Patent ID: 8653593
Filing Date: 2014-02-18
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor layer provided with a gate trench; a first conductivity type source region formed to be exposed on a surface side of the semiconductor layer for forming part of a side surface of the gate trench; a second conductivity type channel region formed on a side of the source region closer to a back surface of the semiconductor layer to be in contact with the source region for forming part of the side surface of the gate trench; a first conductivity type drain region formed on a side of the channel region closer to the back surface of the semiconductor layer to be in contact with the channel region for forming a bottom surface of the gate trench; a gate insulating film formed on an inner surface of the gate trench; and a gate electrode embedded inside the gate insulating film in the gate trench, wherein the channel region includes a channel portion formed along the side surface of the gate trench so that a channel is formed in operation and a projection projecting from an end portion of the channel portion closer to the back surface of the semiconductor layer toward the back surface.