JP4553113B2 - 多孔質膜形成用組成物、パターン形成方法、及び多孔質犠性膜 - Google Patents
多孔質膜形成用組成物、パターン形成方法、及び多孔質犠性膜 Download PDFInfo
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- JP4553113B2 JP4553113B2 JP2004172236A JP2004172236A JP4553113B2 JP 4553113 B2 JP4553113 B2 JP 4553113B2 JP 2004172236 A JP2004172236 A JP 2004172236A JP 2004172236 A JP2004172236 A JP 2004172236A JP 4553113 B2 JP4553113 B2 JP 4553113B2
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Images
Classifications
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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
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/06—Preparatory processes
- C08G77/08—Preparatory processes characterised by the catalysts used
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
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- C09D183/06—Polysiloxanes containing silicon bound to oxygen-containing groups
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- G—PHYSICS
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Description
R1 n−Si−R2 4-n (1)
(式中、R1は互いに同一又は異種の、1価の有機基又は水素原子である。R2は互いに同一又は異種の、加水分解性基又は水酸基を示す。nは0〜3の整数である。)
で示される加水分解性シラン、その加水分解物及びその部分縮合物からなる群より選ばれる3種以上の珪素化合物(但し、R1として有機架橋性基を有する珪素化合物を少なくとも1種含み、かつR1として非架橋性基を有するn=1の珪素化合物とR 1 を有さないn=0の珪素化合物をそれぞれ含む)を、後述の一般式(2)で示される第四級アンモニウム水酸化物を加水分解触媒として使用して加水分解及び縮合させて得られる、上記有機架橋性基による架橋反応可能な重合体を用い、有機架橋により得られる多孔質膜がレジストとのインターミキシング、レジスト層への低分子成分の拡散がなく、レジストとのエッチング比も良好でありながら、有機架橋性部分の効果により他のシリコーン系材料との間にウエットエッチング選択性が得られることを見出した。あわせて、多孔質膜が光吸収基を有することにより、反射防止機能を有することもでき、また有機架橋部分を熱分解することにより、ウエットエッチング速度を促進することができることを見出し、本発明をなすに至った。
請求項1:
(A)下記一般式(1)
R1 n−Si−R2 4-n (1)
(式中、R1は互いに同一又は異種の、1価の有機基又は水素原子である。R2は互いに同一又は異種の、加水分解性基又は水酸基を示す。nは0〜3の整数である。)
で示される加水分解性シラン、その加水分解物及びその部分縮合物からなる群より選ばれる3種以上の珪素化合物(但し、R1として有機架橋性基を有する珪素化合物を少なくとも1種含み、かつR1として非架橋性基を有するn=1の珪素化合物とR 1 を有さないn=0の珪素化合物をそれぞれ含む)を、下記一般式(2)
[R3 4N]+OH- (2)
