JP5741210B2 - ドライ露光用フォトレジスト組成物及びレジストパターン形成方法 - Google Patents
ドライ露光用フォトレジスト組成物及びレジストパターン形成方法 Download PDFInfo
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- JP5741210B2 JP5741210B2 JP2011114227A JP2011114227A JP5741210B2 JP 5741210 B2 JP5741210 B2 JP 5741210B2 JP 2011114227 A JP2011114227 A JP 2011114227A JP 2011114227 A JP2011114227 A JP 2011114227A JP 5741210 B2 JP5741210 B2 JP 5741210B2
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- CATSNJVOTSVZJV-UHFFFAOYSA-N heptan-2-one Chemical compound CCCCCC(C)=O CATSNJVOTSVZJV-UHFFFAOYSA-N 0.000 description 4
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- 238000005259 measurement Methods 0.000 description 4
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 4
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- 239000002245 particle Substances 0.000 description 4
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- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 description 4
- VLLPVDKADBYKLM-UHFFFAOYSA-M 1,1,2,2,3,3,4,4,4-nonafluorobutane-1-sulfonate;triphenylsulfanium Chemical compound [O-]S(=O)(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F.C1=CC=CC=C1[S+](C=1C=CC=CC=1)C1=CC=CC=C1 VLLPVDKADBYKLM-UHFFFAOYSA-M 0.000 description 3
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- 238000001644 13C nuclear magnetic resonance spectroscopy Methods 0.000 description 3
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- 238000000638 solvent extraction Methods 0.000 description 1
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- 238000003756 stirring Methods 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
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- CROWJIMGVQLMPG-UHFFFAOYSA-N tert-butyl benzimidazole-1-carboxylate Chemical compound C1=CC=C2N(C(=O)OC(C)(C)C)C=NC2=C1 CROWJIMGVQLMPG-UHFFFAOYSA-N 0.000 description 1
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- Materials For Photolithography (AREA)
