Patent ID: 7824995
Filing Date: 2010-11-02
Classification: H01L

Abstract:
1. A method for manufacturing a silicon carbide semiconductor device having an MOS structure, the method comprising: preparing a substrate made of silicon carbide and having a main surface; forming a channel region made of silicon carbide on the substrate, wherein the channel region provides a current path as a channel and has an impurity concentration lower than an impurity concentration of the substrate; forming a first impurity region on an upstream side of the current path and a second impurity region on a downstream side of the current path; forming a gate insulating film on a surface of the channel region; forming a gate on the gate insulating film; and performing a heat treatment either during or after the forming of the gate insulating film, wherein the channel of the channel region for flowing current between the first impurity region and the second impurity region is controlled by a voltage applied to the gate, the performing the heat treatment includes: an interface between the channel region and the gate insulating film provides a channel surface perpendicular to a (0001)-orientation plane, and the channel surface is oriented so that current flows along the channel surface.