JP4825424B2 - 電力用半導体装置 - Google Patents
電力用半導体装置 Download PDFInfo
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- JP4825424B2 JP4825424B2 JP2005010480A JP2005010480A JP4825424B2 JP 4825424 B2 JP4825424 B2 JP 4825424B2 JP 2005010480 A JP2005010480 A JP 2005010480A JP 2005010480 A JP2005010480 A JP 2005010480A JP 4825424 B2 JP4825424 B2 JP 4825424B2
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- 239000004065 semiconductor Substances 0.000 title claims description 89
- 239000000758 substrate Substances 0.000 claims description 44
- 230000000903 blocking effect Effects 0.000 claims description 30
- 239000012535 impurity Substances 0.000 claims description 12
- 230000000737 periodic effect Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 230000015556 catabolic process Effects 0.000 description 17
- 238000000034 method Methods 0.000 description 13
- 238000009792 diffusion process Methods 0.000 description 8
- 150000002500 ions Chemical class 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 4
- 238000005530 etching Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- -1 boron ions Chemical class 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Description
基板面に沿って形成される第1の主電極と、
前記第1の主電極に電気的に接続される第1導電型の第1半導体層と、
前記第1半導体層上に形成され、基板面に沿って交互に周期的に形成される第1導電型の第2半導体層および第2導電型の第3半導体層からなる周期構造部と、
前記第2および第3半導体層上の一部に選択的に形成される第2導電型の第4半導体層と、
前記第4半導体層上に選択的に形成される第1導電型の第5半導体層と、
前記第4および第5半導体層に接合される第2の主電極と、
前記第2、第4および前記第5半導体層上に第1絶縁膜を介して隣接配置される制御電極と、
前記第2および第3半導体層からなる周期構造領域の外側に形成され、空乏層の広がりを防止する空乏層遮断部と、
前記第3半導体層と同一材料で形成され、基板端部まで前記第2および第3半導体層の表面を覆うように形成される第2導電型の第6半導体層と、を備え、
前記空乏層遮断部は、
前記第3半導体層の形成領域の外側に形成される第1トレンチと、
前記第1トレンチ内に第2絶縁膜を介して形成される導電層と、を有し、
前記空乏層遮断部は、基板端部において前記第6半導体層を分断して前記第2半導体層に達する深さまで形成される。
また、本発明の一態様に係る電力用半導体装置は、
基板面に沿って形成される第1の主電極と、
前記第1の主電極に電気的に接続される第1導電型の第1半導体層と、
前記第1半導体層上に形成され、基板面に沿って交互に周期的に形成される第1導電型の第2半導体層および第2導電型の第3半導体層からなる周期構造部と、
前記第2および第3半導体層上の一部に選択的に形成される第2導電型の第4半導体層と、
前記第4半導体層上に選択的に形成される第1導電型の第5半導体層と、
前記第4および第5半導体層に接合される第2の主電極と、
前記第2、第4および前記第5半導体層上に第1絶縁膜を介して隣接配置される制御電極と、
前記第2および第3半導体層からなる周期構造領域の外側に形成され、空乏層の広がりを防止する空乏層遮断部と、
前記第3半導体層と同一材料で形成され、基板端部まで前記第2および第3半導体層の表面を覆うように形成される第2導電型の第6半導体層と、
前記第4半導体層と前記第6半導体層との間に形成され、前記第4半導体層よりも不純物濃度の低い第2導電型の第7半導体層と、を備え、
前記空乏層遮断部は、
前記第3半導体層の形成領域の外側に形成される第1トレンチと、
前記第1トレンチ内に第2絶縁膜を介して形成される導電層と、を有する。
