JP4898869B2 - 角度分解した分光リソグラフィの特徴付けの方法および装置 - Google Patents
角度分解した分光リソグラフィの特徴付けの方法および装置 Download PDFInfo
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Description
(1)分光スキャッタメータは、波長の関数として固定角度にて散乱光の特性を測定し、通常はキセノン、重水素、またはキセノンアーク灯のようなハロゲン系光源のような広帯域光源を使用する。固定角度は、垂直入射か斜め入射でよい。
(2)角度分解スキャッタメータは、入射角の関数として固定波長にて散乱光の特性を測定し、通常は単一波長の光源としてレーザを使用する。
− 放射線(例えばDUV放射線)の投影ビームPBを供給し、この特定のケースでは放射線ソースLAも有する放射線システムEx、ILと、
− マスクMA(例えばレチクル)を保持するマスクホルダが設けられ、かつ、品目PLに対して正確にマスクの位置決めを行う第一位置決めデバイスに連結を行った第一オブジェクトテーブル(マスクテーブル)MTと、
− 基板W(例えばレジスト塗布したシリコンウェハ)を保持する基板ホルダが設けられ、かつ、品目PLに対して正確に基板の位置決めを行う第二位置決めデバイスに連結を行った第二オブジェクトテーブル(基板テーブル)WTと、
− マスクMAの照射部分を基板Wの目標部分C(例えば、1つあるいはそれ以上のダイから成る)に描像する投影システム(「投影レンズ」)PL(例えば屈折レンズシステム)PLを有する。
1.ステップモードにおいては、マスクテーブルMTは基本的に静止状態に保たれている。そして、マスクの像全体が1回の作動(すなわち1回の「フラッシュ」)で目標部分Cに投影される。次に基板テーブルWTがX方向および/あるいはY方向にシフトされ、異なる目標部分CがビームPBにより照射され得る。
2.スキャンモードにおいて、基本的に同一シナリオが適用されるが、但し、ここでは、所定の目標部分Cは1回の「フラッシュ」では露光されない。代わって、マスクテーブルMTが、速度vにて所定方向(いわゆる「走査方向」、例えばY方向)に運動可能であり、それによってビームPBがマスクの像を走査する。これと同時に、基板テーブルWTが速度V=Mvで、同一方向あるいは反対方向に運動する。ここで、MはレンズPLの倍率(一般的にM=1/4あるいは1/5)である。このように、解像度を妥協することなく、比較的大きな目標部分Cを露光することが可能となる。
A(k)は、瞳面の位置kにおける未知の表明強度であり、
B(k)は、センサの検出ブランチにおける未知の光学的損失であり、
R±Nは、格子オブジェクトのN次の回折効率である。
(1)2回の像平面測定を実行して、大きいオーバレイエラーが存在しないことを検証する。
(2)以前の測定により、オーバレイが約200nmより小さいことが示されれば、瞳面の測定を実行する。
200nmの基準は指示的な例である。任意の賢明な閾値にすることができる。像平面CCDが1000×1000個のピクセルを有し、基板レベルでピクセルのピッチが100nmであると仮定すると、視野は合計で100×100μm2となり、これはパターン認識および位置合わせには十分であるが、それでも20〜50nmのオーダーの正確さで粗いオーバレイ測定が可能になる。
Claims (8)
- 基板の複数の目標の特性を同時に測定するように構成されたスキャッタメータであって、
開口数が高いレンズと、
複数の照明スポットを基板に投影するように構成された投影装置と、
基板の表面から反射した複数の照明スポットの角度分解スペクトルを検出するように構成された検出器とを有し、
基板の複数の目標の特性は、レンズの開口数が高い瞳面にて、反射したスペクトルの特性を複数の角度で同時に測定することによって測定可能であり、
基板の複数の目標の特性がさらに、レンズの開口数が高い瞳面にて、反射したスペクトルの特性を複数の波長で同時に測定することによって測定され、
複数の波長がそれぞれ、δλの帯域および少なくとも2δλの間隔を有する、スキャッタメータ。 - 基板の複数の目標の特性を同時に測定するように構成されたスキャッタメータであって、
開口数が高いレンズと、
複数の照明スポットを基板に投影するように構成された投影装置と、
基板と開口数が高いレンズとの間で液体を有するスペースとを有し、
基板の複数の目標の特性が、レンズの開口数が高い瞳面にて、基板の表面から反射した複数の照明スポットの角度分解スペクトルの特性を、複数の角度および複数の波長で同時に測定することによって測定することができるスキャッタメータ。 - 反射したスペクトルの特性が、(a)横方向磁気および横方向電気偏光の強度、(b)横方向磁気偏光と横方向電気偏光との間の位相差、または(a)と(b)との両方を有する、請求項2に記載のスキャッタメータ。
- 前記複数の照明スポットを提供するように構成されたソースと基板との間の波長マルチプレクサと、
基板と、反射したスペクトルの特性を測定するように構成された検出器との間のデマルチプレクサとを有する、請求項2に記載のスキャッタメータ。 - デバイス製造方法であって、
複数の照明スポットを基板に投影することと、
基板上の複数の目標を同時に測定するために、レンズの開口数が高い瞳面にて、所定の範囲の角度および波長にわたって複数の照明スポットの反射スペクトルを同時に測定するために、スキャッタメータを使用することとを含む方法。 - 基板上の複数の目標の特性を同時に測定するように構成されたスキャッタメータであって、
開口数が高いレンズと、
複数の照明スポットを基板に投影するように構成された投影装置と、
基板の表面から反射した複数の照明スポットの角度分解スペクトルを同時に検出するように構成された検出器とを有し、
基板の特性が、レンズの開口数が高い瞳面にて、反射したスペクトルの特性を複数の角度で同時に測定することによって測定可能であるスキャッタメータ。 - 2つの同一に偏光した照明スポットを生成するディバイダを有する、請求項6に記載のスキャッタメータ。
- デバイス製造方法であって、
放射線のビームを基板の目標部分に投影することと、
ビームが基板に到達する前に、ビームを複数のビームに分割することと、
基板上の複数の目標を同時に測定するために、レンズの開口数が高い瞳面にて、所定の範囲の角度および波長にわたって複数のビームの反射スペクトルを同時に測定するようにスキャッタメータを使用することとを含む方法。
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US10/918,742 US7791727B2 (en) | 2004-08-16 | 2004-08-16 | Method and apparatus for angular-resolved spectroscopic lithography characterization |
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