Patent ID: 7064417

Claim:
A semiconductor device including a bipolar transistor formed on a semiconductor substrate, wherein a collector region is formed on said semiconductor substrate; on the surface of said semiconductor substrate a first insulating layer which has a first opening in said collector region is formed; a base semiconductor layer is formed in contact with said collector region through said first opening; said base semiconductor layer is formed over said first insulating layer with the edge thereof extending onto said first insulating layer; an emitter semiconductor layer is formed in a predetermined region on said base semiconductor layer; on said first insulating layer, a second insulating layer is formed covering the edge of said base semiconductor layer, and a second opening which opens a contact portion of said emitter semiconductor layer to said base semiconductor layer and a third opening which opens a base electrode take-out portion of said base semiconductor layer are formed; and a metal silicide layer is formed on the surface of said base semiconductor layer inside said third opening.