JP2014135517A - 高速自由形式ソース・マスク同時最適化方法 - Google Patents
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Abstract
【解決手段】本発明は、コスト関数の勾配の直接的な計算を可能にすることによって最適化の収束を著しく速める。他の態様において、本発明は、ソースとマスクの両方の同時最適化を可能にし、それによって全体的な収束を著しく速める。さらなる態様において、本発明は、従来の最適化技術が必要とする制約無しで自由形式最適化を可能にする。
【選択図】図3
Description
・プログラマブルミラーアレイ。このようなデバイスの一例は、粘弾性制御層と反射面を有するマトリクス・アドレス指定可能表面である。このような装置の基本原理は、(例えば)反射面のアドレスエリアが回折光として入射光を反射し、一方、非アドレスエリアが非回折光として入射光を反射することである。適切なフィルタを使用して反射ビームから前述の非回折光をフィルタで除去し、回折光のみを残すことができ、このように、ビームにはマトリクス・アドレス指定可能表面のアドレス指定パターンに応じてパターンが形成される。適切な電子手段を使用して、必要なマトリクス・アドレス指定を実行することができる。そのようなミラーアレイに関する詳細情報は、例えば、参照により本明細書に組み込まれる米国特許第5,296,891号および第5,523,193号から入手することができる。
・プログラマブルLCDアレイ。このような構造の一例は、参照により本明細書に組み込まれる米国特許第5,229,872号に示されている。
−投影ビームPBの放射を供給するための放射システムEx、IL(この特定の場合では、放射システムは放射源LAも含む)と、
−マスクMA(例えば、レチクル)を保持するためのマスクホルダが設けられ、かつアイテムPLに対してマスクを正確に位置決めするための第1位置決め手段に接続された第1オブジェクトテーブル(マスクテーブル)MTと、
−基板W(例えば、レジストコートシリコンウェーハ)を保持するための基板ホルダが設けられ、かつアイテムPLに対して基板を正確に位置決めするための第2位置決め手段に接続された第2オブジェクトテーブル(基板テーブル)WTと、
−マスクMAの照射部分を基板Wのターゲット部分C(例えば、1つ以上のダイを含む)上に結像するための投影システム(「レンズ」)PL(例えば、屈折、反射、または反射屈折光学システム)と、を備える。
−ステップモードにおいては、マスクテーブルMTを基本的に静止状態に保ちつつ、マスク像全体を一度に(すなわち、単一「フラッシュ」)ターゲット部分C上に投影する。その後、基板テーブルWTは、Xおよび/またはY方向に移動され、それによって別のターゲット部分CをビームPBによって照射することができる。
−スキャンモードにおいては、所与のターゲット部分Cが単一「フラッシュ」で露光されないことを除いて、基本的に同じシナリオが適用される。その代わりに、マスクテーブルMTは速度vで所与の方向(いわゆる「スキャン方向」、例えば、y方向)に移動可能であり、従って、投影ビームPBはマスク像上をスキャンすることになる。同時に、基板テーブルWTは速度V=Mvで同じ方向または反対方向に並行して移動し、MはレンズPLの倍率である(通常、M=1/4または1/5)。このように、解像度について妥協することなく、比較的大きいターゲット部分Cを露光することができる。
Claims (13)
- リソグラフィプロセスを最適化する方法であって、
照明源およびマスクの記述を受けることであって、前記マスクはリソグラフィパターンを含むことと、
前記リソグラフィプロセスのプロセスウィンドウについて前記ソースおよびマスクが同時に最適化されるまで、
前記照明源およびマスクの両方の関数としてのコスト関数を生成するステップと、
前記コスト関数の勾配を算出するステップと、
前記算出された勾配に応じて前記ソースおよびマスクの記述を再構成するステップと、を選択的に繰り返すことと、を含む、方法。 - 前記算出された勾配が0の値を有する場合、前記ソースおよびマスクは最適化される、請求項1に記載の方法。
- 前記ソースを独立したソースポイントとして特徴付けることをさらに含む、請求項2に記載の方法。
- 前記マスクを空間周波数領域の回折エレメントとして特徴付けることをさらに含む、請求項2に記載の方法。
- 前記マスク記述を再構成することは、
光近接効果補正を使用することと、
サブレゾリューションアシストフィーチャを配置することと、
前記再構成されたマスク記述を再び特徴付けることと、を含む、請求項4に記載の方法。 - 前記コスト関数は、所定のプロセスウィンドウに対する最悪エッジ配置誤差の観点から公式化される、請求項1に記載の方法。
