Abstract
The present work is aimed to investigate theoretically the electronic properties of superlattices based on Cd1-xZnxS 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 inter-quantum 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.
Highlights
The high potentialities of quantum dots (QDs) based on the Cd1-xZnxS ternary alloy, have been demonstrated in many device applications [1,2,3]
We have studied superlattices based on Cd1-xZnxS quantum dots embedded in an insulating material using several models
We investigated the coupling in superlattices made by Cd1-xZnxS QDs for compositions ranging from CdS to ZnS
Summary
The high potentialities of quantum dots (QDs) based on the Cd1-xZnxS ternary alloy, have been demonstrated in many device applications [1,2,3]. To study the Cd1-xZnxS QDs, most approaches have considered that electrons and holes are confined in a spherical QD of radius R and used an infinite potential barrier model [4, 11,12,13,14]. We have studied superlattices based on Cd1-xZnxS quantum dots embedded in an insulating material using several models. All these studies have been carried out as a function of inter-quantum dot separation for different zinc compositions. We have used, in a first work, the Kronig-Penney method to illustrate the confinement potential Within this model, we have calculated the ground and the first excited minibands as well as the longitudinal effective mass for both electrons and holes [18]. In a third work, using the triangular potential model, we have calculated, for electrons, heavy holes and light holes, the Γ1 − miniband and the longitudinal effective mass as well [20]
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