Patent ID: 8421086
Filing Date: 2013-04-16
Classification: H01L

Abstract:
1. A silicon carbide semiconductor device comprising: a substrate made of silicon carbide and having an off angle of not less than 50° and not more than 65° with respect to a plane orientation {0001}; a buffer layer made of silicon carbide and formed on said substrate; and an active layer made of silicon carbide and formed on said buffer layer, and a micropipe density being lower in said active layer than in said substrate, and a density of dislocations in which a direction of a Burgers vector corresponds to [0001] being higher in said active layer than in said substrate; wherein a density of basal plane dislocations in which a direction of a Burgers vector corresponds to [11-20] and a direction of a dislocation line substantially corresponds to [11-20] is lower in said active layer than in said substrate, and a density of edge dislocations in which a direction of a Burgers vector corresponds to [11-20] and a direction of a dislocation line substantially corresponds to [0001] is higher in said active layer than in said substrate.