JP2022509281A - 階段貫通コンタクトを有する三次元メモリデバイスおよびその形成方法 - Google Patents
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Abstract
Description
Claims (37)
- 三次元(3D)メモリデバイスを形成するための方法であって、
基板上に誘電体スタックを形成することであって、前記誘電体スタックは、複数のインターリーブされた誘電体層および犠牲層を含む、誘電体スタックを形成することと、
前記誘電体スタックの少なくとも一方の側に階段構造を形成することと、
前記階段構造を貫通して垂直に延在して前記基板に達するダミーホールを形成することと、
前記ダミーホール内にスペーサを形成することであり、前記スペーサは中空コアを有する、スペーサを形成することと、
前記スペーサの前記中空コア内に導体層を堆積することによって、前記基板と接触する階段貫通コンタクト(TSC)を形成することであって、前記TSCは、前記階段構造を貫通して垂直に延在する、TSCを形成することとを含む、
方法。 - 前記TSCを形成する前に、前記誘電体スタック内の前記犠牲層を導体層に置き換えることによって複数のワード線を形成することをさらに含む、
請求項1に記載の方法。 - 各々が、前記ワード線のそれぞれ1つと接触する複数のワード線コンタクトを、前記TSCの形成と同時に形成することをさらに含む、
請求項2に記載の方法。 - 前記TSCを形成した後に、前記誘電体スタック内の前記犠牲層を導体層に置き換えることによって複数のワード線を形成することをさらに含む、
請求項1に記載の方法。 - 各々が、前記ワード線のそれぞれ1つと接触する複数のワード線コンタクトを形成することをさらに含む、
請求項4に記載の方法。 - 前記スペーサを形成することは、前記ダミーホール内に誘電体層を堆積させることを含む、
請求項1~5のいずれか一項に記載の方法。 - 前記誘電体層は、酸化ケイ素を含む、
請求項6に記載の方法。 - 前記誘電体層は、前記スペーサを形成する、
請求項6または7に記載の方法。 - 前記スペーサを形成することは、前記ダミーホール内に堆積された前記誘電体層を介して前記中空コアをエッチングすることを含む、
請求項6または7に記載の方法。 - 前記ダミーホールの形成と同時に、前記誘電体スタックの外側に第2のダミーホールを形成することをさらに含む、
請求項1~9のいずれか一項に記載の方法。 - 前記TSCの形成と同時に、前記第2のダミーホール内に第2の導体層を堆積することによって周辺コンタクトを形成することをさらに含み、
前記周辺コンタクトは前記基板と接触している、
請求項10に記載の方法。 - 前記第1の導体層および前記第2の導体層は同じ材料を含む、
請求項11に記載の方法。 - 前記TSCが、平面視において名目上円形状を有する、
請求項1~12のいずれか一項に記載の方法。 - 前記導体層がタングステン(W)を含む、
請求項1~13のいずれか一項に記載の方法。 - 前記インターリーブされた誘電体層および犠牲層内の前記誘電体層は酸化ケイ素を含み、
前記インターリーブされた誘電体層および犠牲層内の前記犠牲層は窒化ケイ素を含む、
請求項1~14のいずれか一項に記載の方法。 - 三次元(3D)メモリデバイスを形成するための方法であって、
複数のインターリーブされた誘電体層および犠牲層を含む誘電体スタックを基板上に形成することと、
前記誘電体スタックの少なくとも一方の側に階段構造を形成するステップと、
前記基板に達するダミーチャネル構造を形成することであって、前記ダミーチャネル構造は、前記階段構造を貫通して垂直に延在する、ダミーチャネル構造を形成することと、
前記ダミーチャネル構造の一部を除去することによってスペーサを形成することであって、前記スペーサは中空コアを有する、スペーサを形成することと、
