Patent ID: 8410548

Claim:
An insulated gate bipolar transistor (IGBT) device comprising: a substrate of a first conductivity type, the substrate comprising an emitter of the IGBT device; a buffer layer disposed on the substrate, the buffer layer being of a second conductivity type opposite to the first conductivity type; a pillar of semiconductor material disposed on the buffer layer, the pillar having a top surface, first and second sidewall portions, a first lateral width, and a first thickness that extends from the top surface down to the buffer layer, the pillar including: a body region of the first conductivity type, the body region extending across the first lateral width; a drift region that extends vertically from the body region to the buffer layer, the drift region being of the second conductivity type and comprising an extended drain of a field-effect transistor (FET); a first region disposed at the top surface, the first region being of the second conductivity type, the first region comprising a source of the FET; a second region disposed at the top surface laterally adjacent the first region, the second region being of the first conductivity type and comprising a collector of the IGBT device, the body region vertically separating the first and second regions from the drift region, first and second dielectric layers that respectively cover the first and second sidewall portions of the pillar from at least just beneath the body region down to the buffer layer; and a trench gate of the FET disposed laterally adjacent to, and insulated from, the body region, application of a voltage potential to the trench gate controlling input forward conduction between the emitter and the collector when the IGBT device is in an on-state.