Patent ID: 9029979
Filing Date: 2015-05-12
Classification: H01L

Abstract:
1. A 4h-SiC semiconductor element comprising: a 4h-SiC substrate; a drift region having a c-axis in a direction perpendicular to the surface of the substrate and formed on the side of the surface of the substrate by using 4h-S C; a base region formed on the side of the surface of the drift region using 4h-SiC; a source region formed on the side of the surface of the base region by using 4h-SiC; a source electrode formed on the side of a surface of the source region by using 4h-SiC; a trench-shaped gate electrode covering the channel region of the base region; a gate insulating film formed at the boundary between the gate electrode and the channel region; a drain region formed on the side of a back of the 4h-SiC substrate by using 4h-SiC; a drain electrode formed on the side of the back of the drain region; and a trench-shaped buried oxide film layer of applying a compressive strain in a direction of two axes or more on a plane perpendicular to the c-axis of the channel region and applying a tensile strain along the direction of the c-axis.