Patent ID: 7791135

Claim:
An insulated gate silicon carbide semiconductor device primarily made of silicon carbide semiconductor material, the semiconductor device comprising: a first conduction-type low-concentration deposition semiconductor layer deposited on a first conduction-type high-concentration semiconductor substrate; a second conduction-type base region buried in the first conduction-type low-concentration deposition semiconductor layer; a trench extending from the surface of the first conduction-type low-concentration deposition semiconductor layer to the second conduction-type base region; a first conduction-type first source region selectively formed in the surface layer of the second conduction-type base region at the bottom of the trench; a second conduction-type channel region formed in a surface layer of the first conduction-type low-concentration deposition semiconductor layer along a sidewall of the trench, wherein one end of the second conduction-type channel region is in contact with the first conduction-type first source region; a gate electrode located adjacent to the second conduction-type channel region formed along the sidewall of the trench, wherein a gate insulating film is provided between the gate electrode and the second conduction-type channel region; a source electrode located adjacent to the gate electrode on the trench sidewall, wherein an interlayer insulating film is provided between the source electrode and the gate electrode, and wherein the source electrode is in direct contact with a surface of the first conduction-type first source region and a surface of the second conduction-type base region that are exposed at the bottom of the trench; and a drain electrode on the opposite side of the semiconductor substrate from the source electrode.