転写する膜にリソグラフィーを施すパターニングを加えたダブルパターニングの例示はない。
従って、本発明は、ポジ型レジスト膜をパターン化して得たポジ型パターンを容易に反転して微細なパターンを形成することができるダブルパターン形成方法を提供することを目的とする。
即ち本発明は、被加工基板上に、酸によって脱離する酸不安定基によって保護されたアルカリ可溶性基を持つ構造を有する繰り返し単位を有する樹脂を含有する化学増幅ポジ型レジスト膜形成用組成物を塗布し、プリベークにより不要な溶剤を除去してレジスト膜を形成する工程、該レジスト膜に高エネルギー線をパターン照射し、露光後加熱により露光によって発生した酸を酸不安定基に作用させ、露光部の樹脂の酸不安定基に脱離反応を行わせてアルカリ可溶とした後、アルカリ性現像液で現像して第1のポジ型パターンを得る工程、更に該ポジ型パターンを得る工程で得られた第1レジストパターン中の上記樹脂の酸不安定基を脱離させると共に、該樹脂にアルカリ性現像液に対する溶解性を失わない範囲で架橋を形成させて、レジストパターンに反転膜形成用組成物に使用される有機溶剤に対する耐性を与える工程、その後、反転膜形成用組成物として、アルカリ可溶性基を持つ構造を有する繰り返し単位を有する樹脂と酸架橋性剤を含有する第2の化学増幅ネガ型レジスト膜形成用組成物を塗布し、不要な溶剤をプリベークにより除去して第2レジスト膜を形成し、該第2レジスト膜に高エネルギー線をパターン照射し、露光後加熱により露光によって発生した酸を架橋性基に作用させ、露光部の樹脂をアルカリ現像液に不溶化後、アルカリ性現像液で現像して、第2のネガ型パターンを得る工程、そして更に第2のネガ型パターンを得るアルカリ現像液工程において、アルカリ性現像液に可溶に反転している上記第1のポジ型パターンを、第2のネガ型レジスト膜中スペースパターンとして溶解除去し、反転転写する工程を含む、上記第1のポジ型レジスト膜の反転転写パターンを得ると共に、第2のネガ型パターンを形成させることを特徴とするダブルパターン形成方法である(請求項1)。
これは、微細なライン&スペースを被加工基板上に2回のリソグラフィーでパターン形成し、その後1回のエッチングを行うことができる簡便なダブルパターニングを提供するものである。
このダブルパターニングも被加工基板上に2回のリソグラフィーでパターン形成し、その後1回のエッチングを行うことができる簡便なダブルパターニングを提供しているが、シングルパターニング(1回の露光だけでパターニングする)においては、微細なスペースパターンと、孤立ラインやピッチやライン&スペースの比率(Duty Ratio)の異なったパターンのプロセスマージンの向上は、トレードオフ関係にあって至難とされるところを、本発明のダブルパターニングによって、どちらのプロセスマージンも改善、向上させることが可能となる。即ち、反転した第1レジストパターンによって、微細なスペースを解像せしめ、混在する孤立ラインやピッチやライン&スペースの比率(Duty Ratio)の異なったパターンを第2のネガ型レジストパターンによって形成させることができるので、それぞれのプロセスマージンを向上させる利点があるといえる。
これは、被加工基板に対するエッチング選択比の改善に有用である。
まず、一点は、第1レジスト膜の膜厚と第2レジスト膜の膜厚であった。アルカリ可溶へと反転した第1レジストパターンをアルカリ現像で第2レジスト膜から除去するためには、第1レジストパターンの頭は第2レジスト膜の上表面より露出していなければ、第1レジストパターンは現像液に触れないので除去できないと考えられる。従って、第1レジスト膜のパターンを高くして、第2レジスト膜の膜厚を薄くすることの検討が必要とされた。しかしながら、第2レジストパターンの高さ(アスペクト比=ラインパターンの高さ/ラインパターンサイズ)が低くなることや工程管理のため第1レジストパターンを第2レジスト膜で覆ってしまうことが良しとされた。第2レジスト膜で第1レジストパターンを覆ってしまう効果は、第1レジストパターン間へ隙間なく第2レジスト膜を埋め込むことに有用と考えられる。第2レジスト膜で第1レジストパターンを覆ってしまうと反転した第1レジストパターンをアルカリ現像除去できなくなってしまう。
