InAs0.85Sb0.15 infrared photodiodes grown on GaAs and GaAs-coated Si by molecular beam epitaxy

Abstract
We report on the first InAs0.85Sb0.15 infrared photodiodes, grown on GaAs and GaAs‐coated Si substrates by molecular beam epitaxy. Transmission electron microscopy images reveal a good structural quality. The electrical characteristics of the photodiodes were analyzed using current‐voltage, current‐temperature, and capacitance‐voltage measurements. The spectral response and detector noise were measured at 77 K, resulting in a peak detectivity at 3.8 μm of 1.5×1011 cm Hz1/2/W for InAs0.85Sb0.15/GaAs and 5.0×1010 cm Hz1/2/W for InAs0.85Sb0.15/GaAs/Si.