JP2017068271A - 露光装置及び露光方法、並びにデバイス製造方法 - Google Patents
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Abstract
【解決手段】露光装置100は、ウエハWを保持するステージWST1と、ステージ上に設けられた複数のヘッドと露光位置の近傍にステージの外部にXY平面に略平行に配置されたスケール板21とを有し、少なくとも一部の複数のヘッドの出力に基づいて、ステージの位置情報を取得する位置計測系と、取得された位置情報に基づいて、ステージを駆動するとともに、位置計測系が位置情報を取得するために用いるヘッドのうちの1つを別のヘッドに切り換える制御系と、を備え、制御系は、第1ヘッド群に属するヘッドの出力に基づいて取得される位置情報と第2ヘッド群に属するヘッドの出力に基づいて取得される位置情報との計測誤差を修正するためのオフセットを、両群のヘッドがスケール板に対向する移動領域内にステージが位置する間に取得する。
【選択図】図1
Description
+(cosθz−sinθz)Y/√2+√2psinθz…(1)
C2=−(cosθz−sinθz)X/√2
−(cosθz+sinθz)Y/√2+√2psinθz…(2)
C3= (cosθz+sinθz)X/√2
−(cosθz−sinθz)Y/√2+√2psinθz…(3)
C4= (cosθz−sinθz)X/√2
+(cosθz+sinθz)Y/√2+√2psinθz…(4)
ただし、pは、図5に示されるように、ウエハテーブルWTB1(WTB2)の中心からのヘッドのX軸及びY軸方向に関する距離である。
D2= ptanθy+ptanθx+Z …(9)
D3= ptanθy−ptanθx+Z …(10)
D4=−ptanθy−ptanθx+Z …(11)
ただし、pは、ウエハテーブルWTB1(WTB2)の中心からのヘッドのX軸及びY軸方向に関する距離(図5参照)である。
Claims (22)
- 物体を露光する露光装置であって、
前記物体を保持し、所定平面に平行に移動する移動体と、
前記移動体上に設けられた複数のヘッドと、前記物体に対する露光位置の近傍に前記移動体の外部に前記所定平面に略平行に配置されたスケール板とを有し、前記複数のヘッドのうち、前記スケール板に計測ビームを照射し、前記スケール板からの戻りビームを受光する少なくとも一部の複数のヘッドの出力に基づいて、前記移動体の位置情報を取得する位置計測系と、
前記位置計測系で取得された前記位置情報に基づいて、前記移動体を駆動するとともに、前記移動体の位置に応じて、前記位置計測系が前記位置情報を取得するために用いる前記少なくとも一部の複数のヘッドのうちの1つのヘッドを前記複数のヘッドのうちの別のヘッドに切り換える制御系と、を備え、
前記制御系は、前記複数のヘッドのうちの第1ヘッド群に属する所定数のヘッドそれぞれの出力に基づいて取得される位置情報と前記複数のヘッドのうちの第2ヘッド群に属する所定数のヘッドそれぞれの出力に基づいて取得される位置情報との計測誤差を修正するためのオフセットを、前記第1ヘッド群に属する前記ヘッドと前記第2ヘッド群に属する前記ヘッドとのそれぞれが前記スケール板に対向する第1移動領域内に前記移動体が位置する間に取得する露光装置。 - 請求項1に記載の露光装置において、
前記第1ヘッド群は、前記1つのヘッドが前記別のヘッドに切り換えられる前に前記位置計測系が前記位置情報を取得するために用いる一群のヘッドであって、前記第2ヘッド群は、前記1つのヘッドが前記別のヘッドに切り換えられた後に前記位置計測系が前記位置情報を取得するために用いる一群のヘッドである露光装置。 - 請求項1又は2に記載の露光装置において
前記制御系は、前記第2ヘッド群の前記ヘッドが前記スケール板に対向し、かつ前記第1ヘッド群の前記ヘッドが前記スケール板に対向しない前記移動体の第2移動領域内で、前記第2ヘッド群の出力に基づいて取得される前記位置情報を修正するために前記オフセットを適用する露光装置。 - 請求項1〜3のいずれか一項に記載の露光装置において、
前記スケール板は、前記移動体が前記第1移動領域内に位置する際に前記複数のヘッドのそれぞれにそれぞれ対応する複数部分から構成される露光装置。 - 請求項1〜4のいずれか一項に記載の露光装置において、
前記スケール板には、前記所定平面内で互いに直交する2軸方向を周期方向とする2次元グレーティングが形成されている露光装置。 - 請求項5に記載の露光装置において、
前記複数のヘッドのそれぞれは、少なくとも、前記2軸方向のいずれかを計測方向とする露光装置。 - 請求項1〜6のいずれか一項に記載の露光装置において、
前記複数のヘッドのそれぞれは、少なくとも、前記所定平面に垂直な方向を計測方向とする露光装置。 - 請求項1〜7のいずれか一項に記載の露光装置において、
前記移動体に保持される前記物体上のマークを検出するマーク検出系と、
