Resonant cavity enhanced heterojunction phototransistors based on GaInAsSb-AlGaAsSb grown by molecular beam epitaxy

Conventional and resonant cavity enhanced heterojunction phototransistors (RCE-HPT) based on GaInAsSb-AlGaAsSb grown by molecular beam epitaxy (MBE) have been successfully fabricated and characterized for the first time to operate at near 2.2-μm wavelength range at room temperature (RT). By incorporating a ten-pair lattice matched AlAsSb-GaSb quarter wavelength reflector, a strong cavity enhancement of the photoresponse at the resonant wavelength has been realized. A factor of 3.8 improvement in the absolute responsivity and an optical gain of 2.2 at the resonant wavelength of 2.16 μm at RT have been measured from the RCE-HPT.