Patent ID: 8604544

Claim:
A semiconductor device, comprising: a first main electrode; a base layer of a first conductivity type provided on the first main electrode; a barrier layer of the first conductivity type and a diffusion layer of a second conductivity type provided on the base layer of the first conductivity type, the barrier layer of the first conductivity type and the diffusion layer of the second conductivity type being arranged alternately; a base layer of the second conductivity type provided on the barrier layer of the first conductivity type; a first conductor layer and a second conductor layer, each of the first conductor layer and the second conductor layer being provided between the base layer of the second conductivity type and the diffusion layer of the second conductivity type and being provided between the barrier layer of the first conductivity type and the diffusion layer of the second conductivity type, each of the first conductor layer and the second conductor layer being provided in a trench region with an insulating film interposed between the first and second conductor layers and a periphery of the trench region; and a second main electrode being connected to the base layer of the second conductivity type and not connected to the diffusion layer of the second conductivity type, an impurity concentration of the barrier layer of the first conductivity type being higher than an impurity concentration of the base layer of the first conductivity type, bottom face of the barrier layer of the first conductivity type and the diffusion layer of the second conductivity type being positioned between the first main electrode and lower ends of the first conductor layer and the second conductor layer, and the barrier layer of the first conductivity type and the diffusion layer of the second conductivity type forming a super junction proximally to tips of the first conductor layer and the second conductor layer.