JP6583126B2 - 新規カルボン酸オニウム塩、化学増幅レジスト組成物、及びパターン形成方法 - Google Patents
新規カルボン酸オニウム塩、化学増幅レジスト組成物、及びパターン形成方法 Download PDFInfo
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- JP6583126B2 JP6583126B2 JP2016090752A JP2016090752A JP6583126B2 JP 6583126 B2 JP6583126 B2 JP 6583126B2 JP 2016090752 A JP2016090752 A JP 2016090752A JP 2016090752 A JP2016090752 A JP 2016090752A JP 6583126 B2 JP6583126 B2 JP 6583126B2
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- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2041—Exposure; Apparatus therefor in the presence of a fluid, e.g. immersion; using fluid cooling means
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- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/30—Imagewise removal using liquid means
- G03F7/32—Liquid compositions therefor, e.g. developers
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/30—Imagewise removal using liquid means
- G03F7/32—Liquid compositions therefor, e.g. developers
- G03F7/322—Aqueous alkaline compositions
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
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- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/30—Imagewise removal using liquid means
- G03F7/32—Liquid compositions therefor, e.g. developers
- G03F7/325—Non-aqueous compositions
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/38—Treatment before imagewise removal, e.g. prebaking
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- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70008—Production of exposure light, i.e. light sources
- G03F7/70025—Production of exposure light, i.e. light sources by lasers
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- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70216—Mask projection systems
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Description
1.下記式(1)で表されるカルボン酸オニウム塩。
2.Rf1及びRf2が、それぞれ独立に、フッ素原子又はトリフルオロメチル基である1のカルボン酸オニウム塩。
3.式(1)で表されるカルボン酸オニウム塩のアニオン部が、下記式から選ばれる構造である1又は2のカルボン酸オニウム塩。
