JP2020017673A - 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 85
- 238000009792 diffusion process Methods 0.000 claims abstract description 111
- 230000002093 peripheral effect Effects 0.000 claims abstract description 18
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 239000012535 impurity Substances 0.000 claims description 27
- 230000015556 catabolic process Effects 0.000 abstract description 16
- 230000005684 electric field Effects 0.000 description 69
- 238000000034 method Methods 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000059 patterning Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- -1 silane compound Chemical class 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 238000001947 vapour-phase growth Methods 0.000 description 1
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Abstract
Description
図1(a)は、本実施の形態に係る半導体装置1の構成を示す平面図、図1(b)は、図1(a)におけるX−X線に沿った断面図である。本実施の形態において、半導体装置1は、矩形形状の主面を有するプレーナ型でかつNPN型のバイポーラトランジスタを構成している。
換言すると、空乏層を停止させたN型拡散層54は電界の集中領域(電界が高い領域、以下「電界集中領域」という場合がある)の1つを構成している。そして、電界集中領域を構成するN型拡散層54は、特定方向の長さを長くすることによってさらに電界の集中を緩和することができる。
換言すれば、フィールドプレートの幅を広げることは有効な耐圧向上の手段となるが、単純に拡幅したのではチップサイズの拡大をもたらす。そこで本実施の形態では、緩やかな弧状に形成している屈曲部62を有効に活用し、レイアウト面積の増大を招くことなく耐圧の向上を図っている。
図3を参照して、本実施の形態に係る半導体装置について説明する。本実施の形態に係る半導体装置は、上述した半導体装置1の電界緩和構造体50を電界緩和構造体50aに置き換えたものであり、半導体装置の構成は図1と同様である。従って、必要な場合は図1を参照することとし詳細な説明を省略する。図3に示す電界緩和構造体50aは、環状の電界緩和構造体50aのうちの図1(a)に示す領域Sの部分を示している。なお、図1(a)に示す領域S以外の3つの角部(コーナー部)についても図3と同様の構成の電界緩和構造体50aが配置されている。
図4を参照して本実施の形態に係る半導体装置について説明する。本実施の形態に係る半導体装置は、上述した半導体装置1の電界緩和構造体50を電界緩和構造体50bに置き換えたものであり、半導体装置の構成は図1と同様である。従って、必要な場合は図1を参照することとし詳細な説明を省略する。図4に示す電界緩和構造体50bは、環状の電界緩和構造体50bのうちの図1(a)に示す領域Sの部分を示している。なお、図1(a)に示す領域S以外の3つの角部(コーナー部)についても図4と同様の構成の電界緩和構造体50bが配置されている。
本実施の形態に係る半導体装置ではさらに、屈曲部62のN型拡散層54bを低濃度領域54b−2とし、直線部60のN型拡散層54bを高濃度領域54b−2として、屈曲部62におけるN型拡散層54bの不純物濃度を、直線部60におけるN型拡散層54bの不純物濃度より低くしている。このことにより、電界緩和構造体50bのコーナー部に生じる電界集中を緩和し、フィールドプレートの面積の増加を抑制しつつ、電界集中により耐圧の低下を生じやすいコーナー部の耐圧の向上を実現することが可能となっている。
11 コレクタ層
12 エピタキシャル層
13 ベース拡散層
14 エミッタ拡散層
15 エミッタ電極
16 ベース電極
16a ボンディングパッド
17 絶縁膜
18 主面
50、50a 電界緩和構造体
52 P型拡散層
54、54a、54b N型拡散層
54a−1、54b−1 高濃度領域
54a−2、54b−2 低濃度領域
56 フィールドプレート
58 コンタクト
60 直線部
62、62a 屈曲部
A1 活性領域
A2 不活性領域
P1〜P3 領域
S 領域
Claims (9)
- 主面にセル領域と前記セル領域を囲む外周領域とを備えた第1導電型の半導体基板と、 前記外周領域内に配置され、前記セル領域を囲む前記第1導電型とは異なる第2導電型の第1拡散層と、
前記外周領域内に配置され、絶縁部材に設けられた開口部を介して前記主面に接するとともに前記第1拡散層に接続された電極と、
前記主面に対し垂直な方向から見た場合に前記電極に内包される領域の前記主面に前記第1拡散層から離間して形成され、かつ第1の幅を有する直線部と前記第1の幅より広い第2の幅の部分を有する屈曲部とを含む前記第1導電型の第2拡散層と、
を備えることを特徴とする半導体装置。 - 前記第2拡散層の不純物濃度は前記半導体基板の不純物濃度より高い
請求項1に記載の半導体装置。 - 前記電極が前記セル領域の周囲を囲んで配置された
請求項1または請求項2に記載の半導体装置。 - 前記第2拡散層が前記第1拡散層の周囲を囲んで配置された
請求項1から請求項3のいずれか1項に記載の半導体装置。 - 前記直線部は第1の不純物濃度を有し、前記屈曲部は前記第1の不純物濃度より低い第2の不純物濃度を有する
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。 - 主面にセル領域と前記セル領域を囲む外周領域とを備えた第1導電型の半導体基板と、 前記外周領域内に配置され、前記セル領域を囲む前記第1導電型とは異なる第2導電型の第1拡散層と、
前記外周領域内に配置され、絶縁部材に設けられた開口部を介して前記主面に接するとともに前記第1拡散層に接続された電極と、
前記主面に対し垂直な方向から見た場合に前記電極に内包される領域の前記主面に前記第1拡散層から離間して形成され、かつ第1の不純物濃度を有する直線部と、前記第1の不純物濃度より低い第2の不純物濃度の部分を有する屈曲部とを含む前記第1導電型の第2拡散層と、
を備えることを特徴とする半導体装置。 - 前記第2拡散層の不純物濃度は前記半導体基板の不純物濃度より高い
請求項6に記載の半導体装置。 - 前記電極が前記セル領域の周囲を囲んで配置された
請求項6または請求項7に記載の半導体装置。 - 前記第2拡散層が前記第1拡散層の周囲を囲んで配置された
請求項6から請求項8のいずれか1項に記載の半導体装置。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2018140560A JP7201288B2 (ja) | 2018-07-26 | 2018-07-26 | 半導体装置 |
US16/516,272 US10964780B2 (en) | 2018-07-26 | 2019-07-19 | Semiconductor device |
CN201910654076.9A CN110783396B (zh) | 2018-07-26 | 2019-07-19 | 半导体装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP2018140560A JP7201288B2 (ja) | 2018-07-26 | 2018-07-26 | 半導体装置 |
Publications (2)
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JP2020017673A true JP2020017673A (ja) | 2020-01-30 |
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