JP2012181306A - 化学増幅レジスト材料及びパターン形成方法 - Google Patents
化学増幅レジスト材料及びパターン形成方法 Download PDFInfo
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- JP2012181306A JP2012181306A JP2011043556A JP2011043556A JP2012181306A JP 2012181306 A JP2012181306 A JP 2012181306A JP 2011043556 A JP2011043556 A JP 2011043556A JP 2011043556 A JP2011043556 A JP 2011043556A JP 2012181306 A JP2012181306 A JP 2012181306A
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- 125000003342 alkenyl group Chemical group 0.000 claims description 27
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- 125000002960 margaryl 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])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 6
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- 125000005459 perfluorocyclohexyl group Chemical group 0.000 description 1
- 125000005004 perfluoroethyl group Chemical group FC(F)(F)C(F)(F)* 0.000 description 1
- 125000005005 perfluorohexyl group Chemical group FC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)* 0.000 description 1
- 125000005008 perfluoropentyl group Chemical group FC(C(C(C(C(F)(F)F)(F)F)(F)F)(F)F)(F)* 0.000 description 1
- 125000005009 perfluoropropyl group Chemical group FC(C(C(F)(F)F)(F)F)(F)* 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- GJSGGHOYGKMUPT-UHFFFAOYSA-N phenoxathiine Chemical compound C1=CC=C2OC3=CC=CC=C3SC2=C1 GJSGGHOYGKMUPT-UHFFFAOYSA-N 0.000 description 1
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- DFOXKPDFWGNLJU-UHFFFAOYSA-N pinacolyl alcohol Chemical compound CC(O)C(C)(C)C DFOXKPDFWGNLJU-UHFFFAOYSA-N 0.000 description 1
- 229920000636 poly(norbornene) polymer Polymers 0.000 description 1
- 229920000734 polysilsesquioxane polymer Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 150000003141 primary amines Chemical class 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- TVSBRLGQVHJIKT-UHFFFAOYSA-N propan-2-ylcyclopentane Chemical compound CC(C)C1CCCC1 TVSBRLGQVHJIKT-UHFFFAOYSA-N 0.000 description 1
- 125000002572 propoxy group Chemical group [*]OC([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 1
- 125000005767 propoxymethyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])[#8]C([H])([H])* 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 239000012966 redox initiator Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000001226 reprecipitation Methods 0.000 description 1
- 238000006798 ring closing metathesis reaction Methods 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 238000007152 ring opening metathesis polymerisation reaction Methods 0.000 description 1
