JP2022003696A - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP2022003696A JP2022003696A JP2021159843A JP2021159843A JP2022003696A JP 2022003696 A JP2022003696 A JP 2022003696A JP 2021159843 A JP2021159843 A JP 2021159843A JP 2021159843 A JP2021159843 A JP 2021159843A JP 2022003696 A JP2022003696 A JP 2022003696A
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- transistor
- gate electrode
- compound semiconductor
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- silicon
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 192
- 150000001875 compounds Chemical class 0.000 claims abstract description 101
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 98
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 98
- 239000010703 silicon Substances 0.000 claims abstract description 98
- 238000009792 diffusion process Methods 0.000 claims abstract description 61
- 239000000758 substrate Substances 0.000 claims abstract description 53
- 229910052594 sapphire Inorganic materials 0.000 claims description 26
- 239000010980 sapphire Substances 0.000 claims description 26
- 239000004020 conductor Substances 0.000 claims description 17
- 239000010410 layer Substances 0.000 description 180
- 238000000034 method Methods 0.000 description 37
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- 238000005229 chemical vapour deposition Methods 0.000 description 10
- 239000010936 titanium Substances 0.000 description 10
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- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 238000000206 photolithography Methods 0.000 description 6
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 6
- 229910052721 tungsten Inorganic materials 0.000 description 6
- 239000010937 tungsten Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
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- 230000015572 biosynthetic process Effects 0.000 description 4
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- 230000007257 malfunction Effects 0.000 description 3
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- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
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- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 229910052785 arsenic Inorganic materials 0.000 description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- 238000000926 separation method Methods 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
- 238000004347 surface barrier Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
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- 238000005520 cutting process Methods 0.000 description 1
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- AJNVQOSZGJRYEI-UHFFFAOYSA-N digallium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Ga+3] AJNVQOSZGJRYEI-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910003437 indium oxide Inorganic materials 0.000 description 1
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- RJCRUVXAWQRZKQ-UHFFFAOYSA-N oxosilicon;silicon Chemical compound [Si].[Si]=O RJCRUVXAWQRZKQ-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
図1は、本発明の第1の実施形態に係る半導体装置1の等価回路図である。半導体装置1は、化合物半導体素子であるノーマリーオン型の第1のトランジスタ10と、シリコン半導体素子であるノーマリーオフ型の第2のトランジスタ20とを有する。第1のトランジスタ10と第2のトランジスタ20は、カスコード接続されている。すなわち、第1のトランジスタ10のソースは、第2のトランジスタ20ドレインに接続され、第1のトランジスタ10のゲートは、第2のトランジスタ20のソースに接続されている。このように第1のトランジスタ10と第2のトランジスタ20とをカスコード接続することにより、ノーマリーオン型の第1のトランジスタ10を用いてノーマリーオフ型のスイッチを構成することが可能となる。該スイッチのオンオフ制御は、第2のトランジスタ20のゲートに制御信号を供給することで行うことが可能である。
図8は、ノーマリーオフ型のスイッチを含んで構成される本発明の第2の実施形態に係るシステムの一例である降圧型のDC−DCコンバータ100の構成を示す図である。
10、10A、10B 第1のトランジスタ
11 化合物半導体層
12、12A、12B ゲート電極
13a、13b、13aA、13aB、13bA、13bB 導電部材
20、20A、20B 第2のトランジスタ
21 シリコン層
22、22A、22B ゲート電極
23a、23aA、23aB ドレイン拡散層
23b、23bA、23bB ソース拡散層
30 サファイア基板
40 絶縁膜
61、62、63、64、65 プラグ
71、72、73、75 配線
100 DC−DCコンバータ
111 スイッチ
112 スイッチ
120 インダクタ
130 キャパシタ
Claims (5)
- 絶縁基板と、
前記絶縁基板の表面の第1の領域に設けられ、前記絶縁基板の表面に少なくとも一部が接する化合物半導体層と、
前記絶縁基板の表面の前記第1の領域とは異なる第2の領域に設けられ、前記絶縁基板の表面に少なくとも一部が接するシリコン層と、
を含む半導体装置。 - 前記絶縁基板の表面であって前記第1の領域と前記第2の領域の間の第3の領域に設けられ、前記絶縁基板の表面に少なくとも一部が接する導電体をさらに含む
請求項1に記載の半導体装置。 - 前記化合物半導体層の表面に設けられた第1のゲート電極と、
前記化合物半導体層の表面の前記第1のゲート電極を間に挟む位置に設けられた一対の導電部材と、
前記シリコン層の表面に設けられた第2のゲート電極と、
前記シリコン層内において前記第2のゲート電極を間に挟む位置に設けられた一対の拡散層と、
をさらに含み、
前記導電体は、前記導電部材の一方と前記拡散層の一方とに電気的に接続されている
請求項2に記載の半導体装置。 - 前記拡散層の他方は、前記第1のゲート電極に電気的に接続されている
請求項3に記載の半導体装置。 - 前記絶縁基板はサファイア基板であり、
前記化合物半導体層は、GaNを含む
請求項1から請求項4のいずれか1項に記載の半導体装置。
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