そこで、第2レジスト膜に若干のアルカリ現像液に対する溶解性を持たせ、アルカリ現像液で若干の膜減りを与えることで、第1レジストパターンのアルカリ可溶部と現像液が通じ、接する方策が案出された。
本態様に係るパターン形成方法に用いられる第1のポジ型レジスト材料のベース樹脂に使用される高分子化合物としては、ラクトン環を有する繰り返し単位を、特には7−オキサノルボルナン環を有する繰り返し単位、好ましくは下記一般式(1)に示される繰り返し単位(a)を有するものが有利に使用できる。この単位は密着性単位として使用されるものであり、ベース樹脂に更に追加の構成を加えなくても本発明の方法が好ましく適用可能である。
R55、R56、R57はそれぞれ炭素数1〜20の直鎖状、分岐状又は環状のアルキル基等の一価炭化水素基であり、酸素、硫黄、窒素、フッ素等のヘテロ原子を含んでもよい。あるいはR55とR56、R55とR57、R56とR57はそれぞれ結合してこれらが結合する炭素原子と共に炭素数3〜20、特に4〜16の環、特に脂環を形成してもよい。
繰り返し単位(d)を得るためのモノマーとしては、具体的に下記に挙げることができる。
カルボキシル基を有する繰り返し単位としては下記に挙げることができる。
なお、高分子化合物をこのような溶解速度とするためには、一般式(b)で示される酸不安定基を有する繰り返し単位が全繰り返し単位中、10モル%以上90モル%以下、特に12モル%以上80モル%以下であることが好ましい。
i.下記一般式(P1a−1),(P1a−2),(P1a−3)又は(P1b)のオニウム塩、
ii.下記一般式(P2)のジアゾメタン誘導体、
iii.下記一般式(P3)のグリオキシム誘導体、
iv.下記一般式(P4)のビススルホン誘導体、
v.下記一般式(P5)のN−ヒドロキシイミド化合物のスルホン酸エステル、
vi.β−ケトスルホン酸誘導体、
vii.ジスルホン誘導体、
viii.ニトロベンジルスルホネート誘導体、
ix.スルホン酸エステル誘導体
等が挙げられる。
オニウム塩としては、例えばトリフルオロメタンスルホン酸ジフェニルヨードニウム、トリフルオロメタンスルホン酸(p−tert−ブトキシフェニル)フェニルヨードニウム、p−トルエンスルホン酸ジフェニルヨードニウム、p−トルエンスルホン酸(p−tert−ブトキシフェニル)フェニルヨードニウム、トリフルオロメタンスルホン酸トリフェニルスルホニウム、トリフルオロメタンスルホン酸(p−tert−ブトキシフェニル)ジフェニルスルホニウム、トリフルオロメタンスルホン酸ビス(p−tert−ブトキシフェニル)フェニルスルホニウム、トリフルオロメタンスルホン酸トリス(p−tert−ブトキシフェニル)スルホニウム、p−トルエンスルホン酸トリフェニルスルホニウム、p−トルエンスルホン酸(p−tert−ブトキシフェニル)ジフェニルスルホニウム、p−トルエンスルホン酸ビス(p−tert−ブトキシフェニル)フェニルスルホニウム、p−トルエンスルホン酸トリス(p−tert−ブトキシフェニル)スルホニウム、ノナフルオロブタンスルホン酸トリフェニルスルホニウム、ブタンスルホン酸トリフェニルスルホニウム、トリフルオロメタンスルホン酸トリメチルスルホニウム、p−トルエンスルホン酸トリメチルスルホニウム、トリフルオロメタンスルホン酸シクロヘキシルメチル(2−オキソシクロヘキシル)スルホニウム、p−トルエンスルホン酸シクロヘキシルメチル(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ン酸ジメチルフェニルスルホニウム、p−トルエンスルホン酸ジメチルフェニルスルホニウム、トリフルオロメタンスルホン酸ジシクロヘキシルフェニルスルホニウム、p−トルエンスルホン酸ジシクロヘキシルフェニルスルホニウム、トリフルオロメタンスルホン酸トリナフチルスルホニウム、トリフルオロメタンスルホン酸(2−ノルボニル)メチル(2−オキソシクロヘキシル)スルホニウム、エチレンビス[メチル(2−オキソシクロペンチル)スルホニウムトリフルオロメタンスルホナート]、1,2’−ナフチルカルボニルメチルテトラヒドロチオフェニウムトリフレート等のオニウム塩を挙げることができる。
