Patent ID: 6977398

Claim:
A SiGe heterojunction bipolar transistor having improved SiGe bipolar yield comprising: a semiconductor substrate of a first conductivity type including at least a sub-collector region and a collector region; a SiGe base layer located on said substrate, said SiGe base layer comprising at least a collector-base junction region located over the collector region and an intrinsic base region, wherein said intrinsic base region is abutted by germanium-containing extrinsic base regions that are located in upper surface regions of said SiGe base layer, yet not in direct contact with said intrinsic base region; and an emitter region located on a portion of said intrinsic base region, said emitter region comprising at least an emitter polysilicon region, wherein at least one region of said structure selected from said collector, said sub-collector, said extrinsic base regions and said collector-base junction region includes a C implant.