Numerical modelling of electronic and optical properties for different sizes of CdSe/ZnS quantum dots under temperature and hydrostatic pressure effects
Résumé
Abstract In his paper, the electronic and optical properties of different sizes of CdSe/ZnS quantum dots (QDs) are theoretically investigated. The energy eigenvalues and wave functions dependence on QD dimension, temperature and pressure are calculated by using the combination of coordinate transformation and the finite difference method (FDM). The oscillator strength, transition lifetime, absorption coefficients (AC) and refractive index changes (RIC) are brought out for various values of dots sizes, temperature, hydrostatic pressure, and incident photon intensity. The obtained results indicated that the electronic and optical properties are strongly dependent on the temperature, hydrostatic pressure and on the size of the nanostructure. The oscillator strength decreased as the hydrostatic pressure increased, but increased as the temperature increased, the opposite behavior has observed for the transition lifetime. Moreover, the total of AC and RIC increase by decreasing the incident optical intensity. Linear, nonlinear, and total AC and RIC displays a red shift (blue shift) with increasing the hydrostatic pressure (temperature).
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