Patent ID: 8097901

Claim:
A trench gate type insulated gate bipolar transistor comprising: a semiconductor substrate having a first conductive type; a channel region having a second conductive type and disposed on a first side of the substrate, wherein the channel region includes a first channel region and a second channel region; an emitter region having the first conductive type and disposed in a surface portion of the first channel region; a plurality of trenches penetrating the channel region and reaching the substrate, wherein the plurality of trenches includes a first trench and a second trench, wherein the first channel region only contacts the first trench, and the second channel region contacts the second trench; a gate electrode disposed in the first trench via an insulation film; an embedded electrode disposed in the second trench via the insulation film, wherein the embedded electrode is electrically separated from the gate electrode; and an emitter electrode electrically coupling both the emitter region and the first channel region, wherein the emitter electrode covers the gate electrode, the embedded electrode and the second channel region via the insulation film so that the emitter electrode is electrically separated from the gate electrode, the embedded electrode and the second channel region, wherein the embedded electrode electrically couples at least the second channel region, which is sandwiched between the first trench and the second trench.