Patent ID: 7696034
Filing Date: 2010-04-13
Classification: H01L

Abstract:
1. A method of forming a high-performance heterojunction bipolar transistor comprising the steps of: providing a structure comprising at least a raised extrinsic base region and an emitter pedestal region, said emitter pedestal region located on a portion of a base region that is monocrystalline; forming a stack comprising a sacrificial oxide layer and a top nitride layer on said raised extrinsic base region; removing layers of at least the emitter pedestal region to provide an opening that exposes the monocrystalline base region; forming an emitter in said opening; forming an isolation nitride spacer on sidewalls of at least said emitter; forming an undercut in an area beneath the emitter; depositing a conformal refractory metal; and annealing said conformal refractory metal whereby said annealing causes reaction between the conformal refractory metal and underlying Si so as to form a metal silicide region atop the raised extrinsic base that extends to said emitter in a self-aligned manner.