JP2021196467A - レジスト下層膜材料、パターン形成方法、及びレジスト下層膜形成方法 - Google Patents
レジスト下層膜材料、パターン形成方法、及びレジスト下層膜形成方法 Download PDFInfo
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- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 description 1
- ARCGXLSVLAOJQL-UHFFFAOYSA-N trimellitic acid Chemical class OC(=O)C1=CC=C(C(O)=O)C(C(O)=O)=C1 ARCGXLSVLAOJQL-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 238000010626 work up procedure Methods 0.000 description 1
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Abstract
Description
(A)下記一般式(1)で示される化合物の一種又は二種以上、及び、
(B)有機溶剤
を含むものであるレジスト下層膜材料を提供する。
(I−1)被加工基板上に、上記のレジスト下層膜材料を塗布後、熱処理することによりレジスト下層膜を形成する工程、
(I−2)前記レジスト下層膜上に、フォトレジスト材料を用いてレジスト上層膜を形成する工程、
(I−3)前記レジスト上層膜をパターン露光した後、現像液で現像して、前記レジスト上層膜にパターンを形成する工程、
(I−4)前記パターンが形成されたレジスト上層膜をマスクにして、ドライエッチングで前記レジスト下層膜にパターンを転写する工程、及び
(I−5)前記パターンが形成されたレジスト下層膜をマスクにして前記被加工基板を加工して前記被加工基板にパターンを形成する工程
を有するパターン形成方法を提供する。
(II−1)被加工基板上に、上記のレジスト下層膜材料を塗布後、熱処理することによりレジスト下層膜を形成する工程、
(II−2)前記レジスト下層膜上に、レジスト中間膜を形成する工程、
(II−3)前記レジスト中間膜上に、フォトレジスト材料を用いてレジスト上層膜を形成する工程、
(II−4)前記レジスト上層膜をパターン露光した後、現像液で現像して、前記レジスト上層膜にパターンを形成する工程、
(II−5)前記パターンが形成されたレジスト上層膜をマスクにして、ドライエッチングで前記レジスト中間膜にパターンを転写する工程、
(II−6)前記パターンが転写されたレジスト中間膜をマスクにして、ドライエッチングで前記レジスト下層膜にパターンを転写する工程、及び
(II−7)前記パターンが形成されたレジスト下層膜をマスクにして前記被加工基板を加工して前記被加工基板にパターンを形成する工程
を有するパターン形成方法を提供する。
(III−1)被加工基板上に、上記のレジスト下層膜材料を塗布後、熱処理することによりレジスト下層膜を形成する工程、
(III−2)前記レジスト下層膜上に、ケイ素酸化膜、ケイ素窒化膜、及びケイ素酸化窒化膜から選ばれる無機ハードマスク中間膜を形成する工程、
(III−3)前記無機ハードマスク中間膜上に、有機薄膜を形成する工程、
(III−4)前記有機薄膜上に、フォトレジスト材料を用いてレジスト上層膜を形成する工程、
(III−5)前記レジスト上層膜をパターン露光した後、現像液で現像して、前記レジスト上層膜にパターンを形成する工程、
(III−6)前記パターンが形成されたレジスト上層膜をマスクにして、ドライエッチングで前記有機薄膜及び前記無機ハードマスク中間膜にパターンを転写する工程、
(III−7)前記パターンが転写された無機ハードマスク中間膜をマスクにして、ドライエッチングで前記レジスト下層膜にパターンを転写する工程、及び