(式中、R3は置換又は非置換の炭素数1〜4の1価炭化水素基を示す。)
で示される第四級アンモニウム水酸化物を加水分解触媒として使用し加水分解及び縮合させて得られる、上記有機架橋性基による架橋反応可能な重合体、
(B)有機溶剤、
(C)架橋剤
を含有してなることを特徴とする多孔質膜形成用組成物。
請求項2:
上記第四級アンモニウム水酸化物が、テトラメチルアンモニウムハイドロオキサイドであることを特徴とする請求項1記載の組成物。
請求項3:
有機架橋性基を有する珪素化合物が、エポキシ基又はアルコール性水酸基もしくはアルコール性水酸基へ変換される基を有するシランであることを特徴とする請求項1又は2記載の組成物。
請求項4:
(C)架橋剤が、メラミン化合物、グアナミン化合物、グリコールウリル化合物、ウレア化合物、エポキシ化合物、チオエポキシ化合物、イソシアネート化合物、アジド化合物、アルケニルエーテル基を含む化合物から選ばれる請求項1乃至3のいずれか1項記載の組成物。
請求項5:
更に、酸発生剤を含有する請求項1乃至4のいずれか1項記載の組成物。
請求項6:
更に、式(1)のR1として光吸収基である単環式又は縮合多環式芳香族炭化水素基を有する珪素化合物を含む請求項1乃至5のいずれか1項記載の組成物。
請求項7:
単環式又は縮合多環式芳香族炭化水素基が、ベンゼン環、ナフタレン環又はアントラセン環を有する基である請求項6記載の組成物。
請求項8:
リソグラフィーにより基板にパターンを形成する方法であって、低誘電率材料膜が形成された基板上に請求項1乃至5のいずれか1項記載の組成物を塗布し、ベークして犠牲膜を形成し、該犠牲膜上に反射防止膜を形成し、次いでフォトレジスト膜材料を塗布し、プリベークしてフォトレジスト膜を形成し、該フォトレジスト膜のパターン回路領域を露光した後、現像液で現像して該フォトレジスト膜にレジストパターンを形成し、該レジストパターンをマスクにして上記反射防止膜、上記犠牲膜、及び低誘電率材料膜をエッチングし、次いでストリップ液で犠牲膜を溶解除去して基板にパターンを形成することを含んでなるパターン形成方法。
請求項9:
リソグラフィーにより基板にパターンを形成する方法であって、低誘電率材料膜が形成された基板上に請求項1乃至5のいずれか1項記載の組成物を塗布し、ベークして犠牲膜を形成し、該犠牲膜上に反射防止膜を形成し、次いでフォトレジスト膜材料を塗布し、プリベークしてフォトレジスト膜を形成し、該フォトレジスト膜のパターン回路領域を露光した後、現像液で現像して該フォトレジスト膜にレジストパターンを形成し、該レジストパターンをマスクにして上記反射防止膜、上記犠牲膜、及び低誘電率材料膜をエッチングし、更にプラズマ処理した後、ストリップ液で犠牲膜を溶解除去して基板にパターンを形成することを含んでなるパターン形成方法。
請求項10:
リソグラフィーにより基板にパターンを形成する方法であって、低誘電率材料膜が形成された基板上に請求項6又は7記載の組成物を塗布し、ベークして犠牲膜を形成し、該犠牲膜上にフォトレジスト膜材料を塗布し、プリベークしてフォトレジスト膜を形成し、該フォトレジスト膜のパターン回路領域を露光した後、現像液で現像して該フォトレジスト膜にレジストパターンを形成し、該レジストパターンをマスクにして上記犠牲膜、及び低誘電率材料膜をエッチングし、次いでストリップ液で犠牲膜を溶解除去して基板にパターンを形成することを含んでなるパターン形成方法。
請求項11:
リソグラフィーにより基板にパターンを形成する方法であって、低誘電率材料膜が形成された基板上に請求項6又は7記載の組成物を塗布し、ベークして犠牲膜を形成し、該犠牲膜上にフォトレジスト膜材料を塗布し、プリベークしてフォトレジスト膜を形成し、該フォトレジスト膜のパターン回路領域を露光した後、現像液で現像して該フォトレジスト膜にレジストパターンを形成し、該レジストパターンをマスクにして上記犠牲膜、及び低誘電率材料膜をエッチングし、更にプラズマ処理した後、ストリップ液で犠牲膜を溶解除去して基板にパターンを形成することを含んでなるパターン形成方法。
請求項12:
請求項1乃至7のいずれか1項記載の多孔質膜形成用組成物を基板上に塗布し、ベークして得られる多孔質犠牲膜。
R1 n−Si−R2 4-n (1)
(式中、R1は互いに同一又は異種の、1価の有機基又は水素原子である。R2は互いに同一又は異種の、加水分解性基又は水酸基を示す。nは0〜3の整数である。)
