Patent ID: 6756278
Filing Date: 2004-06-29
Classification: H01L

Abstract:
A method of fabricating a lateral heterojunction bipolar transistor, the method comprising the steps of:(a) forming an etching mask on a semiconductor layer disposed on an insulating layer to compose a substrate; (b) patterning the semiconductor layer by etching including dry etching and using the etching mask to form a first semiconductor layer in a mesa configuration; (c) epitaxially growing, on at least one side surface of the first semiconductor layer, a second semiconductor layer having a band gap different from a band gap of the first semiconductor layer; and (d) epitaxially growing, on a side surface of the second semiconductor layer, a third semiconductor layer having a band gap different from the band gap of the second semiconductor layer, at least the first semiconductor layer functioning as a 5 collector of a first conductivity type, at least a part of the second semiconductor layer functioning as an internal base layer of a second conductivity type, at least a part of the third semiconductor layer functioning as an emitter operating region of the first conductivity type.