Patent ID: 8981385
Filing Date: 2015-03-17
Classification: H01L

Abstract:
1. A silicon carbide semiconductor device, comprising a silicon carbide substrate composed of an element region provided with a semiconductor element portion and a termination region surrounding said element region as viewed in a plan view, said semiconductor element portion including a drift region having a first conductivity type, said termination region including a ratio calculated by dividing a width of said first electric field relaxing region by a thickness of said drift region being not less than 0.5 and not more than 1.83, wherein said second electric field relaxing region includes a plurality of guard ring portions, and wherein, in a case where any two guard ring portions are selected from among said plurality of guard ring portions, the guard ring portion arranged on an outer peripheral side as viewed in the plan view has a width which is not more than that of the guard ring portion arranged on an inner peripheral side, and the guard ring portion arranged on an outermost peripheral side has a width which is smaller than that of the guard ring portion arranged on an innermost peripheral side.