- 229930195734 saturated hydrocarbon Natural products 0.000 description 1
- 150000003335 secondary amines Chemical class 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 125000003011 styrenyl group Chemical class [H]\C(*)=C(/[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 125000001273 sulfonato group Chemical group [O-]S(*)(=O)=O 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- WMOVHXAZOJBABW-UHFFFAOYSA-N tert-butyl acetate Chemical compound CC(=O)OC(C)(C)C WMOVHXAZOJBABW-UHFFFAOYSA-N 0.000 description 1
- JZFHXRUVMKEOFG-UHFFFAOYSA-N tert-butyl dodecaneperoxoate Chemical compound CCCCCCCCCCCC(=O)OOC(C)(C)C JZFHXRUVMKEOFG-UHFFFAOYSA-N 0.000 description 1
- JAELLLITIZHOGQ-UHFFFAOYSA-N tert-butyl propanoate Chemical compound CCC(=O)OC(C)(C)C JAELLLITIZHOGQ-UHFFFAOYSA-N 0.000 description 1
- 125000001973 tert-pentyl group Chemical group [H]C([H])([H])C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 150000003512 tertiary amines Chemical group 0.000 description 1
- 125000004192 tetrahydrofuran-2-yl group Chemical group [H]C1([H])OC([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- GVIJJXMXTUZIOD-UHFFFAOYSA-N thianthrene Chemical compound C1=CC=C2SC3=CC=CC=C3SC2=C1 GVIJJXMXTUZIOD-UHFFFAOYSA-N 0.000 description 1
- JWCVYQRPINPYQJ-UHFFFAOYSA-N thiepane Chemical compound C1CCCSCC1 JWCVYQRPINPYQJ-UHFFFAOYSA-N 0.000 description 1
- BISQTCXKVNCDDA-UHFFFAOYSA-N thiepine Chemical compound S1C=CC=CC=C1 BISQTCXKVNCDDA-UHFFFAOYSA-N 0.000 description 1
- AMIGYDGSJCJWSD-UHFFFAOYSA-N thiocane Chemical compound C1CCCSCCC1 AMIGYDGSJCJWSD-UHFFFAOYSA-N 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- IBBLKSWSCDAPIF-UHFFFAOYSA-N thiopyran Chemical compound S1C=CC=C=C1 IBBLKSWSCDAPIF-UHFFFAOYSA-N 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 125000000725 trifluoropropyl group Chemical group [H]C([H])(*)C([H])([H])C(F)(F)F 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 238000000233 ultraviolet lithography Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
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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
- G03F7/004—Photosensitive materials
- G03F7/038—Macromolecular compounds which are rendered insoluble or differentially wettable
- G03F7/0382—Macromolecular compounds which are rendered insoluble or differentially wettable the macromolecular compound being present in a chemically amplified negative photoresist composition
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- 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
-