前記スペーサの前記中空コア内に導体層を堆積することによって、前記基板と接触する階段貫通コンタクト(TSC)を形成することであって、前記TSCは、前記階段構造を貫通して垂直に延在する、TSCを形成することとを含む、
方法。 - 前記スペーサを形成する前に、前記誘電体スタック内の前記犠牲層を導体層に置き換えることによって複数のワード線を形成することをさらに含む、
請求項16に記載の方法。 - 各々が前記ワード線のそれぞれ1つと接触する複数のワード線コンタクトを、前記TSCの形成と同時に形成することをさらに含む、
請求項17に記載の方法。 - 前記TSCを形成した後に、前記誘電体スタック内の前記犠牲層を導体層に置き換えることによって複数のワード線を形成することをさらに含む、
請求項16に記載の方法。 - 各々が前記ワード線のそれぞれ1つと接触する複数のワード線コンタクトを形成することをさらに含む、
請求項19に記載の方法。 - 前記ダミーチャネル構造を形成する前に、前記階段構造を貫通して垂直に延在し、前記基板の一部を露出させるダミーホールを形成することをさらに含む、
請求項16~20のいずれか一項に記載の方法。 - 前記ダミーチャネル構造を形成することは、前記ダミーホール内に誘電体層を堆積することを含む、
請求項21に記載の方法。 - 前記誘電体層は酸化ケイ素を含む、
請求項22に記載の方法。 - 前記スペーサを形成することは、前記ダミーホール内に堆積された前記誘電体層を介して開口部をエッチングすることを含む、
請求項22または23に記載の方法。 - 前記スペーサを形成することは、前記ダミーホール内に堆積された前記誘電体層の一部を除去することを含む、
請求項22~24のいずれか一項に記載の方法。 - 前記スペーサの形成と同時に、前記誘電体スタックの外側に第2のスペーサを形成することをさらに含む、
請求項16~25のいずれか一項に記載の方法。 - 前記TSCの形成と同時に、前記第2のスペーサ内に第2の導体層を堆積することによって周辺コンタクトを形成することをさらに含み、
前記周辺コンタクトは前記基板と接触している、
請求項26に記載の方法。 - 前記第1の導体層および前記第2の導体層は同じ材料を含む、
請求項27に記載の方法。 - 前記スペーサおよび前記第2のスペーサが、名目上同じ厚さを有する、
請求項26~28のいずれか一項に記載の方法。 - 前記導体層がタングステン(W)を含む、
請求項16~29のいずれか一項に記載の方法。 - 前記インターリーブされた誘電体層および犠牲層内の前記誘電体層は酸化ケイ素を含み、
前記インターリーブされた誘電体層および犠牲層内の前記犠牲層は窒化ケイ素を含む、
請求項16~30のいずれか一項に記載の方法。 - 三次元(3D)メモリデバイスであって、
基板と、
複数のインターリーブされた導体層および誘電体層を含む、前記基板上のメモリスタックと、
前記メモリスタックの一方の側にある階段構造と、
前記メモリスタックの前記階段構造を貫通して垂直に延在する階段貫通コンタクト(TSC)であって、前記TSCは前記基板と接触している、TSCとを備える、
3Dメモリデバイス。 - 前記メモリスタックの外側の周辺コンタクトをさらに備え、
前記周辺コンタクトは前記基板と接触している、
請求項32に記載の3Dメモリデバイス。 - 前記周辺コンタクトおよび前記TSCが同じ材料を含む、
請求項33に記載の3Dメモリデバイス。 - 前記TSCおよび周辺コンタクトの各々の側壁は、名目上同じ厚さを有するスペーサによって囲まれている、
請求項33または34に記載の3Dメモリデバイス。 - 前記スペーサは酸化ケイ素を含む、
請求項35に記載の3Dメモリデバイス。 - 各々が前記階段構造内の前記導体層のそれぞれ1つと接触する複数のワード線コンタクトをさらに備える、
請求項32~36のいずれか一項に記載の3Dメモリデバイス。
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