更に、国際公開第2004/074242号パンフレットで示されるオキシムタイプの酸発生剤を添加することもできる。
この場合、かかるフェノール性水酸基を2つ以上有する化合物又はカルボキシ基を有する化合物として下記式(D1)〜(D14)で示されるものが好ましい。
塩基性化合物としては、酸発生剤より発生する酸がレジスト膜中に拡散する際の拡散速度を抑制することができる化合物が適している。塩基性化合物の配合により、レジスト膜中での酸の拡散速度が抑制されて解像度が向上し、露光後の感度変化を抑制したり、基板や環境依存性を少なくし、露光余裕度やパターンプロファイル等を向上することができる。
イミド誘導体としては、フタルイミド、サクシンイミド、マレイミド等が例示される。
N(X)n(Y)3-n (B)−1
(上記式中、n=1、2又は3である。側鎖Xは同一でも異なっていてもよく、下記一般式(X)−1〜(X)−3で表すことができる。側鎖Yは同一又は異種の水素原子もしくは直鎖状、分岐状又は環状の炭素数1〜20のアルキル基を示し、エーテル基もしくはヒドロキシル基を含んでもよい。また、X同士が結合してこれらが結合する窒素原子と共に環を形成してもよい。)
R303は単結合、又は炭素数1〜4の直鎖状又は分岐状のアルキレン基であり、R306は炭素数1〜20の直鎖状、分岐状又は環状のアルキル基であり、ヒドロキシ基、エーテル基、エステル基、ラクトン環を1個あるいは複数個含んでいてもよい。
トリス(2−メトキシメトキシエチル)アミン、トリス{2−(2−メトキシエトキシ)エチル}アミン、トリス{2−(2−メトキシエトキシメトキシ)エチル}アミン、トリス{2−(1−メトキシエトキシ)エチル}アミン、トリス{2−(1−エトキシエトキシ)エチル}アミン、トリス{2−(1−エトキシプロポキシ)エチル}アミン、トリス[2−{2−(2−ヒドロキシエトキシ)エトキシ}エチル]アミン、4,7,13,16,21,24−ヘキサオキサ−1,10−ジアザビシクロ[8.8.8]ヘキサコサン、4,7,13,18−テトラオキサ−1,10−ジアザビシクロ[8.5.5]エイコサン、1,4,10,13−テトラオキサ−7,16−ジアザビシクロオクタデカン、1−アザ−12−クラウン−4、1−アザ−15−クラウン−5、1−アザ−18−クラウン−6、トリス(2−フォルミルオキシエチル)アミン、トリス(2−アセトキシエチル)アミン、トリス(2−プロピオニルオキシエチル)アミン、トリス(2−ブチリルオキシエチル)アミン、トリス(2−イソブチリルオキシエチル)アミン、トリス(2−バレリルオキシエチル)アミン、トリス(2−ピバロイルオキシエチル)アミン、N,N−ビス(2−アセトキシエチル)2−(アセトキシアセトキシ)エチルアミン、トリス(2−メトキシカルボニルオキシエチル)アミン、トリス(2−tert−ブトキシカルボニルオキシエチル)アミン、トリス[2−(2−オキソプロポキシ)エチル]アミン、トリス[2−(メトキシカルボニルメチル)オキシエチル]アミン、トリス[2−(tert−ブトキシカルボニルメチルオキシ)エチル]アミン、トリス[2−(シクロヘキシルオキシカルボニルメチルオキシ)エチル]アミン、トリス(2−メトキシカルボニルエチル)アミン、トリス(2−エトキシカルボニルエチル)アミン、N,N−ビス(2−ヒドロキシエチル)2−(メトキシカルボニル)エチルアミン、N,N−ビス(2−アセトキシエチル)2−(メトキシカルボニル)エチルアミン、N,N−ビス(2−ヒドロキシエチル)2−(エトキシカルボニル)エチルアミン、N,N−ビス(2−アセトキシエチル)2−(エトキシカルボニル)エチルアミン、N,N−ビス(2−ヒドロキシエチル)2−(2−メトキシエトキシカルボニル)エチルアミン、N,N−ビス(2−アセトキシエチル)2−(2−メトキシエトキシカルボニル)エチルアミン、N