4.1〜3のいずれかのカルボン酸オニウム塩からなる酸拡散制御剤。
5.(A)4の酸拡散制御剤、
(B)下記式(a)で表される繰り返し単位及び下記式(b)で表される繰り返し単位を含むポリマーを含むベース樹脂、
(C)光酸発生剤、及び
(D)有機溶剤
を含む化学増幅レジスト組成物。
6.前記ポリマーが、更に、下記式(c1)〜(c3)で表される繰り返し単位から選ばれる少なくとも1つを含む5の化学増幅レジスト組成物。
7.(C)光酸発生剤が、下記式(4)又は(5)で表されるものである5又は6の化学増幅レジスト組成物。
8.更に、(E)含窒素化合物を含む5〜7のいずれかの化学増幅レジスト組成物。
9.更に、(F)水に不溶又は難溶でアルカリ現像液に可溶な界面活性剤、及び/又は水及びアルカリ現像液に不溶又は難溶な界面活性剤を含む5〜8のいずれかの化学増幅レジスト組成物。
10.5〜9のいずれかの化学増幅レジスト組成物を基板上に塗布し、加熱処理をしてレジスト塗布膜を形成する工程と、フォトマスクを介してKrFエキシマレーザー、ArFエキシマレーザー、電子線又は極端紫外線で前記レジスト膜を露光する工程と、加熱処理した後、現像液を用いて現像する工程とを含むパターン形成方法。
11.前記露光が、屈折率1.0以上の液体を前記レジスト膜と投影レンズとの間に介在させて行う液浸露光である10のパターン形成方法。
12.前記レジスト膜の上に更に保護膜を形成し、該保護膜と投影レンズとの間に前記液体を介在させて液浸露光を行う11のパターン形成方法。
本発明のカルボン酸オニウム塩は、下記式(1)で表されるものである。
前記カルボン酸オニウム塩は、酸拡散制御剤(クエンチャー)として有用である。
本発明のレジスト組成物は、
(A)式(1)で表されるカルボン酸オニウム塩からなる酸拡散制御剤
を必須成分とし、その他の成分として
(B)ベース樹脂、
(C)光酸発生剤、
(D)有機溶剤
を含む。更に必要により、
(E)含窒素化合物
を配合でき、なお更に必要により、
(F)水に不溶又は難溶でアルカリ現像液に可溶な界面活性剤、及び/又は水及びアルカリ現像液に不溶又は難溶な界面活性剤(疎水性樹脂)、
更に必要により、
(G)その他の成分
を含むことができる。
(B)成分のベース樹脂は、下記式(a)で表される繰り返し単位及び下記式(b)で表される繰り返し単位を含むポリマーを含むものである。
(I)式(a)で表される繰り返し単位の1種又は2種以上を、好ましくは1〜60モル%、より好ましくは5〜50モル%、更に好ましくは10〜50モル%、
(II)式(b)で表される繰り返し単位の1種又は2種以上を、好ましくは40〜99モル%、より好ましくは50〜95モル%、更に好ましくは50〜90モル%、
(III)式(c1)〜(c3)から選ばれる繰り返し単位の1種又は2種以上を、好ましくは0〜30モル%、より好ましくは0〜20モル%、更に好ましくは0〜10モル%、及び
(IV)その他の単量体に由来する繰り返し単位の1種又は2種以上を、好ましくは0〜80モル%、より好ましくは0〜70モル%、更に好ましくは0〜50モル%。
(C)成分の光酸発生剤は、高エネルギー線照射により酸を発生する化合物であれば特に限定されない。好適な光酸発生剤としては、下記式(4)で表されるものが挙げられる。
(D)成分の有機溶剤としては、各成分を溶解可能なものであれば特に限定されない。このような有機溶剤としては、例えば、特開2008−111103号公報の段落[0144]〜[0145]に記載の、シクロヘキサノン、メチル−2−n−ペンチルケトン等のケトン類;3−メトキシブタノール、3−メチル−3−メトキシブタノール、1−メトキシ−2−プロパノール、1−エトキシ−2−プロパノール等のアルコール類;プロピ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、エチ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ジメチルエーテル、ジエチレングリコールジメチルエーテル等のエーテル類;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、乳酸エチル、ピルビン酸エチル、酢酸ブチル、3−メ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、酢酸tert−ブチル、プロピオン酸tert−ブチル、プロピレングリコールモノtert−ブチルエーテルアセテート等のエステル類;γ−ブチロラクトン等のラクトン類、及びこれらの混合溶剤が挙げられる。アセタール系の酸不安定基を用いる場合は、アセタールの脱保護反応を加速させるために高沸点のアルコール系溶剤、具体的にはジエチレングリコール、プロピレングリコール、グリセリン、1,4−ブタンジオール、1,3−ブタンジオール等を加えることもできる。