前記マーク検出系の近傍に前記移動体の外部に前記所定平面に略平行に配置された別のスケール板を有し、前記複数のヘッドのうち、前記別のスケール板に計測ビームを照射し、該別のスケール板からの戻りビームを受光する少なくとも一部の複数のヘッドの出力に基づいて、前記移動体の位置情報を取得する別の位置計測系と、をさらに備え、
前記制御系は、さらに、前記別の位置計測系で取得された前記位置情報に基づいて前記移動体を駆動する露光装置。 - 請求項8に記載の露光装置において、
前記別のスケール板は、前記移動体が前記マーク検出系の下方に位置する際に前記複数のヘッドのそれぞれにそれぞれ対応する複数部分から構成される露光装置。 - 請求項1〜9のいずれか一項に記載の露光装置において、
前記物体を露光光で露光するための投影ユニットと、
前記スケール板を支持するメトロロジーフレームと、をさらに備える露光装置。 - 物体を露光する露光方法であって、
所定平面に沿って移動する移動体で前記物体を保持することと、
前記移動体上に設けられた複数のヘッドのうち、前記物体に対する露光位置の近傍に前記移動体の外部に前記所定平面に略平行に配置されたスケール板に計測ビームを照射し、前記スケール板からの戻りビームを受光する少なくとも一部の複数のヘッドの出力に基づいて、前記移動体の位置情報を取得することと、
前記取得された位置情報に基づいて前記移動体を駆動することと、
前記移動体の位置に応じて、前記位置情報を取得するために用いられる前記少なくとも一部の複数のヘッドのうちの1つのヘッドを別のヘッドに切り換えることと、
前記複数のヘッドのうちの第1ヘッド群に属する所定数のヘッドそれぞれの出力に基づいて取得される位置情報と前記複数のヘッドのうちの第2ヘッド群に属する所定数のヘッドそれぞれの出力に基づいて取得される位置情報との計測誤差を修正するためのオフセットを、前記第1ヘッド群に属する前記ヘッドと前記第2ヘッド群に属する前記ヘッドとのそれぞれが前記スケール板に対向する第1移動領域内に前記移動体が位置する間に取得することと、を含む露光方法。 - 請求項11に記載の露光方法において
前記第1ヘッド群は、前記1つのヘッドが前記別のヘッドに切り換えられる前に前記位置計測系が前記位置情報を取得するために用いる一群のヘッドであって、前記第2ヘッド群は、前記1つのヘッドが前記別のヘッドに切り換えられた後に前記位置計測系が前記位置情報を取得するために用いる一群のヘッドである露光方法。 - 請求項11又は12に記載の露光方法において、
前記第2ヘッド群の前記ヘッドが前記スケール板に対向し、かつ前記第1ヘッド群の前記ヘッドが前記スケール板に対向しない前記移動体の第2移動領域内で、前記第2ヘッド群の出力に基づいて取得される前記位置情報を修正するために前記オフセットが適用される露光方法。 - 請求項11〜13のいずれか一項に記載の露光方法において、
前記スケール板は、前記移動体が前記第1移動領域内に位置する際に前記複数のヘッドのそれぞれにそれぞれ対応する複数部分から構成される露光方法。 - 請求項11〜14のいずれか一項に記載の露光方法において、
前記スケール板には、前記所定平面内で互いに直交する2軸方向を周期方向とする2次元グレーティングが形成されている露光方法。 - 請求項15に記載の露光方法において、
前記複数のヘッドのそれぞれは、少なくとも、前記2軸方向のいずれかを計測方向とする露光方法。 - 請求項11〜16のいずれか一項に記載の露光方法において、
前記複数のヘッドのそれぞれは、少なくとも、前記所定平面に垂直な方向を計測方向とする露光方法。 - 請求項11〜17のいずれか一項に記載の露光方法において、
前記移動体に保持される前記物体上のマークをマーク検出系で検出することと、
前記複数のヘッドのうち、前記マーク検出系の近傍に前記移動体の外部に前記所定平面に略平行に配置された別のスケール板に計測ビームを照射し、該別のスケール板からの戻りビームを受光するようにそれぞれが設けられる少なくとも一部の複数のヘッドの出力に基づいて、前記移動体の位置情報を取得することと、
前記取得された前記位置情報に基づいて前記移動体を駆動することと、をさらに含む露光方法。 - 請求項18に記載の露光方法において、
前記別のスケール板は、前記移動体が前記マーク検出系の下方に位置する際に前記複数のヘッドのそれぞれにそれぞれ対応する複数部分から構成される露光方法。 - 請求項11〜19のいずれか一項に記載の露光方法において、
前記スケール板は、前記物体を露光光で露光するための投影ユニットを支持するメトロロジーフレームによって支持される露光方法。 - デバイス製造方法であって、
請求項11〜20のいずれか一項に記載の露光方法を用いて物体を露光することと、
露光された前記物体を現像することと、を含むデバイス製造方法。 - デバイス製造方法であって、
請求項1〜10のいずれか一項に記載の露光装置を用いて物体を露光することと、
露光された前記物体を現像することと、を含むデバイス製造方法。
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