Patent ID: 9006748
Filing Date: 2015-04-14
Classification: H01L,Y10S

Abstract:
1. A semiconductor device comprising a silicon carbide layer of a first conductivity type, the silicon carbide layer having a first principal surface and a second principal surface and including an element region and a terminal region which surrounds the element region on the first principal surface, wherein the silicon carbide layer includes: a first dopant layer of the first conductivity type which contacts with the first principal surface; a second dopant layer of the first conductivity type which is located closer to the second principal surface than the first dopant layer is; and a third dopant layer of the first conductivity type which is located between the first and second dopant layers and has a lower dopant concentration than the second dopant layer and, the terminal region has, in its surface portion with a predetermined depth as measured from the first principal surface, a terminal structure which includes a portion of the first dopant layer, a portion of the second dopant layer, and a ring region of a second conductivity type that runs through the first and third dopant layers to reach the second dopant layer, the dopant concentration of the first dopant layer is twice to five times as high as the dopant concentration of the second dopant layer, when viewed along a normal to the first principal surface, the first dopant layer is arranged to contact with the ring region both inside and outside of the region.