JP7083027B2 - 半導体デバイスの製造方法と集積半導体デバイス - Google Patents
半導体デバイスの製造方法と集積半導体デバイス Download PDFInfo
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- JP7083027B2 JP7083027B2 JP2020535614A JP2020535614A JP7083027B2 JP 7083027 B2 JP7083027 B2 JP 7083027B2 JP 2020535614 A JP2020535614 A JP 2020535614A JP 2020535614 A JP2020535614 A JP 2020535614A JP 7083027 B2 JP7083027 B2 JP 7083027B2
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Description
本発明は半導体製造の分野に関し、具体的には、半導体デバイスの製造方法と集積半導体デバイスに関する。
第一ドープタイプの半導体基板を用意し、前記第一ドープタイプの半導体基板の表面において第一領域と第二領域とを有する第一ドープタイプのエピタキシャル層を形成することと、
前記第一領域と前記第二領域のそれぞれにて第二ドープタイプのディープウェルを少なくとも二つ形成することと、
前記第一ドープタイプのエピタキシャル層上に第一誘電体アイランドと第二誘電体アイランドとを含む複数の誘電体アイランドを形成し、前記第一誘電体アイランドの一部が前記第一領域における隣接する二つの前記第二ドープタイプのディープウェル間の領域を覆い、他の部分が前記第二領域における隣接する二つの前記第二ドープタイプのディープウェル間の領域を覆い、そして前記第一誘電体アイランドは前記隣接する二つの前記第二ドープタイプのディープウェルのいずれにも接触せず、前記第二誘電体アイランドの一部が前記第一領域に位置する前記第二ドープタイプのディープウェルの領域の一部を覆い、他の部分が前記第二領域に位置する前記第二ドープタイプのディープウェルの領域の一部を覆い、前記第一領域と前記第二領域内の前記第二誘電体アイランド両側の第二ドープタイプのディープウェルが第一ドープタイプのソース領域を形成する予定の領域となることと、
前記第一領域中の前記第一誘電体アイランド両側のエピタキシャル層のそれぞれにおいて、前記第一領域における第一ドープタイプのソース領域を形成する予定の領域まで伸びる第一ドープタイプのチャネルを形成することと、
前記第一ドープタイプのエピタキシャル層上において、前記第一領域と前記第二領域に位置する第一誘電体アイランドのそれぞれを覆うように、前記第二誘電体アイランド及び前記第一領域と前記第二領域のそれぞれに位置する前記した第一ドープタイプのソース領域を形成する予定の領域を露出させるゲート構造を形成することと、
前記ゲート構造と前記第二誘電体アイランドをマスクとして第一ドープタイプのソース領域のためのイオン注入を行って、前記第一領域と前記第二領域のそれぞれにおいて第一ドープタイプのソース領域を形成することと、
を少なくとも含み、
前記第一ドープタイプと前記第二ドープタイプは互いに逆となるものである、半導体デバイスの製造方法。
以下、図1A~1Gと図2を参照し、本発明による半導体デバイスの製造方法と半導体デバイスについて例示的に説明する。そのうち、図1A~1Gは本発明による一実施例にかかる半導体デバイスの製造方法において形成される半導体デバイスの構造模式図であり、図2は本発明による一実施例にかかる半導体デバイスの製造方法のフローチャートである。
本発明は、実施例1に記載の方法で製造された半導体デバイスを含む集積半導体デバイスをさらに提供する。
Claims (14)
- 半導体デバイスの製造方法であって、
第一ドープタイプの半導体基板を用意し、前記第一ドープタイプの半導体基板の表面において第一領域と第二領域とを有する第一ドープタイプのエピタキシャル層を形成することと、
前記第一領域と前記第二領域のそれぞれにて第二ドープタイプのディープウェルを少なくとも二つ形成することと、
前記第一ドープタイプのエピタキシャル層上に第一誘電体アイランドと第二誘電体アイランドとを含む複数の誘電体アイランドを形成し、前記第一誘電体アイランドの一部が前記第一領域における隣接する二つの前記第二ドープタイプのディープウェル間の領域を覆い、他の部分が前記第二領域における隣接する二つの前記第二ドープタイプのディープウェル間の領域を覆い、そして前記第一誘電体アイランドは前記隣接する二つの前記第二ドープタイプのディープウェルのいずれにも接触せず、前記第二誘電体アイランドの一部が前記第一領域に位置する前記第二ドープタイプのディープウェルの領域の一部を覆い、他の部分が前記第二領域に位置する前記第二ドープタイプのディープウェルの領域の一部を覆い、前記第一領域中の前記第二誘電体アイランド両側の第二ドープタイプのディープウェルと前記第二領域中の前記第二誘電体アイランド両側の第二ドープタイプのディープウェルが第一ドープタイプのソース領域を形成する予定の領域となることと、
前記第一領域中の前記第一誘電体アイランド両側のエピタキシャル層のそれぞれにおいて、前記第一領域における第一ドープタイプのソース領域を形成する予定の領域まで伸びる第一ドープタイプのチャネルを形成することと、
前記第一ドープタイプのエピタキシャル層上において、前記第一領域と前記第二領域に位置する第一誘電体アイランドのそれぞれを覆うように、前記第二誘電体アイランド及び前記第一領域と前記第二領域のそれぞれに位置する前記した第一ドープタイプのソース領域を形成する予定の領域を露出させるゲート構造を形成することと、
