JP6573107B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP6573107B2 JP6573107B2 JP2015159734A JP2015159734A JP6573107B2 JP 6573107 B2 JP6573107 B2 JP 6573107B2 JP 2015159734 A JP2015159734 A JP 2015159734A JP 2015159734 A JP2015159734 A JP 2015159734A JP 6573107 B2 JP6573107 B2 JP 6573107B2
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- 239000004065 semiconductor Substances 0.000 title claims description 58
- 239000000758 substrate Substances 0.000 claims description 24
- 230000002093 peripheral effect Effects 0.000 claims description 16
- 239000012535 impurity Substances 0.000 claims description 8
- 239000010410 layer Substances 0.000 description 44
- 230000015556 catabolic process Effects 0.000 description 7
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7811—Vertical DMOS transistors, i.e. VDMOS transistors with an edge termination structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/0603—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions
- H01L29/0607—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration
- H01L29/0611—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices
- H01L29/0615—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices by the doping profile or the shape or the arrangement of the PN junction, or with supplementary regions, e.g. junction termination extension [JTE]
- H01L29/0619—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices by the doping profile or the shape or the arrangement of the PN junction, or with supplementary regions, e.g. junction termination extension [JTE] with a supplementary region doped oppositely to or in rectifying contact with the semiconductor containing or contacting region, e.g. guard rings with PN or Schottky junction
- H01L29/0623—Buried supplementary region, e.g. buried guard ring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/402—Field plates
- H01L29/404—Multiple field plate structures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/402—Field plates
- H01L29/407—Recessed field plates, e.g. trench field plates, buried field plates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7813—Vertical DMOS transistors, i.e. VDMOS transistors with trench gate electrode, e.g. UMOS transistors
Description
本発明の半導体装置は、第1導電型の半導体基板に活性領域と活性領域を囲む外周領域とを含み、外周領域内には、外側トレンチと、外側トレンチ内に配置され、半導体基板と電気的に絶縁され、フローティング電位の外側電極と、半導体基板の上面に活性領域から延びる第2導電型の半導体領域が形成されておらず、隣り合う外側トレンチ間を繋ぐように、外側トレンチの側面に隣接して形成された第2導電型のフローティング領域とを備えることを特徴とする。
更に、n−層20と外側電極120との間の絶縁膜との界面から空乏層が広がり、外周領域300において空乏層が縦方向(半導体基板2の厚み方向)に良好に広がる。
これらの空乏層の広がりによって、図2で示すようになだらかな等電位線となる。従って、外周領域300における電界集中を緩和し、半導体装置1の耐圧を向上することができる。
また、最も外側にあるフローティング領域140はフィールドプレート電極130よりも外側まで延伸していることが望ましい。下方に設けられたフローティング領域140と上方に設けられたフィールドプレート電極130の両方の効果によって、最も外側の外側トレンチ110の側面及び角部における電界集中を緩和し、半導体装置1の耐圧を更に向上することができる。
2 半導体基板
10 N+層
20 n−層
30 p―層
40 n+層
50 補助電極
60 ゲート電極
70 層間絶縁膜
80 ソース電極(第1の主電極)
90 ドレイン電極(第2の主電極)
100 溝
110 外側トレンチ
120 外側電極
130 フィールドプレート電極
140 フローティング領域
Claims (6)
- 第1導電型の半導体基板に活性領域と活性領域を囲む外周領域とを含み、
前記外周領域内には、
外側トレンチと、
前記外側トレンチ内に配置され、前記半導体基板と電気的に絶縁され、フローティング電位の外側電極と、
前記半導体基板の上面に前記活性領域から延びる第2導電型の半導体領域が形成されておらず、隣り合う前記外側トレンチ間を繋ぐように、前記外側トレンチの側面に隣接して形成された第2導電型のフローティング領域とを備えることを特徴とする半導体装置。 - 第1導電型の半導体基板に活性領域と活性領域を囲む外周領域とを含み、
前記外周領域内には、
外側トレンチと、
前記外側トレンチ内に配置され、前記半導体基板と電気的に絶縁された外側電極と、
前記外側トレンチの側面に隣接して形成された第2導電型のフローティング領域とを備え、
前記外側トレンチの側壁に接する前記フローティング領域の厚みより前記外側トレンチの側壁から離間した領域における前記フローティング領域の厚みが大きいことを特徴とする半導体装置。 - 前記フローティング領域の上面は前記半導体基板の上面に達しておらず、
前記半導体基板上を前記外側トレンチよりも外側へ延伸するように、前記電極と電気的に接続されたフィールドプレートとを備えることを特徴とする請求項1又は2の半導体装置。 - 前記半導体基板上を前記外側トレンチよりも外側へ延伸するように、前記電極と電気的に接続されたフィールドプレートを更に備え、
前記フローティング領域は前記フィールドプレートよりも外側へ延伸することを特徴とする請求項1又は2の半導体装置。 - 前記外側トレンチは複数離間して設けられており、
前記外側トレンチ間の各々には前記フローティング領域が配置されており、
前記半導体基板を上方から見て前記複数の外側トレンチの中で前記活性領域側に配置された前記外側トレンチ間の前記フローティング領域の不純物濃度の最大値は、前記複数の外側トレンチの中で外周側に配置された前記外側トレンチ間の前記フローティング領域の不純物濃度の最大値よりも高いことを特徴とする請求項1〜4何れか1項に記載の半導体装置。 - 前記電極はフローティング電位又はソース電極と電気的に接続された電位であることを特徴とする請求項1〜5何れか1項に記載の半導体装置。
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WO2022011834A1 (zh) * | 2020-07-13 | 2022-01-20 | 苏州东微半导体有限公司 | 半导体功率器件的终端结构及其制造方法 |
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CN110838486B (zh) * | 2018-08-17 | 2023-04-07 | 力智电子股份有限公司 | 功率晶体管元件 |
WO2022162894A1 (ja) * | 2021-01-29 | 2022-08-04 | サンケン電気株式会社 | 半導体装置 |
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JPH09283754A (ja) * | 1996-04-16 | 1997-10-31 | Toshiba Corp | 高耐圧半導体装置 |
JPH1187698A (ja) * | 1997-09-02 | 1999-03-30 | Kansai Electric Power Co Inc:The | 高耐圧半導体装置及びこの装置を用いた電力変換器 |
JP2007123570A (ja) * | 2005-10-28 | 2007-05-17 | Toyota Industries Corp | 半導体装置 |
JP5188037B2 (ja) * | 2006-06-20 | 2013-04-24 | 株式会社東芝 | 半導体装置 |
CN102318045B (zh) * | 2008-02-14 | 2014-08-06 | 马克斯半导体股份有限公司 | 改良式击穿电压的边缘端点 |
US8575685B2 (en) * | 2011-08-25 | 2013-11-05 | Alpha And Omega Semiconductor Incorporated | Buried field ring field effect transistor (BUF-FET) integrated with cells implanted with hole supply path |
JP2013069866A (ja) * | 2011-09-22 | 2013-04-18 | Toshiba Corp | 半導体装置 |
JP6208579B2 (ja) * | 2013-12-26 | 2017-10-04 | トヨタ自動車株式会社 | 半導体装置 |
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