(III−8)前記パターンが形成されたレジスト下層膜をマスクにして前記被加工基板を加工して前記被加工基板にパターンを形成する工程
を有するパターン形成方法を提供する。
(A)下記一般式(1)で示される化合物の一種又は二種以上、及び、
(B)有機溶剤
を含むものである。
本発明のレジスト下層膜材料は、上記のように多層レジスト法に用いられるレジスト下層膜材料であって、
(A)下記一般式(1)で示される化合物の一種又は二種以上、及び、
(B)有機溶剤
を含むものである。
また、本発明では、被加工基板にパターンを形成する方法であって、
(I−1)被加工基板上に、上記のレジスト下層膜材料を塗布後、熱処理することによりレジスト下層膜を形成する工程、
(I−2)前記レジスト下層膜上に、フォトレジスト材料を用いてレジスト上層膜を形成する工程、
(I−3)前記レジスト上層膜をパターン露光した後、現像液で現像して、前記レジスト上層膜にパターンを形成する工程、
(I−4)前記パターンが形成されたレジスト上層膜をマスクにして、ドライエッチングで前記レジスト下層膜にパターンを転写する工程、及び
(I−5)前記パターンが形成されたレジスト下層膜をマスクにして前記被加工基板を加工して前記被加工基板にパターンを形成する工程
を有するパターン形成方法を提供する(2層レジストプロセス)。
(II−1)被加工基板上に、上記のレジスト下層膜材料を塗布後、熱処理することによりレジスト下層膜を形成する工程、
(II−2)前記レジスト下層膜上に、レジスト中間膜を形成する工程、
(II−3)前記レジスト中間膜上に、フォトレジスト材料を用いてレジスト上層膜を形成する工程、
(II−4)前記レジスト上層膜をパターン露光した後、現像液で現像して、前記レジスト上層膜にパターンを形成する工程、
(II−5)前記パターンが形成されたレジスト上層膜をマスクにして、ドライエッチングで前記レジスト中間膜にパターンを転写する工程、
(II−6)前記パターンが転写されたレジスト中間膜をマスクにして、ドライエッチングで前記レジスト下層膜にパターンを転写する工程、及び
(II−7)前記パターンが形成されたレジスト下層膜をマスクにして前記被加工基板を加工して前記被加工基板にパターンを形成する工程
を有するパターン形成方法を提供する(3層レジストプロセス)。
(III−1)被加工基板上に、上記のレジスト下層膜材料を塗布後、熱処理することによりレジスト下層膜を形成する工程、
(III−2)前記レジスト下層膜上に、ケイ素酸化膜、ケイ素窒化膜、及びケイ素酸化窒化膜から選ばれる無機ハードマスク中間膜を形成する工程、
(III−3)前記無機ハードマスク中間膜上に、有機薄膜を形成する工程、
(III−4)前記有機薄膜上に、フォトレジスト材料を用いてレジスト上層膜を形成する工程、
(III−5)前記レジスト上層膜をパターン露光した後、現像液で現像して、前記レジスト上層膜にパターンを形成する工程、
(III−6)前記パターンが形成されたレジスト上層膜をマスクにして、ドライエッチングで前記有機薄膜及び前記無機ハードマスク中間膜にパターンを転写する工程、及び
(III−7)前記パターンが転写された無機ハードマスク中間膜をマスクにして、ドライエッチングで前記レジスト下層膜にパターンを転写する工程、
(III−8)前記パターンが形成されたレジスト下層膜をマスクにして前記被加工基板を加工して前記被加工基板にパターンを形成する工程
を有するパターン形成方法を提供する(4層レジストプロセス)。
本発明のパターン形成方法について、以下に3層レジストプロセスを例に挙げて説明するが該プロセスに限定されない。この場合、基板上に上記のレジスト下層膜材料を用いてレジスト下層膜を形成し、該レジスト下層膜上にケイ素原子を含有するレジスト中間層膜材料を用いてレジスト中間層膜を形成し、該レジスト中間層膜より上にフォトレジスト組成物のレジスト上層膜材料を用いてレジスト上層膜を形成して多層レジスト膜とし、上記レジスト上層膜のパターン回路領域を露光した後、現像液で現像してレジスト上層膜にレジストパターンを形成し、該パターンが形成されたレジスト上層膜をマスクにしてレジスト中間層膜をエッチングし、パターンが形成されたレジスト中間層膜をマスクにしてレジスト下層膜をエッチングし、さらに、パターンが形成されたレジスト下層膜をマスクにして基板を加工して基板にパターンを形成することができる。
