A magneto-photoluminescence investigation of the band offset between InAs and arsenic-rich InAs1−<i>x</i>Sb<i>x</i> alloys

Abstract

InAs/InAs0.865Sb0.135 quantum wells are characterized using magneto-photoluminescence. Band- to-band transitions are found at energies lower than the band gaps of either the InAs or the InAs0.865Sb0.135 with photoluminescence emission at wavelengths up to 4.8 μm. By modeling the quantum size shifts of the photoluminescence transitions and their energy shift in a magnetic field, the valence band offset between InAs and In(As,Sb) is deduced to be type II with electron confinement in the In(As,Sb) alloy and hole confinement in InAs.