JP2013175696A - 窒化物半導体エピタキシャルウェハ及び電界効果型窒化物トランジスタ - Google Patents
窒化物半導体エピタキシャルウェハ及び電界効果型窒化物トランジスタ Download PDFInfo
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Abstract
【解決手段】窒化物半導体エピタキシャルウェハ200は、SiC基板101と、SiC基板101上に形成されたGaN層103と、GaN層103上に形成されたAlGaN層104とを備え、GaN層103は、ウルツ鉱型の結晶構造を有し、GaN層103のc軸方向の格子定数cとGaN層103のa軸方向の格子定数aとの比c/aが1.6266以下である。
【選択図】図1
Description
[2]前記基板と、前記GaN層との間に、単層又は複数層の緩衝層が形成された前記[1]に記載の窒化物半導体エピタキシャルウェハ。
[3]前記緩衝層は、AlN層である前記[2]に記載の窒化物半導体エピタキシャルウェハ。
[4]前記基板は、ポリタイプ4H又はポリタイプ6Hの炭化ケイ素で形成された前記[1]乃至[3]のいずれかに記載の窒化物半導体エピタキシャルウェハ。
[6]前記基板と、前記GaN層との間に、単層又は複数層からなる緩衝層が形成された前記[5]に記載の電界効果型窒化物トランジスタ。
[7]前記緩衝層は、AlN層である前記[6]に記載の電界効果型窒化物トランジスタ。
[8]前記基板は、ポリタイプ4H又はポリタイプ6Hの炭化ケイ素で形成される前記[5]乃至[7]のいずれかに記載の電界効果型窒化物トランジスタ。
本実施の形態の窒化物半導体エピタキシャルウェハは、基板と、前記基板上に形成されたGaN層と、前記GaN層上に形成されたAlGaNバリア層とを備えた窒化物半導体エピタキシャルウェハにおいて、前記GaN層は、ウルツ鉱型の結晶構造を有し、前記GaN層のc軸方向の格子定数cと前記GaN層のa軸方向の格子定数aとの比c/aが1.6266以下である。
図1は、本発明の実施の形態に係る電界効果型窒化物トランジスタの概略の構成例を示す断面図である。
また、GaN層103のc軸方向の格子定数cとa軸方向の格子定数aとの比c/aを1.6266以下とすることで、電流コラプスの発生を1.2以下に抑制することができる。さらに、安定性の面から、1.6260がより好ましい。また、後述する製造方法によって、容易にGaN層103の格子定数の比c/aを1.6256以上1.6266以下とすることが可能である。比c/aが1.6266以下の範囲にある窒化物半導体エピタキシャルウェハ200を用いた電界効果型窒化物トランジスタ100は、二次元電子ガス105が空間的に誘起される場所であるGaN層103の表面側でプラスのチャージが発生しないか、あるいはマイナスのチャージが発生するため、電流コラプスを抑制することができる。
AlN層102の表面のスキューネスの制御にはV族原料とIII族原料の供給量モル比(V/III比)が関係すると考えられる。スキューネスRskを正とするためには、V/III比は1000〜8000が好ましい。
次に、窒化物半導体エピタキシャルウェハ200及び電界効果型窒化物トランジスタ100の製造方法の一例を説明する。
実施例1は、電流コラプスを例えばパルスI−Vにより測定した。他の実施例及び比較例も同じ。実施例1の電流コラプスの測定結果を図2に示す。
実施例2〜5は、AlN層形成後のSiC基板冷却工程において、H2/NH3混合ガスのH2/NH3比を、≦4の範囲内で変更したことを除き、実施例1と同様の方法で電界効果型窒化物トランジスタを製造した。AlN層形成後のSiC基板冷却工程における、H2/NH3混合ガスを、実施例2ではH2/NH3比を4、実施例3ではH2/NH3比を2.5、実施例4ではH2/NH3比を1、実施例5ではH2/NH3比を2となるように調整し、供給した。実施例2〜5で形成されたGaN層の格子定数の比c/aは、それぞれ1.6256〜1.6263であった。電流コラプスの測定結果を図2に示す。
比較例1〜5は、AlN層形成後のSiC基板冷却工程において、H2/NH3混合ガスのH2/NH3比を、>4としたことを除き、実施例1と同様の方法で電界効果型窒化物トランジスタを製造した。AlN層形成後のSiC基板冷却工程における、H2/NH3混合ガスを、比較例1ではH2/NH3比を8、比較例2ではH2/NH3比を9、比較例3ではH2/NH3比を7、比較例4ではH2/NH3比を6、比較例5ではH2/NH3比を5、となるように調整し、供給した。比較例1〜5で形成されたGaN層の格子定数の比c/aは、それぞれ1.6268〜1.6299であった。電流コラプスの測定結果を図2に示す。
Claims (8)
- 基板と、
前記基板上に形成されたGaN層と、
前記GaN層上に形成されたAlGaN層とを備え、
前記GaN層は、ウルツ鉱型の結晶構造を有し、前記GaN層のc軸方向の格子定数cと前記GaN層のa軸方向の格子定数aとの比c/aが1.6266以下である窒化物半導体エピタキシャルウェハ。 - 前記基板と、前記GaN層との間に、単層又は複数層の緩衝層が形成された請求項1に記載の窒化物半導体エピタキシャルウェハ。
- 前記緩衝層は、AlN層である請求項2に記載の窒化物半導体エピタキシャルウェハ。
