Patent ID: 6020600
Filing Date: 2000-02-01
Classification: H01L,Y10S

Abstract:
A silicon carbide semiconductor device comprising:a semiconductor substrate comprising a first conductive type base semiconductor layer, a first conductive type high-resistance semiconductor layer having a resistance higher than that of said base semiconductor layer and laminated on the first conductive type base semiconductor layer, and a second conductive type first semiconductor layer laminated on top of the first conductive type high-resistance semiconductor layer, the semiconductor substrate being formed of a single crystal of silicon carbide;a first conductive type semiconductor region provided in a predetermined region in the first semiconductor layer;a trench extending through the semiconductor region and the first semiconductor layer into the high resistance semiconductor layer, the trench having a side surface and a bottom surface;a second semiconductor layer extendedly provided on and in contact with the surface of the semiconductor region, the first semiconductor layer, and the high-resistance semiconductor layer, the second semiconductor layer being formed along said side surface of said trench and comprising a layer of silicon carbide;a gate insulating layer formed at least on the surface of the second semiconductor layer in the trench;a gate electrode layer provided on the surface of the gate insulating layer within the trench;a first electrode layer electrically connected to the semiconductor region and to the first semiconductor layer; anda second electrode electrically connected to the base semiconductor layer; whereinthe second semiconductor layer extends along the side surface of the trench from a bottom of the trench to an opening of the trench and the semiconductor region is electrically coupled with said gate insulating layer via said second semiconductor layer.