InGaAs/InP double-heterostructure bipolar transistors (DHBT\´s) with current gain β ∼ 630 have been realized using gas-source molecular beam epitaxy (GSMBE). These devices exhibit near-ideal β versus I
Ccharacteristic (i.e., β independent of I
C) with a small-signal gain

at

nA. In comparison, we find

for a high-quality AlGaAs/GaAs HBT grown by OMCVD. The higher emitter injection efficiency at low collector current levels found in the InGaAs/InP DHBT is due to at least a factor 100 smaller surface recombination current.