JP4533744B2 - 反射防止膜用湿式現像性ポリマーバインダーとしてのスピン・ボウル適合性ポリアミック酸/イミド - Google Patents
反射防止膜用湿式現像性ポリマーバインダーとしてのスピン・ボウル適合性ポリアミック酸/イミド Download PDFInfo
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Description
発明の技術分野
本発明は、新規なポリマーおよびマイクロ電子デバイスの製造に使用するための反射防止組成物に関する。この組成物は、ポリアミック酸を含有し、水性フォトレジスト現像液中での現像が可能である。
集積回路製造では、歩留まりを改善し、ユニットケースを減らし、かつチップあたりの演算処理能力を向上させるために、基板ウエハサイズの最大化と、デバイスパターン像のサイズの最小化とが恒常的に求められている。シリコンまたは他のチップ上のデバイスパターン像のサイズは、高度化した遠紫外線(DUV)マイクロリソグラフィプロセスの出現により、いまやサブミクロンレベルである。
実施例
以下の実施例は本発明に係る好ましい方法を説明するものである。しかしながら、これら実施例は説明のためのものであって、これにより本発明全体の範囲をなんら限定するべきではないと理解されるべきである。
1. ポリマー調製
4,4'-ジアミノジフェニルスルホン(4,4'-DPS)、3,3'-ジヒドロキシベンジデン(HAB)および4,4'-ヘキサフルオロイソプロピリデンジフタル酸二無水物(6FDA)(それぞれクリスキュウ(KrisKev)社より入手)を、0.46:0.46:1のモル比で結合させることによりポリアミック酸を製造した。これら成分は、ジアセトンアルコール(アルドリッチより入手)中、60℃で結合させた。混合物を一晩撹拌し、こげ茶色で、固形分含量10重量%の粘性液が得られた。
表1に示す各成分を混合し、反射防止膜用組成物を得た。
a 組成物中の全成分の合計重量を100重量%をする
b プロピレングリコールメチルエーテルアセタート
c MY720,アラルダイトより入手した4官能エポキシ樹脂,50重量%のジアセトンアルコール希釈液
1.GPC分析
上記実施例のパート1で調製されたポリマーを、ゲルパーミエーションカラムを備え、n-メチルピリリドンとともにテトラヒドロフランを移動相として用いるHPLCを用いて分析し、分子量を測定した。実施例1のパート1で調製したポリマーの重量分子量は24,908であり、数分子量は13,462であった。
実施例1のパート2で調製された各組成物に、スピン・ボウル/溶媒適合性試験を課した。この試験は、各サンプルにつき5枚の4インチシリコンウェハに、組成物をスピンコーティングして行われた。スピンコーティング後、得られた膜を環境温度で24時間乾燥した。この時、Stokes(ストークス)エリプソメータを用いて、各ウェハの平均初期膜厚を測定した。厚み測定後、各ウェハを種々の溶媒(アセトン、乳酸エチル、PGMEA、プロピレングリコールメチルエーテル(PGME)および2-ヘプタノン)に、180秒間浸漬し、次いで3500rpmでスピン乾燥した。その後、再びStokesエリプソメータを用いて、それぞれの平均最終膜厚を測定した。各サンプルの平均最終膜厚値は、反射防止膜が各溶媒で100%除去されたことを示した。
実施例1のパート2で調製された反射防止膜用組成物について、典型的なフォトレジスト溶媒と下層の反射防止膜との間での相互作用の度合を分析するために、膜溶出試験を課した。この試験では、4インチシリコンウェハを、所定の反射防止膜組成物で被覆した後、130℃で30秒間焼成し、150℃で60秒間第2焼成した。次いで、Stokesエリプソメータを用いて膜厚を測定した。膜厚を測定した後、ウェハに乳酸エチルを噴霧した。ウェハ上の液滴を10秒後そのままにした後、ウエハを3500rpmで20秒間スピン乾燥した。その後、ウェハを再びStokesエリプソメータで測定し、膜厚を求めた。溶出量は、初期および最終の膜厚測定値の差である。溶出率%は、下記式で示される。
この分析では、4インチシリコンウェハに、実施例1のパート2で得られる組成物をそれぞれ別個にコーティングした。変角分光エリプソメトリにより、それぞれの屈折率(すなわち、n値)および屈折率虚数成分(すなわち、k値)を求めた。各組成物は、248nmにおいて、n値1.1、k値0.45を示した。
厚み40nmの膜を得るために、実施例1のパート2の組成物を、それぞれ8インチのシリコン基板上に、3500rpmで60秒間スピンコートした。その後、膜を130℃で30秒間焼成し、175℃で60秒間焼成した。各反射防止膜層上に、市販の500nmフォトレジスト(SEPR430,信越化学工業(Shinetsu))をスピンコートした後、90℃で軽く焼成した。次いで、外部シグマ0.87および内部シグマ0.57の環状照明およびNANA0.63のASML5500/300ステッパーを用い、フォトレジストを、ラインおよびスペースでパターン化した。KrFエキシマレーザーを26mj/cm2照射した後、110℃で90秒間焼成した。その後、フォトレジストおよび反射防止膜を、0.26N水酸化テトラメチルアンモニウム水性現像液(商品名OPD262の市販品)で現像した。サンプルウェハの1つの断面観察を図3に示す。
