Patent ID: 9647099
Date: 2017-05-09
CPC Classifications: H01L

Claim:
1. A method of forming a semiconductor structure comprising: providing an emitter and a collector on a surface of an insulator layer, wherein the emitter and the collector are spaced apart and have a doping of a first conductivity type; forming an intrinsic base between the emitter and the collector and on the insulator layer by epitaxially growing the intrinsic base from at least a vertical surface of the emitter and a vertical surface of the collector, wherein the intrinsic base has a doping of a second conductivity type opposite to the first conductivity type, and wherein a first heterojunction exists between the emitter and the intrinsic base and a second heterojunction exists between the collector and the intrinsic base, and forming an extrinsic base on top of the intrinsic base by epitaxially growing the extrinsic base from a top surface of the intrinsic base such that the extrinsic base overlaps with the emitter, the collector and the intrinsic base, wherein a contact surface of the extrinsic base has an epitaxial relationship with a growth surface of the intrinsic base, and wherein the extrinsic base has a doping of the second conductivity type.