図1は本発明の一実施形態に係るパワーMOSFETの断面構造を示す断面図である。図1のパワーMOSFETは、基板面に沿って形成されるドレイン電極1と、ドレイン電極1上に形成されるn+ドレイン層2と、n+ドレイン層2上に形成されるスーパージャンクション構造のドリフト層3と、ドリフト層3上の一部に選択的に形成されるpベース層4と、pベース層4上に選択的に形成されるn+ソース層5と、pベース層4およびn+ソース層5上に形成されるソース電極6と、ドリフト層3、pベース層4およびn+ソース層5にゲート絶縁膜7を介して隣接配置されるゲート電極8と、ドリフト層3の端部に形成され空乏層の広がりを防止する空乏層遮断部9とを備えている。
第2の実施形態は、空乏層遮断部9の構造が第1の実施形態と異なる点に特徴がある。
第3の実施形態は、第1の実施形態の変形例であり、pベース層4を基板表面のp型エピタキシャル成長層23よりも薄く形成した点に特徴がある。
第4の実施形態は、pベース層4と基板端部表面のp型エピタキシャル成長層23との間にRESURF層を形成する点に特徴がある。
第5の実施形態は、ゲート電極8の配置に特徴があるものであり、上述した第1〜第4の実施形態に適用可能である。
第6の実施形態は、第1の実施形態の変形例であり、複数の空乏層遮断部9を形成することに特徴がある。
上述した実施形態において、各層の導電型を逆にしてもよい。すなわちp型をn型に、n型をp型にしてもよい。
2 n+ドレイン層
3 ドリフト層
4 pベース層
5 n+ソース層
6 ソース電極
7 ゲート絶縁膜
8,8a,8b ゲート電極
9,9a,9b,9c 空乏層遮断部
9 空乏層遮断部
11 nピラー層
12 pピラー層
14 フィールドストップ電極
21 n型エピタキシャル層
22 トレンチ溝
23 p型エピタキシャル成長層
24 第1トレンチ
25 第2トレンチ
31 拡散層
32 RESURF層
Claims (5)
- 基板面に沿って形成される第1の主電極と、
前記第1の主電極に電気的に接続される第1導電型の第1半導体層と、
前記第1半導体層上に形成され、基板面に沿って交互に周期的に形成される第1導電型の第2半導体層および第2導電型の第3半導体層からなる周期構造部と、
前記第2および第3半導体層上の一部に選択的に形成される第2導電型の第4半導体層と、
前記第4半導体層上に選択的に形成される第1導電型の第5半導体層と、
前記第4および第5半導体層に接合される第2の主電極と、
前記第2、第4および前記第5半導体層上に第1絶縁膜を介して隣接配置される制御電極と、
前記第2および第3半導体層からなる周期構造領域の外側に形成され、空乏層の広がりを防止する空乏層遮断部と、
前記第3半導体層と同一材料で形成され、基板端部まで前記第2および第3半導体層の表面を覆うように形成される第2導電型の第6半導体層と、を備え、
前記空乏層遮断部は、
前記第3半導体層の形成領域の外側に形成される第1トレンチと、
前記第1トレンチ内に第2絶縁膜を介して形成される導電層と、を有し、
前記空乏層遮断部は、基板端部において前記第6半導体層を分断して前記第2半導体層に達する深さまで形成されることを特徴とする電力用半導体装置。 - 基板面に沿って形成される第1の主電極と、
前記第1の主電極に電気的に接続される第1導電型の第1半導体層と、
前記第1半導体層上に形成され、基板面に沿って交互に周期的に形成される第1導電型の第2半導体層および第2導電型の第3半導体層からなる周期構造部と、
前記第2および第3半導体層上の一部に選択的に形成される第2導電型の第4半導体層と、
前記第4半導体層上に選択的に形成される第1導電型の第5半導体層と、
前記第4および第5半導体層に接合される第2の主電極と、
前記第2、第4および前記第5半導体層上に第1絶縁膜を介して隣接配置される制御電極と、
前記第2および第3半導体層からなる周期構造領域の外側に形成され、空乏層の広がりを防止する空乏層遮断部と、
前記第3半導体層と同一材料で形成され、基板端部まで前記第2および第3半導体層の表面を覆うように形成される第2導電型の第6半導体層と、
前記第4半導体層と前記第6半導体層との間に形成され、前記第4半導体層よりも不純物濃度の低い第2導電型の第7半導体層と、を備え、
前記空乏層遮断部は、
前記第3半導体層の形成領域の外側に形成される第1トレンチと、
前記第1トレンチ内に第2絶縁膜を介して形成される導電層と、を有することを特徴とする電力用半導体装置。 - 前記第2、第4および第5半導体層に形成される前記第1トレンチと略同一深さの第2トレンチを備え、
前記第1絶縁膜および前記制御電極は、前記第2トレンチ内に形成されることを特徴とする請求項1に記載の電力用半導体装置。 - 前記第2、第4および第5半導体層に形成される前記第1トレンチと略同一深さの第2トレンチを備え、
前記第1絶縁膜および前記制御電極は、前記第2トレンチ内に形成されることを特徴とする請求項2に記載の電力用半導体装置。 - 前記空乏層遮断部は、前記周期構造部を取り囲むように形成されることを特徴とする請求項1乃至4のいずれかに記載の電力用半導体装置。
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