Claims (20)
- 溶媒系に溶解または分散したポリマーを含む、反射防止膜用組成物であって、組成物が熱架橋剤を含み、かつ、該ポリマーが、
各Rは、それぞれ独立に、-OH、-NH2、水素、脂肪族およびフェニルからなる群より選ばれ、(I)の各環上のRの少なくとも1つは、-NH2であり;かつ
Lは、-SO2-および-CR'2-からなる群より選ばれ、ここでの各R'は、それぞれ独立に、水素、脂肪族、フェニルおよび-CX3からなる群より選ばれ、ここでの各Xは、それぞれ独立にハロゲンからなる群より選ばれる。)
で示される化合物とのコポリマーであることを改良点とし、かつ
40nmの厚みにおいて、248nmの波長でのk値は少なくとも0.3であり、n値が1.0である膜を形成することができる組成物。 - Lが、-SO2-である請求項1に記載の組成物。
- Lが、-CR'2-である請求項1に記載の組成物。
- 各R'が、-CF3である請求項3に記載の組成物。
- 表面を有する基板と、前記表面に隣接した下記硬化した反射防止膜との積層体:
熱架橋剤、および、溶媒系に溶解または分散したポリマーを含む組成物から形成される反射防止膜であって、該ポリマーが、
各Rは、それぞれ独立に、-OH、-NH2、水素、脂肪族およびフェニルからなる群より選ばれ、(I)の各環上のRの少なくとも1つは、-NH2であり;かつ
Lは、-SO2-および-CR'2-からなる群より選ばれ、ここでの各R'は、それぞれ独立に、水素、脂肪族、フェニルおよび-CX3からなる群より選ばれ、ここでの各Xは、それぞれ独立にハロゲンからなる群より選ばれる。)
40nmの厚みにおいて、248nmの波長でのk値は少なくとも0.3であり、n値が1.0である反射防止膜。 - 前記硬化膜が、湿式現像性である請求項5に記載の積層体。
- 前記硬化膜が、プロピレングリコールメチルエーテルアセタートを溶媒とする時の溶解度パーセントが少なくとも50%である請求項5に記載の積層体。
- 前記基板が、シリコンウェハおよびイオン注入膜からなる群より選ばれる請求項5に記載の積層体。
- 前記積層体が、前記硬化膜に隣接したフォトレジスト膜をさらに含む請求項5に記載の積層体。
- 前記硬化膜が、塩基性現像剤に少なくとも90%溶解しうる請求項5に記載の積層体。
- Lが、-SO2-である請求項5に記載の積層体。
- Lが、-CR'2-である請求項5に記載の積層体。
- 各R'が、-CF3である請求項12に記載の積層体。
- 反射防止膜用組成物の使用方法であって、該方法が基板に所定量の組成物を塗布して、前記組成物を加熱して架橋を進行させ、硬化膜を形成させることを含み、前記組成物は熱架橋剤と溶媒系に溶解または分散したポリマーを含み、該ポリマーは、
各Rは、それぞれ独立に、-OH、-NH2、水素、脂肪族およびフェニルからなる群より選ばれ、(I)の各環上のRの少なくとも1つは、-NH2であり;かつ
Lは、-SO2-および-CR'2-からなる群より選ばれ、ここでの各R'は、それぞれ独立に、水素、脂肪族、フェニルおよび-CX3からなる群より選ばれ、ここでの各Xは、それぞれ独立にハロゲンからなる群より選ばれる。)
前記硬化膜は、40nmの厚みにおいて、248nmの波長でのk値は少なくとも0.3であり、n値が1.0である、組成物の使用方法。 - 前記塗布が、前記組成物を前記基板表面上にスピンコーティングすることを含む請求項14に記載の方法。
- 前記基板が、そこに形成されたホールを有し、該ホールが底部および側壁で形付けられ、前記塗布が、前記組成物を前記底部および側壁の少なくとも一部に塗布することを含む請求項14に記載の方法。
- 前記加熱が、100−250℃の温度で焼成することを含む、請求項14に記載の方法。
- 前記硬化膜にフォトレジストを塗布する工程をさらに含む請求項17に記載の方法。
- 下記工程をさらに含む請求項18に記載の方法:
前記フォトレジストの少なくとも一部を活性化光線に露光する工程、および
露光したフォトレジストを現像する工程。 - 前記現像工程により、前記露光したフォトレジストに隣接する領域から前記硬化膜を除去する請求項19に記載の方法。
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US10/180,624 US7261997B2 (en) | 2002-01-17 | 2002-06-25 | Spin bowl compatible polyamic acids/imides as wet developable polymer binders for anti-reflective coatings |