,N−ビス(2−ヒドロキシエチル)2−(2−ヒドロキシエトキシカルボニル)エチルアミン、N,N−ビス(2−アセトキシエチル)2−(2−アセトキシエトキシカルボニル)エチルアミン、N,N−ビス(2−ヒドロキシエチル)2−[(メトキシカルボニル)メトキシカルボニル]エチルアミン、N,N−ビス(2−アセトキシエチル)2−[(メトキシカルボニル)メトキシカルボニル]エチルアミン、N,N−ビス(2−ヒドロキシエチル)2−(2−オキソプロポキシカルボニル)エチルアミン、N,N−ビス(2−アセトキシエチル)2−(2−オキソプロポキシカルボニル)エチルアミン、N,N−ビス(2−ヒドロキシエチル)2−(テトラヒドロフルフリルオキシカルボニル)エチルアミン、N,N−ビス(2−アセトキシエチル)2−(テトラヒドロフルフリルオキシカルボニル)エチルアミン、N,N−ビス(2−ヒドロキシエチル)2−[(2−オキソテトラヒドロフラン−3−イル)オキシカルボニル]エチルアミン、N,N−ビス(2−アセトキシエチル)2−[(2−オキソテトラヒドロフラン−3−イル)オキシカルボニル]エチルアミン、N,N−ビス(2−ヒドロキシエチル)2−(4−ヒドロキシブトキシカルボニル)エチルアミン、N,N−ビス(2−ホルミルオキシエチル)2−(4−ホルミルオキシブトキシカルボニル)エチルアミン、N,N−ビス(2−ホルミルオキシエチル)2−(2−ホルミルオキシエトキシカルボニル)エチルアミン、N,N−ビス(2−メトキシエチル)2−(メトキシカルボニル)エチルアミン、N−(2−ヒドロキシエチル)ビス[2−(メトキシカルボニル)エチル]アミン、N−(2−アセトキシエチル)ビス[2−(メトキシカルボニル)エチル]アミン、N−(2−ヒドロキシエチル)ビス[2−(エトキシカルボニル)エチル]アミン、N−(2−アセトキシエチル)ビス[2−(エトキシカルボニル)エチル]アミン、N−(3−ヒドロキシ−1−プロピル)ビス[2−(メトキシカルボニル)エチル]アミン、N−(3−アセトキシ−1−プロピル)ビス[2−(メトキシカルボニル)エチル]アミン、N−(2−メトキシエチル)ビス[2−(メトキシカルボニル)エチル]アミン、N−ブチルビス[2−(メトキシカルボニル)エチル]アミン、N−ブチルビス[2−(2−メトキシエトキシカルボニル)エチル]アミン、N−メチルビス(2−アセトキシエチル)アミン、N−エチルビス(2−アセトキシエチル)アミン、N−メチルビス(2−ピバロイルオキシエチル)アミン、N−エチルビス[2−(メトキシカルボニルオキシ)エチル]アミン、N−エチルビス[2−(tert−ブトキシカルボニルオキシ)エチル]アミン、トリス(メトキシカルボニルメチル)アミン、トリス(エトキシカルボニルメチル)アミン、N−ブチルビス(メトキシカルボニルメチル)アミン、N−ヘキシルビス(メトキシカルボニルメチル)アミン、β−(ジエチルアミノ)−δ−バレロラクトンを例示できるが、これらに制限されない。
下記一般式(A1)〜(A10)で示される化合物のフェノール性水酸基の水素原子の一部又は全部を−R401−COOH(R401は炭素数1〜10の直鎖状又は分岐状のアルキレン基)により置換してなり、かつ分子中のフェノール性水酸基(C)と≡C−COOHで示される基(D)とのモル比率がC/(C+D)=0.1〜1.0である化合物。
下記一般式(A11)〜(A15)で示される化合物。
相応しい第2のネガ型レジストの例として、公知のものを用いることができる(公知文献1〜17)。
公知文献1;国際公開2204−074936公報
公知文献2;特開2006−215067公報
公知文献3;特開2006−301289公報
公知文献4;特開2006−317803公報
公知文献5;特開2006−350198公報
公知文献6;特開2004−4794公報
公知文献7;特開2004−252146公報
公知文献8;特開2004−294638公報
公知文献9;特開2004−318080公報
公知文献10;特開2004−341432公報
公知文献11;特開2005−3862公報
公知文献12;特開2005−3863公報