- 前記コスト関数Fは、以下の式で表され、
- 照明源およびマスクを有するリソグラフィプロセスを最適化する方法であって、
コスト関数を前記照明源およびマスクの両方の記述の関数として生成することであって、前記コスト関数は所定のプロセスウィンドウに対する最悪エッジ配置誤差の観点から公式化されることと、
前記コスト関数の勾配を算出することと、を含む、方法。 - 前記算出するステップの前に、前記コスト関数の計算効率的近似を生成することをさらに含む、請求項8に記載の方法。
- 照明源およびマスクを有するリソグラフィプロセスを最適化する方法であって、
自由形式最適化プロセスと、
前記自由形式最適化プロセスの結果に基づいてSRAFのシードを前記マスクの記述に配置することと、
前記照明源およびマスクの両方についての製造制約を考慮に入れながら前記SRAFのシードを成長させることを含む制約最適化プロセスと、を含む、方法。 - 前記自由形式最適化プロセスは、完全に柔軟な照明源ポイントのセットを含む最適照明源を設計することを含む、請求項10に記載の方法。
- 前記照明源の前記製造制約を考慮に入れることは、前記最適照明源を回折光エレメントに適合させることを含む、請求項11に記載の方法。
- 前記マスクの前記製造制約を考慮に入れることは、マスク透過率を所定値に制約することを含む、請求項10に記載の方法。
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JP7591320B2 (ja) | 2021-08-23 | 2024-11-28 | ▲蘇▼州▲貝▼克▲微▼▲電▼子股▲ふん▼有限公司 | チップレイアウトからチップモデルを確立する方法、装置及び記憶媒体 |
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NL2005522A (en) | 2009-10-28 | 2011-05-02 | Asml Netherlands Bv | Pattern selection for full-chip source and mask optimization. |
US8234603B2 (en) * | 2010-07-14 | 2012-07-31 | International Business Machines Corporation | Method for fast estimation of lithographic binding patterns in an integrated circuit layout |
NL2007306A (en) * | 2010-09-23 | 2012-03-26 | Asml Netherlands Bv | Source polarization optimization. |
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WO2010059954A3 (en) | 2011-06-23 |
US10592633B2 (en) | 2020-03-17 |
US9111062B2 (en) | 2015-08-18 |
KR101766734B1 (ko) | 2017-08-16 |
US9953127B2 (en) | 2018-04-24 |
CN102224459A (zh) | 2011-10-19 |
CN102224459B (zh) | 2013-06-19 |
WO2010059954A2 (en) | 2010-05-27 |
JP2012510165A (ja) | 2012-04-26 |
TW201027272A (en) | 2010-07-16 |
US20150356234A1 (en) | 2015-12-10 |
TWI437377B (zh) | 2014-05-11 |
US20110230999A1 (en) | 2011-09-22 |
JP5629691B2 (ja) | 2014-11-26 |
KR20110097800A (ko) | 2011-08-31 |
US20180239861A1 (en) | 2018-08-23 |
US20200218850A1 (en) | 2020-07-09 |
US11042687B2 (en) | 2021-06-22 |
US20140068530A1 (en) | 2014-03-06 |
JP6055436B2 (ja) | 2016-12-27 |
US8584056B2 (en) | 2013-11-12 |
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