Patent ID: 9076761
Filing Date: 2015-07-07
Classification: H01L

Abstract:
1. A silicon carbide semiconductor device comprising: a drift layer having a first conductivity type and made of silicon carbide; a base region having a second conductivity type and selectively formed in a superficial layer of said drift layer; a source region having the first conductivity type and selectively formed in a superficial layer of said base region; a source electrode selectively formed on said source region; a gate insulating film formed so as to extend over said drift layer, said base region, and an area of said source region where said source electrode is not formed; and a gate electrode formed on said gate insulating film, said source region including a first source region and a second source region, said first source region being arranged below said source electrode, said second source region being arranged below said gate electrode and formed so as to surround said first source region in a plan view, a doping concentration in a superficial layer of said second source region being lower than a doping concentration in a superficial layer of said first source region, a doping concentration in said second source region being higher in a deep portion than in a superficial portion thereof.