本発明のレジスト組成物は、(A)成分である酸拡散制御剤が必須成分であるが、これに加えて含窒素化合物を同じく酸拡散制御剤として添加することもできる。このような含窒素化合物としては、特開2008−111103号公報の段落[0146]〜[0164]に記載の、1級、2級又は3級アミン化合物、特にはヒドロキシ基、エーテル結合、エステル結合、ラクトン環、シアノ基、スルホン酸エステル結合を有するアミン化合物が挙げられる。また、特許第3790649号公報に記載の化合物のように、1級又は2級アミンをカーバメート基で保護した化合物も挙げることができる。
本発明のレジスト組成物は、更に(F)水に不溶又は難溶でアルカリ現像液に可溶な界面活性剤、及び/又は水及びアルカリ現像液に不溶又は難溶な界面活性剤(疎水性樹脂)を含んでもよい。このような界面活性剤としては、特開2010−215608号公報や特開2011−16746号公報に記載のものを参照することができる。
本発明のレジスト組成物は、酸により分解し酸を発生する化合物(酸増殖化合物)、有機酸誘導体、フッ素置換アルコール、酸の作用により現像液への溶解性が変化する重量平均分子量3,000以下の化合物(溶解阻止剤)等を含んでもよい。前記酸増殖化合物としては、特開2009−269953号公報又は特開2010−215608号公報に記載の化合物を参照できる。前記酸増殖化合物の配合量は、(A)ベース樹脂100質量部に対し、0〜5質量部が好ましく、0〜3質量部がより好ましい。配合量が多すぎると、拡散の制御が難しく、解像性の劣化、パターン形状の劣化が起こることがある。前記有機酸誘導体、フッ素置換アルコール及び溶解阻止剤としては、特開2009−269953号公報又は特開2010−215608号公報に記載の化合物を参照できる。
本発明は、更に、前述したレジスト組成物を用いたパターン形成方法を提供する。本発明のレジスト組成物を使用してパターンを形成するには、公知のリソグラフィー技術を採用して行うことができる。具体的には、例えば、集積回路製造用の基板(Si、SiO2、SiN、SiON、TiN、WSi、BPSG、SOG、有機反射防止膜等)、あるいはマスク回路製造用の基板(Cr、CrO、CrON、MoSi等)に、スピンコーティング等の手法で膜厚が0.05〜2μmとなるように本発明のレジスト組成物を塗布し、これをホットプレート上で好ましくは60〜150℃、1〜10分間、より好ましくは80〜140℃、1〜5分間プリベークし、レジスト膜を形成する。
・IR:サーモフィッシャーサイエンティフィック社製、NICOLET 6700
・1H-NMR:日本電子(株)製、ECA-500
・19F-NMR:日本電子(株)製、ECA-500
・MALDI-TOF-MS:日本電子(株)製、S3000
[合成例1]中間体Aの合成
IR (D-ATR): ν= 3400, 3060, 1650, 1582, 1476, 1448, 1329, 1294, 1274, 1226, 1195, 1139, 1066, 1032, 999, 905, 882, 749, 703, 684, 613 cm-1.
MALDI-TOF-MS: POSITIVE M+263(C18H15S+相当)
NEGATIVE M-225(C5H3F6O3 -相当)
IR (D-ATR): ν= 3469, 3060, 3022, 2965, 2908, 2871, 1653, 1588, 1468, 1402, 1366, 1328, 1293, 1272, 1222, 1191, 1138, 1112, 1072, 1032, 1000, 902, 833, 725, 702, 682, 636, 597 cm-1.
MALDI-TOF-MS: POSITIVE M+431(C30H39S+相当)
NEGATIVE M-225(C5H3F6O3 -相当)
IR (D-ATR): ν= 3394, 3059, 2947, 2864, 1645, 1589, 1476, 1447, 1329, 1294, 1274, 1227, 1195, 1140, 1069, 1033, 1000, 906, 883, 854, 831, 787, 749, 703, 684, 628, 613, 571, 556 cm-1.
MALDI-TOF-MS: POSITIVE M+397(C28H29S+相当)
