Abstract
In this work, we have modelling a ZnSe/ZnSxSe1-x and ZnSe/ZnSxSe1-x/ZnS core/shell and core/shell /shell quantum dot (QDs) respectively in the intent to study the effect of the second shell ZnS on the electronic and optical properties. To solve the three dimensional Schrödinger equation, we have used a theoretical method which is combined the coordinate transformation and the finite difference method (FDM). We have evaluated the influence of ZnS shell material, first on the energy eigenvalues and on the transition lifetime, then on the linear, non-linear and total absorption coefficient and refractive index changes. The first linear and third order nonlinear susceptibilities are also investigated.
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