また、本発明は、有機薄膜を用いた4層レジストプロセスにも好適に用いることができ、この場合、少なくとも、基板上に上記レジスト下層膜材料を用いてレジスト下層膜を形成し、該レジスト下層膜の上にケイ素酸化膜、ケイ素窒化膜及びケイ素酸化窒化膜から選ばれる無機ハードマスク中間膜を形成し、該無機ハードマスク中間膜の上に有機薄膜を形成し、該有機薄膜の上にフォトレジスト組成物からなるレジスト上層膜材料を用いてレジスト上層膜を形成して、上記レジスト上層膜のパターン回路領域を露光した後、現像液で現像して上記レジスト上層膜にレジストパターンを形成し、得られたレジストパターンをエッチングマスクにして上記有機薄膜と前記無機ハードマスク中間膜をエッチングし、得られた無機ハードマスク中間膜パターンをエッチングマスクにして上記レジスト下層膜をエッチングし、得られたレジスト下層膜パターンをマスクにして基板を加工して基板にパターンを形成することができる。
本発明では、半導体装置の製造工程で使用される有機平坦膜として機能するレジスト下層膜の形成方法であって、被加工基板上に上記のレジスト下層膜材料を回転塗布し、該レジスト下層膜材料を塗布した基板を100℃以上600℃以下の温度で10〜600秒間の範囲で熱処理することにより硬化膜を形成するレジスト下層膜形成方法を提供する。
上記の化合物(A1)〜(A8)、(R1)〜(R8)、添加剤として架橋剤(E1)、高沸点溶剤として(S1)1,6−ジアセトキシヘキサン(沸点260℃)または(S2)トリプロピレングリコールモノメチルエーテル(沸点242℃)を、PGMEA、FC−4430(住友スリーエム(株)製)0.1質量%を含む溶媒中に表2に示す割合で溶解させ、0.1μmのフッ素樹脂製のフィルターで濾過することによってレジスト下層膜材料(UL−1〜12、比較UL−1〜13)を調製した。
上記で調製したレジスト下層膜材料(UL−1〜12、比較UL−1〜13)をシリコン基板上に塗布し、250℃で60秒焼成した後、膜厚を測定し、その上にPGMEA溶剤をディスペンスし、30秒間放置しスピンドライ、100℃で60秒間ベークしてPGMEA溶媒を蒸発させ、膜厚を再度測定しPGMEA処理前後の膜厚差を求めることにより溶剤耐性を評価した。結果を下表に示す。
上記で調製したレジスト下層膜材料(UL−1〜12、比較UL−1〜3、9〜13)をそれぞれシリコン基板上に塗布し、250℃で60秒間焼成して膜厚100nmのレジスト下層膜を形成し、下層膜の成膜状態を評価した。結果を下表に示す。なお、本評価では、塗布性の優劣を評価するために膜厚を薄くしており、はじきが発生しやすい厳しい評価条件となっている。
上記で調製したレジスト下層膜材料(UL−1〜12、比較UL−1〜3、9〜13)をそれぞれ、密集ホールパターン(ホール直径0.16μm、ホール深さ0.50μm、隣り合う二つのホールの中心間の距離0.32μm)を有するSiO2ウエハー基板上に塗布し、250℃で60秒焼成し、レジスト下層膜を形成した。使用した基板は図2(G)(俯瞰図)及び(H)(断面図)に示すような密集ホールパターンを有する下地基板7(SiO2ウエハー基板)である。得られた各ウエハー基板の断面形状を、走査型電子顕微鏡(SEM)を用いて観察し、ホール内部にボイド(空隙)なく、レジスト下層膜8で充填されているかどうかを確認した。結果を下表に示す。埋め込み特性に劣るレジスト下層膜材料を用いた場合は、本評価において、ホール内部にボイドが発生する。埋め込み特性が良好なレジスト下層膜材料を用いた場合は、本評価において、図2(I)に示されるようにホール内部にボイドなくレジスト下層膜が充填される。