Description
[A]酸解離性基を有する重合体(以下、「[A]重合体」ともいう。)、
[B]酸発生体、及び
[C]界面活性剤
を含有し、
[A]重合体100質量部に対する[C]界面活性剤の含有量が、1質量部以上5質量部以下であるドライ露光用フォトレジスト組成物である。
(1)当該ドライ露光用フォトレジスト組成物を基板上に塗布し、レジスト膜を形成する工程、
(2)上記レジスト膜を気体を介して露光する工程、
(3)露光された上記レジスト膜を加熱する工程、及び
(4)加熱された上記レジスト膜を現像する工程
を有する。
本発明のドライ露光用フォトレジスト組成物は、[A]重合体、[B]酸発生体及び[C]界面活性剤を含有し、[A]重合体100質量部に対する[C]界面活性剤の含有量が、1質量部以下5質量部以下である。当該ドライ露光用フォトレジスト組成物は、さらに好適成分として[D]酸拡散制御体を含有してもよく、本発明の効果を損なわない範囲においてその他の任意成分を含有していてもよい。以下、各成分について詳述する。
[A]重合体は、酸解離性基を有する重合体である。ここで、「酸解離性基」とは、カルボキシル基、ヒドロキシル基等の水素原子を置換する基であって、露光により[B]酸発生体から発生する酸等の作用により解離する基を意味する。当該ドライ露光用フォトレジスト組成物は、[A]重合体が酸解離性基を有することで、露光部における酸解離性基が解離して極性が増大し、現像液に対する溶解性が変化してパターン形成性を発揮することができる。[A]重合体は酸解離性基を有する限り特に限定されない。酸解離性基の位置としては特に限定されず、主鎖や末端に結合していてもよいが、[A]重合体が酸解離性基を含む構造単位(以下、「構造単位(I)」ともいう。)を有することが好ましい。
構造単位(I)は、酸解離性基を含む構造単位である。当該ドライ露光用フォトレジスト組成物によれば、[A]重合体が構造単位(I)を有することで酸解離性基を[A]重合体中に効果的に組み込むことができ、良好なパターンを形成することができる。
ノルボルナン骨格、アダマンタン骨格、トリシクロデカン骨格、テトラシクロドデカン等の有橋式骨格を有する多環の脂環式基;
シクロペンタン、シクロヘキサン等のシクロアルカン骨格を有する単環の脂環式基、及びこれらの単環又は多環の脂環式基を有する炭化水素基が挙げられる。また、これらの基は、例えば炭素数1〜10の直鎖状、分岐状又は環状のアルキル基の1種以上で置換されていてもよい。
ノルボルナン骨格、アダマンタン骨格、トリシクロデカン骨格、テトラシクロドデカン等の有橋式骨格を有する多環の脂環式炭化水素;
シクロペンタン、シクロヘキサン等のシクロアルカン骨格を有する単環の脂環式炭化水素が有する同一の炭素原子に結合する2個の水素原子を除いた基等が挙げられる。
構造単位(II)は、ラクトン基及び環状カーボネート基からなる群より選ばれる少なくとも1種を有する構造単位である。[A]重合体が、ラクトン基及び/又は環状カーボネート基を含む構造単位をさらに有することで、レジスト膜と基板との密着性等、レジスト基本特性をより向上させることができる。また、レジスト膜の現像液への可溶性を高めることができる。ここで、ラクトン基とは、−O−C(O)−で表される結合を含むひとつの環(ラクトン環)を含有する環式基を示す。また、環状カーボネート基とは、−O−C(O)−O−で表される結合を含むひとつの環(環状カーボネート環)を含有する環式基を示す。ラクトン環又は環状カーボネート環を1つめの環として数え、ラクトン環又は環状カーボネート環のみの場合は単環式基、さらに他の環構造を有する場合は、その構造に関わらず多環式基と称する。
上記式(L3−3)中、RLc2は水素原子又は炭素数1〜4のアルキル基である。
上記式(L3−1)及び(L3−2)中、nLc1は0又は1である。
上記式(L3−3)中、nLc2は0〜3の整数である。
上記式(L3−7)中、nc1は0〜2の整数である。
上記式(L3−8)中、nC2〜nC5は、それぞれ独立して、0〜2の整数である。
*は、上記式(L−1)中のRL2に結合する結合部位を示す。なお、式(L3−1)〜(L3−8)で表される基は置換基を有していてもよい。
[A]重合体は、ヒドロキシル基を有する構造単位(III)を有していてもよい。当該ドライ露光用フォトレジスト組成物は、[A]重合体が構造単位(III)を有することで、レジストパターン形成性を向上させることができる。また、レジスト膜と基板との密着性を向上させることができる。
