Patent ID: 8216910
Filing Date: 2012-07-10
Classification: H01L

Abstract:
1. A method of forming Heterojunction Bipolar Transistors (HBTs) on a wafer, said method comprising: providing a group III-V compound semiconductor based substrate; forming of HBT layers up to and including a collector layer on said substrate; forming at least a first lightly doped collector region in said collector layer for a least one high F forming at least a second lightly doped collector region in said collector layer for a least one high breakdown voltage (BVceo) HBT, wherein a thickness of the first lightly doped collector region for the high F implanting first ions through said first lightly doped collector region to form a first implant region in said collector layer; implanting second ions through said second lightly doped collector region to form a second implant region in said collector layer; and annealing said wafer.