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InP-In0.53Ga0.47As-InP double heterojunction bipolar transistors (DHBTs) were grown on GaAs substrates. A 284-GHz power-gain cutoff frequency fmax and a 216-GHz current-gain cutoff frequency fτ were obtained, presently the highest reported values for metamorphic HBTs. The breakdown voltage BVCEO was >5 V while the dc current gain β was 21. High thermal conductivity InP metamorphic buffer layers were employed in order to minimize the device thermal resistance.