Comparison of Razavy and Pöschl -Teller confined potentials on the opto-electronic properties in a ZnSe/CdSe/ZnSe quantum well

Abstract

Electronic and optical properties of an exciton in the ZnSe/CdSe/ZnSe quantum well are investigated using the Razavy and Pöschl -Teller confined potentials. The theoretical investigations on exciton binding energy, oscillator strength, radiative lifetime, absorption coefficient and changes of refractive index are focused on the structural parameters of these two potentials. They are carried out using variational method and the matrix density approach. Out of two structural parameters (A and M) in the Razavy potential, M is found to be much more effective than A, similarly, λ parameter is more effective than the other parameter χ in Pöschl-Teller potential. The single quantum well becomes double quantum well when the value of A is less than the value of M. The potential asymmetry is developed if the structural parameters are altered. Further, the optical properties are strongly affected by the geometrical size, changes in the structure and the associated structural parameters. It leads to alter the optical properties drastically in the quantum well. The results are compared with the available literature and we hope that they can be used for the design of potentials for the future opto-electronic devices.