NEGATIVE M-225(C5H3F6O3 -相当)
対応する原料及び公知の有機化学反応を利用し、下記式で表されるカルボン酸オニウム塩Q−4〜Q−6を合成した。
本発明のレジスト組成物に用いるポリマーを以下に示す処方で合成した。なお、得られたポリマーの重量平均分子量(Mw)は、溶剤としてテトラヒドロフランを用いたゲルパーミエーションクロマトグラフィー(GPC)によりポリスチレン換算値として測定した。
窒素雰囲気下、フラスコに、メタクリル酸3−ヒドロキシ−1−アダマンチル4.7g、α−メタクリルオキシ−γ−ブチロラクトン16.9g、メタクリル酸3−エチル−3−exo−テトラシクロ[4.4.0.12,5.17,10]ドデシル10.4g、メタクリル酸1−tert−ブチルシクロペンチル10.4g、V−601(和光純薬工業(株)製)0.46g、2−メルカプトエタノール0.39g、及び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)を79gとり、単量体−重合開始剤溶液を調製した。窒素雰囲気とした別のフラスコにPGMEAを26gとり、攪拌しながら80℃まで加熱した後、前記単量体−重合開始剤溶液を4時間かけて滴下した。滴下終了後、重合液の温度を80℃に保ったまま2時間攪拌を続け、次いで室温まで冷却した。得られた重合液を、激しく攪拌したメタノール640gに滴下し、析出したポリマーをろ別した。得られたポリマーをメタノール240gで2回洗浄した後、50℃で20時間真空乾燥して白色粉末状のポリマーP1を得た(収量35.3g、収率88%)。GPCにて分析したところ、ポリマーP1のMwは6,480、分散度は1.74であった。
モノマーの種類、配合比を変えた以外は、合成例2−1と同様の手順により、表1に示すポリマーを製造した。なお、表1において、導入比はモル比である。また表1中、各単位の構造を下記表2〜4に示す。
[実施例2−1〜2−19、比較例1−1〜1−8]
酸拡散制御剤(Q−1〜Q−6)、比較用酸拡散制御剤(Q−A〜Q−H)、ポリマー(P1〜P14)、光酸発生剤(PAG−X〜PAG−Z)、及びアルカリ可溶型界面活性剤SF−1を、下記表5及び6に示す組成で、界面活性剤A(オムノバ社製)0.01質量%を含む溶剤中に溶解して溶液を調製し、該溶液を0.2μmのテフロン(登録商標)製フィルターでろ過することにより、レジスト組成物を調製した。
・溶剤:PGMEA(プロピレングリコールモノメチルエーテルアセテート)
GBL(γ−ブチロラクトン)
ポリ(メタクリル酸2,2,3,3,4,4,4−へプタフルオロ−1−イソブチル−1−ブチル・メタクリル酸9−(2,2,2−トリフルオロ−1−トリフルオロエチルオキシカルボニル)−4−オキサトリシクロ[4.2.1.03,7]ノナン−5−オン−2−イル)
Mw=7,700、分散度=1.82
3−メチル−3−(2,2,2−トリフルオロエトキシメチル)オキセタン・テトラヒドロフラン・2,2−ジメチル−1,3−プロパンジオール共重合物(オムノバ社製)
Mw=1,500
[実施例3−1〜3−19、比較例2−1〜2−8]
シリコン基板上に反射防止膜溶液(日産化学工業(株)製ARC29A)を塗布し、200℃で60秒間ベークして作製した反射防止膜(100nm膜厚)基板上に、各レジスト組成物(R−1〜R−27)をスピンコーティングし、ホットプレートを用いて100℃で60秒間ベークし、膜厚90nmのレジスト膜を作製した。これをArFエキシマレーザースキャナー((株)ニコン製、NSR-S610C、NA1.30、二重極、Crマスク)を用いて液浸露光した後、80℃で60秒間PEBを施し、2.38質量%のテトラメチルアンモニウムヒドロキシドの水溶液で60秒間現像を行った。
レジストの評価は、40nmの1:1ラインアンドスペースパターンを対象とし、電子顕微鏡にて観察、ライン寸法幅が40nmとなる露光量を最適露光量(Eop、mJ/cm2)とした。最適露光量におけるパターン形状を比較し、良否を判別した。
欠陥密度(個/cm2)=検出された総欠陥数/検査面積
形成したパターン:40nmの1:1ラインアンドスペースの繰り返しパターン
欠陥検査条件:光源UV、検査ピクセルサイズ0.28μm、セルツーセルモード
本評価方法においては、良好:0.05個/cm2未満、不良:0.05個/cm2以上とした。
[実施例4−1〜4−19、比較例3−1〜3−8]
