JP5224289B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP5224289B2 JP5224289B2 JP2009115502A JP2009115502A JP5224289B2 JP 5224289 B2 JP5224289 B2 JP 5224289B2 JP 2009115502 A JP2009115502 A JP 2009115502A JP 2009115502 A JP2009115502 A JP 2009115502A JP 5224289 B2 JP5224289 B2 JP 5224289B2
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- 239000004065 semiconductor Substances 0.000 title claims description 279
- 239000000758 substrate Substances 0.000 claims description 59
- 239000010410 layer Substances 0.000 claims description 38
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 34
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 34
- 239000011229 interlayer Substances 0.000 claims description 20
- 239000012535 impurity Substances 0.000 claims description 14
- 229910052710 silicon Inorganic materials 0.000 claims description 12
- 239000010703 silicon Substances 0.000 claims description 12
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 11
- 230000005669 field effect Effects 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 7
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 7
- 238000009792 diffusion process Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 235000012239 silicon dioxide Nutrition 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000005304 joining Methods 0.000 claims description 2
- 230000015556 catabolic process Effects 0.000 description 43
- 230000000694 effects Effects 0.000 description 20
- 230000007547 defect Effects 0.000 description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 11
- 230000005684 electric field Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 239000011733 molybdenum Substances 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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Description
6(以下、これらを、p型ガードリング領域107と総称する)が環状に設けられている。p型ガードリング領域107は、pn接合領域108を取り囲むように、それぞれ所定の間隙を隔てて設けられている。
図1から図3を参照して、実施の形態1にかかる半導体装置の構成について説明する。実施の形態1にかかる半導体装置は、第1導電型であり、1対の第1主表面および第2主表面を有するn型半導体基板1を備えている。n型半導体基板1の第1主表面の中央部には、n型半導体基板1の第1主表面からn型半導体基板1の第2主表面に向かって所定の深さに伸びる第2導電型であるp型半導体領域2が設けられている。
上述の構成による半導体装置に対し、電圧を印加したときの作用および効果について説明する。この半導体装置に対し、アノード電極13が正、カソード電極14が負となる極性の順方向電圧を印加したとき、pn接合領域8が順方向バイアス状態になる。すると、p型半導体領域2からn型半導体基板1に少数キャリアとなる正孔が注入され、カソード電極14からn型半導体基板1に電子が注入される。これにより、n型半導体基板1の内部には正孔および多数の電子が含まれることになる。
図4(特に右側)を参照して、導電膜11の連設部11Aは、いわゆる千鳥状に設けられているとよい。より具体的には、導電膜11、11のうち、一の導電膜の連設部11AAを、この一の導電膜と法線方向(矢印P方向)に隣り合い、且つ断続的に設けられる領域を含む他の導電膜に対して法線方向(矢印P方向)に投影してなる投影部形状11MPの周方向の最大間隔L2は、この他の導電膜の破断部11BPの形状の周方向の最小間隔L1に含まれるとよい。
