JP7084979B2 - X線スキャタロメトリーのための方法および装置 - Google Patents
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Description
本出願は2016年1月11日出願の米国暫定特許出願第62/276,988(特許文献1)の恩恵を主張し、それはここに参照して採り入れられる。
スキャタロメトリー技術は、様々なタイプの半導体デバイスおよびテスト構造内に形成されたアレイ内のフィーチャの幾何学的寸法を測定するために使用できる。小角X線散乱(SAXS)法などのX線技術は、典型的には、数オングストロームのオーダーの波長を有するX線を適用し、半導体ウェハ内に形成されたHAR孔またはトレンチなどの高アスペクト比(HAR)フィーチャを測定するのに適している。フィーチャの幾何学的特性の測定は、複数の角度でサンプルから散乱されたX線の強度の分析に基づく推定技術を使用して実行される。
図1は、本発明の1つの実施形態による小角X線散乱(SAXS)システム20の概略図である。いくつかの実施形態では、システム20は、後述されるように、スキャタロメトリー技術を使用してサンプル上のフィーチャを測定するように構成される。
図2は、本発明の1つの実施形態による、ウェハ22内のHARフィーチャから散乱された小角X線ビームの概略断面図である。図2は、ウェハ22の2つの断面図を示し、両方の図において、ビーム31はウェハ22の底面に異なる角度で衝突する。
図4は、本発明の一実施形態による、ウェハ22の孔50から散乱されたX線ビームの概略断面図である。図4は、ウェハ22の2つの断面図を含み、両図は、ビーム31がウェハ22の表面に対し実質的に近似した入射角を有することを示す。
B0は、スペクトル全体に共通の一定のバックグラウンドレベルであり;
いくつかの実施形態では、プロセッサ34は、機器的ドリフトを識別し、補償する目的で、測定強度分布を使用してX線ビームの中心の強度および/または角度位置を推定しそして追跡する。このようなドリフトは、例えば、X線源24の望ましくない熱膨張または経年変化のために発生する可能性がある。
Claims (5)
- システムであって、
X線ビームをサンプル上に仕向けるように構成されるX線源と;
検知器組立体であって、前記サンプルを通過し、および前記サンプルから1つの角度範囲に亘って散乱された1つまたはそれ以上のX線ビームを検知し、そして、前記検知されたX線ビームに応答してそれぞれの電気信号を生成するように構成される検知器組立体と;そして
X線ビームストッパであって、前記サンプルと前記検知器組立体の間に配置され、そして少なくとも第1と第2のビームストップ要素を有し、前記少なくとも第1と第2のビームストップ要素は同時に前記X線ビーム内に配置され、そして前記第1と第2のビームストップ要素の間の重なりの量を制御することにより、前記X線ビームストッパの設定可能な実効幅を設定するために、互いに対して移動可能であり、前記X線ビームストッパは、前記角度範囲の設定可能な部分的セクション内の前記X線ビームの強度を、前記設定可能な実効幅に依存して少なくとも部分的にブロックするように構成される、X線ビームストッパと;
を有することを特徴とするシステム。 - 前記X線ビームストッパは、前記実効幅を設定するために、1つの軸の周りを回転するように構成される回転型ビームストッパ要素を有する、ことを特徴とする請求項1に記載のシステム。
- 前記X線ビームストッパは、異なる実効幅を持つ2つまたはそれ以上のビームストッパ要素と、前記ビームストッパ要素が搭載されたステージを有し、そして前記ステージは1つの選択されたビームストッパ要素を前記サンプルと前記検知器組立体の間に配置することにより、前記実効幅を設定するように構成される、ことを特徴とする請求項1に記載のシステム。
- プロセッサを備え、前記プロセッサは、前記X線ビームの発散角度に応答して前記X線ビームストッパの前記実効幅を調整するように構成される、ことを特徴とする請求項1に記載のシステム。
- プロセッサを備え、前記プロセッサは、前記サンプルの繰り返しフィーチャの寸法に応答して前記X線ビームストッパの前記実効幅を調整するように構成される、ことを特徴とする請求項1に記載のシステム。
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US201662276988P | 2016-01-11 | 2016-01-11 | |
US62/276,988 | 2016-01-11 |
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US10816487B2 (en) | 2018-04-12 | 2020-10-27 | Bruker Technologies Ltd. | Image contrast in X-ray topography imaging for defect inspection |
JP2019191169A (ja) * | 2018-04-23 | 2019-10-31 | ブルカー ジェイヴィ イスラエル リミテッドBruker Jv Israel Ltd. | 小角x線散乱測定用のx線源光学系 |
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CN112654861B (zh) | 2018-07-05 | 2024-06-11 | 布鲁克科技公司 | 小角度x射线散射测量 |
US11703464B2 (en) * | 2018-07-28 | 2023-07-18 | Bruker Technologies Ltd. | Small-angle x-ray scatterometry |
KR20210028276A (ko) * | 2018-07-31 | 2021-03-11 | 램 리써치 코포레이션 | 고 종횡비 구조체들의 패터닝된 어레이들 내의 틸팅 각도 결정 |
KR102650008B1 (ko) | 2019-03-28 | 2024-03-22 | 가부시키가이샤 리가쿠 | 투과형 소각 산란 장치 |
JP7168985B2 (ja) * | 2019-04-22 | 2022-11-10 | 株式会社リガク | 微細構造の解析方法、装置およびプログラム |
CN111678928B (zh) * | 2020-06-09 | 2021-03-30 | 长江存储科技有限责任公司 | 半导体结构的分析方法及分析装置 |
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US20190339215A1 (en) | 2019-11-07 |
US20170199136A1 (en) | 2017-07-13 |
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