Patent ID: 8410548
Filing Date: 2013-04-02
Classification: H01L

Abstract:
1. 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: 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.