各レジスト組成物(R−1〜R−27)を、信越化学工業(株)製スピンオンカーボン膜ODL-50(カーボンの含有量が80質量%)を200nm、その上にケイ素含有スピンオンハードマスクSHB-A940(ケイ素の含有量が43質量%)を35nmの膜厚で成膜したトライレイヤープロセス用の基板上へスピンコーティングし、ホットプレートを用いて100℃で60秒間ベークし、膜厚100nmのレジスト膜を作製した。これをArF液浸エキシマレーザースキャナー((株)ニコン製、NSR-610C、NA1.30、σ0.98/0.78、4/5輪帯照明)を用いて、以下に説明するマスクA又はBを介してパターン露光を行った。
感度として、前記マスクAを用いた評価において、スペース幅50nm、ピッチ100nmのLSパターンが得られる最適な露光量Eop(mJ/cm2)を求めた。
露光裕度評価として、前記マスクAを用いたLSパターンにおける50nmのスペース幅の±10%(45〜55nm)の範囲内で形成される露光量から、次式により露光裕度(単位:%)を求めた。
EL(%)=(|E1−E2|/Eop)×100
E1:スペース幅45nm、ピッチ100nmのLSパターンを与える最適な露光量
E2:スペース幅55nm、ピッチ100nmのLSパターンを与える最適な露光量
Eop:スペース幅50nm、ピッチ100nmのLSパターンを与える最適な露光量
前記マスクAを用いた評価において、前記感度評価における最適露光量で照射してLSパターンを得た。(株)日立ハイテクノロジーズ製TDSEM(S-9380)でスペース幅の長手方向に10箇所の寸法を測定し、その結果から標準偏差(σ)の3倍値(3σ)をLWRとして求めた。この値が小さいほど、ラフネスが小さく均一なスペース幅のパターンが得られる。
前記マスクAを用いた評価において、マスクのピッチは固定したまま、マスクのライン幅を変えて、前記感度評価における最適露光量で照射してパターン形成した。マスクのライン幅とパターンのスペース幅の変化から、次式によりMEFの値を求めた。この値が1に近いほど性能が良好である。
MEF=(パターンのスペース幅/マスクのライン幅)−b
b:定数
前記マスクBを用いたトレンチパターンにおける35nmのスペース幅を形成する露光量及び焦点深度をそれぞれ最適露光量及び最適焦点深度としたまま、焦点深度を変化させたときに、35nmスペース幅の±10%(31.5〜38.5nm)の範囲内で形成される焦点深度(DOF)マージン(単位:nm)を求めた。この値が大きいほど焦点深度の変化に対するパターン寸法変化が小さく、焦点深度(DOF)マージンが良好である。
Claims (12)
- 下記式(1)で表されるカルボン酸オニウム塩。
- Rf1及びRf2が、それぞれ独立に、フッ素原子又はトリフルオロメチル基である請求項1記載のカルボン酸オニウム塩。
- 式(1)で表されるカルボン酸オニウム塩のアニオン部が、下記式から選ばれる構造である請求項1又は2記載のカルボン酸オニウム塩。
- 請求項1〜3のいずれか1項記載のカルボン酸オニウム塩からなる酸拡散制御剤。
- (A)請求項4記載の酸拡散制御剤、
(B)下記式(a)で表される繰り返し単位及び下記式(b)で表される繰り返し単位を含むポリマーを含むベース樹脂、
(C)光酸発生剤、及び
(D)有機溶剤
を含む化学増幅レジスト組成物。
- 前記ポリマーが、更に、下記式(c1)〜(c3)で表される繰り返し単位から選ばれる少なくとも1つを含む請求項5記載の化学増幅レジスト組成物。
- (C)光酸発生剤が、下記式(4)又は(5)で表されるものである請求項5又は6記載の化学増幅レジスト組成物。
- 更に、(E)含窒素化合物を含む請求項5〜7のいずれか1項記載の化学増幅レジスト組成物。
- 更に、(F)水に不溶又は難溶でアルカリ現像液に可溶な界面活性剤、及び/又は水及びアルカリ現像液に不溶又は難溶な界面活性剤を含む請求項5〜8のいずれか1項記載の化学増幅レジスト組成物。
- 請求項5〜9のいずれか1項記載の化学増幅レジスト組成物を基板上に塗布し、加熱処理をしてレジスト塗布膜を形成する工程と、フォトマスクを介してKrFエキシマレーザー、ArFエキシマレーザー、電子線又は極端紫外線で前記レジスト膜を露光する工程と、加熱処理した後、現像液を用いて現像する工程とを含むパターン形成方法。
- 前記露光が、屈折率1.0以上の液体を前記レジスト膜と投影レンズとの間に介在させて行う液浸露光である請求項10記載のパターン形成方法。
- 前記レジスト膜の上に更に保護膜を形成し、該保護膜と投影レンズとの間に前記液体を介在させて液浸露光を行う請求項11記載のパターン形成方法。
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