公知文献13;特開2005−336452公報
公知文献14;特開2006−145788公報
公知文献15;特開2006−160−3066公報
公知文献16;特開2006−195050公報
公知文献17;特開2006−145775公報
ひとつは、反転した第1レジストパターンの間の位置に第2レジストパターンのスペースが形成できるように露光するものである(図1(E−1))。この場合、アルカリ可溶に反転した第1レジストパターンはスペースとしてアルカリ現像液から除去され、更に第2レジストパターンはその間にスペースを形成することから、結果、緻密なライン&スペースを形成するダブルパターニングを可能とする(図1(E−2))。本発明に係る第2レジスト膜は、ネガ型レジスト膜であることから、図1(E−1)のように露光部(50)は反転転写された第1レジストパターン上に施され、露光部(50)において第2のネガ型レジスト膜の架橋反応が進行、アルカリ現像液に不溶となることから、反転転写される第1レジストパターンの間に第2レジストのスペースパターンが形成される。
このダブルパターニングによる緻密ライン&スペースパターンは、シングルパターニングではなし得ないパターンサイズのライン&スペースを形成できる利点がある。
反転する第1レジスト材料に用いる高分子化合物、並びに第1レジストパターンが反転転写されかつ第2レジスト材料に用いる高分子化合物として、各々のモノマーを組み合わせてテトラヒドロフラン溶媒下で共重合反応を行い、メタノールに晶出し、更にヘキサンで洗浄を繰り返した後に単離、乾燥して、以下に示す組成の高分子化合物(ポリマー1〜9、比較ポリマー10〜11)を得た。モノマーのフェノール基はアセトキシ基で置換し、重合後のアルカリ加水分解によってフェノール基にした。得られた高分子化合物の組成は1H−NMR、分子量及び分散度はゲルパーミエーションクロマトグラフにより確認した。
攪拌機、還流器、滴下ロート、温度計を備えた200mlの四口フラスコに酢酸0.2g、水20g、エタノール20gを仕込んで30℃に保ち、ここへトリエトキシシラン化合物(A)9.1g(30mmol)、トリエトキシシラン化合物(B)31.8g(70mmol)をエタノール40gに溶解させた溶液を3時間かけて滴下した。
これをトルエン50gを用いて攪拌機、還流器、温度計を備えた100mlの三口フラスコに洗い込み、ここに水酸化カリウム56mgを加えて20時間、加熱還流した。冷却後反応液をメチルイソブチルケトンで希釈し、有機層が中性となるまで水洗を繰り返した後に濃縮してポリマー23.8gを得た。
NMRとGPC分析の結果、このものは下記式で示される重量平均分子量3,500のレジストポリマー14であることが確認された。
次に上述した高分子化合物を用いて、光酸発生剤、塩基性化合物、界面活性剤、熱酸発生剤、有機溶剤、更には第2レジスト材料の場合、酸架橋剤を添加した各レジスト組成物を用いた配合例を示す。
有機溶剤:2−Me−1−Butanol(2−メチル−1−ブタノール)
第1レジスト材料のパターニングの実施例を示す。また、第1レジスト材料のパターニング比較例を示す(表2)。
上記表1に示す組成で調製したレジスト材料を孔径0.2μmのフィルターを用いてろ過し、ポジ型レジスト膜形成用塗布液を調製した。
シリコンウエハーにARC−29A(日産化学工業(株)製)を90nmの膜厚で成膜した基板上にスピンコーティングし、ホットプレートを用いて各レジストに適正な温度で60秒間プリベークし、レジスト膜の厚みを1,200Åとした。適正なベーク温度とは、パターニング後、評価するパターンプロファイルをTop Down SEM(上空走査電子線顕微鏡)S9320 (株)日立製作所製)を用いて観察した際に矩形性が高く、ブリッジ等が発生せず、パターンエッジが欠けることのない、良好なプロファイルを得る温度を指す。適正なプリベーク温度を表2に示した。