で示される加水分解性シラン、その加水分解物及びその部分縮合物からなる群より選ばれる1種以上の珪素化合物(但し、R1として有機架橋性基を有する珪素化合物を少なくとも1種含む)を加水分解及び縮合させて得られる、上記有機架橋性基による架橋反応可能な重合体である。
(式中、R3は置換又は非置換の炭素数1〜4の1価炭化水素基、例えばメチル基、エチル基、プロピル基、ブチル基、ペンチル基、ヘキシル基を示す。)
まず、第一段階は、前述した各種加水分解性有機シラン化合物を水とアルコールの混合液中で加水分解、縮合する。加水分解に使用する水の量は、上記の諸条件を満足する組成に配合したシラン化合物あるいはその混合物100質量部に対して100〜5,000質量部使用するのがよい。100質量部未満ではシランの濃度が高すぎるため縮合反応性の制御が難しく、ゲルが生じる。また、5,000質量部を超過すると原料のシラン濃度が低すぎ、縮合反応が遅くなってしまう場合がある。アルコールはC1〜C4の低級アルコールが反応の制御のし易さから好ましい。水とアルコールの比は重量比で10/90〜90/10である。水の比率が少ないと加水分解が十分に進まずオリゴマー状態で反応が停止し多孔質膜が形成できない。水が多すぎると縮合が進みすぎてゾル状となり、均一な膜が形成できなくなる。
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。
(式中、R101a、R101b、R101cはそれぞれ炭素数1〜12の直鎖状、分岐状又は環状のアルキル基、アルケニル基、オキソアルキル基又はオキソアルケニル基、炭素数6〜20のアリール基、又は炭素数7〜12のアラルキル基又はアリールオキソアルキル基を示し、これらの基の水素原子の一部又は全部がアルコキシ基等によって置換されていてもよい。また、R101bとR101cとは環を形成してもよく、環を形成する場合には、R101b、R101cはそれぞれ炭素数1〜6のアルキレン基を示す。K-は非求核性対向イオンを表す。R101d、R101e、R101f、R101gは、R101a、R101b、R101cに水素原子を加えて示される。R101dとR101e、R101dとR101eとR101fとは環を形成してもよく、環を形成する場合には、R101dとR101e及びR101dとR101eとR101fは炭素数3〜10のアルキレン基を示す。)
(式中、R102a、R102bはそれぞれ炭素数1〜8の直鎖状、分岐状又は環状のアルキル基を示す。R103は炭素数1〜10の直鎖状、分岐状又は環状のアルキレン基を示す。R104a、R104bはそれぞれ炭素数3〜7の2−オキソアルキル基を示す。K-は非求核性対向イオンを表す。)
(式中、R107、R108、R109は炭素数1〜12の直鎖状、分岐状又は環状のアルキル基又はハロゲン化アルキル基、炭素数6〜20のアリール基又はハロゲン化アリール基、又は炭素数7〜12のアラルキル基を示す。R108、R109は互いに結合して環状構造を形成してもよく、環状構造を形成する場合、R108、R109はそれぞれ炭素数1〜6の直鎖状又は分岐状のアルキレン基を示す。)
(式中、R110は炭素数6〜10のアリーレン基、炭素数1〜6のアルキレン基又は炭素数2〜6のアルケニレン基を示し、これらの基の水素原子の一部又は全部は更に炭素数1〜4の直鎖状又は分岐状のアルキル基又はアルコキシ基、ニトロ基、アセチル基、又はフェニル基で置換されていてもよい。R111は炭素数1〜8の直鎖状、分岐状又は置換のアルキル基、アルケニル基又はアルコキシアルキル基、フェニル基、又はナフチル基を示し、これらの基の水素原子の一部又は全部は更に炭素数1〜4のアルキル基又はアルコキシ基;炭素数1〜4のアルキル基、アルコキシ基、ニトロ基又はアセチル基で置換されていてもよいフェニル基;炭素数3〜5のヘテロ芳香族基;又は塩素原子、フッ素原子で置換されていてもよい。)
(a)トリフルオロメタンスルホン酸テトラメチルアンモニウム、ノナフルオロブタンスルホン酸テトラメチルアンモニウム、ノナフルオロブタンスルホン酸テトラn−ブチルアンモニウム、ノナフルオロブタンスルホン酸テトラフェニルアンモニウム、p−トルエンスルホン酸テトラメチルアンモニウム、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(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。
