A Theoretical Study of the Electronic Properties of Cd1-xZnxS quantum Dot Superlattices

Abstract

The present work is aimed to investigate theoretically the electronic properties of superlattices based on Cd 1-x Zn x S quantum dots embedded in an insulating material. This system, considered as a series of flattened cylindrical quantum dots with a finite barrier at the boundary, is studied using the tight binding approximation. The ground miniband width and the longitudinal effective mass have been computed, for the electrons, versus the Zn composition and the interquantum dot separation as well. An analysis of the results shows that the Zn compositions x = 0.4 and x = 0.6 are appropriate to give rise a superlattice behavior for conduction electrons in a range of inter-sheet separations studied.

The Energy Levels Splitting Calculated for Electrons in a Double Cd_1-XZn_xs Quantum Dot

“…But, the coupling study within the spherical geometry model is difficult. Consequently, we have proposed, on the other hand, the flattened cylindrical geometry with a finite potential barrier at the boundary to describe the QDs [21][22][23][24][25][26][27][28][29][30][31]. Particularly, we have studied the electronic properties of several structures based on Cd 1-x Zn x S such as the super lattices embedded in an insulating material [23][24][25][26][27][28][29][30].…”

The Energy Levels Splitting Calculated for the Heavy and Light Holes in a Cd<sub>1-x</sub>Zn<sub>x</sub>S Double Quantum Dot

“…Thus, we have suggested, on another hand, the flattened cylindrical geometry with a finite potential barrier at the boundary [35][36][37][38][39][40][41][42][43][44][45]. Using this model, we have investigated, in a first step, the electronic properties of a single Cd 1-x Zn x S quantum dot [35].…”

“…We have studied, in a second step, the electronic properties of the super lattices based on Cd 1-x Zn x S embedded in an insulating material with use of several potential models and different methods (Kronig -Penney method, sinusoidal and triangular potentials, Tight Binding approximation…) [36][37][38][39][40][41][42][43]. Thus, our interest has especially been focused on the computation of the ground miniband width and the longitudinal effective mass for the carriers.…”

A Theoretical Study of the Heavy and Light Hole Properties of Cd1-xZnxS Quantum Dot Superlattices

“…We have suggested, in a second time, the flattened cylindrical geometry with a finite potential barrier at the boundary [23][24][25][26][27][28][29]. Using this model, we have investigated, in a first step, the electronic properties of Cd 1-x Zn x S quantum dots [23].…”

“…More precisely, we have calculated the shape of the confining potential, the subband energies and their eigen envelope wave functions. We have studied, in a second step, the coupling in the case of superlattices based on Cd 1-x Zn x S quantum dots embedded in an insulating material with use of several potential models and different methods (Kronig -Penney method, sinusoidal and triangular potentials, Tight Binding approximation…) [24][25][26][27][28][29]. In this context, our interest has been focused, in a recent study, on the computation of the ground miniband width and the longitudinal effective mass for the electrons.…”