JP6490679B2 - 複数の注入層をもつ高電圧電界効果トランジスタ - Google Patents
複数の注入層をもつ高電圧電界効果トランジスタ Download PDFInfo
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Description
Claims (18)
- 高電圧電界効果トランジスタを製造する方法であって、
半導体基板に本体領域を形成することと、
前記半導体基板にソース領域を形成することと、
ドープnウェル領域を含み得るドレイン領域であって、前記本体領域により前記ソース領域から離間した前記ドレイン領域を前記半導体基板に形成することと、
を含み、
前記ドレイン領域を形成することが、
前記ドレイン領域の上方において前記半導体基板の表面に第1の酸化物層を形成することであって、前記第1の酸化物層が、20〜500ナノメートルの厚さをもつ、前記第1の酸化物層を形成することと、
垂直から傾いた角度で前記第1の酸化物層にイオンビームが衝突するように、前記半導体基板を傾けた状態で前記第1の酸化物層を通して複数のイオン注入工程を実施することであって、前記複数のイオン注入工程が、対応する複数の離間した注入層を前記ドレイン領域内に形成し、前記注入層の各々が、前記ドレイン領域内の異なる深さに形成される、前記複数のイオン注入工程を実施することと、
前記第1の酸化物層に重ねて第2の酸化物層を形成することであって、前記第2の酸化物層が、0.1〜2マイクロメートルの厚さをもつ、前記第2の酸化物層を形成することと、
を有し、
前記方法が、
前記本体領域の上方において前記半導体基板の前記表面を露出するエッチング工程を実施することと、
前記第1の酸化物層と前記第2の酸化物層とに接するゲート酸化物層を前記本体領域の上方に形成することと、
前記ゲート酸化物層と前記第2の酸化物層の一部との上方にゲート電極を形成することであって、前記第2の酸化物層の前記一部の上方の前記ゲート電極の一部が、前記本体領域付近の前記注入層の一部の上方に位置する、前記ゲート電極を形成することと、
をさらに含む、
高電圧電界効果トランジスタを製造する方法。 - 前記半導体基板を傾けることは、垂直から3〜10度傾いた角度で前記第1の酸化物層にイオンビームが衝突するように前記半導体基板を傾けることを含む、
請求項1の方法。 - 前記第1の酸化物層を形成することが、熱酸化工程を使用して前記第1の酸化物層を形成することを含み、
第2の酸化物層が、低温酸化物堆積工程を使用して、前記第1の酸化物層に重ねて堆積される、
請求項1または請求項2の方法。 - 前記複数の離間した注入層の各注入層が、0.1〜2マイクロメートルの厚さをもつ、
請求項1から請求項3のいずれか一項の方法。 - 前記ドレイン領域が、n型ウェルを含み、
前記複数のイオン注入工程を実施することが、3回のイオン注入工程を実施して3つの離間したp型注入層を形成することを含み、
前記p型注入層のうちの第1のp型注入層が、前記第1の酸化物層に接する前記半導体基板の前記表面に形成され、
前記p型注入層のうちの第2のp型注入層が、前記第1のp型注入層の下方に形成され、
前記p型注入層のうちの第3のp型注入層が、前記第2のp型注入層の下方に形成される、
請求項1から請求項4のいずれか一項の方法。 - 前記第1のp型注入層と前記第2のp型注入層とが、0.5〜3マイクロメートルの厚さをもつ前記n型ウェルの第1のn型領域により離間され、
前記第2のp型注入層と前記第3のp型注入層とが、0.5〜3マイクロメートルの厚さをもつ前記n型ウェルの第2のn型領域により離間される、
請求項5の方法。 - 前記ドレイン領域は、n型ウェルを含み、
前記複数のイオン注入工程を実施することが、3回のイオン注入工程を実施して前記n型ウェル内に3つの離間したp型注入層を形成することを含み、
前記n型ウェルのn型領域が、前記第1の酸化物層と第1のp型注入層との間に配設されるように、前記第1のp型注入層が、前記半導体基板の前記表面の下方に埋設され、
第2のp型注入層が、前記第1のp型注入層の下方に形成され、
第3のp型注入層が、前記第2のp型注入層の下方に形成される、
請求項1から請求項6のいずれか一項の方法。 - 前記第1のp型注入層が、0.05〜2マイクロメートルの厚さをもつ前記n型ウェルの第1のn型領域により前記第1の酸化物層から離間され、
前記第1のp型注入層と前記第2のp型注入層とが、0.5〜3マイクロメートルの厚さをもつ前記n型ウェルの第2のn型領域により離間され、
前記第2のp型注入層と前記第3のp型注入層とが、0.5〜3マイクロメートルの厚さをもつ前記n型ウェルの第3のn型領域により離間される、
請求項7の方法。 - 半導体基板に本体領域を形成することと、
前記半導体基板にソース領域を形成することと、
前記本体領域により前記ソース領域から離間されたドレイン領域を前記半導体基板に形成することと、
を含み、
前記ドレイン領域を形成することが、
前記ドレイン領域の上方において前記半導体基板の表面上に第1の酸化物層を形成することと、
前記第1の酸化物層を通して3回のイオン注入工程を実施して前記ドレイン領域内に3つの離間した注入層を形成することであって、
