JP2016213474A - 半導体ウェハの処理 - Google Patents
半導体ウェハの処理 Download PDFInfo
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- JP2016213474A JP2016213474A JP2016096187A JP2016096187A JP2016213474A JP 2016213474 A JP2016213474 A JP 2016213474A JP 2016096187 A JP2016096187 A JP 2016096187A JP 2016096187 A JP2016096187 A JP 2016096187A JP 2016213474 A JP2016213474 A JP 2016213474A
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- trench
- semiconductor wafer
- trenches
- semiconductor material
- dopant concentration
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Abstract
【解決手段】半導体ウェハ処理システムは、半導体ウェハに、第1の横方向に互いに隣接して配置された複数のトレンチを形成するように構成されたトレンチ形成装置と、トレンチに、ドープされた半導体材料をエピタキシャル法によって充填するように構成されたトレンチ充填装置と、トレンチ形成装置およびトレンチ充填装置のうち少なくとも1つに動作可能に結合されたコントローラと、を備えており、コントローラは、エピタキシャル法による充填を行う場合に予測される、第1の横方向におけるドープされた半導体材料のドーパント濃度のばらつきと、ドーパント濃度の予測される平均値と所定の公称値との偏差と、のうち少なくとも1つを示すパラメータに依存して、トレンチ形成装置およびトレンチ充填装置のうち少なくとも1つを制御するように構成されている。
【選択図】図3
Description
前記エピタキシャル法による充填を行う場合に予測される、前記第1の横方向における前記ドープされた半導体材料のドーパント濃度のばらつきと、
前記ドーパント濃度の予測される平均値と予め定められた公称値との偏差と
のうち少なくとも1つを示すパラメータを求めるステップと、
少なくとも1つの後続の処理ステップを、前記パラメータに依存して実施するステップと
を有する。
半導体ウェハに、第1の横方向において互いに隣接して配置された複数のトレンチを形成するように構成されたトレンチ形成装置と、
前記トレンチに、ドープされた半導体材料をエピタキシャル法によって充填するように構成されたトレンチ充填装置と、
前記トレンチ形成装置および前記トレンチ充填装置のうち少なくとも1つに動作可能に結合されたコントローラと
を有し、前記コントローラは、
前記エピタキシャル法による充填を行う場合に予測される、前記第1の横方向における前記ドープされた半導体材料のドーパント濃度のばらつきと、
前記ドーパント濃度の予測される平均値と予め定められた公称値との偏差と
のうち少なくとも1つを示すパラメータに依存して、前記トレンチ形成装置および前記トレンチ充填装置のうち少なくとも1つを制御するように構成されている。
前記エピタキシャル法による充填を行う場合に予測される、前記第1の横方向Xにおける半導体材料11のドーパント濃度のばらつきと、
前記ドーパント濃度の予測される平均値と予め定められた公称値との偏差と
のうち少なくとも1つを示すパラメータを求めるステップ
を含むことができる。
前記エピタキシャル法による充填を行う場合に予測される、前記第1の横方向における前記ドープされた半導体材料のドーパント濃度のばらつきと、
前記ドーパント濃度の予測される平均値と予め定められた公称値との偏差と
のうち少なくとも1つを示すパラメータを求めること
を含むことができる。たとえば、当該パラメータを求めた後、次の半導体ウェハにトレンチを形成して、ドープされた半導体材料をエピタキシャル法によって当該トレンチに充填し、このとき、ドーパント濃度の予測されるばらつきを低減すべく、トレンチ形成およびエピタキシャル法による充填との少なくとも1つを、上記求められたパラメータに依存して制御する。
Claims (20)
- ドープされた半導体材料(11)をエピタキシャル法によって半導体ウェハ(1)の複数のトレンチ(10)に充填するステップを含む、半導体ウェハ(1)の処理方法であって、
前記トレンチ(10)は、第1の横方向(X)において互いに隣接して配置されており、