- 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
-
- 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
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- G—PHYSICS
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- 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
- G03F7/0046—Photosensitive materials with perfluoro compounds, e.g. for dry lithography
-
- 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
- G03F7/0047—Photosensitive materials characterised by additives for obtaining a metallic or ceramic pattern, e.g. by firing
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- G—PHYSICS
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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
- G03F7/004—Photosensitive materials
- G03F7/038—Macromolecular compounds which are rendered insoluble or differentially wettable
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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
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
- G03F7/0392—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition
- G03F7/0397—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition the macromolecular compound having an alicyclic moiety in a side chain
-
- G—PHYSICS
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- 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
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/11—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having cover layers or intermediate layers, e.g. subbing layers
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- G—PHYSICS
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- 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
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- Materials For Photolithography (AREA)
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
酸拡散制御能に非常に優れたクエンチャーとして、例えば、モルホリン構造と酸素官能基を有するアミン化合物が提案されており(特許文献1:特開2002−226470号公報)、解像性に優れるが、これを用いたレジスト材料の経時安定性が劣る場合があるという問題があった。また、保存安定性が比較的良好なクエンチャーとしては、例えばアニリン構造を有するクエンチャーが挙げられる(特許文献2,3:特開2010−266857号公報、特開2002−363146号公報参照)が、これらの化合物を適用した従来のレジスト材料においては、微細パターンにおける解像性が未だ不十分であった。
(B)下記一般式(2)で表される酸発生剤の1種又は2種以上、
(C)酸不安定基で保護された酸性官能基を有するアルカリ現像液不溶又は難溶の樹脂であって、該酸不安定基が脱保護されたときにアルカリ現像液可溶となるベース樹脂、
(D)有機溶剤
を必須成分として含有することを特徴とする化学増幅レジスト材料を提供する(請求項1)。
(式中、R1は、炭素数1〜20のアルキル基又はアルケニル基、又は炭素数6〜20の置換もしくは非置換のアリール基又はアラルキル基を表し、ヘテロ原子を含んでもよい。R2は、炭素数1〜10のアルキル基を表す。R3は、炭素数1〜10のアルキル基、又は炭素数1〜10のアルコキシ基を表す。kは1又は2、mは0〜5の整数である。)
(式中、R4は、ヘテロ原子を含んでもよい炭素数1〜30のアルキル基、アルケニル基又はアラルキル基を表すか、あるいは、(C)ベース樹脂の主鎖を表す。R5は、水素原子又はトリフルオロメチル基を表す。R6は、Arであるか、又は、ヘテロ原子を含んでもよい炭素数1〜20のアルキル基又はアルケニル基である。あるいは、R6同士が結合して両末端で結合する硫黄原子と共に炭素数5〜8の環を形成してもよい。Arはヘテロ原子を含んでもよい置換もしくは非置換の炭素数6〜20のアリール基である。)
