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Published online by Cambridge University Press: 25 February 2011
This paper reviews the present status of heterojunction bipolar transistor (HBT) technology based on GaAlAs/GaAs and InP/InGaAs materials, and discusses a variety of approaches for device improvement. Among the possibilities presented are novel structures to reduce base-collector capacitance, and novel materials to increase breakdown voltage and reduce base-emitter turn-on voltage.