JP3185292B2 - 半導体装置 - Google Patents
半導体装置Info
- Publication number
- JP3185292B2 JP3185292B2 JP32792591A JP32792591A JP3185292B2 JP 3185292 B2 JP3185292 B2 JP 3185292B2 JP 32792591 A JP32792591 A JP 32792591A JP 32792591 A JP32792591 A JP 32792591A JP 3185292 B2 JP3185292 B2 JP 3185292B2
- Authority
- JP
- Japan
- Prior art keywords
- gate electrode
- electrode pad
- layer
- well layer
- oxide film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000004065 semiconductor Substances 0.000 title claims 4
- 239000000758 substrate Substances 0.000 claims 2
- 239000007772 electrode material Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 description 28
- 230000003071 parasitic effect Effects 0.000 description 7
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 5
- 229920005591 polysilicon Polymers 0.000 description 5
- 239000011229 interlayer Substances 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a 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 specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a 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
- H01L29/10—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 with semiconductor regions connected to an electrode not carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- H01L29/1095—Body region, i.e. base region, of DMOS transistors or IGBTs
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Insulated Gate Type Field-Effect Transistor (AREA)
- Semiconductor Integrated Circuits (AREA)
Description
関し、特にゲート電極パッド部下の構造に関する。
電極パッドの下は図3に示すようにPウエル層が形成さ
れていた。
電極パッド部近傍の断面図を示す。図において、1はド
レインとなるN- 層,2はチャンネルを形成するP層,
3はソースとなるN+ 層,4はゲート酸化膜,5はポリ
シリコンゲート,6は層間絶縁膜,7はゲート電極パッ
ド,8はソース電極,9はゲート電極パッド下のPウエ
ル層,10はフィールド酸化膜である。ここでPウエル
層9はドレイン−ソース間に逆電圧印加時にゲート電極
パッド下のN- 層1での空乏層の広がりを安定にし、逆
耐圧向上のために形成している。
接するMOSFETの1セルの断面を示しており、MO
SFETのセルは互いに隣接して多数形成され(図示せ
ず)電気的にはパラレルに接続して大電流容量のFET
として動作する。
SFETはゲート電極パッド部7の下に形成されたPウ
エル層9が、パワーMOSFETをスイッチング動作さ
せた場合、オフ時,すなわちPウエル−N- 接続の内部
寄生ダイオードがが逆回復するとき、転流dVDS/dt
が発生し、このときゲート電極部の下に形成されたPウ
エル層9に蓄積されていたホールが隣接するMOSFE
Tのセル部に注入され、それに基づきN-−P−N+ 接
続の寄生バイポーラトランジスタがオンし、逆電流の集
中が1セルに起こり、セル部が破壊に至るという欠点が
あった。
FETはゲート電極パッド下に形成していたPウエル層
を除いた構造を特徴とするものである。すなわち、第1
手段としてN- 層1の上に酸化膜4を介しポリシリコン
5と接続したゲート電極パッドを形成する構造である。
また、第2手段としN- 層の一部にセルと近接したPウ
エル層19をリング状に形成し、さらに酸化膜4を介し
ポリシリコン5と接続したゲート電極パッドを形成する
構造である。
Tをスイッチング動作させた場合、ゲート電極パッド下
の寄生ダイオードがないため、オフ時にセル部への電流
集中が発生しなくなり、dVDS/dtの耐量が向上す
る。
SFETをスイッチング動作させた場合、ゲート電極パ
ッド下の寄生ダイオードの容量が小さくなり、オフ時に
セル部への電流集中が小さくなり、dVDS/dtの耐量
が向上する。
照して説明する。
ワーMOSFETのゲート電極パッド部近傍の断面図で
ある。図において1はドレインとなるN- 層,2はチャ
ンネルを形成するP層,3はソースとなるN+ 層,4は
ゲート酸化膜,5はポリシリコンゲート,6は層間絶縁
膜,7はゲート電極パッド,8はソース電極,10はフ
