Patent ID: 8198675
Filing Date: 2012-06-12
Classification: H01L

Abstract:
1. A method of manufacturing a silicon carbide semiconductor device, comprising the steps of: (a) forming an extended terrace surface at a first part of a surface of a base semiconductor layer made of hexagonal silicon carbide, by heat-treating said base semiconductor layer while providing silicon to the first part of said base semiconductor layer, and forming an unextended terrace surface at a second part the surface of said base semiconductor layer by heat-treating said base semiconductor layer without providing silicon to the second part of the surface of said base semiconductor layer; (b) epitaxially growing a new growth layer made of silicon carbide on said base semiconductor layer, the new growth layer made of silicon carbide portion of a first type grown on the extended terrace surface and a silicon carbide portion of a second type grown on the unextended terrace surface; (c) forming a trench having a wall portion formed of the silicon portion of the second type by removing at least a portion of silicon carbide portion of the first type grown on said extended terrace surface in said new growth layer; and (d) forming a gate electrode in said trench after said step (c).