Theoretical studies of energy states of CdSe/ZnS/CdSe and ZnS/CdSe/ZnS quantum dots with an impurity

The energy states of an electron in the presence of impurity ion in center of A: CdSe/ZnS/CdSe and B: ZnS/CdSe/ ZnS quantum dots were investigated by the numerical method in the framework of the effective mass approximation. The electronic properties of A and B quantum dots including the binding energy and the radial probability distribution have been calculated as a function of core radius while the outer radius of quantum dots was fixed. It was expected that the arrangement of materials with different energy gaps in the two structures would affect the electronic properties. The numerical results have presented that the geometry of these two quantum dots as well as the effect of the quantum confinement which occurs mainly in the core of structure A and in the shell of structure B, has a significant effect on the electronic properties of quantum dots.