JP2015179785A - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 209
- 239000012535 impurity Substances 0.000 claims description 18
- 230000005533 two-dimensional electron gas Effects 0.000 claims description 7
- 229910002601 GaN Inorganic materials 0.000 description 82
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 81
- 230000004888 barrier function Effects 0.000 description 25
- 230000005684 electric field Effects 0.000 description 22
- 238000004519 manufacturing process Methods 0.000 description 13
- 230000015556 catabolic process Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 239000000758 substrate Substances 0.000 description 7
- 229910002704 AlGaN Inorganic materials 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000002040 relaxant effect Effects 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- NWAIGJYBQQYSPW-UHFFFAOYSA-N azanylidyneindigane Chemical compound [In]#N NWAIGJYBQQYSPW-UHFFFAOYSA-N 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- RNQKDQAVIXDKAG-UHFFFAOYSA-N aluminum gallium Chemical compound [Al].[Ga] RNQKDQAVIXDKAG-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- -1 for example Chemical compound 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
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Abstract
【解決手段】実施形態の半導体装置は、第1のGaN系半導体層と、第1のGaN系半導体層上に設けられ、第1のGaN系半導体層よりバンドギャップの大きい第2のGaN系半導体層と、第2のGaN系半導体層上に設けられるソース電極と、第2のGaN系半導体層上に設けられるドレイン電極と、ソース電極とドレイン電極の間の第2のGaN系半導体層上に設けられるp型の第3のGaN系半導体層と、第3のGaN系半導体層上に設けられるゲート電極と、ゲート電極とドレイン電極との間であって、第2のGaN系半導体層上に設けられ、第3のGaN系半導体層と離れて設けられるp型の第4のGaN系半導体層と、を備える。
【選択図】図1
Description
本実施形態の半導体装置は、第1のGaN系半導体層と、第1のGaN系半導体層上に設けられ、第1のGaN系半導体層よりバンドギャップの大きい第2のGaN系半導体層と、第2のGaN系半導体層上に設けられるソース電極と、第2のGaN系半導体層上に設けられるドレイン電極と、ソース電極とドレイン電極の間の第2のGaN系半導体層上に設けられるp型の第3のGaN系半導体層と、第3のGaN系半導体層上に設けられるゲート電極と、ゲート電極とドレイン電極との間の、第2のGaN系半導体層の第1のGaN系半導体層と反対側に設けられ、第3のGaN系半導体層と分離されるp型の第4のGaN系半導体層と、を備える。
y×0.4×1013<d×NA<y×4×1013・・・(式1)
の関係を充足することが望ましい。
y×4×1013<d×NP<y×40×1013・・・(式2)
と変形される。
本実施形態の半導体装置は、第4のGaN系半導体層の端部が傾斜していること以外は、第1の実施形態と同様である。したがって、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。
本実施形態の半導体装置は、ゲート電極と第4のGaN系半導体層との間、または、第4のGaN系半導体層とドレイン電極との間の、第2のGaN系半導体層の第1のGaN系半導体層と反対側に設けられ、第3のGaN系半導体層および第4のGaN系半導体層と分離されるp型の第5のGaN系半導体層を、さらに備えること以外は、第1の実施形態と同様である。したがって、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。
本実施形態の半導体装置は、第2のGaN系半導体層と第4のGaN系半導体層との間にi型の第6のGaN系半導体層を備えること以外は、第1の実施形態と同様である。したがって、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。
本実施形態の半導体装置は、第1のフィールドプレート電極との間に絶縁膜を介在させて設けられ、第4のGaN系半導体層との間に絶縁膜を介在させて設けられる第2のフィールドプレート電極をさらに備え、第2のフィールドプレート電極のドレイン電極側の端部と、第2のGaN系半導体層との間に、第4のGaN系半導体層が位置すること以外は、第1の実施形態と同様である。したがって、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。
本実施形態の半導体装置は、第1のフィールドプレート電極を備えないこと以外は、第1の実施形態と同様である。したがって、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 バリア層(第2のGaN系半導体層)
18 ソース電極
20 ドレイン電極
22 キャップ層(第3のGaN系半導体層)
24 リサーフ層(第4のGaN系半導体層)
26 ゲート電極
28 ソースフィールドプレート電極(第1のフィールドプレート電極)
30 絶縁膜
32 絶縁膜
34 リサーフ層(第5のGaN系半導体層)
36 リサーフ層(第5のGaN系半導体層)
42 ゲートフィールドプレート電極(第2のフィールドプレート電極)
100 HEMT(半導体装置)
200 HEMT(半導体装置)
300 HEMT(半導体装置)
400 HEMT(半導体装置)
500 HEMT(半導体装置)
600 HEMT(半導体装置)
Claims (10)
- 第1のGaN系半導体層と、
前記第1のGaN系半導体層上に設けられ、前記第1のGaN系半導体層よりバンドギャップの大きい第2のGaN系半導体層と、
前記第2のGaN系半導体層上に設けられるソース電極と、
前記第2のGaN系半導体層上に設けられるドレイン電極と、
前記ソース電極と前記ドレイン電極の間の前記第2のGaN系半導体層上に設けられるp型の第3のGaN系半導体層と、
前記第3のGaN系半導体層上に設けられるゲート電極と、
前記ゲート電極と前記ドレイン電極との間であって、前記第2のGaN系半導体層上に設けられ、前記第3のGaN系半導体層と離れて設けられるp型の第4のGaN系半導体層と、
を備えることを特徴とする半導体装置。 - 前記第4のGaN系半導体層の前記第2のGaN系半導体層と反対側に設けられる絶縁膜と、
前記第4のGaN系半導体層との間に前記絶縁膜を介在させて設けられる第1のフィールドプレート電極をさらに備え、
前記第1のフィールドプレート電極の前記ドレイン電極側の端部と、前記第2のGaN系半導体層との間に、前記第4のGaN系半導体層が位置することを特徴とする請求項1記載の半導体装置。 - 前記第4のGaN系半導体層がフローティングであることを特徴とする請求項1または請求項2記載の半導体装置。
- 前記第4のGaN系半導体層が前記第2のGaN系半導体層に接して設けられ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4のGaN系半導体層のアクセプタの面密度が、前記第1のGaN系半導体層と前記第2のGaN系半導体層との界面に生成される2次元電子ガスの面密度よりも低い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4のGaN系半導体層の端部が傾斜してい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3のGaN系半導体層と前記第4のGaN系半導体層とが同一のp型不純物濃度を有し、前記第4のGaN系半導体層の膜厚が、前記第3のGaN系半導体層の膜厚よりも薄い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。
- 前記ゲート電極と前記第4のGaN系半導体層との間、または、前記第4のGaN系半導体層と前記ドレイン電極との間の、前記第2のGaN系半導体層の前記第1のGaN系半導体層と反対側に設けられ、前記第3のGaN系半導体層および前記第4のGaN系半導体層と分離されるp型の第5のGaN系半導体層を、さらに備える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。
- 前記第4のGaN系半導体層の膜厚が、10nm以上100nm以下であることを特徴とする請求項1ないし請求項8いずれか一項記載の半導体装置。
- 前記第1のフィールドプレート電極との間に絶縁膜を介在させて設けられ、前記第4のGaN系半導体層との間に絶縁膜を介在させて設けられる第2のフィールドプレート電極をさらに備え、
前記第2のフィールドプレート電極の前記ドレイン電極側の端部と、前記第2のGaN系半導体層との間に、前記第4のGaN系半導体層が位置することを特徴とする請求項2記載の半導体装置。
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