JP6242640B2 - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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- JP6242640B2 JP6242640B2 JP2013195113A JP2013195113A JP6242640B2 JP 6242640 B2 JP6242640 B2 JP 6242640B2 JP 2013195113 A JP2013195113 A JP 2013195113A JP 2013195113 A JP2013195113 A JP 2013195113A JP 6242640 B2 JP6242640 B2 JP 6242640B2
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- H01L29/72—Transistor-type devices, i.e. able to continuously respond to applied control signals
- H01L29/739—Transistor-type devices, i.e. able to continuously respond to applied control signals controlled by field-effect, e.g. bipolar static induction transistors [BSIT]
- H01L29/7393—Insulated gate bipolar mode transistors, i.e. IGBT; IGT; COMFET
- H01L29/7395—Vertical transistors, e.g. vertical IGBT
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Description
本実施形態の半導体装置は、第1導電型のSiCの第1の領域と、第1導電型の不純物濃度が第1の領域よりも低い、第1導電型のSiCの第2の領域と、第1の領域と第2の領域に挟まれる第2導電型の第3の領域と、第1、第2および第3の領域表面に連続して設けられ、第3の領域上の膜厚が、第2の領域上の膜厚よりも厚いSi(シリコン)層と、Si層上に設けられるゲート絶縁膜と、ゲート絶縁膜上に設けられるゲート電極と、を備える。
本実施形態は、トレンチ型の縦型トランジスタである点で、第1の実施形態と異なっている。第1の実施形態と重複する内容については記述を省略する。
16 pチャネル領域(第3の領域)
18 ソース領域(第1の領域)
22 Si層
28 ゲート絶縁膜
30 ゲート電極
100 MOSFET
200 MOSFET
Claims (10)
- 第1導電型のSiCの第1の領域と、
第1導電型の不純物濃度が前記第1の領域よりも低い、第1導電型のSiCの第2の領域と、
前記第1の領域と前記第2の領域に挟まれる第2導電型の第3の領域と、
前記第1、第2および第3の領域の表面に設けられ、前記第3の領域上の膜厚が、前記第2の領域上の膜厚よりも厚く、前記第2の領域上に、膜厚が2nm以下の部分が存在するSi層と、
前記Si層上に設けられるゲート絶縁膜と、
前記ゲート絶縁膜上に設けられるゲート電極と、
を備えることを特徴とする半導体装置。 - 前記第3の領域上の前記Si層に膜厚が5nm以上の部分が存在することを特徴とする請求項1記載の半導体装置。
- 前記Si層と前記ゲート絶縁膜との界面に、前記第3の領域から前記第2の領域の方向に向けて、前記第3の領域および前記第2の領域と前記Si層との界面に近づく傾斜部分があることを特徴とする請求項1又は請求項2いずれか一項記載の半導体装置。
- 前記Si層は第1導電型であることを特徴とする請求項1ないし請求項3いずれか一項記載の半導体装置。
- 前記第3の領域上の前記Si層に膜厚が10nm以上の部分が存在することを特徴とする請求項1ないし請求項4いずれか一項記載の半導体装置。
- 前記第3の領域上の前記Si層の膜厚が100nm以下であることを特徴とする請求項1ないし請求項5いずれか一項記載の半導体装置。
- 前記第1の領域と前記第3の領域との境界部で、前記Si層の膜厚が最大であることを特徴とする請求項1ないし請求項6いずれか一項記載の半導体装置。
- 前記第2の領域上の前記ゲート絶縁膜の膜厚が、前記第3の領域上の前記ゲート絶縁膜の膜厚よりも厚いことを特徴とする請求項1ないし請求項7いずれか一項記載の半導体装置。
- 第1導電型のSiCの第1の領域の表面、第1導電型の不純物濃度が前記第1の領域よりも低い第1導電型のSiCの第2の領域の表面、および、前記第1の領域と前記第2の領域に挟まれる第2導電型のSiCの第3の領域の表面に、Si層を形成し、
前記第2の領域上の前記Si層表面が露出するように、前記Si層上にマスク材を形成し、
前記マスク材をマスクに、前記Si層を酸化することにより、前記第2の領域上の前記Si層に膜厚が2nm以下の部分を形成し、
前記マスク材を剥離し、
前記Si層表面にゲート絶縁膜を形成し、
前記ゲート絶縁膜上にゲート電極を形成することを特徴とする半導体装置の製造方法。 - 前記第1、第2および第3の領域表面に形成する前記Si層の膜厚が5nm以上であることを特徴とする請求項9記載の半導体装置の製造方法。
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