前記注入層の各々が、前記ドレイン領域内の異なる深さに堆積され、
前記3つの注入層のうちの第1の注入層が、前記第1の酸化物層に接する前記半導体基板の前記表面に配置される、
前記注入層を形成することと、
前記第1の酸化物層に重ねて第2の酸化物層を形成することであって、
前記第2の酸化物層が、前記第1の酸化物層より厚い、
前記第2の酸化物層を形成することと、
を有し、
前記第1の酸化物層が、20〜500ナノメートルの厚さをもち、
前記第2の酸化物層が、0.1〜2マイクロメートルの厚さをもち、
前記方法が、
エッチング工程を実施して前記本体領域の上方の前記半導体基板の前記表面を露出することと、
前記第1の酸化物層と前記第2の酸化物層とに接するゲート酸化物層を前記本体領域の上方に形成することと、
前記ゲート酸化物層の上方にゲート電極を形成することと、
をさらに含む、
高電圧電界効果トランジスタを製造する方法。 - 3回のイオン注入工程を実施することが、垂直から傾いた角度で前記第1の酸化物層にイオンビームが衝突するように、前記半導体基板を傾けることを含む、
請求項9の方法。 - 前記3つの注入層の各々が、0.1〜2マイクロメートルの厚さをもつ、
請求項9または請求項10の方法。 - 前記ドレイン領域が、n型ウェルを含み、
前記3つの注入層が、p型注入層であり、
前記p型注入層のうちの第2のp型注入層が、第1のp型注入層の下方に形成され、
前記p型注入層のうちの第3のp型注入層が、前記第2のp型注入層の下方に形成される、
請求項9から請求項11のいずれか一項の方法。 - 前記第1のp型注入層と前記第2のp型注入層とが、0.5〜3マイクロメートルの厚さをもつ前記n型ウェルの第1のn型領域により離間され、
前記第2のp型注入層と前記第3のp型注入層とが、0.5〜3マイクロメートルの厚さをもつ前記n型ウェルの第2のn型領域により離間される、
請求項12の方法。 - 半導体基板内の本体領域と、
前記半導体基板内のソース領域と、
前記本体領域により前記ソース領域から離間された前記半導体基板内のドレイン領域であって、
前記ドレイン領域が3つの離間した注入層を含み、
前記注入層の各々が前記ドレイン領域内の異なる深さにあり、及び、
前記3つの注入層のうちの第1の注入層が前記半導体基板の表面に配置される、
前記ドレイン領域と、
前記ドレイン領域の上方の前記半導体基板の前記表面にあって前記ドレイン領域の前記第1の注入層に接する第1の酸化物層と、
前記第1の酸化物層に重なる第2の酸化物層と、
前記本体領域の上方の前記表面に重なるゲート酸化物層であって、前記ゲート酸化物層が前記第1の酸化物層と前記第2の酸化物層とに接する、前記ゲート酸化物層と、
前記ゲート酸化物層の上方のゲート電極と、
を備え、
前記第1の酸化物層が、20〜500ナノメートルの厚さをもち、
前記第2の酸化物層が、0.1〜2マイクロメートルの厚さをもつ、
高電圧電界効果トランジスタ(HVFET;high−voltage field−effect transistor)。 - 前記3つの注入層の各々が、0.1〜2マイクロメートルの厚さをもつ、
請求項14のHVFET。 - 前記ドレイン領域が、n型ウェルを含み、
前記3つの注入層が、p型注入層であり、
前記p型注入層のうちの第2のp型注入層が、前記第1のp型注入層の下方に位置し、
前記p型注入層のうちの第3のp型注入層が、前記第2のp型注入層の下方に位置する、
請求項14または請求項15のHVFET。 - 前記第1のp型注入層と前記第2のp型注入層とが、0.5〜3マイクロメートルの厚さをもつ前記n型ウェルの第1のn型領域により離間され、
前記第2のp型注入層と前記第3のp型注入層とが、0.5〜3マイクロメートルの厚さをもつ前記n型ウェルの第2のn型領域により離間される、
請求項16のHVFET。 - 半導体基板に本体領域を形成すること、
前記半導体基板にソース領域を形成すること、
前記本体領域により前記ソース領域から離間されたドレイン領域を前記半導体基板に形成することであって、
前記ドレイン領域を形成することが、
前記ドレイン領域の上方において前記半導体基板の表面上に、20〜500ナノメートルの厚さをもつ第1の酸化物層を形成すること、及び、
前記酸化物層を通して3回のイオン注入工程を実施して前記ドレイン領域内に3つの離間した前記注入層を形成すること、
を有し、
前記注入層の各々が、前記ドレイン領域内の異なる深さに堆積され、
前記3つの離間した注入層の各々が、0.1〜2マイクロメートルの厚さをもつ、
前記ドレイン領域を形成すること、
前記第1の酸化物層の上方に0.1〜2マイクロメートルの厚さをもつ第2の酸化物層を形成すること、
前記第1の酸化物層と前記第2の酸化物層とに接するゲート酸化物層を前記本体領域の上方において前記半導体基板の前記表面に形成すること、並びに、
前記ゲート酸化物層と前記第2の酸化物層の一部との上方にゲート電極を形成すること、
を含む、
高電圧電界効果トランジスタを製造する方法。
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