図1から図11を参照して、上述では本発明にかかる半導体装置として、pnダイオードの例について説明したが、pn接合により電圧を保持する半導体装置であればMOSFETなどであってもよい。すなわち、pnダイオードの主表面において、ゲート電極を有する電界効果トランジスタ(FET)が形成された半導体装置であればよい。ゲート電極を有する電界効果トランジスタは、MOSFETの他に、たとえばIGBT、GTO、バイポーラトランジスタ、またはサイリスタなどを含む。
図1から図11を参照して、上述では本発明に係る半導体装置として、pnダイオードの例について説明した。ここでは、図15から図17を参照して、実施の形態2にかかる半導体装置の構成として。ショットキー接合により電圧を保持する半導体装置、すなわちショットバリアダイオード(以下、SBDと称する)の例について説明する。
実施の形態2にかかる半導体装置を構成する、n-型半導体領域51、p型半導体領域52、およびn+型半導体領域53は、珪素Siまたは炭化珪素SiCを用いるとよい。特に、これらの構成に炭化珪素SiCを用いるとなおよい。
Claims (16)
- 第1導電型の半導体基板と、
前記半導体基板の第1主表面から前記半導体基板の第2主表面に向かって所定の深さで設けられ、前記半導体基板との接合領域が環状となる第2導電型の不純物拡散領域と、
前記半導体基板の前記第1主表面において、前記接合領域を取り囲むように設けられ、法線方向にそれぞれ所定の間隙を隔てて複数配置される環状の第2導電型のガードリングと、
前記半導体基板の前記第1主表面を覆うように設けられる第1層間絶縁膜と、
前記第1層間絶縁膜を厚さ方向に貫通するコンタクトホールの内部を含むよう設けられ、前記ガードリングに電気的に接続される導電膜と、
前記第1層間絶縁膜および前記導電膜を覆うように設けられる第2層間絶縁膜と、を備え、
前記第2層間絶縁膜は半絶縁性の材料であり、
前記導電膜は、複数の前記ガードリングと前記第2層間絶縁膜との間の位置において、環状の前記ガードリングに沿って断続的に設けられる領域を含み、
前記断続的に設けられる前記領域は、前記導電膜の部材が設けられている連設部および前記導電膜の部材が設けられていない破断部を有する、半導体装置。 - 前記半導体基板はn型であり、
前記不純物拡散領域はp型であり、
前記接合領域によりpn接合が形成され、
当該半導体装置は、前記pn接合により印加された電圧を保持する、請求項1に記載の半導体装置。 - 前記半導体基板は、珪素および炭化珪素のいずれかが用いられる、請求項2に記載の半導体装置。
- 前記半導体基板の前記第1主表面において、ゲート電極を有する電界効果トランジスタが形成され、
前記ゲート電極および前記ガードリングに電気的に接続される前記導電膜は、poly−Siが用いられる、請求項1から3のいずれか1項に記載の半導体装置。 - 前記半導体基板の前記第1主表面において、ゲート電極を有する電界効果トランジスタが形成され、
前記ゲート電極および前記ガードリングに電気的に接続される前記導電膜は、Moが用いられる、請求項1から3のいずれか1項に記載の半導体装置。 - 前記半導体基板はn型であり、
前記不純物拡散領域はp型であり、
当該半導体装置は、前記半導体基板に設けられたショットキー接合により印加された電圧を保持し、
前記接合領域は、前記ショットキー接合を取り囲むように設けられる、請求項1に記載の半導体装置。 - 前記半導体基板は、炭化珪素が用いられる、請求項6に記載の半導体装置。
- 前記第1層間絶縁膜は、二酸化珪素であり、
前記第2層間絶縁膜は、半絶縁性の窒化珪素である、請求項1から7のいずれか1項に記載の半導体装置。 - 前記窒化珪素の導電率[1/Ωcm]が、室温で1×10−13以下、110℃で1×10−12以上である、請求項8に記載の半導体装置。
- 前記断続的に設けられる前記領域を含む前記導電膜のうち一の導電膜の前記連設部を、前記一の導電膜と法線方向に隣り合い、且つ前記断続的に設けられる前記領域を含む他の導電膜に対して法線方向に投影してなる投影部形状の周方向の最大間隔は、前記他の導電膜の前記破断部の形状の周方向の最小間隔に含まれる、請求項1から9のいずれか1項に記載の半導体装置。
- 前記断続的に設けられる前記領域を含む前記導電膜の前記破断部のうち一の破断部の周方向の最小間隔は、前記一の破断部を法線方向に挟んで対向する前記導電膜同士の間の法線方向の間隙の最大間隔より大きい、請求項1から10のいずれか1項に記載の半導体装置。
- 前記ガードリングに沿って設けられる領域を含む前記導電膜は、前記ガードリングに沿ってすべて断続的に設けられる、請求項1から11のいずれか1項に記載の半導体装置。
- 前記ガードリングに沿って設けられる領域を含む前記導電膜において、
最外周に位置する前記ガードリングと前記第2層間絶縁膜との間の位置に設けられる前記導電膜は、前記ガードリングに沿って連続的に設けられ、
最外周に位置する前記ガードリングより内側に位置する前記導電膜は、前記ガードリングに沿って断続的に設けられる、請求項1から11のいずれか1項に記載の半導体装置。 - 前記導電膜の法線方向の幅は、前記導電膜と電気的に接続されている前記ガードリングの法線方向の幅より小さい、請求項1から13のいずれか1項に記載の半導体装置。
- 前記導電膜は、前記第1層間絶縁膜を厚さ方向に貫通する前記コンタクトホールの内部にのみ設けられる、請求項1から13のいずれか1項に記載の半導体装置。
- 前記導電膜は、前記コンタクトホールの内部にWプラグをさらに含み、前記Wプラグを通じて前記ガードリングと電気的に接続される、請求項1から15のいずれか1項に記載の半導体装置。
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KR1020100018809A KR101209568B1 (ko) | 2009-05-12 | 2010-03-03 | 반도체장치 |
DE102010011112A DE102010011112A1 (de) | 2009-05-12 | 2010-03-12 | Halbleitervorrichtung |
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