更に、マスク上ライン&スペースのデザインはライン90nm、ピッチ160nm(スペース70nmであるので)、高露光量で40nmの第2レジストスペースパターンを解像せしめ、反転転写した第1レジストのスペースパターンサイズも40nmを狙ったことから、ライン(&スペース)40nm、ピッチ80nmの繰り返しパターンが形成するダブルパターニングに成功した。その結果を表4にまとめた。表4には第2レジスト膜を40nmに解像した露光量とダブルパターニング後のプロファイルをまとめた。
20 被加工基板
30 第1レジスト膜
30a 第1レジストパターン
30b 架橋レジストパターン
40 反転転写用第2レジスト膜
50 露光部
Claims (14)
- 被加工基板上に、酸によって脱離する酸不安定基によって保護されたアルカリ可溶性基を持つ構造を有する繰り返し単位を有する樹脂を含有する化学増幅ポジ型レジスト膜形成用組成物を塗布し、プリベークにより不要な溶剤を除去してレジスト膜を形成する工程、該レジスト膜に高エネルギー線をパターン照射し、露光後加熱により露光によって発生した酸を酸不安定基に作用させ、露光部の樹脂の酸不安定基に脱離反応を行わせてアルカリ可溶とした後、アルカリ性現像液で現像して第1のポジ型パターンを得る工程、更に該ポジ型パターンを得る工程で得られた第1レジストパターン中の上記樹脂の酸不安定基を脱離させると共に、該樹脂にアルカリ性現像液に対する溶解性を失わない範囲で架橋を形成させて、レジストパターンに反転膜形成用組成物に使用される有機溶剤に対する耐性を与える工程、その後、反転膜形成用組成物として、アルカリ可溶性基を持つ構造を有する繰り返し単位を有する樹脂と酸架橋性剤を含有する第2の化学増幅ネガ型レジスト膜形成用組成物を塗布し、不要な溶剤をプリベークにより除去して第2レジスト膜を形成し、該第2レジスト膜に高エネルギー線をパターン照射し、露光後加熱により露光によって発生した酸を架橋性基に作用させ、露光部の樹脂をアルカリ現像液に不溶化後、アルカリ性現像液で現像して、第2のネガ型パターンを得る工程、そして更に第2のネガ型パターンを得るアルカリ現像液工程において、アルカリ性現像液に可溶に反転している上記第1のポジ型パターンを、第2のネガ型レジスト膜中スペースパターンとして溶解除去し、反転転写する工程を含む、上記第1のポジ型レジスト膜の反転転写パターンを得ると共に、第2のネガ型パターンを形成させることを特徴とするダブルパターン形成方法。
- 上記第2のネガ型レジスト膜のパターン形成露光において、第1のポジ型パターンの上に露光し、アルカリ現像除去できるスペースを、第1のポジ型レジスト膜の反転転写したスペースパターンの間に形成することで、ラインとスペースの繰り返しパターンを被加工基板上に形成させる請求項1記載のダブルパターン形成方法。
- 上記第2のネガ型レジスト膜のパターン形成露光において、第1のポジ型パターンより離れたところへ露光することで、第1の反転転写したパターンとは別に第2のネガ型レジストパターンを被加工基板上に形成させる請求項1記載のダブルパターン形成方法。
- 上記第1の化学増幅ポジ型レジスト膜形成用組成物が、ラクトン環を有する繰り返し単位(A)と、酸によって脱離する酸不安定基で保護されたアルカリ可溶性基を持つ脂環構造を有する繰り返し単位(B)とを有する樹脂を含有するポジ型レジスト材料である請求項1乃至3のいずれか1項記載のダブルパターン形成方法。
- 上記第1の化学増幅ポジ型レジスト膜形成用組成物が、7−オキサノルボルナン環を有する繰り返し単位(A)と、酸によって脱離する脂環構造の酸不安定基で保護されたアルカリ可溶性基を持つ繰り返し単位(B)とを有する樹脂であって、得られたパターンに熱を加えて、パターン中の高分子化合物の酸不安定基を脱離させる際、該パターン中の高分子化合物の架橋と酸不安定基の脱離とを同時に行うことのできる樹脂を含有するポジ型レジスト材料である請求項4記載のダブルパターン形成方法。
- 上記第1レジストパターンの反転膜形成用の組成物でかつ第2の化学増幅ネガ型レジスト膜形成用組成物が、アルカリ可溶性基がフッ素化されたヒドロキシアルキル基である構造を有する繰り返し単位を有する樹脂を含有するネガ型レジスト材料である請求項1乃至7のいずれか1項記載のダブルパターン形成方法。
