Electronic and optical properties of an off-centre donor impurity in a WZ ZnS/ZnO/ZnS multishell spherical quantum dot

In this study, a detailed investigation was done on the effects of changing the position of a donor impurity on the electronic and optical properties of an electron confined within a fixed size wurtzite (WZ) ZnS/ZnO/ZnS multishell quantum dot. We carried out the calculation using the framework of the effective mass approximation (EMA), relying entirely upon the non-degenerate quantum perturbation theory, using the unperturbed impurity-less eigenstates as expansion states. We computed the binding energy for the ground state and several other excited states as well as the transition dipole moment (TDM) along the z-direction for multiple electron state transitions. Finally, we concluded by computing the absorption coefficient for multiple transitions using perturbed electron states energy and transition dipole moments. The results show that the position of the donor impurity does have an impact on the electronic and optical properties of the confined electron.