[A]重合体は、上記構造単位(I)〜(III)以外にも、例えば、ヒドロキシル基以外のシアノ基、ケトン性カルボニル基等の極性基を有する構造単位等その他の構造単位をさらに有していてもよい。その他の構造単位の合計含有割合としては、[A]重合体を構成する全構造単位に対して、通常30モル%以下であり、好ましくは20モル%以下である。
[A]重合体は、例えば各構造単位を与える単量体を、ラジカル重合開始剤を使用し、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。
n−ペンタン、n−ヘキサン、n−ヘプタン、n−オクタン、n−ノナン、n−デカン等のアルカン類;
シクロヘキサン、シクロヘプタン、シクロオクタン、デカリン、ノルボルナン等のシクロアルカン類;
ベンゼン、トルエン、キシレン、エチルベンゼン、クメン等の芳香族炭化水素類;
クロロブタン類、ブロモヘキサン類、ジクロロエタン類、ヘキサメチレンジブロミド、クロロベンゼン等のハロゲン化炭化水素類;
酢酸エチル、酢酸n−ブチル、酢酸i−ブチル、プロピオン酸メチル等の飽和カルボン酸エステル類;
アセトン、メチルエチルケトン、4−メチル−2−ペンタノン、2−ヘプタノン等のケトン類;
テトラヒドロフラン、ジメトキシエタン類、ジエトキシエタン類等のエーテル類;
メタノール、エタノール、1−プロパノール、2−プロパノール、4−メチル−2−ペンタノール等のアルコール類等が挙げられる。これらの溶媒は、単独で使用してもよく2種以上を併用してもよい。
[B]酸発生体は、電磁波や荷電粒子線の露光により酸を発生する物質である。上記発生した酸が[A]重合体中に存在する酸解離性基を解離させることにより、カルボキシル基等の極性基を生成させ、その結果、[A]重合体は現像液に対する溶解性が変化する。ここで、上記電磁波としては、紫外線、可視光線、遠紫外線、X線、γ線等が挙げられ、上記荷電粒子線としては、電子線、α線等が挙げられる。当該ドライ露光用フォトレジスト組成物における[B]酸発生体の含有形態としては、後述するような化合物の形態(以下、適宜「[B]酸発生剤」とも称する。)でも、重合体の一部として組み込まれた酸発生基の形態でも、これらの両方の形態でもよい。
当該ドライ露光用フォトレジスト組成物は、上記特定範囲の含有量の[C]界面活性剤を含有する。[C]界面活性剤としては特に限定されないが、現像欠陥抑制性の向上の観点から、フッ素原子又はケイ素原子を有するノニオン系界面活性剤が好ましいものとして挙げられる。[C]界面活性剤は1種又は2種以上を用いることができる。
[D]酸拡散制御体は、露光により[B]酸発生体から生じる酸等のレジスト膜中における拡散現象を制御し、未露光領域における好ましくない化学反応を抑制する効果を奏し、得られるドライ露光用フォトレジスト組成物の貯蔵安定性がさらに向上し、またレジストとしての解像度がさらに向上すると共に、露光から現像処理までの引き置き時間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、プロセス安定性に優れるドライ露光用フォトレジスト組成物が得られる。[D]酸拡散制御体の当該ドライ露光用フォトレジスト組成物における含有形態としては、遊離の化合物(以下、適宜「[D]酸拡散制御剤」とも称する。)の形態でも、重合体の一部として組み込まれた形態でも、これらの両方の形態でもよい。
当該ドライ露光用フォトレジスト組成物は通常[E]溶媒を含有する。溶媒は少なくとも上記[A]重合体、[B]酸発生体、[C]界面活性剤及び必要に応じて加えられる任意成分を溶解できれば特に限定されない。
メタノール、エタノール、n−プロパノール、iso−プロパノール、n−ブタノール、iso−ブタノール、sec−ブタノール、tert−ブタノール、n−ペンタノール、iso−ペンタノール、2−メチルブタノール、sec−ペンタノール、tert−ペンタノール、3−メトキシブタノール、n−ヘキサノール、2−メチルペンタノール、sec−ヘキサノール、2−エチルブタノール、sec−ヘプタノール、3−ヘプタノール、n−オクタノール、2−エチルヘキサノール、sec−オクタノール、n−ノニルアルコール、2,6−ジメチル−4−ヘプタノール、n−デカノール、sec−ウンデシルアルコール、トリメチルノニルアルコール、sec−テトラデシルアルコール、sec−ヘプタデシルアルコール、フルフリルアルコール、フェノール、シクロヘキサノール、メチルシクロヘキサノール、3,3,5−トリメチルシクロヘキサノール、ベンジルアルコール、ジアセトンアルコール等のモノアルコール系溶媒;
