Patent ID: 8435852
Filing Date: 2013-05-07
Classification: H01L

Abstract:
1. A method for fabricating a heterojunction bipolar transistor (HBT), comprising: providing a structure comprising sequentially a substrate, a collector layer for the HBT, a base layer for the HBT, an epitaxial layer, and an emitter metal layer for the HBT; etching the emitter metal layer and the epitaxial layer to form an emitter electrode comprised of an epitaxy pedestal underlying an emitter metal cap; depositing a base metal layer over the structure to a height above the top of the emitter epitaxy pedestal; depositing a photoresist layer over the base metal layer; irradiating the photoresist layer through a mask; removing a portion of the photoresist layer so that only a portion of the base metal layer that is spaced a predetermined distance away from the emitter electrode remains covered by photoresist; removing the portion of the base metal layer that is not covered by photoresist; and removing the remainder of the photoresist.