JP2006515958A - 2以上の計測された散乱計測信号間の比較によるプロセス最適化および制御の方法 - Google Patents
2以上の計測された散乱計測信号間の比較によるプロセス最適化および制御の方法 Download PDFInfo
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Abstract
【解決手段】 フォトリソグラフィシステムの1つ以上のプロセスパラメータ設定を決定する方法が開示される。この方法は、パターンの潜像、部分的に現像されたパターンまたは完全に現像されたパターンを計測する散乱計測ツール(258)を利用して実行される。散乱計測ツールは、ステッパ(254)の終わりに、またはレジスト現像器(256)の始めに配置されえる。
Description
第2差分は第2フォーカスおよび露光設定に(などに)相関付けられえる。差分はフォーカスおよび露光の関数である。
S1(P1, CD1) -S2(P1,CD2) = D1
S1(P1, CD1) -S3(P1,CD3) = D2
S2(P1, CD2) -S3(P1,CD3) = D3
T2
S4(P2, CD4) -S5(P2,CD5) = D4
S4(P2, CD4) -S6(P2,CD6) = D5
S5(P2, CD5) -S6(P2,CD6) = D6
T3
S7(P3, CD7) -S8(P3,CD8) = D7
S7(P3, CD7) -S9(P3,CD9) = D8
S8(P3, CD8) -S9(P3,CD9) = D9
Claims (31)
- 異なるプロセス応答を持つ少なくとも2つの格子構造において散乱計測法による計測を実行することによって散乱計測信号を得ることであって、前記少なくとも2つの格子構造は、同じフィールド内に位置し、互いに非常に近接している、散乱計測信号を得ること、
前記少なくとも2つの格子構造を形成するのに用いられた1つ以上のプロセスパラメータについての情報を確定するために前記少なくとも2つの異なる格子構造からの散乱計測信号を比較すること、および
前記比較に基づいて前記1つ以上のプロセスパラメータを制御すること
を含む方法。 - 請求項1に記載の方法であって、前記比較するステップは、
前記少なくとも2つの格子構造からの散乱計測信号間の差分を決定すること
を含む方法。 - 請求項2に記載の方法であって、前記比較するステップは、
前記差分を較正データと比較することによって前記1つ以上のプロセスパラメータの実効値を決定すること
をさらに含む方法。 - 請求項3に記載の方法であって、前記制御するステップは、
前記1つ以上のプロセスパラメータを前記1つ以上のプロセスパラメータの前記実効値に従って制御すること
を含む方法。 - 請求項3に記載の方法であって、前記較正データは、1つ以上の方程式、グラフまたはライブラリの形である方法。
- 請求項3に記載の方法であって、前記較正は、
異なるプロセス条件について異なるプロセス応答を持つ格子構造の複数のセットにおいて散乱計測法による計測を実行すること、
前記格子構造のそれぞれのセットについての前記散乱計測信号間の差分を計算すること、
前記差分を前記異なるプロセス条件の関数としてマッピングすること
を含む方法。 - 請求項2に記載の方法であって、前記比較するステップは、
前記差分が所定の制御限界内にあるかを決定すること
を含む方法。 - 請求項7に記載の方法であって、前記制御するステップは、
前記1つ以上のプロセスパラメータを、前記差分が前記所定の制御限界内にあるかどうかに従って制御すること
を含む方法。 - 請求項2に記載の方法であって、前記差分散乱計測信号は、互いに差をとられることによって差分信号を作る方法。
- 請求項9に記載の方法であって、差分特性が前記差分信号から得られる方法。
- 請求項10に記載の方法であって、前記差分信号またはその特性が較正データと比較されることによって、1つ以上のプロセスパラメータの実効値を決定する方法。
- 請求項1に記載の方法であって、
異なるプロセス応答を持つ前記少なくとも2つ以上の格子構造をウェーハ上にマスクで形成すること
をさらに含む方法。 - 請求項1に記載の方法であって、
そのそれぞれが1つ以上のプロセスパラメータに対して異なるように応答する格子構造を作るよう構成される2つ以上のマスキング構造を持つマスクを設計すること
をさらに含む方法。 - 1つ以上のプロセスパラメータを制御する方法であって、
少なくとも2つの格子構造について散乱計測信号を得ることであって、前記格子構造のそれぞれは、制御されることが望まれる1つ以上のプロセスパラメータに対して異なる感度を有する散乱計測信号を作る、散乱計測信号を得ること、
前記異なる格子構造を形成するのに用いられた1つ以上のプロセスパラメータについての情報を確定するために散乱計測信号を比較することであって、前記散乱計測ターゲットのそれぞれは、異なる散乱計測信号を作るよう構成され、前記差分は少なくとも一部は1つ以上のプロセスパラメータに起因する、比較すること、