PCT/US2003/019456 WO2004000928A2 (en) | 2002-06-25 | 2003-06-18 | Spin bowl compatible polyamic acids/imides as wet developable polymer binders for anti-reflective coatings |
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JP2005535740A JP2005535740A (ja) | 2005-11-24 |
JP4533744B2 true JP4533744B2 (ja) | 2010-09-01 |
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US (4) | US7261997B2 (ja) |
EP (1) | EP1540420B1 (ja) |
JP (1) | JP4533744B2 (ja) |
KR (2) | KR101019316B1 (ja) |
AU (1) | AU2003251582A1 (ja) |
TW (1) | TWI311996B (ja) |
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-
2002
- 2002-06-25 US US10/180,624 patent/US7261997B2/en not_active Expired - Lifetime
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2003
- 2003-06-06 TW TW092115341A patent/TWI311996B/zh not_active IP Right Cessation
- 2003-06-18 JP JP2004515999A patent/JP4533744B2/ja not_active Expired - Lifetime
- 2003-06-18 WO PCT/US2003/019456 patent/WO2004000928A2/en active Application Filing
- 2003-06-18 KR KR1020047021013A patent/KR101019316B1/ko active IP Right Grant
- 2003-06-18 EP EP03761169.6A patent/EP1540420B1/en not_active Expired - Lifetime
- 2003-06-18 KR KR1020107019798A patent/KR20100111744A/ko not_active Application Discontinuation
- 2003-06-18 AU AU2003251582A patent/AU2003251582A1/en not_active Abandoned
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- 2004-05-11 US US10/842,997 patent/US20040210034A1/en not_active Abandoned
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TW200409791A (en) | 2004-06-16 |
AU2003251582A8 (en) | 2004-01-06 |
WO2004000928A3 (en) | 2004-08-26 |
AU2003251582A1 (en) | 2004-01-06 |
US20060063106A1 (en) | 2006-03-23 |
EP1540420A4 (en) | 2010-09-15 |
EP1540420A2 (en) | 2005-06-15 |
TWI311996B (en) | 2009-07-11 |
US7608380B2 (en) | 2009-10-27 |
US20040210034A1 (en) | 2004-10-21 |
KR20050024381A (ko) | 2005-03-10 |
KR101019316B1 (ko) | 2011-03-07 |
US7261997B2 (en) | 2007-08-28 |
JP2005535740A (ja) | 2005-11-24 |
US20030166828A1 (en) | 2003-09-04 |
KR20100111744A (ko) | 2010-10-15 |
WO2004000928A2 (en) | 2003-12-31 |
EP1540420B1 (en) | 2013-09-04 |
US20100040988A1 (en) | 2010-02-18 |
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