JPWO2013035843A1 - Ga2O3系半導体素子 - Google Patents
Ga2O3系半導体素子 Download PDFInfo
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Abstract
Description
第1の実施の形態では、Ga2O3系半導体素子としてのプレーナゲート構造を有するGa2O3系MISFET(Metal Insulator Semiconductor Field Effect Transistor)について説明する。
図1は、第1の実施の形態に係るGa2O3系MISFETの断面図である。Ga2O3系MISFET10は、α−Al2O3基板2上に形成されたn型α−(AlxGa1-x)2O3単結晶膜3と、n型α−(AlxGa1-x)2O3単結晶膜3上に形成されたソース電極12及びドレイン電極13と、n型α−(AlxGa1-x)2O3単結晶膜3中にソース電極12及びドレイン電極13の下にそれぞれ形成されたコンタクト領域14、15と、n型α−(AlxGa1-x)2O3単結晶膜3のコンタクト領域14とコンタクト領域15の間の領域上にゲート絶縁膜16を介して形成されたゲート電極11と、コンタクト領域14を囲むボディ領域17とを含む。
α−(AlxGa1-x)2O3単結晶膜の製造方法の一例として、分子線エピタキシー(MBE;Molecular Beam Epitaxy)法による方法を以下に説明する。MBE法は、単体あるいは化合物の固体をセルと呼ばれる蒸発源で加熱し、加熱により生成された蒸気を分子線として基板表面に供給する結晶成長方法である。
図3は、第2の実施の形態に係るGa2O3系MISFETの断面図である。Ga2O3系MISFET20は、α−Al2O3基板2上に形成されたアンドープα−(AlxGa1-x)2O3単結晶膜4と、アンドープα−(AlxGa1-x)2O3単結晶膜4上に形成されたソース電極22及びドレイン電極23と、アンドープα−(AlxGa1-x)2O3単結晶膜4中のソース電極22及びドレイン電極23の下にそれぞれ形成されたコンタクト領域24、25と、アンドープα−(AlxGa1-x)2O3単結晶膜4のコンタクト領域24とコンタクト領域25の間の領域上にゲート絶縁膜26を介して形成されたゲート電極21とを含む。
第3の実施の形態は、アンドープα−(AlxGa1-x)2O3単結晶膜4の代わりにp型α−(AlxGa1-x)2O3単結晶膜が形成される点において第2の実施の形態と異なる。第2の実施の形態と同様の点については、説明を省略又は簡略化する。
本実施の形態によれば、ホモエピタキシャル成長法を用いて高品質なα−(AlxGa1-x)2O3単結晶膜を形成し、そのα−(AlxGa1-x)2O3単結晶膜を用いて、高品質のGa2O3系半導体素子を形成することができる。また、これらのGa2O3系半導体素子は、高品質なα−(AlxGa1-x)2O3単結晶膜をチャネル層として用いるため、優れた動作性能を有する。
Claims (4)
- α−Al2O3基板上に直接、又は他の層を介して形成されたα−(AlxGa1-x)2O3単結晶(0≦x<1)からなるα−(AlxGa1-x)2O3単結晶膜と、
前記α−(AlxGa1-x)2O3単結晶膜上に形成されたソース電極及びドレイン電極と、
前記α−(AlxGa1-x)2O3単結晶膜中に形成され、前記ソース電極及び前記ドレイン電極にそれぞれ接続された第1のコンタクト領域及び第2のコンタクト領域と、
前記α−(AlxGa1-x)2O3単結晶膜の前記第1のコンタクト領域と前記第2のコンタクト領域との間の領域上にゲート絶縁膜を介して形成されたゲート電極と、
を含むGa2O3系半導体素子。 - 前記α−(AlxGa1-x)2O3単結晶膜、第1のコンタクト領域、及び第2のコンタクト領域はn型であり、
前記α−(AlxGa1-x)2O3単結晶膜中の第1のコンタクト領域を囲むp型又は高抵抗のボディ領域を含む、
請求項1に記載のGa2O3系半導体素子。 - 前記α−(AlxGa1-x)2O3単結晶膜は、ドーパントを含まない高抵抗の領域であり、
第1のコンタクト領域、及び第2のコンタクト領域はn型である、
請求項1に記載のGa2O3系半導体素子。 - 前記α−(AlxGa1-x)2O3単結晶膜はp型であり、
第1のコンタクト領域、及び第2のコンタクト領域はn型である、
請求項1に記載のGa2O3系半導体素子。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2011196437 | 2011-09-08 | ||
JP2011196437 | 2011-09-08 | ||
PCT/JP2012/072899 WO2013035843A1 (ja) | 2011-09-08 | 2012-09-07 | Ga2O3系半導体素子 |
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JPWO2013035843A1 true JPWO2013035843A1 (ja) | 2015-03-23 |
JP6142358B2 JP6142358B2 (ja) | 2017-06-07 |
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JP2013532671A Active JP6142358B2 (ja) | 2011-09-08 | 2012-09-07 | Ga2O3系半導体素子 |
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US (1) | US20140217470A1 (ja) |
JP (1) | JP6142358B2 (ja) |
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- 2012-09-07 WO PCT/JP2012/072899 patent/WO2013035843A1/ja active Application Filing
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- 2012-09-07 US US14/343,652 patent/US20140217470A1/en not_active Abandoned
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US10944015B2 (en) | 2017-08-24 | 2021-03-09 | Flosfia Inc. | Semiconductor device |
US12107125B2 (en) | 2019-07-12 | 2024-10-01 | Flosfia Inc. | Oxide semiconductor film and semiconductor device |
US11476116B2 (en) | 2020-08-13 | 2022-10-18 | Korea Institute Of Ceramic Engineering And Technology | Manufacturing method of gallium oxide thin film for power semiconductor using dopant activation technology |
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