JP7492492B2 - レジスト材料及びパターン形成方法 - Google Patents
レジスト材料及びパターン形成方法 Download PDFInfo
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- JP7492492B2 JP7492492B2 JP2021105311A JP2021105311A JP7492492B2 JP 7492492 B2 JP7492492 B2 JP 7492492B2 JP 2021105311 A JP2021105311 A JP 2021105311A JP 2021105311 A JP2021105311 A JP 2021105311A JP 7492492 B2 JP7492492 B2 JP 7492492B2
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- 159000000000 sodium salts Chemical class 0.000 description 1
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- 150000003510 tertiary aliphatic amines Chemical class 0.000 description 1
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- 125000001544 thienyl group Chemical group 0.000 description 1
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- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- ZFDIRQKJPRINOQ-UHFFFAOYSA-N transbutenic acid ethyl ester Natural products CCOC(=O)C=CC ZFDIRQKJPRINOQ-UHFFFAOYSA-N 0.000 description 1
- 125000002889 tridecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000002948 undecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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Classifications
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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
- G03F7/004—Photosensitive materials
- G03F7/0045—Photosensitive materials with organic non-macromolecular light-sensitive compounds not otherwise provided for, e.g. dissolution inhibitors
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
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Description
ベースポリマーと酸発生剤を含有するレジスト材料であって、前記酸発生剤としてマレイミド基に結合するスルホン酸のスルホニウム塩又はヨードニウム塩を含有するレジスト材料である。
本発明のレジスト材料は、ベースポリマーと酸発生剤を含有するレジスト材料であって、マレイミド基に結合するスルホン酸のスルホニウム塩又はヨードニウム塩の酸発生剤を含む。
上記マレイミド基に結合するスルホン酸のスルホニウム塩又はヨードニウム塩は、下記一般式(A-1)又は(A-2)で表されるものであることが好ましい。
本発明のレジスト材料に含まれるベースポリマーは、ポジ型レジスト材料の場合、酸不安定基を含む繰り返し単位を含む。酸不安定基を含む繰り返し単位としては、下記一般式(a1)で表される繰り返し単位(以下、繰り返し単位a1ともいう。)又は下記一般式(a2)で表される繰り返し単位(以下、繰り返し単位a2ともいう。)が好ましい。
前述した成分に加えて、上記一般式(A-1)で表されるスルホニウム塩又は上記一般式(A-2)で表されるヨードニウム塩以外の酸発生剤(以下、その他の酸発生剤という。)、有機溶剤、界面活性剤、溶解阻止剤、架橋剤等を目的に応じて適宜組み合わせて配合してポジ型レジスト材料及びネガ型レジスト材料を構成することによって、ポジ型では露光部、ネガ型では未露光部において上記ベースポリマーが触媒反応により現像液に対する溶解速度が加速されるので、極めて高感度のポジ型レジスト材料及びネガ型レジスト材料とすることができる。
本発明のレジスト材料は、酸不安定基を含む場合には化学増幅ポジ型レジスト材料であり、酸不安定基を含まない場合には化学増幅ネガ型レジスト材料となる。
本発明のレジスト材料を種々の集積回路製造に用いる場合は、公知のリソグラフィー技術を適用することができる。
各モノマーを組み合わせて、溶剤であるTHF中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、単離、乾燥して、以下に示す組成のベースポリマー(ポリマー1~4)を得た。得られたベースポリマーの組成は1H-NMRにより、Mw及びMw/MnはGPC(溶剤:THF、標準:ポリスチレン)により確認した。
(1)レジスト材料の調製
界面活性剤としてオムノバ社製Polyfox PF-636を100ppm溶解させた溶剤に、表1に示す組成で各成分を溶解させた溶液を、0.2μmサイズのフィルターで濾過してレジスト材料を調製した。実施例1~19、比較例1、2はポジ型レジスト材料、実施例20、比較例3はネガ型レジスト材料である。
有機溶剤: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)
EL(乳酸エチル)
DAA(ジアセトンアルコール)
表1に示す各レジスト材料を、信越化学工業(株)製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20nm膜厚で形成したSi基板上にスピンコートし、ホットプレートを用いて105℃で60秒間プリベークして膜厚50nmのレジスト膜を作製した。これを、ASML社製EUVスキャナーNXE3400(NA0.33、σ0.9/0.6、クアドルポール照明、ウエハー上寸法がピッチ40nm、+20%バイアスのホールパターンのマスク)を用いて露光し、ホットプレート上で表1記載の温度で60秒間PEBを行い、2.38質量%TMAH水溶液で30秒間現像を行って、実施例1~19、比較例1及び2では寸法20nmのホールパターンを、実施例20、比較例3では寸法20nmのドットパターンを得た。(株)日立ハイテクノロジーズ製測長SEM(CG6300)を用いて、ホール又はドットが形成されるときの露光量を測定してこれを感度とし、ホール又はドット50個の寸法を測定して寸法バラツキ(CDU、3σ)を求めた。結果を表1に示す。
Claims (14)
- ベースポリマーと酸発生剤を含有するレジスト材料であって、前記酸発生剤としてマレイミド基に結合するスルホン酸のスルホニウム塩又はヨードニウム塩を含有するものであることを特徴とするレジスト材料。
- 前記マレイミド基に結合するスルホン酸のスルホニウム塩又はヨードニウム塩が、下記一般式(A-1)又は(A-2)で表されるものであることを特徴とする請求項1に記載のレジスト材料。
- 更に、有機溶剤、界面活性剤から選ばれる一種以上を含むものであることを特徴とする請求項1又は請求項2に記載のレジスト材料。
- 前記ベースポリマーが、更に、下記一般式(f1)~(f3)で表される繰り返し単位から選ばれる少なくとも1種を含むものであることを特徴とする請求項1から請求項3のいずれか一項に記載のレジスト材料。
- 前記ベースポリマーが、下記一般式(a1)で表される繰り返し単位、又は下記一般式(a2)で表される繰り返し単位を含むものであることを特徴とする請求項1から請求項4のいずれか一項に記載のレジスト材料。
- 更に、溶解阻止剤を含むものであることを特徴とする請求項5に記載のレジスト材料。
- 化学増幅ポジ型レジスト材料であることを特徴とする請求項5又は請求項6に記載のレジスト材料。
- 前記ベースポリマーが、酸不安定基を含まないものであることを特徴とする請求項1から請求項4のいずれか一項に記載のレジスト材料。
- 更に、架橋剤を含むものであることを特徴とする請求項8に記載のレジスト材料。
- 化学増幅ネガ型レジスト材料であることを特徴とする請求項8又は9に記載のレジスト材料。
- (1)請求項1から請求項10のいずれか一項に記載のレジスト材料を用いて、基板上にレジスト膜を形成する工程と、(2)前記レジスト膜を高エネルギー線で露光する工程と、(3)前記露光したレジスト膜を、現像液を用いて現像する工程とを含むことを特徴とするパターン形成方法。
- 前記工程(1)の後、前記工程(2)の前に、(1’)前記マレイミド基に結合するスルホン酸のスルホニウム塩又はヨードニウム塩が分解しない波長の光を前記レジスト膜全面に露光することを特徴とする請求項11に記載のパターン形成方法。
- 前記スルホニウム塩又はヨードニウム塩が分解しない波長を、波長300nmより長波長とすることを特徴とする請求項12に記載のパターン形成方法。
- 前記高エネルギー線を、KrFエキシマレーザー光、ArFエキシマレーザー光、電子線又は波長3~15nmの極端紫外線とすることを特徴とする請求項11から請求項13のいずれか一項に記載のパターン形成方法。
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