p−トルエンスルホン酸2,6−ジニトロベンジル、p−トルエンスルホン酸2,4−ジニトロベンジル等のニトロベンジルスルホネート誘導体。
1,2,3−トリス(メタンスルホニルオキシ)ベンゼン、1,2,3−トリス(トリフルオロメタンスルホニルオキシ)ベンゼン、1,2,3−トリス(p−トルエンスルホニルオキシ)ベンゼン等のスルホン酸エステル誘導体。
なお、上記酸発生剤は1種を単独で又は2種以上を組み合わせて用いることができる。
また、低誘電率材料膜としては、CVD法により積層された有機SiO系膜、スピンコート法により塗布されたSiO系多孔質膜などが挙げられる。
5リットルのフラスコに超純水1,135g、エタノール1,135g、10%テトラメチルアンモニウムハイドロオキサイド水溶液83gを仕込み、窒素雰囲気下、30℃でメチルトリメトキシシラン51g、テトラエトキシシラン78g、フェニルトリメトキシシラン24g、3,4−エポキシシクロヘキシルエチルトリメトキシシラン54gの混合液を加えてよく混合した。1時間後、ここに酢酸5.5gを加え、更にプロピレングリコールモノメチルエーテルアセテート880gを加えた。これから減圧下(100hPa)でエタノールとメタノールを留去した。残液にエチルアセテート600gを加え、水層を分離後、有機層に超純水600gを加えて洗浄する工程を3回繰り返した。この有機層にプロピレングリコールモノプロピルエーテル1,200gを加えて減圧下(20hPa)で濃縮を行い、重合体1の1,000gの溶液を得た。不揮発分は11.0wt%であった。
5リットルのフラスコに超純水1,135g、エタノール1,135g、10%テトラメチルアンモニウムハイドロオキサイド水溶液83gを仕込み、窒素雰囲気下、30℃でメチルトリメトキシシラン51g、テトラエトキシシラン79g、フェニルトリメトキシシラン24g、グリシドキシプロピルトリメトキシシラン52gの混合液を加えてよく混合した。1時間後、ここに酢酸5.5gを加え、更にプロピレングリコールモノメチルエーテルアセテート880gを加えた。これから減圧下(100hPa)でエタノールとメタノールを留去した。残液にエチルアセテート600gを加え、水層を分離後、有機層に超純水600gを加えて洗浄する工程を3回繰り返した。この有機層にプロピレングリコールモノプロピルエーテル1,200gを加えて減圧下(20hPa)で濃縮を行い、重合体2の950gの溶液を得た。不揮発分は10.5wt%であった。
5リットルのフラスコに超純水1,135g、エタノール1,135g、10%テトラメチルアンモニウムハイドロオキサイド水溶液83gを仕込み、窒素雰囲気下、30℃でテトラエトキシシラン165g、フェニルトリメトキシシラン24g、グリシドキシプロピルトリメトキシシラン54gの混合液を加えてよく混合した。1時間後、ここに酢酸5.5gを加え、更にプロピレングリコールモノメチルエーテルアセテート880gを加えた。これから減圧下(100hPa)でエタノールとメタノールを留去した。残液にエチルアセテート600gを加え、水層を分離後、有機層に超純水600gを加えて洗浄する工程を3回繰り返した。この有機層にプロピレングリコールモノプロピルエーテル1,200gを加えて減圧下(20hPa)で濃縮を行い、重合体3の1,000gの溶液を得た。不揮発分は9.5wt%であった。
5リットルのフラスコに超純水1,135g、エタノール1,135g、10%テトラメチルアンモニウムハイドロオキサイド水溶液83gを仕込み、窒素雰囲気下、30℃でメチルトリメトキシシラン51g、テトラエトキシシラン78g、3,4−エポキシシクロヘキシルエチルトリメトキシシラン54gの混合液を加えてよく混合した。1時間後、ここに酢酸5.5gを加え、更にプロピレングリコールモノメチルエーテルアセテート880gを加えた。これから減圧下(100hPa)でエタノールとメタノールを留去した。残液にエチルアセテート600gを加え、水層を分離後、有機層に超純水600gを加えて洗浄する工程を3回繰り返した。この有機層にプロピレングリコールモノメチルエーテルアセテート300gを加えて減圧下(20hPa)で濃縮を行い、重合体4の1,100gの溶液を得た。不揮発分は8.5wt%であった。
