Patent ID: 11967616
Assignee: HITACHI ENERGY LTD
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A vertical silicon carbide power Insulated Gate Bipolar Transistor (IGBT), comprising:
a field stop layer formed by a 4H-SiC substrate with n type doping;
a drift region comprising a 4H-SiC epilayer of n-type, 4H-SiC epilayer having been epitaxially grown the 4H-SiC substrate;
an emitter region of p++ type doping disposed in the drift region;
a well region of p-type doping disposed in the drift region;
a channel region of p-type doping disposed in the drift region;
a contact region with n++ type doping disposed in the drift region;
a metal gate insulated from the emitter region and the drift region by a gate-oxide;
a collector layer of p+ type doping disposed on a surface of the field stop layer, the field stop layer disposed between the drift region and the collector layer; and
a high mobility layer comprising a 3C-Si epilayer located at an interface between the 4H-SiC epilayer and the gate-oxide, wherein the high mobility layer having a vertical thickness between 0.1 nm to 50 nm.