Millimetre wave performance of carbon-doped-base AlGaAs/GaAs HBTs

Abstract
AlGaAs/GaAs HBTs with fT of 52 GHz and fmax of 85 GHz have been obtained using a heavily-carbon-doped base layer. The HBT epitaxial layers were prepared by low-pressure MOVPE using carbon tetrachloride as the carbon source. To the authors' knowledge, this work reports the first carbondoped AlGaAs/GaAs HBTs with fT and fmax greater than 50 GHz.

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