製造例4で得られたプロピレングリコールモノメチルエーテルアセテート溶液のうち118gを1リットルのフラスコに入れて、これに9−カルボン酸アントラセン1.24gを加え、100℃で24時間反応させた。反応後、減圧下(20hPa)で溶媒を全て留去し、残渣にエチルアセテート500gを加えて溶解させた。これに超純水200gを加えて洗浄する工程を5回繰り返し、得られた有機層にプロピレングリコールモノメチルエーテルアセテート100gを加えて減圧下(20hPa)で濃縮を行い、重合体5の98gの溶液を得た。不揮発分は11.5wt%であった。
5リットルのフラスコに超純水1,135g、エタノール1,135g、10%テトラメチルアンモニウムハイドロオキサイド水溶液415gを仕込み、窒素雰囲気下、30℃でメチルトリメトキシシラン51g、テトラエトキシシラン78g、フェニルトリメトキシシラン24g、3−アセトキシプロピルトリメトキシシラン81gの混合液を加えてよく混合した。1時間後、ここに酢酸5.5gを加え、更にプロピレングリコールモノメチルエーテルアセテート880gを加えた。これから減圧下(100hPa)でエタノールとメタノールを留去した。残液にエチルアセテート600gを加え、水層を分離後、有機層に超純水600gを加えて洗浄する工程を3回繰り返した。この有機層にプロピレングリコールモノプロピルエーテル1,200gを加えて減圧下(20hPa)で濃縮を行い、重合体6の1,100gの溶液を得た。不揮発分は9.3wt%であった。
5リットルのフラスコに超純水1,135g、エタノール1,135g、ジメチルアミン4gを仕込み、窒素雰囲気下、30℃でメチルトリメトキシシラン51g、テトラエトキシシラン79g、フェニルトリメトキシシラン24g、グリシドキシプロピルトリメトキシシラン52gの混合液を加えてよく混合した。1時間後、ここに酢酸5.5gを加え、更にプロピレングリコールモノメチルエーテルアセテート880gを加えた。これから減圧下(100hPa)でエタノールとメタノールを留去した。残液にエチルアセテート600gを加え、水層を分離後、有機層に超純水600gを加えて洗浄する工程を3回繰り返した。この有機層にプロピレングリコールモノプロピルエーテル1,200gを加えて減圧下(20hPa)で濃縮を行い、重合体7の1,100gの溶液を得た。不揮発分は10.0wt%であった。
5リットルのフラスコに超純水1,135g、エタノール1,135g、10%テトラメチルアンモニウムハイドロオキサイド水溶液83gを仕込み、窒素雰囲気下、30℃でメチルトリメトキシシラン82g、テトラエトキシシラン125g、フェニルトリメトキシシラン38gの混合液を加えてよく混合した。1時間後、ここに酢酸5.5gを加え、更にプロピレングリコールモノメチルエーテルアセテート880gを加えた。これから減圧下(100hPa)でエタノールとメタノールを留去した。残液にエチルアセテート600gを加え、水層を分離後、有機層に超純水600gを加えて洗浄する工程を3回繰り返した。この有機層にプロピレングリコールモノプロピルエーテル1,200gを加えて減圧下(20hPa)で濃縮を行い、重合体8の1,000gの溶液を得た。不揮発分は10.5wt%であった。
5リットルのフラスコにアセトン123g、超純水72g、イソプロパノール297g、0.1M硝酸水溶液0.6gを仕込み、窒素雰囲気下、30℃でテトラエトキシシラン209g、フェニルトリメトキシシラン17gの混合液を加えてよく混合した。4時間加熱還流させたて重合体9の700gの溶液を得た。不揮発分は10.0wt%であった。
1リットルのフラスコに超純水59.5g、エタノール119g、1%マレイン酸水溶液59.5gを仕込み、窒素雰囲気下、40℃でフェニルトリメトキシシラン8g、3,4−エポキシシクロヘキシルエチルトリメトキシシラン41gの混合液を加えてよく混合した。4時間後、これから減圧下(100hPa)でエタノールとメタノールを留去した。残液にエチルアセテート200gを加え、超純水50gを加えて洗浄する工程を3回繰り返した。この有機層にプロピレングリコールモノメチルエーテルアセテート200gを加えて減圧下(20hPa)で濃縮を行い、重合体10の180gの溶液を得た。不揮発分は15.0wt%であった。
