JP2013534314A - 多層オーバーレイ計測ターゲットおよび相補的オーバーレイ計測測定システム - Google Patents
多層オーバーレイ計測ターゲットおよび相補的オーバーレイ計測測定システム Download PDFInfo
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Abstract
Description
本願は、以下に列挙する出願(単数または複数)(「関連出願」)に関するものであり、係る出願(単数または複数)の最先の有効な出願日の利益を主張するものである(例えば、当該関連出願の任意および全ての親出願、祖父出願、曽祖父出願等の、仮特許出願以外の最先の優先日、または、仮特許出願のための米国法典第35編第119条(e)に基づく利益を主張するものである)。
Claims (24)
- 各ターゲット構造が2つ以上のパターン要素のセットを含む3つ以上のターゲット構造を含む複数のターゲット構造を含む多層オーバーレイターゲットであって、前記複数のターゲット構造は、前記複数のターゲット構造が位置合わせされたとき、共通の対称中心を共有するよう構成され、各ターゲット構造は前記共通の対称中心を中心とするN度回転に対して不変であり、Nは180度以上であり、前記2つ以上のパターン要素のそれぞれは個別の対称中心を有し、各ターゲット構造の前記2つ以上のパターン要素のそれぞれは前記個別の対称中心を中心とするM度回転に対して不変であり、Mは180度以上である、多層オーバーレイターゲット。
- 前記2つ以上のパターン要素のセットのうちの第1パターン要素は第1方向におけるオーバーレイ計測測定に対して適用され、前記2つ以上のパターン要素のセットのうちの第2パターン要素は前記第1方向とは異なる第2方向におけるオーバーレイ計測測定に対して適用される、請求項1に記載の多層オーバーレイターゲット。
- 第1方向におけるオーバーレイ計測測定に適用されるパターン要素のセット、および前記第1方向とは異なる第2方向におけるオーバーレイ計測測定に対して適用されるパターン要素の第2セットは共通の対称中心を有する、請求項1に記載の多層オーバーレイターゲット。
- 前記複数のターゲット構造のうちの少なくとも1つの前記2つ以上のパターン要素のうちの少なくとも1つは、
周期的なパターンで配列された、または非周期的なパターンで配列された、2つ以上のサブ要素を有するパターン要素、
を含む、請求項1に記載の多層オーバーレイターゲット。 - 各ターゲット構造の前記2つ以上のパターン要素のセットはダミーフィルの層の上方または下方にプリントされた、請求項1に記載の多層オーバーレイターゲット。
- 前記複数のターゲット構造のうちのいくつかは、前記複数のターゲット構造のうちの前記いくつかのコントラストを増強するために付加的なセットのパターン要素を含む、請求項1に記載の多層オーバーレイターゲット。
- 前記複数のターゲット構造のうちのいくつかは異なる処理層において配置された、請求項1に記載の多層オーバーレイターゲット。
- 前記複数のターゲット構造のうちの少なくとも2つは同一層内に配置され、前記少なくとも2つのターゲット構造のそれぞれは異なるリソグラフ処理において露光される、請求項1に記載の多層オーバーレイターゲット。
- 各ターゲット構造が2つ以上のパターン要素のセットを含む3つ以上のターゲット構造を含む複数のターゲット構造を含む多層オーバーレイターゲットであって、前記複数のターゲット構造は、前記複数のターゲット構造が位置合わせされたとき、共通の対称中心を共有するよう構成され、各ターゲット構造は前記共通の対称中心を中心とする90度回転に対して不変であり、前記2つ以上のパターン要素のそれぞれは個別の対称中心を有し、各ターゲット構造の前記2つ以上のパターン要素のそれぞれは前記個別の対称中心を中心とするM度回転に対して不変であり、Mは180度以上である、多層オーバーレイターゲット。
- 前記2つ以上のパターン要素のセットのうちの第1パターン要素は第1方向におけるオーバーレイ計測測定に対して適用され、前記2つ以上のパターン要素のセットのうちの第2パターン要素は前記第1方向とは異なる第2方向におけるオーバーレイ計測測定に対して適用される、請求項9に記載の多層オーバーレイターゲット。
- 第1方向におけるオーバーレイ計測測定に適用されるパターン要素のセット、および前記第1方向とは異なる第2方向におけるオーバーレイ計測測定に対して適用されるパターン要素の第2セットは共通の対称中心を有する、請求項9に記載の多層オーバーレイターゲット。
- 前記複数のターゲット構造のうちの少なくとも1つの前記2つ以上のパターン要素のうちの少なくとも1つは、
周期的なパターンで配列された、または非周期的なパターンで配列された、2つ以上のサブ要素を有するパターン要素、
を含む、請求項9に記載の多層オーバーレイターゲット。 - 各ターゲット構造の前記2つ以上のパターン要素のセットはダミーフィルの層の上方または下方にプリントされた、請求項9に記載の多層オーバーレイターゲット。
