Quasi-donor-acceptor pair photoluminescence emission in GaxIn1−xAs/InP

Abstract
The low‐temperature properties of the excitation‐dependent photoluminescence emission, in nominally undoped n‐type GaxIn1−x As (0.44≤x≤0.48) layers grown on InP by molecular‐beam epitaxy, are investigated with changes of temperature and excitation intensity. The excitation‐dependent emission is attributed to the quasi‐donor‐acceptor pair transition in impure compensated crystals. The random impurity potential arising from residual impurities causes a larger energy shift than expected for the usual donor‐acceptor pair transition.