Patent ID: 9722017
Date: 2017-08-01
CPC Classifications: H01L

Claim:
1. A silicon carbide semiconductor device, comprising: a silicon carbide substrate of a first conductivity type; a drift layer of the first conductivity type that is formed on said silicon carbide substrate and is doped with a dopant; and a plurality of body regions of a second conductivity type located at an interval from each other in a surface layer of said drift layer, wherein said plurality of body regions sandwich a region in the surface layer of said drift layer, and the region is a JFET region, said JFET region and said body region are cyclically formed, a surface of said drift layer is a lower surface of said body region, a doping concentration N where V [V] represents a rated breakdown voltage, said drift layer includes a breakdown voltage holding layer that extends from the surface of said drift layer in a film thickness direction and that has a film thickness of d [μm], said breakdown voltage holding layer has a film thickness d [μm] in a range expressed by the doping concentration, which is greater than or equal to 3×10 when 0≦x<d when d and by using the ideal doping concentration distribution h (N where an x axis direction represents said film thickness direction, x=0 [μm] represents the surface of said drift layer, x=d [μm] represents the point of the depth d [μm] from the surface of said drift layer, d