前記処理方法は、
・前記エピタキシャル法による充填を行う場合に予測される、前記第1の横方向(X)における前記ドープされた半導体材料(11)のドーパント濃度のばらつきと、前記ドーパント濃度の予測される平均値と所定の公称値との偏差と、のうち少なくとも1つを示すパラメータを求めるステップと、
・少なくとも1つの後続の処理ステップを、前記パラメータに依存して実施するステップと、
を有することを特徴とする処理方法。 - 前記ドープされた半導体材料(11)は、シリコンのバンドギャップより大きいバンドギャップを有する、
請求項1記載の処理方法。 - 前記トレンチ(10)にエピタキシャル法により充填するステップを、1400℃より高い処理温度で行う、
請求項1または2記載の処理方法。 - 前記パラメータは、少なくとも前記第1の横方向(X)における各トレンチ(10)間のドーパント濃度のばらつきを表すスカラー関数を含む、
請求項1から3までのいずれか1項記載の処理方法。 - 前記パラメータを求めるステップは、
・半導体ウェハ処理システム(3)のトレンチ形成装置(31)を用いて少なくとも1つの試験用ウェハにトレンチを形成し、前記半導体ウェハ処理システム(3)のトレンチ充填装置(32)を用いて、前記ドープされた半導体材料(11)を前記少なくとも1つの試験用ウェハのトレンチにエピタキシャル法により充填することにより、前記半導体ウェハ処理システム(3)を動作させるステップと、
・前記少なくとも1つの試験用ウェハのトレンチのうち少なくとも2つのトレンチ内のドープされた半導体材料(11)のドーパント濃度を求めるステップと、
・求められた前記ドーパント濃度に依存して前記パラメータを算出するステップと、
を含む、
請求項1から4までのいずれか1項記載の処理方法。 - 前記少なくとも1つの試験用ウェハを処理した後、前記半導体ウェハ(1)を処理するために前記半導体ウェハ処理システム(3)を用いて、前記後続の処理ステップを行う、
請求項5記載の処理方法。 - 前記処理方法は、
・それぞれ独自のトレンチ幅構成を有する複数のマスクを設けるステップ
を有し、
前記少なくとも1つの後続の処理ステップは、
・求められた前記パラメータに依存して前記複数のマスクのうち1つを選択するステップと、
・選択された前記マスクを使用して前記半導体ウェハ(1)に前記トレンチ(10)を形成するステップと、
を有する、
請求項1から6までのいずれか1項記載の処理方法。 - 前記少なくとも1つの後続の処理ステップは、
・ハードマスク(12)を作製するために前記半導体ウェハ(1)上にハードマスク材料を堆積するステップと、
・前記ハードマスク(12)を構造化するステップと、
を含み、
前記構造化は、前記第1の横方向(X)において互いに隣接して配置される複数の開口(121a〜121e)を前記ハードマスク(12)に形成することを含み、
前記第1の横方向(X)において前記開口(121a〜121e)の各幅(Wa〜We)は、前記求められたパラメータに依存して変化し、
前記少なくとも1つの後続の処理ステップはさらに、
・前記半導体ウェハ(1)に前記トレンチ(10)を、前記開口(121a〜121e)より下方に形成するステップ
を含む、
請求項1から7までのいずれか1項記載の処理方法。 - 前記ハードマスク(12)の構造化は、前記求められたパラメータに依存してウェットエッチング処理を制御することを含む、
請求項8記載の処理方法。 - 前記ハードマスク(12)の構造化は、前記パラメータに依存して半導体ウェハ処理システム(3)の露光ユニット(311)の露光焦点を制御することを含む、
請求項8または9記載の処理方法。 - 前記少なくとも1つの後続の処理ステップは、
エッチング処理ステップを前記パラメータに依存して制御して行うことにより、前記トレンチ(10)を作製すること
を含む、
請求項1から10までのいずれか1項記載の処理方法。 - 前記少なくとも1つの後続の処理ステップは、
前記トレンチ(10)の少なくとも一部のトレンチ(10a,10b)内における実質的にドープされていない半導体材料(19)の厚さ(Ta,Tb)を前記求められたパラメータに依存して調整して、前記実質的にドープされていない半導体材料(19)を前記トレンチ(10)の前記少なくとも一部のトレンチに部分的に充填すること
を含む、
請求項1から11までのいずれか1項記載の処理方法。 - 前記少なくとも1つの後続の処理ステップは、
・前記ドープされた半導体材料(11)を前記トレンチ(10)にエピタキシャル法により充填した後、打ち込み処理ステップを前記パラメータに依存して制御して行うことにより、前記ドープされた半導体材料(11)のドーパント濃度を変化させること
を含む、
