Patent ID: 6271097
Filing Date: 2001-08-07
Classification: H01L

Abstract:
A method for fabricating a bipolar transistor, comprising the steps of:providing a semiconductor material structure;forming a base layer on said semiconductor material structure having an exposed surface;forming an emitter contact region on said exposed surface of said base layer;implanting portions of said semiconductor material structure with ions to render said portions of said semiconductor material structure semi-insulating, said base layer being thereby disposed on an implanted and non-implanted portion of said semiconductor material and said emitter contact region being disposed on a non-implanted portion of said semiconductor material;forming a first epitaxial layer of semiconductor material over said exposed surface of said base layer in said implanted portion of said semiconductor material structure;forming a second epitaxial layer of semiconductor material over said first epitaxial layer; andthen forming a base contact on said second epitaxial layer.