SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING SEMICONDUCTOR DEVICE
PROBLEM TO BE SOLVED: To provide: a semiconductor device arranged by use of a SiC semiconductor, by which the decrease in gate threshold voltage can be suppressed; and a method for manufacturing the semiconductor device.SOLUTION: In a SiC-MOSFET, a MOS gate structure and a front-face electrode 13 ar...
Saved in:
Main Authors | , , , |
---|---|
Format | Patent |
Language | English Japanese |
Published |
07.09.2017
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | PROBLEM TO BE SOLVED: To provide: a semiconductor device arranged by use of a SiC semiconductor, by which the decrease in gate threshold voltage can be suppressed; and a method for manufacturing the semiconductor device.SOLUTION: In a SiC-MOSFET, a MOS gate structure and a front-face electrode 13 are provided on a front face side of an epitaxial substrate arranged by depositing an nepitaxial layer 2 on a front face of a SiC substrate 1, the MOS gate structure including a p base region 3, a p epitaxial layer 4, an nsource region 5, a pcontact region 6, an n leading back region 7, a gate insulative film 8 and a gate electrode 9. On a surface of the front-face electrode 13, a first metal film 21 is provided in a region of 10% or more of the surface of the front-face electrode 13, preferably a region of 60-90%. Such a SiC-MOSFET is produced by forming the first metal film 21 on the surface of the front-face electrode 13 after formation of a backside electrode 15, followed by annealing under a Natmosphere.SELECTED DRAWING: Figure 1
【課題】SiC半導体を用いた半導体装置において、ゲートしきい値電圧の低下を抑制することができる半導体装置および半導体装置の製造方法を提供すること。【解決手段】SiC基板1のおもて面上にn-エピタキシャル層2を堆積してなるエピタキシャル基板のおもて面側に、pベース領域3、pエピタキシャル層4、n++ソース領域5、p+コンタクト領域6、n打ち返し領域7、ゲート絶縁膜8およびゲート電極9からなるMOSゲート構造と、おもて面電極13とが設けられている。おもて面電極13の表面上には、おもて面電極13の表面の10%以上の領域、好ましくは60%以上90%以下の領域に、第1金属膜21が設けられている。このようなSiC−MOSFETは、裏面電極15の形成後、おもて面電極13の表面に第1金属膜21を形成し、N2雰囲気のアニールを行うことで作製される。【選択図】図1 |
---|---|
Bibliography: | Application Number: JP20170091469 |