Patent ID: 6271577
Filing Date: 2001-08-07
Classification: H01L

Abstract:
An improved bipolar transistor which comprises:a collector of a first conductivity type upon a substrate;a base of a second conductivity type adjoining the collectoran emitter of the first conductivity type embedded in the base along a side opposed to the collector;an upper emitter region adjoining the emitter and electrically connected to the emitter;a first dielectric sidewall spacer on the upper emitter region;a first electrically conductive material extending along the sidewall spacer to the base, thereby spacing the first electrically conductive material from the upper emitter region by only the thickness of the first sidewall spacer; anda first electrically conductive region contacting the first electrically conductive material and spaced from the substrate,wherein the first electrically conductive region has a width approximately equal to the first sidewall spacer width.