Patent ID: 8039346

Claim:
A method for manufacturing an insulated gate silicon carbide semiconductor device, the method comprising: forming a first conduction-type low-concentration deposition semiconductor layer deposited on a first conduction-type high-concentration semiconductor substrate; forming a second conduction-type base region in the low concentration layer of the first conduction-type substrate via ion implantation; forming a trench in the substrate that extends from the surface of the substrate to the gate region; performing oblique ion implantation with respect to the substrate surface to form second conduction-type channel regions of low concentration in the sidewalls of the trench; forming first conduction-type first source regions of high concentration at the bottom of the trench, wherein the first source region is formed within the base region; forming a first conduction-type second source region of high concentration in a surface layer of the substrate, wherein the second source region is formed on the channel region; depositing a gate insulating film over the sidewalls of the trench and forming a gate electrode on the gate insulating film; forming an interlayer insulating file over the gate electrodes; and forming a source electrode in the trench and a drain electrode on a bottom surface of the substrate.