Patent ID: 6869852

Claim:
A method for fabricating a bipolar transistor with a raised extrinsic base, an emitter and a collector, the method comprising the steps of: a) providing an intrinsic base layer; b) forming a first insulator layer on a portion of the intrinsic base layer; c) forming a raised extrinsic base layer on the first insulator layer and the intrinsic base layer; d) forming a second insulator layer on the raised extrinsic base layer; e) providing an emitter opening by selectively removing portions of the raised extrinsic base layer and the second insulator layer to expose a portion of the first insulator layer; f) forming a spacer along a sidewall of the emitter opening; g) selectively removing the first insulator layer; h) forming a conductor in a space vacated by the first insulator layer; i) converting the conductor within the emitter opening to a third insulator such that the third insulator extends under at least a portion of the spacer; and j) forming the emitter.