- 上記第1レジストパターンの反転膜形成用の組成物でかつ第2の化学増幅ネガ型レジスト膜形成用組成物において、フッ素化されたヒドロキシアルキル基である構造を有する繰り返し単位が、下記一般式(U),(V)のいずれかで示される繰り返し単位である請求項8記載のダブルパターン形成方法。
- 上記第1レジストパターンの反転膜形成用の組成物でかつ第2の化学増幅ネガ型レジスト膜形成用組成物において、アルカリ可溶性基がフッ素化されたヒドロキシアルキル基である構造を有する繰り返し単位を有する樹脂が、ポリシロキサン化合物である請求項1乃至7のいずれか1項記載のダブルパターン形成方法。
- ポリシロキサン化合物が、下記一般式(2)及び(3)で表される構造単位を有するポリシロキサン化合物の繰り返し単位である請求項11記載のダブルパターン形成方法。
- 上記第1レジストパターンに反転用膜形成用組成物に使用される有機溶剤に対する耐性を与える工程は、プリベーク及び露光後加熱の何れよりも高い温度での処理を伴う請求項1乃至12のいずれか1項記載のダブルパターン形成方法。
- 被加工基板上に、酸によって脱離する酸不安定基によって保護されたアルカリ可溶性基を持つ構造を有する繰り返し単位を有する樹脂を含有する化学増幅ポジ型レジスト膜形成用組成物を塗布し、プリベークにより不要な溶剤を除去してレジスト膜を形成する工程、レジスト膜上に保護膜形成用組成物を塗布し加熱により不要な溶剤を除去して保護膜を形成する工程、該レジスト膜に高エネルギー線をパターン照射し、露光後加熱により露光によって発生した酸を酸不安定基に作用させ、露光部の樹脂の酸不安定基に脱離反応を行わせた後、アルカリ性現像液で現像して第1のポジ型パターンを得る工程、更に該ポジ型パターンを得る工程で得られた第1レジストパターン中の上記樹脂の酸不安定基を脱離させると共に、該樹脂にアルカリ性現像液に対する溶解性を失わない範囲で架橋を形成させて、レジストパターンに反転膜形成用組成物に使用される有機溶剤に対する耐性を与える工程、その後、反転膜形成用組成物として、アルカリ可溶性基を持つ構造を有する繰り返し単位を有する樹脂と酸架橋性剤を含有する第2の化学増幅ネガ型レジスト膜形成用組成物を塗布し、不要な溶剤をプリベークにより除去して第2レジスト膜を形成し、更にレジスト膜上に保護膜形成用組成物を塗布し、加熱により不要な溶剤を除去して保護膜を形成する工程、該第2レジスト膜に高エネルギー線をパターン照射し、露光後加熱により露光によって発生した酸を架橋性基に作用させ、露光部の樹脂をアルカリ現像液に不溶化後、アルカリ性現像液で現像して、第2のネガ型パターンを得る工程、そして更に第2のネガ型パターンを得るアルカリ現像液工程において、アルカリ性現像液に可溶に反転している上記第1のポジ型パターンを第2のネガ型レジスト膜中スペースパターンとして溶解除去し、反転転写する工程を含む、上記第1のポジ型レジスト膜の反転転写パターンを得ると共に、第2のネガ型パターンを形成させることを特徴とするダブルパターン形成方法。
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Also Published As
Publication number | Publication date |
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TWI409584B (zh) | 2013-09-21 |
JP5007827B2 (ja) | 2012-08-22 |
KR20090106353A (ko) | 2009-10-08 |
US8129100B2 (en) | 2012-03-06 |
KR101312153B1 (ko) | 2013-09-26 |
TW201005429A (en) | 2010-02-01 |
US20090253084A1 (en) | 2009-10-08 |
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