Patent ID: 6133587
Filing Date: 2000-10-17
Classification: H01L

Abstract:
A silicon carbide semiconductor device, comprising:a single crystal silicon carbide semiconductor substrate comprising a stack of a first semiconductor layer of a first conductive-type, a second embodiment layer of the first conductive-layer having an electric resistance higher than that of said first semiconductor layer, and a third semiconductor layer of a second conductive-type different from the first conductive-type in this order from the bottom to the top thereof, and single crystal silicon carbide semiconductor substrate having a main surface on a side of said third semiconductor layer;a first semiconductor region of the first conductive-type formed in a predetermined region of said third semiconductor layer;a trench extending from said main surface through said first semiconductor region and said third semiconductor layer and reaching said second semiconductor layer, said trench having a side wall exposing said first semiconductor region and said third semiconductor layer and a bottom exposing said second semiconductor layer;an island semiconductor region comprising said first semiconductor region and said third semiconductor layer and entirely surrounded by said trench so as to be separated from any other island semiconductor regions;a gate insulating layer formed on the side wall of said island semiconductor region;a gate electrode layer formed on said gate insulating layer;a first electrode layer formed on at least a portion of said first semiconductor region; anda second electrode layer formed on a surface of said first semiconductor layer.