Patent ID: 8334541

Claim:
A SiC semiconductor device comprising: a reverse type MOSFET, wherein the MOSFET includes: a substrate having a first conductive type or a second conductive type and made of SIC; a drift layer having the first conductive type and made of SiC, wherein the drift layer is disposed on the substrate and has an impurity concentration lower than the substrate; a base region having the second conductive type and made of SiC, wherein the base region is disposed on the drift layer; a base contact layer having the second conductive type and made of SiC, wherein the base contact layer is disposed on the base region and has an impurity concentration higher than the base region; a source region having the first conductive type and made of SiC, wherein the source region is disposed on the base region and has an impurity concentration higher than the drift layer; a plurality of trenches having a stripe pattern in a first direction as a longitudinal direction of the stripe pattern, wherein each trench is disposed on a surface of the source region, penetrates the base region and reaches the drift layer; a gate insulation film disposed on an inner wall of each trench; a gate electrode disposed on the gate insulation film in each trench; an interlayer insulation film covering the gate electrode and having a contact hole, through which the source region and the base contact layer are exposed from the interlayer insulation film; a source electrode electrically coupling with the source region and the base region through the contact hole; and a drain electrode disposed on the substrate and opposite to the drift layer, wherein the MOSFET provides a reverse channel area in a surface portion of the base region, which is disposed on a sidewall of each trench, wherein the MOSFET controls an application voltage to the gate electrode so that the reverse channel area is generated, and the MOSFET flows current between the source electrode and the drain electrode via the source region and the drift layer, wherein the source region and the base contact layer extend along with a second direction, which is perpendicular to the first direction, wherein the source region and the base contact layer are alternately arranged along with the first direction, and wherein the contact hole has a longitudinal direction in the first direction.