5リットルのフラスコに超純水915g、エタノール1,884g、10%テトラメチルアンモニウムハイドロオキサイド水溶液103gを仕込み、窒素雰囲気下、40℃でメチルトリメトキシシラン434g、テトラエトキシシラン662gの混合液を加えてよく混合した。4時間後、ここに酢酸10gを加え、更にプロピレングリコールモノメチルエーテルアセテート1,800gを加えた。これから減圧下(100hPa)でエタノールとメタノールを留去した。残液にエチルアセテート1,200gを加え、水層を分離後、有機層に超純水1,200gを加えて洗浄する工程を3回繰り返した。この有機層にプロピレングリコールモノプロピルエーテル2,400gを加えて減圧下(20hPa)で濃縮を行い、重合体11の2,400gの溶液を得た。不揮発分は16.4wt%であった。
上記製造例1〜11で得られた重合体溶液を用いて、表1に示す酸発生剤と架橋剤を加え、溶媒で固形分(=重合体と酸発生剤と架橋剤)が10wt%となるように希釈し、孔径0.1μmのPTFE製濾過膜で濾過することにより反射防止膜材料を調製した。
表1中の各組成は次の通りである。
重合体1〜11:製造例1〜11により得られたもの
架橋剤:CR1(下記構造式参照)
酸発生剤:AG1(下記構造式参照)
反射防止膜を形成後、J.A.ウーラム社の入射角度可変の分光エリプソメーター(VASE)で波長193nm又は248nmにおける反射防止膜の屈折率(n、k)を求め結果を表1に示した。
反射防止膜を削り取り、Quantachrome社のAutosorb−1を用いて窒素吸着表面積の分析を行い、平均細孔径、吸着表面積、2nm以下の吸着表面積の割合を求め、結果を表1に示した。
空孔の測定では、実施例1〜7は空孔を多く有していることが判り、特にテトラアルキルアンモニウムハイドロオキサイドを触媒とした実施例1〜6がより微細な空孔を含んでいることが判る。
表2中の各組成は次の通りである。
酸発生剤:PAG1(下記構造式参照)
パターン形状の観察
調製した反射防止膜材料(表1:実施例1〜6、参考例1、比較例1〜3)をシリコン基板上に塗布して200℃で120秒間ベークして膜厚193nmの反射防止膜を形成した。
次に、その上にArFレジストNo.1溶液を塗布し、130℃で60秒間ベークして膜厚193nmのフォトレジスト層を形成した。次いで、ArF露光装置(ニコン社製;S305B、NA0.68、σ0.85、2/3輪体照明、Crマスク)で露光し、110℃で60秒間ベーク(PEB)し、2.38質量%テトラメチルアンモニウムハイドロオキサイド(TMAH)水溶液で60秒間現像し、ポジ型のパターンを得た。得られたパターンの0.12μmL/Sのパターン形状を観察した。結果を表3に示す。
前記反射防止膜材料(実施例1〜6、参考例1、比較例1〜3)から形成した反射防止膜、及び前記フォトレジスト膜材料(レジストNo.1,2)から形成したフォトレジスト膜、及び製造例11から形成した多孔質低誘電率膜(誘電率2.3)のエッチング耐性について、以下のような条件で評価した。結果を表4に示す。
[CHF3/CF4系ガスでのエッチング試験]
東京エレクトロン株式会社製ドライエッチング装置TE−8500Pを用い、エッチング前後の反射防止膜、レジスト膜、SiO2膜の膜厚差を測定した。
エッチング条件は下記に示す通りである。
チャンバー圧力 40.0Pa
RFパワー 1,300W
ギャップ 9mm
CHF3ガス流量 30ml/min
CF4ガス流量 30ml/min
Arガス流量 100ml/min
時間 10sec
前記膜材料(実施例1〜6、参考例1、比較例1〜3、低誘電率絶縁膜)から形成した反射防止膜及び多孔質低誘電率膜のストリップ液に対する溶解性試験を行った。結果を表5に示す。
試験条件は以下に示す通りである。
第一工程:薬液浸漬前の熱処理
処理条件A:熱処理なし
処理条件B:大気下で350℃,90秒加熱
第二工程:薬液への浸漬
薬液:EKC−2255(EKCテクノロジー社製、塩基性剥離液)
浸漬条件:50℃,10分浸漬
2 低誘電率材料膜
2a 穴あるいは溝
3 犠牲膜
4 反射防止膜
5 フォトレジスト膜
Claims (12)
- (A)下記一般式(1)
R1 n−Si−R2 4-n (1)
