Patent ID: 6867456

Claim:
A semiconductor device comprising: a semiconductor substrate, which forms a source region of a first conduction type, wherein the semiconductor substrate has a top surface and a back surface, wherein the back surface is opposite to the top surface; a base region of a second conduction type, wherein the base region extends perpendicularly from the top surface in the substrate; a drift region of the first conduction type, wherein the drift region has an impurity concentration lower than that of the source region and extends perpendicularly from the top surface within the base region; a drain region extending perpendicularly from the top surface within the drift region; a gate insulating film formed on a surface that defines a trench, wherein the gate insulating film extends perpendicularly from the top surface and extends in a lateral direction from the source region to the drift region through the base region; and a gate electrode formed on a surface of the gate insulating film such that, when a voltage is applied to the gate electrode, a channel region is generated in the vicinity of a surface of the base region adjacent to the trench, wherein the flow of the channel occurs in the lateral direction.