JP2019082682A - フォトレジストと共に使用するための下地コーティング組成物 - Google Patents
フォトレジストと共に使用するための下地コーティング組成物 Download PDFInfo
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Abstract
Description
1つの好ましい態様では、コーティング組成物またはコーティング組成物層は、リソグラフィ技術において反射率制御及びフォトレジスト膜と基板との間の界面接着改善のための重要な下層の1つであることが知られている、193nm有機底部反射防止コーティング(BARC)を形成することができる。最近では、マイクロスケールパターニングのためのフォトレジスト(PR)の限界寸法が縮小されるにつれて、より悪いPRアスペクト比によって生じる物理的パターンの崩壊を改善するためにPR厚さが減少し、したがって、低減したPR厚さでエッチング選択性を改善し、低速E/Rによるエッチングバイアスを最小化する、より速いエッチング速度(E/R)性能のために、ハードマスクとしての有機BARCが必要となっている。
下地コーティング組成物と共に使用するためのフォトレジストは、典型的には、ポリマー及び1つ以上の酸発生剤を含む。一般に好ましいのはポジ型レジストであり、レジストポリマーはレジスト組成物にアルカリ性の水溶性を付与する官能基を有する。例えば、ヒドロキシルまたはカルボキシレートのような極性官能基、またはリソグラフィ処理の際にそのような極性部分を遊離させ得る酸不安定基を含むポリマーが好ましい。好ましくは、ポリマーは、レジストをアルカリ性水溶液で現像可能にするのに十分な量でレジスト組成物に使用される。
使用において、本発明のコーティング組成物は、スピンコーティングなどの様々な方法のいずれかによって基板にコーティング層として塗布される。一般に、コーティング組成物は、約0.02〜0.5μmの乾燥層厚、好ましくは約0.04〜0.20μmの、乾燥層厚で基板上に塗布される。基板は、フォトレジストを含むプロセスで使用される任意の基板であることが適切である。例えば、基板は、ケイ素、二酸化ケイ素、またはアルミニウム−酸化アルミニウムマイクロエレクトロニクスウエハであってもよい。ガリウム砒素、炭化珪素、セラミック、石英、または銅基板を使用することもできる。液晶ディスプレイまたは他のフラットパネルディスプレイ用途のための基板、例えばガラス基板、酸化インジウムスズコーティングされた基板なども好適に使用される。光学及び光学電子デバイス(例えば、導波管)のための基板もまた使用することができる。
実施例1:ポリマー合成
実施例5
上記実施例1で製造したポリマー0.947gと、2,4,6−トリメチルピリジニウムp−トルエンスルホネート塩0.013gとを、2−ヒドロキシイソ酪酸メチルエステル(HBM)溶媒99.0gに溶解してコーティング組成物を得た。
実施例2で製造したポリマー0.947gと、2,4,6−トリメチルピリジニウムp−トルエンスルホネート塩0.013gとを、HBM溶媒99.0gに溶解してコーティング組成物を得た。
実施例3で製造したポリマー0.947gと、2,4,6−トリメチルピリジニウムp−トルエンスルホネート塩0.013gとを、HBM溶媒99.0gに溶解してコーティング組成物を得た。
実施例4で製造したポリマー0.947gと、2,4,6−トリメチルピリジニウムp−トルエンスルホネート塩0.013gとを、HBM溶媒99.0gに溶解して組成物を得た。
以下の表1は、本発明の反射防止組成物を評価するために利用される例示的なプロセス条件である。
実施例10:リソグラフィ試験条件
以下の表2は、リソグラフィ評価のための例示的なプロセス及び照明条件を示す。
実施例5〜8の組成物を上記のように半導体ウェハ上にスピンコートした。
実施例5〜7の組成物及びポリマーは、大西パラメータ数と協働してより速いE/R性能を示し、特に実施例7は、実施例8(比較例)と類似のn/kで同等のEL/パターン崩壊マージン(PCM)及びDoFマージンを有する最速E/Rを示す。以下の表3は、CF4/Arガスによるエッチング速度の結果を示し、表4は、上記実施例5〜8の組成物のリソグラフィ性能の概要を示す。