ィールド酸化膜である。
下のPウエル層がないため、スイッチング動作させた場
合、オフ時にゲート電極パッドに隣接するセル部の寄生
パイポーラトランジスタがオンしなくなり、よって電流
の集中が発生しなくなり、dVDS/dtの耐量が向上す
る。
面図である。この実施例は前記第1手段の一実施例に加
えて、ゲート電極パッド部7の下の周辺にリング状にセ
ル部に近接してPウエル層19を形成した点を除いて第
1手段の実施例と同様であるため、同一部分には同一参
照符号を付してその説明を省略する。
べ、ドレイン−ソース間に逆電圧を印加した場合、ゲー
ト電極下の空乏層の広がりが安定し、ドレイン−ソース
間の耐圧が安定する利点がある。
電極下のPウエル層19が小さいため、ゲート電極パッ
ド下のPウエル−N- 接続の寄生ダイオードの容量が小
さくなり、スイッチング動作させた場合、オフ時にゲー
ト電極パッドに隣接するセル部の寄生パイポーラトラン
ジスタがオンしにくくなり、よって電流の集中が弱くな
り、dVDS/dtの耐量が向上する。
電極パッド下のPウエル層を全部または大部分を除くこ
とにより、dVDS/dtの大量を改善できる効果があ
る。
下の近接するセルに電流集中が発生しないため、dVDS
/dtの耐量が改善される。
近接するセルに電流が集中しにくくなり、dVDS/dt
の耐量が改善される。
ウエル層19により安定する利点もある。
ゲート電極パッド部近傍の断面図
Claims (1)
- 【請求項1】セルが互いに隣接して形成されたパワーM
OSFETのドレインとして作用する一導電型半導体基
板上にフィールド酸化膜を介しゲート電極材料を配し、
その上にゲート電極パッドを形成し、ゲート電極パッド
の直下位置の半導体基板内にリング状の他導電型ウエル
層を形成し、前記セルのうち一部のセルがゲート電極パ
ッドに隣接した半導体装置。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32792591A JP3185292B2 (ja) | 1991-12-12 | 1991-12-12 | 半導体装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32792591A JP3185292B2 (ja) | 1991-12-12 | 1991-12-12 | 半導体装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05167070A JPH05167070A (ja) | 1993-07-02 |
JP3185292B2 true JP3185292B2 (ja) | 2001-07-09 |
Family
ID=18204539
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP32792591A Expired - Fee Related JP3185292B2 (ja) | 1991-12-12 | 1991-12-12 | 半導体装置 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3185292B2 (ja) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69321966T2 (de) * | 1993-12-24 | 1999-06-02 | Cons Ric Microelettronica | Leistungs-Halbleiterbauelement |
US5798287A (en) * | 1993-12-24 | 1998-08-25 | Consorzio Per La Ricerca Sulla Microelettronica Nel Mezzogiorno | Method for forming a power MOS device chip |
DE69321965T2 (de) * | 1993-12-24 | 1999-06-02 | Cons Ric Microelettronica | MOS-Leistungs-Chip-Typ und Packungszusammenbau |
JPH08274321A (ja) * | 1995-03-31 | 1996-10-18 | Rohm Co Ltd | 半導体装置 |
EP2383790B1 (en) | 2001-04-04 | 2019-07-24 | Mitsubishi Denki Kabushiki Kaisha | Semiconductor device with a drain region underlying a gate contact pad |
KR101269795B1 (ko) | 2008-12-25 | 2013-05-30 | 미쓰비시덴키 가부시키가이샤 | 전력용 반도체 장치 |
JP5719976B2 (ja) * | 2013-03-31 | 2015-05-20 | 新電元工業株式会社 | 半導体装置 |
WO2014163060A1 (ja) * | 2013-03-31 | 2014-10-09 | 新電元工業株式会社 | 半導体装置 |
JP6422906B2 (ja) | 2016-03-11 | 2018-11-14 | 株式会社東芝 | 半導体装置 |
JP2017076803A (ja) * | 2016-11-11 | 2017-04-20 | 株式会社東芝 | 半導体素子 |
-
1991
- 1991-12-12 JP JP32792591A patent/JP3185292B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH05167070A (ja) | 1993-07-02 |
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