Patent ID: 7109551

Claim:
A semiconductor structure, comprising a semiconductor layer having a device trench formed therein and a surface; a semiconductor device formed in the semiconductor layer, including a collector region of a first conductivity type on an underside of a bottom of the device trench, an emitter region of a second conductivity type, outside the trench in the surface layer of the semiconductor layer, the second conductivity type being different than the first conductivity type; a base region of the first conductivity type between the emitter region and the collector region; a drift region of the second conductivity type between the base region and the collector region; a gate insulator film inside the device trench; a gate electrode inside the gate insulator film; an interlayer insulator film inside the gate electrode; a buried electrode inside the interlayer insulator film and electrically connected to the collector region at the bottom of the device trench; a collector electrode electrically connected to the buried electrode; and an emitter electrode electrically connected to both the emitter region and the base region.