Patent ID: 7253070

Claim:
A method of forming a bipolar transistor comprising the steps of: forming a collector; forming an intrinsic base above said collector; forming extrinsic base regions separated by an emitter channel, said emitter channel exposing an upper surface of said intrinsic base; forming emitter/base spacers on vertical surfaces of each of said extrinsic base regions; forming an emitter within said emitter channel, wherein said emitter is recessed below an upper surface of said extrinsic base regions; forming an isolation stack atop at least said extrinsic base regions and said emitter; forming a dielectric layer atop said isolation stack; providing an emitter via through said dielectric layer and said isolation stack to expose said emitter and a portion of said extrinsic base regions; and forming contact isolation spacers within said emitter via to provide electrical isolation between said recessed emitter and said extrinsic base regions, wherein a portion of said recessed emitter remains exposed.