Patent ID: 8242537

Claim:
An insulated gate bipolar transistor (IGBT) with a fast reverse recovery time rectifier, comprising: a collector metal layer; a semiconductor substrate having a first conductivity type and being disposed on the collector metal layer, wherein the semiconductor substrate is electrically connected to the collector metal layer; at least a doped cathode region having a second conductivity type and being disposed in the semiconductor substrate, wherein the doped cathode region is electrically connected to the collector metal layer; a drift epitaxial layer having the second conductivity type and being disposed on the semiconductor substrate, wherein the drift epitaxial layer is electrically connected to the semiconductor substrate and the doped cathode region; at least a gate electrode disposed in the drift epitaxial layer; at least a gate insulating layer disposed between the drift epitaxial layer and the gate electrode; at least a doped base region having the first conductivity type and being disposed in the drift epitaxial layer, wherein the doped base region is adjacently connected to the gate insulating layer; at least a doped source region having the second conductivity type and being disposed in the doped base region, wherein the doped source region is adjacently connected to the gate insulating layer; at least a doped contact region having the first conductivity type and being disposed in the doped base region and in the drift epitaxial layer, wherein the doped contact region is adjacently connected to the doped source region; at least a lightly doped region having the first conductivity type and being disposed between the doped contact region and the drift epitaxial layer, the drift epitaxial layer being located on a side of the doped base region opposite to the gate electrode, and the lightly doped region being in contact with the drift epitaxial layer; and an emitter metal layer being disposed on the doped contact region and the doped source region, wherein the emitter metal layer is electrically connected to the doped source region and the doped contact region.