JP6853843B2 - リソグラフィマスクのフォーカス位置を決定する方法及びそのような方法を実行するための計測系 - Google Patents
リソグラフィマスクのフォーカス位置を決定する方法及びそのような方法を実行するための計測系 Download PDFInfo
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Description
を決定する段階と、周波数領域(frequency domain)でのスペクトル
の複数のスペクトル成分S(νxi,νyi)の実数部RS(z)及び虚数部IS(z)のフォーカス依存性(focus dependence)を決定する段階と、結像光学ユニットによってスペクトル
に加えられた結像収差寄与Θを分離する段階と、結像収差寄与Θをゼルニケ多項式の線形結合として表す段階とを含む。
及び次式のように書くことができる照明光1の視野分布をもたらす。
を生じる。このスペックルスペクトルに対して次式が成り立つ。
σ:瞳平面内の照明設定の強度分布である。
P:光学ユニットの瞳伝達関数、すなわち、例えば開口及び/又は掩蔽絞りによる瞳制限効果である。
φe:光学ユニットの偶数波面収差、すなわち、偶数関数によって表すことができる収差寄与である。
を決定する段階が続く。それによって、周波数座標νx及びνyの関数としての2Dスペックルスペクトル24z1から24z7までのシーケンスが生じる。
H:物体粗度の寄与である。
Θd:結像光学ユニットのデフォーカス収差である。
Θopt:結像光学ユニットの他の結像収差寄与である。
は、リソグラフィマスクのフォーカス位置を確認するために直接用いることができる。デフォーカスのフォーカス位置zは、特に次式の第4のゼルニケ係数(fourth Zernike coefficient)Z4の関数である。
Claims (11)
- リソグラフィマスク(5)のフォーカス位置を決定するための方法であって、
1.1.リソグラフィマスク(5)を結像するための結像光学ユニット(8)を有する光学系(2)を与える段階と、
1.2.結像される構造が不在の少なくとも1つの測定領域を有するリソグラフィマスク(5)を与える段階と、
1.3.前記リソグラフィマスク(5)の前記少なくとも1つの測定領域のフォーカススタックを記録する段階と、
1.4.前記記録されたフォーカススタックの2D強度分布(15zi)を空間分解方式で評価する段階と、
を含み、
1.5.前記2D強度分布(15zi)を評価する段階は、スペックルコントラストを確認することを含み、かつ
1.6.前記2D強度分布(15zi)を評価する段階は、前記スペックルコントラストが最小値を有するフォーカス位置(z)を確認することを含み、
1.7.前記スペックルコントラストが最小値を有する前記フォーカス位置を確認することは、内挿法を含むことを特徴とし、
1.8.前記2D強度分布(15 zi )を評価する段階は、
1.8.1.前記2D強度分布(15 zi )のフーリエ変換によって該2D強度分布(15 zi )のスペクトル
を決定する段階と、
1.8.2.周波数領域での前記スペクトル
の複数のスペクトル成分S(ν xi ,ν yi )の実数部RS(z)及び虚数部IS(z)のフォーカス依存性を決定する段階と、
1.8.3.前記結像光学ユニット(8)によって前記スペクトル
に加えられた結像収差寄与(Θ opt )を分離する段階と、
を含むことを特徴とする、
方法。 - 前記結像収差寄与(Θopt)をゼルニケ多項式の線形結合として表す段階は、ゼルニケ係数Znを確認することを含むことを特徴とする請求項2に記載の方法。
- 線形回帰法(最小二乗当て嵌め)が、対称ゼルニケ係数Znを確認するために使用されることを特徴とする請求項3に記載の方法。
- 前記フォーカス位置は、第4のゼルニケ係数Z4から直接確認されることを特徴とする請求項2から請求項4のいずれか1項に記載の方法。
- 評価する段階は、専らフーリエ変換及び線形代数を含むことを特徴とする請求項1から請求項5のいずれか1項に記載の方法。
- 鏡面対称照明設定が、前記測定領域を照明するのに使用されることを特徴とする請求項1から請求項6のいずれか1項に記載の方法。
- 少なくとも部分的にコヒーレントな照明放射線(1)が、前記測定領域を照明するのに使用されることを特徴とする請求項1から請求項7のいずれか1項に記載の方法。
- コヒーレントな照明放射線(1)が、前記測定領域を照明するのに使用されることを特徴とする請求項1から請求項8のいずれか1項に記載の方法。
- 請求項1から請求項9のいずれか1項に記載の方法を実行するための計測系(2)であって、
照明放射線(1)を用いて前記測定領域を照明するための照明光学ユニット(7)を含み、かつ前記測定領域を空間分解検出デバイス(9)の上に結像するための結像光学ユニット(8)を含む、
計測系(2)。 - 前記記録されたフォーカススタックの2D強度分布(15zi)を評価するために、コンピュータデバイス(10)が、前記空間分解検出デバイス(9)にデータ転送方式で接続されることを特徴とする請求項10に記載の計測系(2)。
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JPH03155112A (ja) * | 1989-11-13 | 1991-07-03 | Nikon Corp | 露光条件測定方法 |
US5300786A (en) * | 1992-10-28 | 1994-04-05 | International Business Machines Corporation | Optical focus phase shift test pattern, monitoring system and process |
JP2000021289A (ja) | 1998-07-03 | 2000-01-21 | Canon Inc | 電子放出素子、電子源、画像形成装置及びそれらの製造方法 |
DE10220816A1 (de) | 2002-05-10 | 2003-11-20 | Zeiss Carl Microelectronic Sys | Reflektives Röntgenmikroskop und Inspektionssystem zur Untersuchung von Objekten mit Wellenlängen 100 nm |
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US6869739B1 (en) * | 2003-01-28 | 2005-03-22 | International Business Machines Corporation | Integrated lithographic print and detection model for optical CD |
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