Patent ID: 6852580

Claim:
A method of fabricating a semiconductor device including a bipolar transistor having an emitter, a base and a collector, a semiconductor region and a Schottky diode having a Schottky electrode in Schottky contact with said semiconductor region, comprising the steps of: (a) forming an emitter electrode on a semiconductor substrate including a first semiconductor layer of a first conductivity type, a second semiconductor layer of a second conductivity type deposited on said first semiconductor layer and a third semiconductor layer of the first conductivity type deposited on said second semiconductor layer; (b) forming an emitter layer and a base layer by patterning said third semiconductor layer and said second semiconductor layer by using an etching mask masking said emitter electrode and an area around said emitter electrode, and exposing a surface of said first semiconductor layer after forming said emitter layer and said base layer; (c) forming an isolation region for dividing said first semiconductor layer between a collector region and a Schottky diode region after the step (b); (d) exposing part of a surface of said base layer by patterning said emitter layer; and (e) forming a base electrode on the exposed surface of said base layer, and forming said Schottky electrode on said first semiconductor layer in said Schottky diode region.