Physical meaning of electron capture kinetics on <i>D</i> <i>X</i> centers

Abstract

The capture kinetics of electrons on DX centers are interpreted in terms of a simple model taking only into account the fact that the concentrations of the DX centers and of the doping impurities are equal. It is shown that there is no need to introduce an alloying effect in order to explain the capture as well as the emission kinetics, in agreement with the nonobservation of this effect in optical transitions. This is understood if the DX center is itself the donor impurity.