- 前記基板は、ポリタイプ4H又はポリタイプ6Hの炭化ケイ素で形成された請求項1乃至3のいずれか1項に記載の窒化物半導体エピタキシャルウェハ。
- 基板と、前記基板上に形成されたGaN層と、前記GaN層上に形成されたAlGaN層と、前記AlGaN層上に直接又は中間層を介して形成されたソース電極及びドレイン電極と、前記ソース電極及び前記ドレイン電極との間に形成されたゲート電極とを備える電界効果型窒化物トランジスタであって、
前記GaN層は、ウルツ鉱型の結晶構造を有し、前記GaN層のc軸方向の格子定数cと前記GaN層のa軸方向の格子定数aとの比c/aが1.6266以下である電界効果型窒化物トランジスタ。 - 前記基板と、前記GaN層との間に、単層又は複数層からなる緩衝層が形成された請求項5に記載の電界効果型窒化物トランジスタ。
- 前記緩衝層は、AlN層である請求項6に記載の電界効果型窒化物トランジスタ。
- 前記基板は、ポリタイプ4H又はポリタイプ6Hの炭化ケイ素で形成される請求項5乃至7のいずれか1項に記載の電界効果型窒化物トランジスタ。
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JP2012078469A JP5883331B2 (ja) | 2012-01-25 | 2012-03-30 | 窒化物半導体エピタキシャルウェハの製造方法及び電界効果型窒化物トランジスタの製造方法 |
US13/722,457 US9780175B2 (en) | 2012-01-25 | 2012-12-20 | Nitride semiconductor epitaxial wafer and field effect nitride transistor |
CN201711288594.0A CN107946187B (zh) | 2012-01-25 | 2013-01-24 | 氮化物半导体外延晶片以及场效应型氮化物晶体管 |
CN201310027953.2A CN103227191B (zh) | 2012-01-25 | 2013-01-24 | 氮化物半导体外延晶片以及场效应型氮化物晶体管 |
US15/691,224 US10340345B2 (en) | 2012-01-25 | 2017-08-30 | Nitride semiconductor epitaxial wafer and field effect nitride transistor |
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JP2017107970A (ja) * | 2015-12-09 | 2017-06-15 | ルネサスエレクトロニクス株式会社 | 半導体装置およびその製造方法 |
JP2018163956A (ja) * | 2017-03-24 | 2018-10-18 | 住友電気工業株式会社 | 窒化物半導体層の成長方法 |
EP3419056A1 (en) | 2017-06-20 | 2018-12-26 | Sciocs Company Limited | Nitride semiconductor epitaxial substrate and semiconductor device |
EP3598504A1 (en) | 2018-07-19 | 2020-01-22 | Sciocs Company Limited | Nitride semiconductor epitaxial substrate and semiconductor device |
JP7503193B2 (ja) | 2019-06-24 | 2024-06-19 | 住友化学株式会社 | Iii族窒化物積層体 |
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JP5883331B2 (ja) * | 2012-01-25 | 2016-03-15 | 住友化学株式会社 | 窒化物半導体エピタキシャルウェハの製造方法及び電界効果型窒化物トランジスタの製造方法 |
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JP7503193B2 (ja) | 2019-06-24 | 2024-06-19 | 住友化学株式会社 | Iii族窒化物積層体 |
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US10340345B2 (en) | 2019-07-02 |
JP5883331B2 (ja) | 2016-03-15 |
CN103227191A (zh) | 2013-07-31 |
US20130187172A1 (en) | 2013-07-25 |
CN103227191B (zh) | 2018-01-12 |
CN107946187B (zh) | 2022-01-11 |
US9780175B2 (en) | 2017-10-03 |
CN107946187A (zh) | 2018-04-20 |
US20170365666A1 (en) | 2017-12-21 |
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