Patent ID: 8853775

Claim:
A semiconductor device comprising: a semiconductor substrate having first and second main surfaces; control electrodes disposed in trenches on the first main surface of the semiconductor substrate via insulators, and extending in a first direction parallel to the first main surface; and control interconnects disposed on the first main surface of the semiconductor substrate so as to be electrically connected to the control electrodes, and extending in a second direction perpendicular to the first direction, the semiconductor substrate comprising: a first semiconductor layer of a first conductivity type disposed in the semiconductor substrate; one or more second semiconductor layers of a second conductivity type disposed on a surface of the first semiconductor layer on a first main surface side so as to be sandwiched between the control electrodes; one or more third semiconductor layers of the first conductivity type disposed on surfaces of the second semiconductor layers on the first main surface side so as to be sandwiched between the control electrodes, and extending in the second direction; and a fourth semiconductor layer of the second conductivity type disposed on the second main surface of the semiconductor substrate.