- 前記複数のターゲット構造のうちのいくつかは、前記複数のターゲット構造のうちの前記いくつかのコントラストを増強するために付加的なセットのパターン要素を含む、請求項9に記載の多層オーバーレイターゲット。
- 前記複数のターゲット構造のうちのいくつかは異なる処理層において配置された、請求項9に記載の多層オーバーレイターゲット。
- 前記複数のターゲット構造のうちの少なくとも2つは同一層内に配置され、前記少なくとも2つのターゲット構造のそれぞれは異なるリソグラフ処理において露光される、請求項9に記載の多層オーバーレイターゲット。
- 多層オーバーレイ計測ターゲットのコントラスト増強のために好適な装置であって、
照明源と、
前記照明源から発する光の少なくとも1部分を偏光させるよう構成された第1偏光器と、
前記第1偏光器により処理された光の第1部分を対物経路に沿って1つまたは複数の試料の表面に誘導し、且つ前記第1偏光器により処理された光の第2部分を基準経路に沿って誘導するよう構成された第1ビームスプリッタと、
前記1つまたは複数の試料の前記表面から反射された光の1部分を収集するよう構成された、1次光軸に沿って配置された検出器と、
前記1つまたは複数の試料の前記表面から反射された光の少なくとも1部分を、前記検出器の撮像面に前記光が当たる前に、分析するよう構成された第2偏光器であって、前記第1偏光器および前記第2偏光器は、前記1つまたは複数の試料の未パターン化された部分から反射された光が前記検出器に到達する量を最小化するよう配列された、第2偏光器と、
を含む装置。 - 前記第1偏光器の偏光軸は前記第2偏光器の偏光軸に対して実質的に垂直である、請求項17に記載の装置。
- 前記第1偏光器または前記第2偏光器のうちの少なくとも1つは直線偏光器を含む、請求項17に記載の装置。
- 前記第1偏光器は径方向偏光器を含み前記第2偏光器は方位角偏光器を含む、請求項17に記載の装置。
- 第1波長板と、
第2波長板と、
をさらに含み、
前記第1波長板は前記第1偏光器に対して選択された角度で配列され、前記第2波長板は前記第2偏光器に対して選択された角度で配列された、
請求項17に記載の装置。 - 多層オーバーレイ計測ターゲットのコントラスト増強のために好適な装置であって、
照明源と、
前記1つまたは複数の試料の表面から反射された光の1部分を収集するよう構成された、1次光軸に沿って配置された検出器と、
前記照明源から発する照明の照射角を選択するよう構成され、且つ前記照射角は選択されたコントラストレベルを前記検出器の撮像面において達成するに好適である、照明経路の瞳面に配置されたアパーチャと、
前記アパーチャを通って伝達される光の第1部分を対物経路に沿って1つまたは複数の試料の表面に誘導し、且つ前記アパーチャを通って伝達される光の第2部分を基準経路に沿って誘導するよう構成された第1ビームスプリッタと、
を含む装置。 - 可変アパーチャを含み、
前記可変アパーチャは、各アパーチャプロファイルが照明構造を作成することに対して好適である、1つまたは複数のアパーチャプロファイルを選択的に作成するよう構成された、
請求項22に記載の装置。 - 前記照明経路に沿って配置された第1偏光器と
撮像経路に沿って配置された第2偏光器と、
をさらに含み、
前記第1偏光器、前記第2偏光器、および前記アパーチャは、前記多層オーバーレイ計測ターゲットの対称点において低い強度レベルを生成するよう配列された、
請求項22に記載の装置。
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US37034110P | 2010-08-03 | 2010-08-03 | |
US61/370,341 | 2010-08-03 | ||
US13/186,144 | 2011-07-19 | ||
US13/186,144 US9927718B2 (en) | 2010-08-03 | 2011-07-19 | Multi-layer overlay metrology target and complimentary overlay metrology measurement systems |
PCT/US2011/045778 WO2012018673A2 (en) | 2010-08-03 | 2011-07-28 | Multi-layer overlay metrology target and complimentary overlay metrology measurement systems |
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CN (5) | CN113391526A (ja) |
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