Effect of interdiffusion on electronic states and absorption coefficient of semiconductor superlattice of cubic symmetry

The effect of interdiffusion of Al and Ga atoms on confining potential, band structure and electromagnetic radiationʹs absorption coefficient of three dimensional superlattice, composed of initially spherical GaAs/Ga1−xAlxAs quantum dots is investigated in the framework of the modified Wood–Saxson potential model. It is shown that the interdiffusion leads to the disappearance of quantum dots’ spherical symmetry, to the widening of the energy minibands and to the significant decrease in the interband absorption coefficient. The obtained results indicate the opportunity to take into account the interdiffusion in the calculations of different characteristics of superlattices.