(式中、R7は、水素原子又はメチル基を表す。Rfは、それぞれ独立に、炭素数1〜20のフルオロアルキル基を表す。Aは炭素数1〜30の(p+q+1)価の有機基を表す。p、qは、それぞれ独立に0〜5の整数を表し、p+q>0である。)
(式中、R4aは、ヘテロ原子を含んでもよい炭素数1〜30のアルキル基、アルケニル基又はアラルキル基を表す。R5は、水素原子又はトリフルオロメチル基を表す。R8は、水素原子、又はヘテロ原子を含んでもよい炭素数1〜20のアルキル基又はアルケニル基である。)
(式中、R1は、炭素数1〜20のアルキル基又はアルケニル基、又は炭素数6〜20の置換もしくは非置換のアリール基又はアラルキル基を表し、ヘテロ原子を含んでもよい。R2は、炭素数1〜10のアルキル基を表す。R3は、炭素数1〜10のアルキル基、又は炭素数1〜10のアルコキシ基を表す。mは0〜5の整数である。)
2)次いで加熱処理後、フォトマスクを介して波長300nm以下の高エネルギー線もしくは電子線で露光する工程と、
3)加熱処理した後、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を提供する(請求項8)。
(式中、R1は、炭素数1〜20のアルキル基又はアルケニル基、又は炭素数6〜20の置換もしくは非置換のアリール基又はアラルキル基を表し、ヘテロ原子を含んでもよい。R2は、炭素数1〜10のアルキル基を表す。R3は、炭素数1〜10のアルキル基、又は炭素数1〜10のアルコキシ基を表す。kは1又は2、mは0〜5の整数である。)
(式中、R1は、炭素数1〜20のアルキル基又はアルケニル基、又は炭素数6〜20の置換もしくは非置換のアリール基又はアラルキル基を表し、ヘテロ原子を含んでもよい。R2は、炭素数1〜10のアルキル基を表す。R3は、炭素数1〜10のアルキル基、又は炭素数1〜10のアルコキシ基を表す。mは0〜5の整数である。)
(式中、R4は、ヘテロ原子を含んでもよい炭素数1〜30のアルキル基、アルケニル基又はアラルキル基を表すか、あるいは、(C)ベース樹脂の主鎖を表す。R5は、水素原子又はトリフルオロメチル基を表す。R6は、Arであるか、又は、ヘテロ原子を含んでもよい炭素数1〜20のアルキル基又はアルケニル基である。あるいは、R6同士が結合して両末端で結合する硫黄原子と共に炭素数5〜8の環を形成してもよい。Arはヘテロ原子を含んでもよい置換もしくは非置換の炭素数6〜20のアリール基である。)
(式中、R4aは、ヘテロ原子を含んでもよい炭素数1〜30のアルキル基、アルケニル基又はアラルキル基を表す。R5は、水素原子又はトリフルオロメチル基を表す。R8は、水素原子、又はヘテロ原子を含んでもよい炭素数1〜20のアルキル基又はアルケニル基である。)
ここで強酸を発生する酸発生剤がオニウム塩である場合には上記のように高エネルギー線照射により生じた強酸が弱酸に交換することはできるが、高エネルギー線照射により生じた弱酸は未反応の強酸を発生するオニウム塩と衝突して塩交換を行うことはできない。これらはオニウムカチオンがより強酸のアニオンとイオン対を形成し易いという現象に起因する。
(式中、R7は、水素原子又はメチル基を表す。Rfは、それぞれ独立に、炭素数1〜20のフルオロアルキル基を表す。Aは炭素数1〜30の(p+q+1)価の有機基を表す。p、qは、それぞれ独立に0〜5の整数を表し、p+q>0である。)
(式中、R7は、水素原子又はメチル基を表す。R9は、それぞれ独立に、水素原子、フッ素原子、又はWと結合して環を形成する単結合を表す。Wは炭素数1〜30の(y+1)価の有機基を表し、あるいは、R9と結合して環を形成してもよい。yは1〜5、好ましくは1〜3の整数を表す。)
(A)前記一般式(1)で表される3級アミン化合物の1種又は2種以上、
(B)前記一般式(2)で表される酸発生剤の1種又は2種以上、
(C)酸不安定基で保護された酸性官能基を有するアルカリ現像液不溶又は難溶の樹脂であって、該酸不安定基が脱保護されたときにアルカリ現像液可溶となるベース樹脂、
(D)有機溶剤
を必須成分として、
(E)含フッ素高分子化合物、
(F)界面活性剤
を任意成分として、含有する。このうち、(A)、(B)、(E)については、前述の通りである。
R002は、水素原子、メチル基又は−CO2R003を示す。
R003は、炭素数1〜15の直鎖状、分岐状又は環状のアルキル基を示し、具体的にはメチル基、エチル基、プロピル基、イソプロピル基、n−ブチル基、sec−ブチル基、tert−ブチル基、tert−アミル基、n−ペンチル基、n−ヘキシル基、シクロペンチル基、シクロヘキシル基、エチルシクロペンチル基、ブチルシクロペンチル基、エチルシクロヘキシル基、ブチルシクロヘキシル基、アダマンチル基、エチルアダマンチル基、ブチルアダマンチル基等を例示できる。
炭素数1〜15の直鎖状、分岐状又は環状のアルキル基としては、具体的にはR003で例示したものと同様のものが例示できる。
Xは、−CH2又は酸素原子を示す。
kは、0又は1である。
R016は、水素原子又はメチル基を示す。R017は、炭素数1〜8の直鎖状、分岐状又は環状のアルキル基を示す。
(R2)において、f’、g’、h’、i’、j’は0以上1未満の数であり、f’+g’+h’+i’+j’=1を満足する。x’、y’、z’は0〜3の整数であり、1≦x’+y’+z’≦5、1≦y’+z’≦3を満足する。
