Effects of the size and applied electric field on the photoionization cross-section of elliptical cylindrical CdS/ZnS core-shell quantum dots immersed in various dielectric matrices

In this study, the effects of the electric field in different directions on hydrogenic donor impurity (HDI) confined to a CdS/ZnS elliptical core/shell cylindrical quantum dot (ECSCQD) immersed in a dielectric matrix (DM) were investigated. The binding energy (BE) and their corresponding photoionization cross-section (PICS) are computed by solving the Schrodinger equation in cylindrical coordinates in the framework of the effective mass approximation (EMA) using a variational and perturbation approach. The effects of different dielectric matrices, lateral and normal electric field (EF) force, geometric factors such as the size of ECSCQDs and ellipticity constants on BE and PICS were presented. It has been indicated that weak lateral EF strength compared to normal EF strength, dielectric matrix, and geometric factors have a significant effect on the BE and PICS. In addition, it was observed that dielectric matrices and different ellipticity constants were quite effective on the Stark shift (S.S.) in the hydrogenic donor impurity ground state energy due to the electric field. The results obtained from the calculations showed that the structure factors, different impurity positions, the external electric field applied to the structure, the elliptical cylinder shape and the dielectric matrix in which the structure is embedded are quite decisive in the magnitude of the PICS amplitudes and resonant peak values.