請求項1から12までのいずれか1項記載の処理方法。 - 半導体ウェハ(1)を処理するための半導体ウェハ処理システム(3)であって、
・半導体ウェハ(1)に、第1の横方向(X)において互いに隣接して配置された複数のトレンチ(10)を形成するように構成されたトレンチ形成装置(31)と、
・前記トレンチ(10)に、ドープされた半導体材料(11)をエピタキシャル法によって充填するように構成されたトレンチ充填装置(32)と、
・前記トレンチ形成装置(31)および前記トレンチ充填装置(32)のうち少なくとも1つに動作可能に結合されたコントローラ(34)と、
を備えており、
前記コントローラ(34)は、
前記エピタキシャル法による充填を行う場合に予測される、前記第1の横方向(X)における前記ドープされた半導体材料(11)のドーパント濃度のばらつきと、
前記ドーパント濃度の予測される平均値と所定の公称値との偏差と、
のうち少なくとも1つを示すパラメータに依存して、前記トレンチ形成装置(31)および前記トレンチ充填装置(32)のうち少なくとも1つを制御するように構成されている、
ことを特徴とする半導体ウェハ処理システム(3)。 - 前記コントローラ(34)は、前記トレンチ形成装置(31)および前記トレンチ充填装置(32)のうち少なくとも1つを制御するために前記パラメータに基づいてフィードフォワード制御を行うように構成されている、
請求項14記載の半導体ウェハ処理システム(3)。 - 前記半導体ウェハ処理システム(3)はさらに、
前記トレンチ(10)のうち少なくとも2つのトレンチ内の前記ドープされた半導体材料(11)のドーパント濃度を求めるように構成された特定ユニット(33)
を備えており、
前記コントローラ(34)は、前記特定ユニット(33)に動作可能に結合されており、かつ、求められた前記ドーパント濃度に依存して前記パラメータを算出するように構成されている、
請求項14または15記載の半導体ウェハ処理システム(3)。 - 前記コントローラ(34)は、
・前記トレンチ形成装置(31)により、少なくとも1つの試験用ウェハに、第1の横方向(X)において互いに隣接して配置される複数のトレンチを形成する処理ステップと、
・前記トレンチ充填装置(32)により、ドープされた半導体材料(11)を前記少なくとも1つの試験用ウェハのトレンチに、エピタキシャル法により充填する処理ステップと、
・前記特定ユニット(33)により、前記少なくとも1つの試験用ウェハのトレンチのうち少なくとも2つのトレンチ内のドープされた半導体材料(11)のドーパント濃度を求める処理ステップと、
・前記少なくとも1つの試験用ウェハのトレンチ内に充填された前記ドープされた半導体材料(11)の求められた前記ドーパント濃度に基づき算出された前記パラメータに基づいて、前記トレンチ形成装置(31)および前記トレンチ充填装置(32)のうち少なくとも1つを制御することにより、前記半導体ウェハ(1)を処理する処理ステップと、
を実施するように、前記半導体ウェハ処理システム(3)を制御するように構成されている、
請求項16記載の半導体ウェハ処理システム(3)。 - 複数のトランジスタセルを備えた活性領域(15)と、
前記活性領域(15)を包囲するウェハ縁部領域(16)と、
を有する半導体ウェハ(1)であって、
前記トランジスタセルは、前記活性領域(15)内に配置された半導体ドリフト領域(13)によって負荷電流を流すように構成されており、
前記半導体ウェハ(1)はさらに、
・垂直延在方向(Z)において前記半導体ドリフト領域(13)内へ延在する複数のトレンチ(10)
を有し、
前記トレンチ(10)は第1の横方向(X)において互いに隣接して配置されており、
前記トレンチ(10)に、シリコンのバンドギャップより大きいバンドギャップを有するドープされた半導体材料(11)が充填されており、
隣接するトレンチ(10a,10b)の各対において、各対の第1のトレンチ(10a)に充填された前記ドープされた半導体材料(11)のドーパント濃度の体積積分と、各対の第2のトレンチ(10b)に充填された前記ドープされた半導体材料(11)のドーパント濃度の対応する体積積分との偏差は、10%を超えない、
ことを特徴とする半導体ウェハ(1)。 - 前記半導体ドリフト領域(13)は、シリコンのバンドギャップより大きいバンドギャップを有する半導体材料から成る、
請求項18記載の半導体ウェハ(1)。 - 前記各トランジスタセルは、前記ドープされた半導体材料(11)が充填された前記トレンチ(10)を少なくとも用いて形成された補償構造を有する、
請求項18または19記載の半導体ウェハ(1)。
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