また、式(L1)において、RL01、RL02は水素原子又は炭素数1〜18、好ましくは1〜10の直鎖状、分岐状又は環状のアルキル基を示し、具体的にはメチル基、エチル基、プロピル基、イソプロピル基、n−ブチル基、sec−ブチル基、tert−ブチル基、シクロペンチル基、シクロヘキシル基、2−エチルヘキシル基、n−オクチル基、アダマンチル基等が例示できる。RL03は炭素数1〜18、好ましくは炭素数1〜10の酸素原子等のヘテロ原子を有してもよい1価の炭化水素基を示し、直鎖状、分岐状又は環状のアルキル基、これらの水素原子の一部が水酸基、アルコキシ基、オキソ基、アミノ基、アルキルアミノ基等に置換されたものを挙げることができ、具体的には、直鎖状、分岐状又は環状のアルキル基としては上記RL01、RL02と同様のものが例示でき、置換アルキル基としては下記の基等が例示できる。
有機溶剤の使用量は、目標膜厚などに応じて設定すべきものであるが、おおむねベース樹脂100質量部に対して200〜15,000質量部、特に400〜8,000質量部が好適である。
本発明の化学増幅レジスト材料を調製し、次いで本発明のパターン形成方法を実施し、その解像性、保存安定性、欠陥性能につき評価を行った。
下記実施例及び比較例にて使用したベース樹脂、酸発生剤、クエンチャー、液浸保護膜用ポリマー、含フッ素高分子化合物の構造式を以下に示す。なお、下記例でMw、Mnはテトラヒドロフランを溶離液としたゲルパーミエーションクロマトグラフィー(GPC)により測定したポリスチレン換算の値である。
[実施例1−1]
各レジスト成分を以下に示す組成で混合した後、孔径0.1μmのテフロン(登録商標)フィルターを用いて濾過し、本発明のレジスト材料を調製した。
(A)クエンチャー:(Q−1)2.0質量部
(B)酸発生剤: (PAG 1)14.3質量部
(C)ベース樹脂: (Polymer 1)100質量部
(D)有機溶剤: プロピレングリコールメチルエーテルアセテート2,750質量部
シクロヘキサノン306質量部
(F)界面活性剤: 住友スリーエム(株)製 FC−4430 0.01質量部
実施例1−1より成分(A)又は(B)を変更し、下表に示した組成で混合した後、孔径0.1μmのテフロン(登録商標)フィルターを用いて濾過し、各レジスト材料を調製した。成分(C)、(D)、(F)については実施例1−1と同一種、同一量を配合した。
下表に示した組成で各成分を混合した後、孔径0.1μmのテフロン(登録商標)フィルターを用いて濾過し、液浸保護膜材料(TC−1)を調製した。
[解像性の評価]ArF液浸露光(保護膜使用)
[実施例2−1〜2−4、比較例2−1〜2−4]
シリコン基板上に反射防止膜溶液(日産化学工業(株)製、ARC−29A)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)基板上にレジスト溶液をスピンコーティングし、ホットプレートを用いて120℃で60秒間ベークし、90nm膜厚のレジスト膜を作製した。次いで、フォトレジスト膜上に液浸保護膜材料(TC−1)を塗布し、90℃で60秒間ベークして膜厚50nmの保護膜を形成した。これをArFエキシマレーザースキャナー((株)ニコン製、NSR−S610C、NA=1.30、クロスポール照明(ブレード角70度)、6%ハーフトーン位相シフトマスク)を用いて液浸露光し、100℃で60秒間ベーク(PEB)を施した後、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を用いて60秒間現像を行い、1:1のラインアンドスペースパターンを形成した。作製したパターン付きウエハーを上空SEM(走査型電子顕微鏡)で観察し、50nmのライン・アンド・スペースを1:1で解像する露光量(最適露光量)において分離解像している1:1のライン・アンド・スペース・パターンの最小寸法を限界解像性(マスク上寸法、1nm刻み、寸法が小さいほど良好)とした。また、断面SEMにより、50nmの1:1のライン・アンド・スペース・パターンのパターン形状を観察した。結果を下表に示す。
[保存安定性の評価]
[実施例3−1〜3−4、比較例3−1]
上記の評価の結果、解像性良好であったレジスト材料につき、25℃で3ヶ月保存後に解像性能の再評価を行った。評価方法は上記と同様である。結果を下表に示す。
[実施例4−1]
各レジスト成分を以下に示す組成で混合した後、0.02μmサイズの高密度ポリエチレンフィルターで精密濾過し、本発明のレジスト材料を調製した。
(A)クエンチャー:(Q−3)2.6質量部
(B)酸発生剤: (PAG 1)14.3質量部
(C)ベース樹脂: (Polymer 1)100質量部
(D)有機溶剤: プロピレングリコールメチルエーテルアセテート2,750質量部
シクロヘキサノン306質量部
(E)含フッ素高分子化合物:(Polymer 3)8.8質量部
(F)界面活性剤: 住友スリーエム(株)製 FC−4430 0.01質量部
実施例4−1より成分(A)、(B)又は(E)を変更し、下表に示した組成で混合した後、0.02μmサイズの高密度ポリエチレンフィルターで精密濾過し、各レジスト材料を調製した。成分(C)、(D)、(F)については実施例4−1と同一種、同一量を配合した。
[解像性の評価]ArF液浸露光(保護膜不使用)
[実施例5−1〜5−4、比較例5−1〜5−4]
シリコン基板上に反射防止膜溶液(日産化学工業(株)製、ARC−29A)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)基板上にレジスト溶液をスピンコーティングし、ホットプレートを用いて120℃で60秒間ベークし、90nm膜厚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、NA=1.30、クロスポール照明(ブレード角70度)、6%ハーフトーン位相シフトマスク)を用いて液浸露光し、100℃で60秒間ベーク(PEB)を施した後、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を用いて60秒間現像を行い、1:1のライン・アンド・スペース・パターンを形成した。作製したパターン付きウエハーを上空SEM(走査型電子顕微鏡)で観察し、50nmのライン・アンド・スペースを1:1で解像する露光量(最適露光量)において分離解像している1:1のライン・アンド・スペース・パターンの最小寸法を限界解像性(マスク上寸法、1nm刻み、寸法が小さいほど良好)とした。