(式中、R1は互いに同一又は異種の、1価の有機基又は水素原子である。R2は互いに同一又は異種の、加水分解性基又は水酸基を示す。nは0〜3の整数である。)
で示される加水分解性シラン、その加水分解物及びその部分縮合物からなる群より選ばれる3種以上の珪素化合物(但し、R1として有機架橋性基を有する珪素化合物を少なくとも1種含み、かつR1として非架橋性基を有するn=1の珪素化合物とR 1 を有さないn=0の珪素化合物をそれぞれ含む)を、下記一般式(2)
[R3 4N]+OH- (2)
(式中、R3は置換又は非置換の炭素数1〜4の1価炭化水素基を示す。)
で示される第四級アンモニウム水酸化物を加水分解触媒として使用し加水分解及び縮合させて得られる、上記有機架橋性基による架橋反応可能な重合体、
(B)有機溶剤、
(C)架橋剤
を含有してなることを特徴とする多孔質膜形成用組成物。 - 上記第四級アンモニウム水酸化物が、テトラメチルアンモニウムハイドロオキサイドであることを特徴とする請求項1記載の組成物。
- 有機架橋性基を有する珪素化合物が、エポキシ基又はアルコール性水酸基もしくはアルコール性水酸基へ変換される基を有するシランであることを特徴とする請求項1又は2記載の組成物。
- (C)架橋剤が、メラミン化合物、グアナミン化合物、グリコールウリル化合物、ウレア化合物、エポキシ化合物、チオエポキシ化合物、イソシアネート化合物、アジド化合物、アルケニルエーテル基を含む化合物から選ばれる請求項1乃至3のいずれか1項記載の組成物。
- 更に、酸発生剤を含有する請求項1乃至4のいずれか1項記載の組成物。
- 更に、式(1)のR1として光吸収基である単環式又は縮合多環式芳香族炭化水素基を有する珪素化合物を含む請求項1乃至5のいずれか1項記載の組成物。
- 単環式又は縮合多環式芳香族炭化水素基が、ベンゼン環、ナフタレン環又はアントラセン環を有する基である請求項6記載の組成物。
- リソグラフィーにより基板にパターンを形成する方法であって、低誘電率材料膜が形成された基板上に請求項1乃至5のいずれか1項記載の組成物を塗布し、ベークして犠牲膜を形成し、該犠牲膜上に反射防止膜を形成し、次いでフォトレジスト膜材料を塗布し、プリベークしてフォトレジスト膜を形成し、該フォトレジスト膜のパターン回路領域を露光した後、現像液で現像して該フォトレジスト膜にレジストパターンを形成し、該レジストパターンをマスクにして上記反射防止膜、上記犠牲膜、及び低誘電率材料膜をエッチングし、次いでストリップ液で犠牲膜を溶解除去して基板にパターンを形成することを含んでなるパターン形成方法。
- リソグラフィーにより基板にパターンを形成する方法であって、低誘電率材料膜が形成された基板上に請求項1乃至5のいずれか1項記載の組成物を塗布し、ベークして犠牲膜を形成し、該犠牲膜上に反射防止膜を形成し、次いでフォトレジスト膜材料を塗布し、プリベークしてフォトレジスト膜を形成し、該フォトレジスト膜のパターン回路領域を露光した後、現像液で現像して該フォトレジスト膜にレジストパターンを形成し、該レジストパターンをマスクにして上記反射防止膜、上記犠牲膜、及び低誘電率材料膜をエッチングし、更にプラズマ処理した後、ストリップ液で犠牲膜を溶解除去して基板にパターンを形成することを含んでなるパターン形成方法。
- リソグラフィーにより基板にパターンを形成する方法であって、低誘電率材料膜が形成された基板上に請求項6又は7記載の組成物を塗布し、ベークして犠牲膜を形成し、該犠牲膜上にフォトレジスト膜材料を塗布し、プリベークしてフォトレジスト膜を形成し、該フォトレジスト膜のパターン回路領域を露光した後、現像液で現像して該フォトレジスト膜にレジストパターンを形成し、該レジストパターンをマスクにして上記犠牲膜、及び低誘電率材料膜をエッチングし、次いでストリップ液で犠牲膜を溶解除去して基板にパターンを形成することを含んでなるパターン形成方法。
- リソグラフィーにより基板にパターンを形成する方法であって、低誘電率材料膜が形成された基板上に請求項6又は7記載の組成物を塗布し、ベークして犠牲膜を形成し、該犠牲膜上にフォトレジスト膜材料を塗布し、プリベークしてフォトレジスト膜を形成し、該フォトレジスト膜のパターン回路領域を露光した後、現像液で現像して該フォトレジスト膜にレジストパターンを形成し、該レジストパターンをマスクにして上記犠牲膜、及び低誘電率材料膜をエッチングし、更にプラズマ処理した後、ストリップ液で犠牲膜を溶解除去して基板にパターンを形成することを含んでなるパターン形成方法。