上記で調製したレジスト下層膜材料(UL−1〜12、比較UL−1〜3、9〜13)をそれぞれ、巨大孤立トレンチパターン(図3(J)、トレンチ幅10μm、トレンチ深さ0.1μm)を有する下地基板9(SiO2ウエハー基板)上に塗布し、250℃で60秒焼成し、トレンチ部分と非トレンチ部分のレジスト下層膜10の段差(図3(K)中のdelta 10)を、パークシステムズ社製NX10原子間力顕微鏡(AFM)を用いて観察した。結果を下表に示す。本評価において、段差が小さいほど、平坦化特性が良好であるといえる。なお、本評価では、深さ0.10μmのトレンチパターンを、通常膜厚約0.2μmの有機膜材料を用いて平坦化しており、平坦化特性の優劣を評価するために厳しい評価条件となっている。
上記で調製したレジスト下層膜材料(UL−1〜12、比較UL−1〜3、9〜13)をそれぞれ、トレンチパターン(トレンチ幅10μm、トレンチ深さ0.10μm)を有するSiO2ウエハー基板上に塗布し、大気中、Bare Si基板上で膜厚200nmになるように250℃で60秒焼成し、レジスト下層膜を形成した。その上にケイ素含有レジスト中間層材料(SOG−1)を塗布して220℃で60秒間ベークして膜厚35nmのレジスト中間層膜を形成し、レジスト上層膜材料(ArF用SLレジスト)を塗布し、105℃で60秒間ベークして膜厚100nmのレジスト上層膜を形成した。レジスト上層膜に液浸保護膜(TC−1)を塗布し90℃で60秒間ベークし膜厚50nmの保護膜を形成した。
チャンバー圧力 10.0Pa
RFパワー 1,500W
CF4ガス流量 15sccm
O2ガス流量 75sccm
時間 15sec
チャンバー圧力 2.0Pa
RFパワー 500W
Arガス流量 75sccm
O2ガス流量 45sccm
時間 120sec
チャンバー圧力 2.0Pa
RFパワー 2,200W
C5F12ガス流量 20sccm
C2F6ガス流量 10sccm
Arガス流量 300sccm
O2ガス流量 60sccm
時間 90sec
Claims (16)
- 多層レジスト法に用いられるレジスト下層膜材料であって、
(A)下記一般式(1)で示される化合物の一種又は二種以上、及び、
(B)有機溶剤
を含むものであることを特徴とするレジスト下層膜材料。
- 前記一般式(2)中のAが−OCH2−であることを特徴とする請求項1に記載のレジスト下層膜材料。
- 前記(B)有機溶剤が、沸点が180度未満の有機溶剤1種以上と、沸点180度以上の有機溶剤1種以上との混合物であることを特徴とする請求項1から請求項5のいずれか一項に記載のレジスト下層膜材料。
- 更に(C)酸発生剤、(D)界面活性剤、(E)架橋剤、(F)可塑剤、及び(G)色素のうち1種以上を含有するものであることを特徴とする請求項1から請求項6のいずれか一項に記載のレジスト下層膜材料。
- 被加工基板にパターンを形成する方法であって、
(I−1)被加工基板上に、請求項1から請求項8のいずれか一項に記載のレジスト下層膜材料を塗布後、熱処理することによりレジスト下層膜を形成する工程、
(I−2)前記レジスト下層膜上に、フォトレジスト材料を用いてレジスト上層膜を形成する工程、
(I−3)前記レジスト上層膜をパターン露光した後、現像液で現像して、前記レジスト上層膜にパターンを形成する工程、
(I−4)前記パターンが形成されたレジスト上層膜をマスクにして、ドライエッチングで前記レジスト下層膜にパターンを転写する工程、及び
(I−5)前記パターンが形成されたレジスト下層膜をマスクにして前記被加工基板を加工して前記被加工基板にパターンを形成する工程
を有することを特徴とするパターン形成方法。 - 被加工基板にパターンを形成する方法であって、
(II−1)被加工基板上に、請求項1から請求項8のいずれか一項に記載のレジスト下層膜材料を塗布後、熱処理することによりレジスト下層膜を形成する工程、
(II−2)前記レジスト下層膜上に、レジスト中間膜を形成する工程、
(II−3)前記レジスト中間膜上に、フォトレジスト材料を用いてレジスト上層膜を形成する工程、
