JP7018970B2 - 撮像ベースオーバーレイ及び散乱計測ベースオーバーレイのためのハイブリッドオーバーレイ標的設計 - Google Patents
撮像ベースオーバーレイ及び散乱計測ベースオーバーレイのためのハイブリッドオーバーレイ標的設計 Download PDFInfo
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Description
ウェハ401がチャック402上に留まっている間に実行されてもよい。したがって、ウェハ401は、撮像光学システム403による測定と散乱計測システム404の測定との間で動いてはならない。一例では、ウェハ401の周りの減圧は、撮像光学システム403による測定と散乱計測システム404の測定との間で壊されない。一例では、撮像光学システム403による測定及び散乱計測システム404による測定のうちの1つの測定は、別の測定の後に行われる。別の一例では、撮像光学システム403による測定及び散乱計測システム404による測定は、少なくとも部分的に同時に、又は同時に行われる。
Claims (10)
- 方法であって、
撮像光学システムによってチャック上のウェハのオーバーレイ標的を取得するステップであって、それにより取得画像を形成し、前記オーバーレイ標的が、撮像ベースオーバーレイ標的設計内の格子及び散乱計測ベースオーバーレイ標的設計内の格子を含み、前記撮像ベースオーバーレイ標的設計内の格子が並列格子構造であり、前記散乱計測ベースオーバーレイ標的設計内の格子が格子上格子構造である、ステップと、
前記撮像光学システムからの第1の照明ビームによって前記オーバーレイ標的を測定するステップと前記散乱計測システムからの第2の照明ビームによって前記オーバーレイ標的を測定するステップとにより、前記取得画像を得る際に、前記第1の照明ビーム及び前記第2の照明ビームによる測定の間に、前記撮像ベースオーバーレイ標的設計と前記散乱計測ベースオーバーレイ標的設計は同一視野内にある、方法。 - 前記散乱計測システムによる前記測定するステップは、前記撮像光学システムによる前記測定するステップの前にある、請求項1に記載の方法。
- 前記散乱計測ベースオーバーレイ標的設計は、前記撮像ベースオーバーレイ標的設計と比べて異なる限界寸法を有する、請求項1に記載の方法。
- 前記撮像ベースオーバーレイ標的設計及び前記散乱計測ベースオーバーレイ標的設計は、それぞれ、前記オーバーレイ標的の2つの隣接した層上に配設されている、請求項1に記載の方法。
- 前記2つの隣接した層のうちの1つの層上の前記撮像ベースオーバーレイ標的設計のためのパターンは、前記2つの隣接した層のうちの別の層上の前記撮像ベースオーバーレイ標的設計と異なる、請求項4に記載の方法。
- 前記撮像ベースオーバーレイ標的設計と前記散乱計測ベースオーバーレイ標的設計とは、前記オーバーレイ標的のセル内にあって、共通の方向軸線に沿って指向させられており、複数の前記セルが前記オーバーレイ標的上にあり、セルのうちの2つは、互いに垂直である方向軸線を有する、請求項1に記載の方法。
- 前記撮像光学システムによる前記測定するステップと前記散乱計測システムによる前記測定するステップとは、少なくとも部分的に同時に行われる、請求項1に記載の方法。
- システムであって、
オーバーレイ標的を有するウェハを保持するように構成されたチャックを備え、前記オーバーレイ標的が、撮像ベースオーバーレイ標的設計内の格子及び散乱計測ベースオーバーレイ標的設計内の格子を含み、前記撮像ベースオーバーレイ標的設計内の格子が並列格子構造であり、前記散乱計測ベースオーバーレイ標的設計内の格子が格子上格子構造であり、
第1の照明源により前記チャック上の前記オーバーレイ標的を測定するように構成された撮像光学システムと、
第2の照明源により前記チャック上の前記オーバーレイ標的を測定するように構成された散乱計測システムと、
前記撮像光学システム及び前記散乱計測システムと電気通信しているプロセッサと、
を備え、前記撮像光学システムと前記散乱計測システムとが、同じ前記オーバーレイ標的を測定するように構成されており、前記撮像ベースオーバーレイ標的設計と前記散乱計測ベースオーバーレイ標的設計が前記撮像光学システムと前記散乱計測システムの同一視野内にある、システム。 - 前記撮像光学システムによって前記チャック上の前記オーバーレイ標的を取得し、それにより取得画像を形成するように構成された撮像光学システム取得モジュールを更に備え、前記撮像光学システムは、前記取得画像を用いる、請求項8に記載のシステム。
- 前記撮像光学システムと前記散乱計測システムとは、前記オーバーレイ標的を少なくとも部分的に同時に測定するように構成されている、請求項8に記載のシステム。
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US15/995,731 US11112369B2 (en) | 2017-06-19 | 2018-06-01 | Hybrid overlay target design for imaging-based overlay and scatterometry-based overlay |
US15/995,731 | 2018-06-01 | ||
PCT/US2018/037430 WO2018236653A1 (en) | 2017-06-19 | 2018-06-14 | HYBRID RECOVERY TARGET DESIGN FOR IMAGING-BASED RECOVERY AND DIFFUSIOMETRY-BASED RECOVERY |
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JP (1) | JP7018970B2 (ja) |
KR (1) | KR102353260B1 (ja) |
CN (1) | CN110770654B (ja) |
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US11726410B2 (en) * | 2021-04-20 | 2023-08-15 | Kla Corporation | Multi-resolution overlay metrology targets |
US11862524B2 (en) * | 2021-06-28 | 2024-01-02 | Kla Corporation | Overlay mark design for electron beam overlay |
US11703767B2 (en) | 2021-06-28 | 2023-07-18 | Kla Corporation | Overlay mark design for electron beam overlay |
US11720031B2 (en) | 2021-06-28 | 2023-08-08 | Kla Corporation | Overlay design for electron beam and scatterometry overlay measurements |
US12044982B2 (en) * | 2021-12-02 | 2024-07-23 | Micron Technology, Inc. | Apparatuses and methods for diffraction base overlay measurements |
US11796925B2 (en) * | 2022-01-03 | 2023-10-24 | Kla Corporation | Scanning overlay metrology using overlay targets having multiple spatial frequencies |
TW202414770A (zh) * | 2022-09-22 | 2024-04-01 | 聯華電子股份有限公司 | 疊對圖樣與疊對方法 |
US20240110780A1 (en) * | 2022-09-30 | 2024-04-04 | Kla Corporation | Mosaic overlay targets |
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CN110770654B (zh) | 2022-11-18 |
US20180364179A1 (en) | 2018-12-20 |
SG11201911992TA (en) | 2020-01-30 |
JP2020524276A (ja) | 2020-08-13 |
KR102353260B1 (ko) | 2022-01-18 |
TWI752237B (zh) | 2022-01-11 |
KR20200010585A (ko) | 2020-01-30 |
WO2018236653A1 (en) | 2018-12-27 |
CN110770654A (zh) | 2020-02-07 |
US11112369B2 (en) | 2021-09-07 |
EP3635488A1 (en) | 2020-04-15 |
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