- 請求項1乃至7のいずれか1項記載の多孔質膜形成用組成物を基板上に塗布し、ベークして得られる多孔質犠牲膜。
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JP4430986B2 (ja) | 2003-06-03 | 2010-03-10 | 信越化学工業株式会社 | 反射防止膜材料、これを用いた反射防止膜及びパターン形成方法 |
US7202013B2 (en) | 2003-06-03 | 2007-04-10 | Shin-Etsu Chemical Co., Ltd. | Antireflective film material, and antireflective film and pattern formation method using the same |
US7303785B2 (en) * | 2003-06-03 | 2007-12-04 | Shin-Etsu Chemical Co., Ltd. | Antireflective film material, and antireflective film and pattern formation method using the same |
-
2004
- 2004-06-10 JP JP2004172236A patent/JP4553113B2/ja not_active Expired - Lifetime
-
2005
- 2005-06-09 TW TW094119108A patent/TW200604746A/zh unknown
- 2005-06-09 KR KR1020050049153A patent/KR20060048295A/ko not_active Ceased
- 2005-06-09 US US11/148,371 patent/US7417104B2/en active Active
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JP2001287910A (ja) * | 2000-04-04 | 2001-10-16 | Asahi Kasei Corp | 多孔質ケイ素酸化物塗膜の製造方法 |
JP2002030249A (ja) * | 2000-07-14 | 2002-01-31 | Catalysts & Chem Ind Co Ltd | 低誘電率シリカ系被膜形成用塗布液および低誘電率シリカ系被膜付基板 |
JP2003273098A (ja) * | 2002-03-19 | 2003-09-26 | Fujitsu Ltd | 低誘電率膜形成用組成物、低誘電率膜及びその製造方法、並びに半導体装置 |
WO2003089992A1 (en) * | 2002-04-16 | 2003-10-30 | International Business Machines Corporation | Antireflective sio-containing compositions for hardmask layer |
JP2004088042A (ja) * | 2002-06-26 | 2004-03-18 | Tokyo Electron Ltd | デバイス用溝構造体の製造方法 |
Also Published As
Publication number | Publication date |
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US7417104B2 (en) | 2008-08-26 |
US20050277756A1 (en) | 2005-12-15 |
JP2005350558A (ja) | 2005-12-22 |
TW200604746A (en) | 2006-02-01 |
KR20060048295A (ko) | 2006-05-18 |
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