Polysilicon-emitter bipolar transistors with interfacial nitride

Abstract

Polysilicon emitter transistors with interfacial nitride and low emitter resistance have been fabricated reproducibly. The use of a phosphorus emitter has reduced the emitter resistance to a level comparable to that of barrier-free poly emitters. It is shown that the enhanced gain due to the interfacial barrier can be traded off for a reduction in base resistance. The authors have investigated the thermal stability, electrical reliability and noise characteristics of the transistors.<>