JP2022173222A - 高空間分解能を有するx線ビームの特性評価のための方法及びシステム - Google Patents
高空間分解能を有するx線ビームの特性評価のための方法及びシステム Download PDFInfo
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Abstract
Description
その関係は、式(4)に記述されている。
Claims (30)
- 計測システムであって、
X線照明ビームを生成するように構成されたX線照明サブシステムと、
試料位置決めシステムであって、前記X線照明ビームが試料の表面上のいずれかの位置で前記試料の表面に入射するように前記試料を前記X線照明ビームに対して位置決めし、前記X線照明ビームが複数の入射角でいずれかの位置で前記試料の表面に入射するように前記試料を回転軸線の周りで前記X線照明ビームに対して回転させ、前記X線照明ビームが複数の方位角でいずれかの位置で前記試料の表面に入射するように前記試料を方位回転軸線の周りで回転させるように構成された試料位置決めシステムと、
円筒形ピン及び前記円筒形ピンの中心軸線と整列した平面内に配設された1つ又は複数の目印を含むビーム遮蔽校正標的と、
前記試料位置決めシステムの位置の範囲にわたって透過光束の量を検出するように構成されたX線検出器であって、前記X線照明ビームの少なくとも一部分は、前記位置の範囲にわたって前記円筒形ピンに入射する、X線検出器と、
前記透過光束の検出された量に基づいて、前記試料位置決めシステムに対する前記X線照明ビームの入射位置を決定するように構成された計算システムと、を備える計測システム。 - 前記位置の範囲は、入射角の範囲を含み、前記計算システムは、前記回転軸線と前記X線照明ビームとを整列させるために、前記X線照明ビームに対する前記回転軸線の位置の調整を決定するように更に構成されている、請求項1に記載の計測システム。
- 前記X線照明ビームに対する前記回転軸線の位置の調整の決定は、前記透過光束の検出された量に基づいている、請求項2に記載の計測システム。
- 複数の異なる入射角で、前記1つ又は複数の目印あるいは前記試料上に配設された1つ又は複数の目印のうちの少なくとも一部分の複数の画像を生成する整列カメラを更に備え、前記1つ又は複数の目印あるいは前記試料上に配設された1つ又は複数の目印に対する前記回転軸線の位置の不整列が、前記複数の画像内で測定された、前記1つ又は複数の目印あるいは前記試料上に配設された1つ又は複数の目印の変位に基づいて決定される、請求項2に記載の計測システム。
- 前記X線照明ビームに対する前記回転軸線の位置を調整するために、前記X線照明サブシステムの1つ又は複数の要素の位置を調整するように構成された1つ又は複数の作動装置を更に備える、請求項2に記載の計測システム。
- 前記回転軸線と前記X線照明ビームとを整列させるために、前記X線照明ビームに対する前記試料位置決めシステムの位置を調整するように構成された1つ又は複数の作動装置を更に備える、請求項2に記載の計測システム。
- 前記試料位置決めシステムに対する前記X線照明ビームの入射位置を決定することは、前記X線照明ビームに対する前記円筒形ピンの位置の関数としての透過光束のモデルに基づいている、請求項1に記載の計測システム。
- 前記目印の少なくとも一部分の画像を生成する整列カメラを更に備え、前記計算システムは、前記画像に基づいて前記試料位置決めシステムの座標系内に前記目印を設置し、前記目印の位置及び前記目印と前記円筒形ピンとの間の既知の距離に基づいて、前記試料位置決めシステムの座標系内での前記X線照明ビームの入射位置を推定するように更に構成されている、請求項1に記載の計測システム。
- 前記整列カメラは、前記試料上に配置された少なくとも1つの基準目印の画像を生成し、前記計算システムは、前記画像に基づいて、前記基準目印を前記試料位置決めシステムの座標系内に設置するように更に構成されている、請求項8に記載の計測システム。
- 前記整列カメラは、前記試料と共に前記回転軸線の周りを回転する、請求項9に記載の計測システム。
- ウェハ表面のほぼ法線の方向に前記試料位置決めシステムに対する前記試料の裏側表面の位置を測定するように構成された1つ又は複数のセンサ、前記ウェハ表面のほぼ法線の方向に前記試料位置決めシステムに対する前記試料の表側表面の位置を測定するように構成された1つ又は複数のセンサ、あるいはそれらの組合せを更に備える、請求項1に記載の計測システム。
- 前記ビーム遮蔽校正標的は、前記試料位置決めシステム又は前記試料上に配設されている、請求項1に記載の計測システム。
- X線照明源と前記試料との間にある照明ビーム経路の有意な部分を包囲する第1真空室を更に備える、請求項1に記載の計測システム。
- 前記試料と前記X線検出器との間にある収集ビーム経路の有意な部分を包囲する第1真空室を更に備える、請求項1に記載の計測システム。
- 計測システムであって、
X線照明ビームを生成するように構成されたX線照明源と、
試料位置決めシステムであって、前記X線照明ビームが試料の表面上のいずれかの位置で前記試料の表面に入射するように前記試料を前記X線照明ビームに対して位置決めし、前記X線照明ビームが複数の入射角でいずれかの位置で前記試料の表面に入射するように前記試料を回転軸線の周りで前記X線照明ビームに対して回転させ、前記X線照明ビームが複数の方位角でいずれかの位置で前記試料の表面に入射するように前記試料を方位回転軸線の周りで回転させるように構成された試料位置決めシステムと、