を含む方法。 - 最適または最良フォーカスを決定する方法であって、
複数のフォーカス設定においてターゲットグループを形成することであって、前記ターゲットグループは、異なる感度をフォーカスに対して持つ2つ以上のターゲットを含む、形成すること、
前記ターゲットグループの前記ターゲットのそれぞれについて散乱計測信号を得ること、
それぞれのターゲットグループについて差分信号を計算すること、
前記差分信号または前記差分信号の特性間の、前記フォーカス設定に対する関係を形成すること、および
前記関係を用いて最適または最良フォーカス設定を決定すること
方法。 - 請求項15に記載の方法であって、
前記差分信号のそれぞれについて特性を計算すること
をさらに含む方法。 - 請求項16に記載の方法であって、前記特性は、2乗平均平方根差分を用いて計算される方法。
- プロセス制御方法であって、
異なる散乱計測信号を作るよう構成される2つ以上の計測可能なパターンを計測することであって、前記信号間の前記差分は少なくとも一部は、前記計測可能なパターンを作るのに用いられた1つ以上のプロセスパラメータによる、計測すること、および
フォトリソグラフィプロセスのための前記最良のプロセス条件を決定するために前記差分信号を分析することであって、前記分析ステップは、前記差分信号から1つ以上のプロセスパラメータについての情報を抽出することを含む、分析すること、
を含む方法。 - ターゲットグループであって、
異なるプロセス応答を有するよう構成される2つ以上の散乱計測ターゲットであって、前記2つ以上の散乱計測ターゲットは同じフィールド内に位置し、互いに非常に近接しており、異なるプロセス応答を持つ前記散乱計測ターゲットは、異なる散乱計測信号を作り、前記散乱計測信号の差分は、前記散乱計測ターゲットを作るのに用いられた1つ以上のプロセスパラメータに少なくとも一部はよる、散乱計測ターゲット
を備えるターゲットグループ。 - 請求項19に記載のターゲットグループであって、前記散乱計測ターゲットは格子構造であり、第1格子構造はプロセスパラメータに対する第1感度から形成される第1値を有する第1パラメータを含み、第2格子構造は前記プロセスパラメータに対する第2感度から形成される値を有する第1パラメータを含む、ターゲットグループ。
- 請求項20に記載のターゲットグループであって、前記第2感度は、前記第1感度より高いかまたは低いターゲットグループ。
- 請求項20に記載のターゲットグループであって、前記格子構造は、ワークピースの表面上にプリントされ、前記表面はフォトレジストの露光されたレイヤ、フォトレジストの部分的に現像されたレイヤ、フォトレジストの現像されたレイヤ、または前記ワークピースの下層レイヤを表すターゲットグループ。
- 請求項20に記載のターゲットグループであって、前記格子構造は、スクライブライン内に、デバイス構造内に、または前記スクライブラインおよび前記デバイス構造の両方の中に位置するターゲットグループ。
- 請求項20に記載のターゲットグループであって、前記格子構造は、一つの方向においてまたは2つの方向において周期的であるターゲットグループ。
- 請求項20に記載のターゲットグループであって、前記第1および第2格子構造は、同じピッチを有するが異なる線幅または直径を有するターゲットグループ。
- 請求項20に記載のターゲットグループであって、前記格子構造は、ポジティブトーンまたはネガティブトーンの両方であるターゲットグループ。
- 請求項20に記載のターゲットグループであって、前記格子構造の少なくとも一つは、ポジティブトーンであって、もう一つはネガティブトーンであるターゲットグループ。
- 請求項20に記載のターゲットグループであって、前記第1および第2格子構造は、同じピッチをxおよびy方向の両方に有するが、異なる光学近接効果補正(OPC)有するターゲットグループ。
- 請求項20に記載のターゲットグループであって、前記格子構造の少なくとも一つは、セグメント化されたラインを含むターゲットグループ。
- 請求項29に記載のターゲットグループであって、前記第1および第2格子構造は、同じピッチを有するが、異なるセグメント幅を有するターゲットグループ。
- 請求項29に記載のターゲットグループであって、前記第1および第2格子構造は、同じピッチを有するが、異なる形状のセグメントを有するターゲットグループ。
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WO2004066028A3 (en) | 2005-05-19 |
JP4799402B2 (ja) | 2011-10-26 |
US20040190008A1 (en) | 2004-09-30 |
WO2004066028A2 (en) | 2004-08-05 |
US7352453B2 (en) | 2008-04-01 |
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