JP6107430B2 - 半導体装置 - Google Patents
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- 239000004065 semiconductor Substances 0.000 title claims description 49
- 230000001681 protective effect Effects 0.000 claims description 82
- 230000015556 catabolic process Effects 0.000 claims description 38
- 239000000758 substrate Substances 0.000 claims description 19
- 239000012535 impurity Substances 0.000 claims description 11
- 239000003989 dielectric material Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 description 137
- 229910004298 SiO 2 Inorganic materials 0.000 description 21
- 239000000463 material Substances 0.000 description 17
- 230000005684 electric field Effects 0.000 description 13
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 10
- 150000004767 nitrides Chemical class 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000002955 isolation Methods 0.000 description 5
- 239000002356 single layer Substances 0.000 description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 4
- 229910006252 ZrON Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 4
- 229910052718 tin Inorganic materials 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 3
- 229920005591 polysilicon Polymers 0.000 description 3
- 229910017083 AlN Inorganic materials 0.000 description 2
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 2
- 229910004143 HfON Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- SLXKOJJOQWFEFD-UHFFFAOYSA-N 6-aminohexanoic acid Chemical compound NCCCCCC(O)=O SLXKOJJOQWFEFD-UHFFFAOYSA-N 0.000 description 1
- 229910002704 AlGaN Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
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Description
本本発明とは別の発明において、半導体装置は縦型のトランジスタであってもよい。
(1)段差部15側面15a近傍(たとえば側面15aからεs/3以内の距離の範囲)における、段差部15底面15bでの保護膜16の厚さd0 (底面15bに垂直な方向の厚さ)が一定である場合。
この場合は、底面15bからpn接合界面19までの高さh0 (底面15bに垂直な方向の距離)から、段差部15底面15bでの保護膜16の厚さd0 を引いた距離をhとする(図1参照)。
(2)保護膜16の段差部15側面15a近傍における、段差部15底面15bでの保護膜16の厚さが、段差部15側面15aに向かうにつれて薄くなっている場合(図6(a)参照)。
この場合には、底面15bからpn接合界面19までの高さh0 から、保護膜16の段差部15側面15a近傍における、段差部15底面15bでの保護膜16の最も薄い厚さd0 を引いた距離をhとする(図6(a)参照))。
(3)保護膜16の段差部15側面15a近傍における、段差部15底面15bでの保護膜16の厚さが、段差部15側面15aに向かうにつれて厚くなっている場合(図6(b)参照)。
この場合には、段差部15側面15aに露出するpn接合界面19aからの距離がεs/3である保護膜16表面を16aとし、その表面16aでの保護膜16の厚さをd0 として、底面15bからpn接合界面19までの高さh0 から、厚さd0 を引いた距離をhとする(図6(b)参照))。
以下、εs*h/d≧4、かつ、εs/d≧3とすることで、高い耐圧性能が得られることを支持する実験例を説明する。
11、21:n層
12、22:p層
13:n電極
14:p電極
15、30:段差部
16、31:保護膜
17、32:フィールドプレート電極
19、33、34:pn接合界面
23:高濃度n層
24:トレンチ
25:ゲート絶縁膜
26:ゲート電極
28:ソース電極
29:ドレイン電極
Claims (7)
- 縦型のトレンチゲートMOSFETである半導体装置において、
n−GaNからなる基板と、
n−GaNからなり、前記基板上に設けられたn層と、
p−GaNからなり、前記n層上に設けられた層であって、前記n層との間にpn接合界面を形成するp層と、
前記p層上に設けられたn−GaNからなる高濃度n層と、
前記n層に達するトレンチと、
