Role of various dielectric environment matrices of InP/ZnS core/shell quantum dot on optical gain coefficient

Abstract

Theoretical studies on excitonic and optical properties of a single exciton confined in an InP/ZnS heterostructure core/shell quantum dot embedded in various dielectric environments are investigated. The energies are found with and without the inclusion of dielectric mismatch employing single band effective mass approximation using variational formulism. The solution of Poisson-Schrodinger wave equations for the attractive term between the electron and hole is carried out using a self consistent approach in the Hartree approximation. The binding energy due to an exciton and oscillator strength is found with the effect of geometrical confinement. The total absorption coefficients, the injection current density for the optical output and the corresponding threshold optical pump intensity studied in the presence of various dielectric environments are investigated in the InP/ZnS heterostructure core/shell quantum dot. The ratio of core/shell hetero-structured quantum dot radius for various values of dielectric matrices immersed is found. The results show that the obtained properties are considerably enhanced with the incorporation of dielectric environment matrices immersed in the core/shell quantum dot particularly the highest dielectric constant will bring out the better results. It is hoped that to the present study will contribute the understanding of excitonic and optical properties in the group II–VI core/shell heterostructure quantum dots for the potential applications in photovoltaic and light emitting diodes.