エチレングリコール、1,2−プロピレングリコール、1,3−ブチレングリコール、2,4−ペンタンジオール、2−メチル−2,4−ペンタンジオール、2,5−ヘキサンジオール、2,4−ヘプタンジオール、2−エチル−1,3−ヘキサンジオール、ジエチレングリコール、ジプロピレングリコール、トリエチレングリコール、トリプロピレングリコール等の多価アルコール系溶媒;
エチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル、エチレングリコールモノプロピルエーテル、エチレングリコールモノブチルエーテル、エチレングリコールモノヘキシルエーテル、エチレングリコールモノフェニルエーテル、エチレングリコールモノ−2−エチルブチルエーテル、ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノエチルエーテル、ジエチレングリコールモノプロピルエーテル、ジエチレングリコールモノブチルエーテル、ジエチレングリコールモノヘキシルエーテル、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、プロピレングリコールモノプロピルエーテル、プロピレングリコールモノブチルエーテル、ジプロピレングリコールモノメチルエーテル、ジプロピレングリコールモノエチルエーテル、ジプロピレングリコールモノプロピルエーテル等の多価アルコール部分エーテル系溶媒等が挙げられる。
n−ペンタン、iso−ペンタン、n−ヘキサン、iso−ヘキサン、n−ヘプタン、iso−ヘプタン、2,2,4−トリメチルペンタン、n−オクタン、iso−オクタン、シクロヘキサン、メチルシクロヘキサン等の脂肪族炭化水素系溶媒;
ベンゼン、トルエン、キシレン、メシチレン、エチルベンゼン、トリメチルベンゼン、メチルエチルベンゼン、n−プロピルベンゼン、iso−プロピルベンゼン、ジエチルベンゼン、iso−ブチルベンゼン、トリエチルベンゼン、ジ−iso−プロピルベンセン、n−アミルナフタレン等の芳香族炭化水素系溶媒等が挙げられる。
当該ドライ露光用フォトレジスト組成物は、その他の任意成分として、必要に応じ、例えば、脂環式骨格含有化合物、増感剤、ハレーション防止剤、保存安定化剤、消泡剤等をさらに含有してもよい。
脂環式骨格含有化合物は、ドライエッチング耐性、パターン形状、基板との接着性等を改善する効果を奏する。
1−アダマンタンカルボン酸、2−アダマンタノン、1−アダマンタンカルボン酸t−ブチル等のアダマンタン誘導体類;
デオキシコール酸t−ブチル、デオキシコール酸t−ブトキシカルボニルメチル、デオキシコール酸2−エトキシエチル等のデオキシコール酸エステル類;
リトコール酸t−ブチル、リトコール酸t−ブトキシカルボニルメチル、リトコール酸2−エトキシエチル等のリトコール酸エステル類;
3−〔2−ヒドロキシ−2,2−ビス(トリフルオロメチル)エチル〕テトラシクロ[4.4.0.12,5.17,10]ドデカン、2−ヒドロキシ−9−メトキシカルボニル−5−オキソ−4−オキサ−トリシクロ[4.2.1.03,7]ノナン等が挙げられる。これらの脂環式骨格含有化合物は単独で使用してもよく2種以上を併用してもよい。
増感剤は、[B]酸発生体の生成量を増加する作用を示すものであり、当該組成物の「みかけの感度」を向上させる効果を奏する。
当該ドライ露光用フォトレジスト組成物は、通常、全固形分濃度が1〜50質量%、好ましくは1〜25質量%となるように[E]溶媒に溶解した後、例えば、孔径0.05μm程度のフィルターでろ過することによって調製される。
本発明のパターン形成方法は、
(1)当該ドライ露光用フォトレジスト組成物を基板上に塗布し、レジスト膜を形成する工程、
(2)上記レジスト膜を気体を介して露光する工程、
(3)上記露光されたレジスト膜を加熱する工程、及び
(4)上記加熱されたレジスト膜を現像する工程
を有する。当該レジストパターン形成方法は、上述の当該ドライ露光用フォトレジスト組成物を用いているので、ドライ露光を行って形成されたレジストパターンにおける現像欠陥の発生を抑制することができ、さらなる加工の微細化が可能となる。以下、各工程について説明する。