Claims (15)
- フォトレジストレリーフ像を形成するための方法であって、
a)基板上に、
下記式(I):
であって、式中、R1、R2、及びR3が、各々独立して、水素または非水素置換基であり、R1、R2、及びR3のうちの少なくとも1つが、−(CXY)(C=O)O−Rであり、Rが、別のポリマー単位への結合であり、X及びYが、各々独立して、水素または非水素置換基である、式の構造を含む繰り返し単位を含む樹脂を含むコーティング組成物の層を塗布することと、
b)前記コーティング組成物層上にフォトレジスト組成物の層を塗布することと、を含む、方法。 - R1、R2、及びR3のうちの少なくとも1つが、−−CH2(C=O)O−Rであり、Rが、別のポリマー単位への結合である、請求項1に記載の方法。
- R1、R2、及びR3の各々が、水素以外である、請求項1または2に記載の方法。
- R1、R2、及びR3のうちの少なくとも2つが、−CH2(C=O)O−Rであり、Rが、別のポリマー単位への結合である、請求項1〜3のいずれか一項に記載の方法。
- R1、R2、及びR3のうちの少なくとも1つが、1)−CH2(C=O)O−R以外であり、2)1つ以上の酸素原子を含む、請求項1〜4のいずれか一項に記載の方法。
- 前記樹脂が、下記式(II):
であって、式中、Pが、水素または非水素置換基である、式(II)のモノマーの反応から得られる重合された基を含む、請求項1〜5のいずれか一項に記載の方法。 - 前記樹脂が、架橋剤単位をさらに含む、請求項1〜6のいずれか一項に記載の方法。
- 前記樹脂が、括弧内に示される以下の構造:
のうちの1つ以上を含み、各構造において、X−リンカーが、非水素置換基である、請求項1〜7のいずれか一項に記載の方法。 - X−リンカーが、架橋可能な部分である、請求項8に記載の方法。
- 前記ポリマーが、7以上の大西パラメータ値を有する、請求項1〜9のいずれか一項に記載の方法。
- 前記コーティング組成物が、前記樹脂とは異なる架橋剤成分をさらに含む、請求項1〜10のいずれか一項に記載の方法。
- 前記フォトレジスト組成物が、活性化放射線で画像化され、前記画像化されたフォトレジスト組成物層が現像されてフォトレジストレリーフ像を提供する、請求項1〜11のいずれか一項に記載の方法。
- 前記コーティング組成物層が、前記フォトレジスト組成物層を塗布する前に熱処理される、請求項1〜12のいずれか一項に記載の方法。
- コーティングされた基板であって、
a)
1)下記式(I):
であって、式中、R1、R2、及びR3が、各々独立して、水素または非水素置換基であり、R1、R2、及びR3のうちの少なくとも1つが、−CXY(C=O)O−Rであり、Rが、別のポリマー単位への結合であり、X及びYが、各々独立して、水素または非水素置換基である、式の構造を含む繰り返し単位を含む樹脂と、
2)置換イソシアヌレート化合物と、を含む、コーティング組成物と、
b)前記コーティング組成物層上のフォトレジスト組成物の層と、をその上に有する基板を含む、コーティングされた基板。 - オーバーコーティング用フォトレジスト組成物と共に使用するための反射防止コーティング組成物であって、
1)下記式(I):
であって、式中、R1、R2、及びR3が、各々独立して、水素または非水素置換基であり、R1、R2、及びR3のうちの少なくとも1つが、−(CXY)(C=O)O−Rであり、Rが、別のポリマー単位への結合であり、X及びYが、各々独立して、水素または非水素置換基である、式の構造を含む繰り返し単位を含む樹脂を含む、反射防止コーティング組成物。
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| CN109725492A (zh) | 2019-05-07 |
| KR102183782B1 (ko) | 2020-11-27 |
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