(II−4)前記レジスト上層膜をパターン露光した後、現像液で現像して、前記レジスト上層膜にパターンを形成する工程、
(II−5)前記パターンが形成されたレジスト上層膜をマスクにして、ドライエッチングで前記レジスト中間膜にパターンを転写する工程、
(II−6)前記パターンが転写されたレジスト中間膜をマスクにして、ドライエッチングで前記レジスト下層膜にパターンを転写する工程、及び
(II−7)前記パターンが形成されたレジスト下層膜をマスクにして前記被加工基板を加工して前記被加工基板にパターンを形成する工程
を有することを特徴とするパターン形成方法。 - 被加工基板にパターンを形成する方法であって、
(III−1)被加工基板上に、請求項1から請求項8のいずれか一項に記載のレジスト下層膜材料を塗布後、熱処理することによりレジスト下層膜を形成する工程、
(III−2)前記レジスト下層膜上に、ケイ素酸化膜、ケイ素窒化膜、及びケイ素酸化窒化膜から選ばれる無機ハードマスク中間膜を形成する工程、
(III−3)前記無機ハードマスク中間膜上に、有機薄膜を形成する工程、
(III−4)前記有機薄膜上に、フォトレジスト材料を用いてレジスト上層膜を形成する工程、
(III−5)前記レジスト上層膜をパターン露光した後、現像液で現像して、前記レジスト上層膜にパターンを形成する工程、
(III−6)前記パターンが形成されたレジスト上層膜をマスクにして、ドライエッチングで前記有機薄膜及び前記無機ハードマスク中間膜にパターンを転写する工程、
(III−7)前記パターンが転写された無機ハードマスク中間膜をマスクにして、ドライエッチングで前記レジスト下層膜にパターンを転写する工程、及び
(III−8)前記パターンが形成されたレジスト下層膜をマスクにして前記被加工基板を加工して前記被加工基板にパターンを形成する工程
を有することを特徴とするパターン形成方法。 - 前記被加工基板として、高さ30nm以上の構造体又は段差を有する基板を用いることを特徴とする請求項9から請求項11のいずれか一項に記載のパターン形成方法。
- 半導体装置の製造工程で使用される有機平坦膜として機能するレジスト下層膜の形成方法であって、被加工基板上に請求項1から請求項8のいずれか一項に記載のレジスト下層膜材料を回転塗布し、該レジスト下層膜材料を塗布した基板を100℃以上600℃以下の温度で10〜600秒間の範囲で熱処理することにより硬化膜を形成することを特徴とするレジスト下層膜形成方法。
- 半導体装置の製造工程で使用される有機平坦膜として機能するレジスト下層膜の形成方法であって、被加工基板上に請求項1から請求項8のいずれか一項に記載のレジスト下層膜材料を回転塗布し、該レジスト下層膜材料を塗布した基板を酸素濃度1%以上21%以下の雰囲気で熱処理することにより硬化膜を形成することを特徴とするレジスト下層膜形成方法。
- 半導体装置の製造工程で使用される有機平坦膜として機能するレジスト下層膜の形成方法であって、被加工基板上に請求項1から請求項8のいずれか一項に記載のレジスト下層膜材料を回転塗布し、該レジスト下層膜材料を塗布した基板を酸素濃度1%未満の雰囲気で熱処理することにより硬化膜を形成することを特徴とするレジスト下層膜形成方法。
- 前記被加工基板として、高さ30nm以上の構造体又は段差を有する基板を用いることを特徴とする請求項13から請求項15のいずれか一項に記載のレジスト下層膜形成方法。
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CN113805434B (zh) | 2024-04-23 |
KR102493736B1 (ko) | 2023-01-31 |
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JP7368322B2 (ja) | 2023-10-24 |
EP3923074B1 (en) | 2023-02-22 |
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