[実施例5−1〜5−4、比較例5−1〜5−4]
各レジスト材料につき、別途上記と同様にパターンつきウエハーを作製した。各ウエハーでのパターン上の水残り欠陥数を、欠陥検査装置及びSEM(走査型電子顕微鏡)により調べた。水残り欠陥(WM;Water Mark)とは、パターンが湾曲した欠陥であり、湾曲した部分がライン数本に渡って円形に広がる特徴を有する。水残り欠陥は液浸水由来の残余水滴が引き起こす欠陥と考えられており、レジスト膜表面の撥水性が不足した場合に発生し易い傾向がある。
また、各レジスト材料につき、8インチのシリコン基板上に反射防止膜ARC−29A(日産化学工業(株)製)を成膜後(膜厚は87nm)、その上にレジスト溶液を塗布し、120℃で60秒間ベークして膜厚100nmのレジスト膜を作製した。次いで、ArFスキャナーS307E((株)ニコン製、NA0.85)で、ウエハー全面に20mm角の面積の露光部と未露光部が交互に配置(チェッカーフラッグ配置)されるようオープンフレーム露光をした。その後、100℃で60秒間ベーク(PEB)を施した後、2.38質量%のTMAH水溶液で60秒間現像を行った。チェッカーフラッグの未露光部分の欠陥個数を欠陥検査装置WinWin−50−1200((株)東京精密製)を用いてピクセルサイズ0.125μmで計測した。未露光部のレジスト表面に発生した欠陥はシミ状欠陥であり、前述のブロブ(Blob)欠陥に分類される。
得られた解像性、欠陥性能の評価結果を下表に示す。
[保存安定性の評価]
[実施例6−1〜6−4、比較例6−1,6−2]
上記の評価の結果、解像性、液浸欠陥ともに良好であったレジスト材料につき、25℃で1ヶ月保存後に、解像性、水残り欠陥の再評価を行った。評価方法は上記と同様である。結果を下表に示す。
Claims (8)
- (A)下記一般式(1)で表される3級アミン化合物の1種又は2種以上、
(B)下記一般式(2)で表される酸発生剤の1種又は2種以上、
(C)酸不安定基で保護された酸性官能基を有するアルカリ現像液不溶又は難溶の樹脂であって、該酸不安定基が脱保護されたときにアルカリ現像液可溶となるベース樹脂、
(D)有機溶剤
を必須成分として含有することを特徴とする化学増幅レジスト材料。
(式中、R1は、炭素数1〜20のアルキル基又はアルケニル基、又は炭素数6〜20の置換もしくは非置換のアリール基又はアラルキル基を表し、ヘテロ原子を含んでもよい。R2は、炭素数1〜10のアルキル基を表す。R3は、炭素数1〜10のアルキル基、又は炭素数1〜10のアルコキシ基を表す。kは1又は2、mは0〜5の整数である。)
(式中、R4は、ヘテロ原子を含んでもよい炭素数1〜30のアルキル基、アルケニル基又はアラルキル基を表すか、あるいは、(C)ベース樹脂の主鎖を表す。R5は、水素原子又はトリフルオロメチル基を表す。R6は、Arであるか、又は、ヘテロ原子を含んでもよい炭素数1〜20のアルキル基又はアルケニル基である。あるいは、R6同士が結合して両末端で結合する硫黄原子と共に炭素数5〜8の環を形成してもよい。Arはヘテロ原子を含んでもよい置換もしくは非置換の炭素数6〜20のアリール基である。) - 更に、(E)含フッ素高分子化合物を含有する請求項1記載の化学増幅レジスト材料。
- (E)成分の含フッ素高分子化合物として、フッ素原子を15質量%以上有し、アルカリ現像液の作用により一部分解して親水性が増大する高分子化合物を含有することを特徴とする請求項1記載の化学増幅レジスト材料。
- 更に、(F)界面活性剤を含有する請求項1乃至6いずれか1項記載の化学増幅レジスト材料。
- 1)請求項1乃至7のいずれか1項記載の化学増幅レジスト材料を基板上に塗布する工程と、
2)次いで加熱処理後、フォトマスクを介して波長300nm以下の高エネルギー線もしくは電子線で露光する工程と、
3)加熱処理した後、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。
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JP5655855B2 (ja) * | 2010-03-31 | 2015-01-21 | Jsr株式会社 | 感放射線性樹脂組成物、レジストパターン形成方法、重合体及び化合物 |
US10754248B2 (en) | 2017-03-22 | 2020-08-25 | Shin-Etsu Chemical Co., Ltd. | Sulfonium salt, resist composition, and patterning process |
US11579526B2 (en) | 2019-03-22 | 2023-02-14 | Shin-Etsu Chemical Co., Ltd. | Resist composition and patterning process |
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US20120225386A1 (en) | 2012-09-06 |
KR20150127772A (ko) | 2015-11-18 |
JP5434938B2 (ja) | 2014-03-05 |
TW201303508A (zh) | 2013-01-16 |
US8628908B2 (en) | 2014-01-14 |
TWI428696B (zh) | 2014-03-01 |
KR101576323B1 (ko) | 2015-12-09 |
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