前記トレンチの開口近傍、前記トレンチの側面、および底面に連続して設けられたゲート絶縁膜と、
前記トレンチ内部に前記ゲート絶縁膜に接触して設けられたゲート電極と、
前記高濃度n層表面から前記p層に達する溝と、
前記溝を介して前記高濃度n層および前記p層と接続するソース電極と、
前記基板の裏面に設けられたドレイン電極と、
素子外周に設けられ、側面に前記pn接合界面が露出する段差部と、
前記段差部の側面および底面を連続して覆う誘電体からなる保護膜と、
前記保護膜を介して前記段差部の側面および底面を連続して覆うフィールドプレート電極と、
を有し、
前記段差部の底面における前記保護膜の厚さであって、底面に垂直方向での厚さの最小値をd 0 、前記段差部の底面から前記pn接合界面までの高さをh 0 とし、h 0 −d 0 をh(μm)、保護膜の比誘電率をεs、前記段差部側面の前記pn接合界面端部から、前記保護膜と前記フィールドプレート電極との界面までの最短距離をd(μm)として、
εs*h/dが4以上、εs/dが3(1/μm)以上、hが0.5μm以上、かつdがh/2(μm)以上であり、耐圧が1200V以上である、
ことを特徴とする半導体装置。 - h/dが0.5以上であることを特徴とする請求項1に記載の半導体装置。
- 前記段差部底面と前記段差部側面とのなす角が70〜90°であることを特徴とする請求項1または請求項2に記載の半導体装置。
- 前記段差部の底部の角は丸められていることを特徴とする請求項1ないし請求項3のいずれか1項に記載の半導体装置。
- 前記保護膜は、前記段差部側面の前記pn接合界面での厚さが、前記段差部底面における厚さよりも薄い、ことを特徴とする請求項1ないし請求項4のいずれか1項に記載の半導体装置。
- 耐圧はεs*h/2に正比例して増加し、耐圧が1200V以上となるようにεs*h/2が設定されている、ことを特徴とする請求項1ないし請求項5のいずれか1項に記載の半導体装置。
- 前記高濃度n層のn型不純物濃度は、1.0×10 18 /cm 3 〜1.0×10 20 /cm 3 であり、前記p層のp型不純物濃度は、前記高濃度n層のn型不純物濃度以下であって1.0×10 17 /cm 3 〜1.0×10 20 /cm 3 である、ことを特徴とする請求項1ないし請求項6のいずれか1項に記載の半導体装置。
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JP6007769B2 (ja) * | 2012-12-14 | 2016-10-12 | 豊田合成株式会社 | 半導体装置 |
WO2015097581A1 (en) * | 2013-12-23 | 2015-07-02 | Hkg Technologies Limited | Power semiconductor devices having semi-insulating field plate |
JP6341077B2 (ja) | 2014-12-09 | 2018-06-13 | 豊田合成株式会社 | 半導体装置の製造方法 |
JP6344264B2 (ja) * | 2015-02-27 | 2018-06-20 | 豊田合成株式会社 | 半導体装置およびその製造方法 |
JP6644295B2 (ja) * | 2015-08-26 | 2020-02-12 | 学校法人法政大学 | 半導体装置 |
JP6644294B2 (ja) * | 2015-08-26 | 2020-02-12 | 学校法人法政大学 | 半導体装置 |
JP2018018903A (ja) * | 2016-07-26 | 2018-02-01 | トヨタ自動車株式会社 | 半導体装置 |
JP6683972B2 (ja) | 2016-08-26 | 2020-04-22 | 学校法人法政大学 | 半導体装置とその製造方法および半導体積層物 |
CN109473354A (zh) * | 2018-10-10 | 2019-03-15 | 华中科技大学 | 一种基于碳化硅的漂移阶跃恢复二极管的制备方法及产品 |
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JP2004303927A (ja) * | 2003-03-31 | 2004-10-28 | Sanken Electric Co Ltd | 半導体素子 |
JP5135663B2 (ja) * | 2004-10-21 | 2013-02-06 | 富士電機株式会社 | 半導体装置およびその製造方法 |
WO2010024243A1 (ja) * | 2008-08-26 | 2010-03-04 | 本田技研工業株式会社 | バイポーラ型半導体装置およびその製造方法 |
JP5633992B2 (ja) | 2010-06-11 | 2014-12-03 | トヨタ自動車株式会社 | 半導体装置および半導体装置の製造方法 |
CN102097492A (zh) * | 2010-12-24 | 2011-06-15 | 中山大学 | 异质结构场效应二极管及制造方法 |
JP2012256698A (ja) * | 2011-06-08 | 2012-12-27 | Hitachi Cable Ltd | 半導体ダイオード |
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2013
- 2013-05-30 JP JP2013114431A patent/JP6107430B2/ja active Active
- 2013-06-06 CN CN201310223568.5A patent/CN103489926B/zh active Active
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US9356140B2 (en) | 2016-05-31 |
JP2014013886A (ja) | 2014-01-23 |
CN103489926B (zh) | 2016-08-31 |
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