Progress On InP/InGaAs(P) Heterojunction Bipolar Transistors

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Abstract
Preparation of lattice matched InP/InGaAs(P) heterojunctions was first reported by Antypas et all in 1972. Initially research efforts were mainly concentrated on optical devices. In recent years three-terminal InP/InGaAs(P) heterojunction bipolar transistors (HBT's), for microwave and digital applications, have gained more interest. Several laboratories have reported HBT's fabricated by LPE techniques but these were not optimised. More recently devices grown by MBE and CBE have been demonstrated in the InP/ InGaAs system. This paper is concerned with discussing the intrinsic advantages to be gained by fabricating HBT's in this material system and progress attained to date is reviewed.

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