JP6898929B2 - 可変ゲート長の垂直電界効果トランジスタ構造及びその製造方法 - Google Patents
可変ゲート長の垂直電界効果トランジスタ構造及びその製造方法 Download PDFInfo
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- 230000007704 transition Effects 0.000 description 2
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Description
Claims (13)
- 半導体基板上に形成された第一垂直電界効果トランジスタ(FET)と、前記半導体基板上に形成された第二垂直FETとを含む、
半導体構造体であって、
前記第一垂直FETは、前記第二垂直FETのゲート高さと同一平面内にあるゲート高さを有し、
前記第一垂直FETは、前記第一垂直FET上のゲートの下方に第一層を含み、
前記第二垂直FETは、前記第二垂直FET上のゲートの下方に第二層を含み、
前記第一垂直FETおよび前記第二垂直FETは、それぞれ前記第一垂直FET上のゲートの下および横と前記第二垂直FET上のゲートの下および横とにゲート仕事関数金属層を含み、
前記第一垂直FET上の前記ゲートの下方の前記第一層および前記第二垂直FET上の前記ゲートの下方の前記第二層は、第一半導体材料から成り、
前記第二垂直FET上の前記ゲートの下方の前記第二層は、前記第一垂直FET上の前記ゲートの下方の前記第一層と同一平面内にはなく、
前記第一垂直FET上の前記ゲートの底面は、前記第二垂直FET上の前記ゲートの底面と同一平面内にはない、
構造体。 - 前記第一垂直FET上の前記ゲートの下方の前記第一層および前記第二垂直FET上の前記ゲートの下方の前記第二層は、ソースを含み、前記第一垂直FETの前記ゲートの下の前記ソースの最上面と前記第二垂直FETの前記ゲートの下の前記ソースの最上面とは同一平面内にはない、請求項1に記載の構造体。
- 前記第一垂直FET上の前記ゲートの下方の前記第一層および前記第二垂直FET上の前記ゲートの下の前記第二層は、ドレインを含み、前記第一垂直FETの前記ゲートの下の前記ドレインの最上面と前記第二垂直FETの前記ゲートの下の前記ドレインの最上面とは同一平面内にはない、請求項1に記載の構造体。
- 前記第一垂直FET上の前記ゲートの下方の前記第一層および前記第二垂直FET上の前記ゲートの下方の前記第二層は、スペーサを含み、前記第一垂直FETの前記スペーサと前記第二垂直FETの前記スペーサとは厚さが異なる、請求項1に記載の構造体。
- 前記第一垂直FET上の前記ゲートの下方の前記第一層および前記第二垂直FET上の前記ゲートの下方の前記第二層は、高K誘電体を含み、前記第一垂直FETの前記高K誘電体と前記第二垂直FET上の前記高K誘電体とは厚さが異なる、請求項1に記載の構造体。
- 前記第一垂直FET上の前記ゲートの下方の前記第一層および前記第二垂直FET上の前記ゲートの下方の前記第二層は、高K誘電体を含み、前記第一垂直FETの前記高K誘電体は垂直部分と水平部分とを含み、前記第二垂直FET上の前記高K誘電体は垂直部分を含む、請求項1に記載の構造体。
- 垂直電界効果トランジスタ(FET)構造体を作製する方法であって、前記方法は、
半導体基板の上に第一垂直FETのゲートを堆積する前に、前記半導体基板の上に前記第一垂直FETの第一層を堆積するステップと、
前記半導体基板の上に第二垂直FETのゲートを堆積する前に、前記半導体基板の上に前記第二垂直FETの第二層を堆積するステップと、
前記第一垂直FETの前記第一層を、前記第二垂直FETの前記第二層よりも低い高さにエッチングするステップと、
前記第一垂直FETおよび前記第二垂直FET両方のゲート材料を堆積するステップと、
前記第一垂直FETおよび前記第二垂直FET両方の前記ゲート材料を同一平面内の高さにエッチングするステップと、
を含み、
前記第一層および前記第二層はスペーサを含む、
方法。 - 前記第一垂直FET上の前記第一層をエッチングするステップが、前記第一層を除去するために前記第一層をエッチングするステップを含む、請求項7に記載の方法。
- 前記第一垂直FET上の前記第一層をエッチングするステップが、前記第二層と対照して、スペーサ層の一部を除去するために前記第一層をエッチングするステップを含む、請求項7に記載の方法。
- 前記第一層および前記第二層が、高Kゲート誘電体を含む、請求項7に記載の方法。
- 前記第一層および前記第二層が、垂直部分および水平部分を含む、請求項10に記載の方法。
- 前記第一垂直FET上の前記第一層をエッチングするステップが、前記第一層の前記水平部分を除去するために前記第一層をエッチングするステップを含む、請求項11に記載の方法。
- 前記第一垂直FET上の前記第一層をエッチングするステップが、前記第一層の前記水平部分の一部を除去するため前記第一層をエッチングするステップを含む、請求項11に記載の方法。
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US14/970,624 | 2015-12-16 | ||
US14/970,624 US10026653B2 (en) | 2015-12-16 | 2015-12-16 | Variable gate lengths for vertical transistors |
PCT/IB2016/057484 WO2017103752A1 (en) | 2015-12-16 | 2016-12-09 | Variable gate lengths for vertical transistors |
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DE (1) | DE112016005805T5 (ja) |
GB (1) | GB2559935B (ja) |
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