Patent ID: 6465870
Filing Date: 2002-10-15
Classification: H01L

Abstract:
A SiGe bipolar transistor comprising:a substrate of a first conductivity type; a doped subcollector region of a second conductivity type atop said substrate, said doped subcollector region including an epitaxial collector region which is defined between isolation regions; a first film comprising silicon and germanium located above said doped subcollector region, said first film including a single crystal SiGe intrinsic base region and extrinsic SiGe polysilicon base regions of said first conductivity type abutting said intrinsic base region; a second film comprising an emitter of the second conductivity type contained over said intrinsic base region formed by an emitter window mask and a second region formed outside of the emitter; a first doped region of the first conductivity type located at a facet point between said intrinsic base region and one of said extrinsic base regions; a second doped region of said first conductivity type contained at the outermost extrinsic base regions; said second doped region forming a base input; and a resistor located in the extrinsic SiGe polysilicon base regions between said first and second doped regions, said resistor including SiGe film.