Patent ID: 8829563

Claim:
An insulated gate bipolar device with a gate electrode, the gate electrode being arranged on an emitter side, which device comprises: an active cell with layers of different conductivity types in an order between an emitter electrode on the emitter side and a collector electrode on a collector side opposite to the emitter side as follows: a source region of a first conductivity type; a base layer of a second conductivity type, which contacts the emitter electrode in a contact area; an enhancement layer of the first conductivity type having high doping concentration; a compensation layer of the second conductivity type arranged between the enhancement layer and a drift layer, which has a compensation layer thickness t p , which is a maximum thickness of the compensation layer in a plane perpendicular to the emitter side; the drift layer of the first conductivity type having lower doping concentration than the enhancement layer, wherein the enhancement layer separates the base layer from the drift layer; and a collector layer of the second conductivity type; wherein the compensation layer is arranged in a projection of the contact area between the enhancement layer and the drift layer, such that a channel between the enhancement layer and the drift layer is maintained; wherein the compensation layer floats relative to the base layer such that the compensation layer does not extend into an area outside the projection of the contact area; and wherein the enhancement layer has an enhancement layer thickness t n , which is measured in a same plane as the compensation layer thickness, with: N p t p =kN n t n , wherein N n is a doping concentration of the enhancement layer; wherein N p is the doping concentration of the compensation layer; and wherein k is a factor between 0.67 and 1.5.