前記ゲート構造と前記第二誘電体アイランドをマスクとして第一ドープタイプのソース領域のためのイオン注入を行って、前記第一領域と前記第二領域のそれぞれにおいて第一ドープタイプのソース領域を形成することと、
を少なくとも含み、
前記第一ドープタイプと前記第二ドープタイプは互いに逆となるものであることを特徴とする、半導体デバイスの製造方法。 - 前記第一ドープタイプのソース領域を形成した後にソースを形成することをさらに含み、つまり、
前記第一ドープタイプのエピタキシャル層上に、前記ゲート構造と前記第一ドープタイプのソース領域を覆いながら前記第二誘電体アイランドを露出させる誘電体層を形成することと、
前記第二誘電体アイランドと一部の前記誘電体層を除去して、前記第二ドープタイプのディープウェルに位置する前記第一ドープタイプのソース領域の一部及び前記第二誘電体アイランド下に位置する領域を露出させる開口を形成することと、
前記第一ドープタイプのエピタキシャル層上に前記開口を充填する前記ソースを形成することと、
をさらに含み、
前記ソースは、第一領域ソースと第二領域ソースとを含み、前記第一領域ソースは、前記第一領域に位置する前記第二ドープタイプのディープウェル及び前記第二ドープタイプのディープウェルに位置する前記第一ドープタイプのソース領域に接触し、前記第二領域ソースは、前記第二領域に位置する前記第二ドープタイプのディープウェル及び前記第二ドープタイプのディープウェルに位置する前記第一ドープタイプのソース領域に接触し、前記第一領域ソースと第二領域ソースは接触していないことを特徴とする、請求項1に記載の製造方法。 - 前記第一ドープタイプのソース領域を形成した後、前記ソースを形成する前に、前記第一ドープタイプのソース領域下に第二ドープタイプのウェル領域を形成することをさらに含むことを特徴とする、請求項2に記載の製造方法。
- 前記第二誘電体アイランドと一部の前記誘電体層を除去して開口を形成した後、前記ソースを形成する前に、残りの前記誘電体層をマスクとして第二ドープタイプのソース領域のためのイオン注入を実行して、前記第一ドープタイプのソース領域同士間の領域に第二ドープタイプのソース領域を形成し、前記第一ドープタイプのソース領域のためのイオン注入よりも前記第二ドープタイプのソース領域のためのイオン注入は注入量が小さいことを特徴とする、請求項2に記載の製造方法。
- 前記第二ドープタイプのソース領域を形成した後、前記ソースを形成する前に、前記第二ドープタイプのソース領域下に、両側の前記第二ドープタイプのウェル領域を接続する別の第二ドープタイプのウェル領域を形成することを特徴とする、請求項3に記載の製造方法。
- 前記第一ドープタイプのエピタキシャル層は、前記第一領域と前記第二領域との間に位置する第三領域をさらに含み、前記第一領域と前記第二領域のそれぞれに少なくとも二つの第二ドープタイプのディープウェルが形成されるとともに、前記第三領域に少なくとも一つの前記第二ドープタイプのディープウェルが形成されることを特徴とする、請求項1に記載の製造方法。
- 前記第一ドープタイプのエピタキシャル層上に複数の誘電体アイランドを形成するとともに、前記第三領域に位置する前記第二ドープタイプのディープウェルを覆うフィールド酸化物を形成することを特徴とする、請求項6に記載の製造方法。
- 前記第二ドープタイプのディープウェルを形成することは、
前記第一ドープタイプのエピタキシャル層上に、前記した第二ドープタイプのディープウェルを形成するつもりの領域を露出させるパターン化マスク層を形成することと、
第二ドープタイプのディープウェルのためのイオン注入を行って、前記第一ドープタイプのエピタキシャル層に第二ドープタイプのディープウェルを形成することと、
前記パターン化マスク層を除去することと、
を含むことを特徴とする、請求項1に記載の製造方法。 - 前記第二ドープタイプのディープウェルのためのイオン注入の後、第二ドープタイプのディープウェルの焼きなましを実行することをさらに含み、前記第二ドープタイプのディープウェルの焼きなましは温度範囲が1100℃~1200℃であり、時間範囲が60min~300minであることを特徴とする、請求項8に記載の製造方法。
- 前記誘電体アイランドを形成した後、前記第一ドープタイプのチャネルを形成する前に、デバイスの閾値電圧を調整するための閾値電圧調整用注入をさらに含むことを特徴とする、請求項1に記載の製造方法。
- 前記ゲート構造は、下から上へ順次積層されたゲート誘電体層とゲート材料層とを含むことを特徴とする、請求項1に記載の製造方法。
- 前記ソースを形成した後、前記第一ドープタイプの半導体基板の裏面にドレインを形成することをさらに含むことを特徴とする、請求項2に記載の製造方法。
- 前記した第一ドープタイプのソース領域のためのイオン注入では、イオン注入用のエネルギ範囲は50Kev~150Kevであり、注入量範囲は5.0E15/cm2~1.0E16/cm2であることを特徴とする、請求項1に記載の製造方法。
- 前記半導体デバイスはVDMOSデバイスを含み、前記第一領域に位置する半導体デバイスはディプリーション型VDMOSデバイスであり、前記第二領域に位置する半導体デバイスはエンハンスメント型VDMOSデバイスであることを特徴とする、請求項1乃至請求項13のいずれか一つに記載の製造方法。
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