周期校正標的であって、前記周期校正標的上の既知の範囲の1つ又は複数の周期構造、及び前記1つ又は複数の周期構造と整列した平面内に配設された1つ又は複数の目印を含む、周期校正標的と、
前記試料位置決めシステムの位置の範囲にわたって透過光束の量を検出するように構成されたX線検出器であって、前記X線照明ビームの少なくとも一部分は、前記位置の範囲にわたって前記1つ又は複数の周期構造に入射する、X線検出器と、
前記透過光束の検出された量に基づいて、前記試料位置決めシステムに対する前記X線照明ビームの入射位置を決定するように構成された計算システムと、を備える計測システム。 - 前記位置の範囲は、入射角の範囲を含み、前記計算システムは、前記透過光束の検出された量に基づいて、前記X線照明ビームに対する前記回転軸線の位置の調整を決定するように更に構成されている、請求項15に記載の計測システム。
- 前記周期校正標的は、周期数、方向又はその両方が異なる2つの周期構造の間にある境界線を含み、前記1つ又は複数の目印に対する前記境界線の位置は、200ナノメートル未満の正確度で既知である、請求項15に記載の計測システム。
- 前記周期校正標的は、周期数、方向又はその両方が異なる3つ以上の周期構造の間に交点を含み、前記1つ又は複数の目印に対する前記交点の位置は、200ナノメートル未満の正確度で既知である、請求項15に記載の計測システム。
- 前記1つ又は複数の周期構造のそれぞれの高さは、少なくとも500マイクロメータである、請求項15に記載の計測システム。
- 前記1つ又は複数の周期構造のピッチは、200ナノメートル未満である、請求項15に記載の計測システム。
- 前記1つ又は複数の周期構造は、タングステン、炭化タングステン又はプラチナから製作される、請求項15に記載の計測システム。
- 前記周期校正標的は、前記試料位置決めシステム又は前記試料上に配設されている、請求項15に記載の計測システム。
- 方法であって、
X線照明サブシステムによってX線照明ビームを生成するステップと、
前記X線照明ビームが試料の表面上のいずれかの位置で前記試料の表面に入射するように前記試料を前記X線照明ビームに対して位置決めするステップと、
前記X線照明ビームが複数の入射角でいずれかの位置で前記試料の表面に入射するように前記試料を回転軸線の周りで前記X線照明ビームに対して回転させるステップと、
前記X線照明ビームが複数の方位角でいずれかの位置で前記試料の表面に入射するように前記試料を方位回転軸線の周りで回転させるステップと、
校正標的を前記X線照明ビームによって照明するステップであって、前記校正標的は、1つ又は複数の目印を含む、ステップと、
試料位置決めシステムの位置の範囲にわたって透過光束の量を検出するステップであって、前記X線照明ビームの少なくとも一部分は、前記位置の範囲にわたって前記校正標的に入射する、ステップと、
前記透過光束の検出された量に基づいて、前記試料位置決めシステムに対する前記X線照明ビームの入射位置を決定するステップと、を含む方法。 - 前記回転軸線と前記X線照明ビームとを整列させるために、前記X線照明ビームに対する前記回転軸線の位置の調整を決定するステップを更に含み、前記位置の範囲は、入射角の範囲を含む、請求項23に記載の方法。
- 前記X線照明ビームに対する前記回転軸線の位置の調整を決定するステップは、前記透過光束の検出された量に基づいている、請求項24に記載の方法。
- 複数の異なる入射角で、前記1つ又は複数の目印あるいは前記試料上に配置された1つ又は複数の目印の少なくとも一部分の複数の画像を生成するステップを更に含み、前記1つ又は複数の目印又は前記試料上に配設された前記1つ又は複数の目印に対する前記回転軸線の位置の不整列は、前記複数の画像内で測定された、前記1つ又は複数の目印又は前記試料上に配設された前記1つ又は複数の目印の変位に基づいて決定される、請求項24に記載の方法。
- 前記X線照明ビームに対する前記回転軸線の位置を調整するために、前記X線照明サブシステムの1つ又は複数の要素の位置を調整するステップを更に含む、請求項24に記載の方法。
- 前記回転軸線と前記X線照明ビームとを整列させるために、前記X線照明ビームに対する前記試料位置決めシステムの位置を調整するステップを更に含む、請求項24に記載の方法。
- 前記校正標的は、既知の範囲の1つ又は複数の周期構造を含み、前記1つ又は複数の目印は、前記1つ又は複数の周期構造と整列した平面内に配設されている、請求項23に記載の方法。
- 前記校正標的は、円筒形ピンを含み、前記1つ又は複数の目印は、前記円筒形ピンの中心軸線と整列した平面内に配設されている、請求項23に記載の方法。
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IL270359B1 (en) | 2023-07-01 |
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US20180328868A1 (en) | 2018-11-15 |
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WO2018209134A1 (en) | 2018-11-15 |
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