東ソー社製の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。
[A]重合体の13C−NMR分析は、日本電子製の「JNM−EX400」を用い、測定した。測定溶媒には重クロロホルムを用いた。
[A]重合体の合成に用いた単量体化合物を以下に示す。
上記化合物(M−1)27.64g(60モル%)、化合物(M−8)10.20g(20モル%)及び上記化合物(M−9)12.17g(20モル%)を、2−ブタノン100gに溶解した溶液を得た後、この溶液にAIBN2.25g(5モル%)を加えて溶解させ単量体溶液を準備した。
用いる単量体化合物の総質量を50.0gとし、下記表1に示す種類及び仕込み量(モル%)の単量体化合物を用いた以外は、合成例1と同様にして、重合体(A−2)〜(A−10)を合成した。なお、表1中の「−」は、対応する単量体化合物を用いなかったことを示す。得られた重合体(A−2)〜(A−10)のMw、Mw/Mn、収率、及び重合体中の各単量体に由来する構造単位の含有割合(モル%)の測定結果を合わせて表1に示す。
ドライ露光用フォトレジスト組成物の調製に用いた[B]酸発生剤、[C]界面活性剤、[D]酸拡散抑制剤、及び[E]溶媒について以下に示す。
B−1:トリフェニルスルホニウム1,1,2,2−テトラフルオロ−6−(1−アダマンタンカルボニロキシ)−ヘキサン−1−スルホネート
B−2:トリフェニルスルホニウム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
B−3: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:FTX−218G(ネオス製)
C−2:FTS−240G(ネオス製)
C−3:メガファックF−176(DIC製)
D−1:N−(t−アミルオキシカルボニル)−4−ヒドロキシピペリジン
E−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
E−2:シクロヘキサノン
E−3:γ−ブチロラクトン
[A]重合体として(A−1)を100質量部、[B]酸発生剤として(B−1)を8質量部、[C]界面活性剤として(C−1)を3質量部、[D]酸拡散制御剤として(D−1)を1質量部、並びに[E]溶媒として(E−1)を1,520質量部、(E−2)を170質量部、(E−3)を30質量部混合した後、孔径0.05μmのフィルターでろ過して実施例1のドライ露光用フォトレジスト組成物を調製した。
下記表1に示す種類及び配合量の各成分を用いた以外は実施例1と同様にして、実施例2〜12及び比較例1〜7の各ドライ露光用フォトレジスト組成物を調製した。なお、表2中の「−」は、対応する成分を用いなかったことを示す。
上記得られた実施例1〜12及び比較例1〜7のドライ露光用フォトレジスト組成物を用いて下記方法により、レジストパターンを形成した。
上記レジストパターンが形成された評価用基板について、下記方法により現像欠陥数を測定し、評価した。
Claims (4)
- [A]酸解離性基を有する重合体、
[B]酸発生体、及び
[C]界面活性剤
を含有し、
[A]重合体100質量部に対する[C]界面活性剤の含有量が、2質量部以上4質量部以下であり、
[A]重合体が、下記式(1)で表される構造単位(I)を含有し、
[A]重合体における全構造単位に対する構造単位(I)の含有割合が、40モル%以上70モル%以下であるドライ露光用フォトレジスト組成物。
- [C]界面活性剤が、フッ素原子又はケイ素原子を有するノニオン系界面活性剤である請求項1に記載のドライ露光用フォトレジスト組成物。
- ArFエキシマレーザーによる露光用である請求項1又は請求項2に記載のドライ露光用フォトレジスト組成物。
- (1)請求項1から請求項3のいずれか1項に記載のドライ露光用フォトレジスト組成物を基板上に塗布し、レジスト膜を形成する工程、
(2)上記レジスト膜を気体を介して露光する工程、
(3)露光された上記レジスト膜を加熱する工程、及び
(4)加熱された上記レジスト膜を現像する工程
を有するレジストパターン形成方法。
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