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Effects of dielectric mismatch and effective mass mismatch on exciton ground state energy in spherical Core/Shell nanostructures

A. IBRAL1,2, A. ZOUITINE3, S. AAZOU1,2, EL MAHDI ASSAID1,2,* , EL MUSTAPHA FEDDI3, F. DUJARDIN4

Affiliation

  1. Equipe d’Optique et Electronique du Solide, Département de Physique, Faculté des Sciences, Université Chouaïb Doukkali, B. P. 20 El Jadida principale, El Jadida, Royaume du Maroc
  2. Laboratoire d’Instrumentation, Mesure et Contrôle, Département de Physique, Université Chouaïb Doukkali, B. P. 20 El Jadida principale, El Jadida, Royaume du Maroc
  3. Département de Physique, Ecole Nationale Supérieure d’Enseignement Technique, Université Mohammed V Souissi, B. P. 6207 Rabat-Instituts, Rabat, Royaume du Maroc
  4. LCPMC, Institut de Chimie, Physique et Matériaux, Université de Lorraine, 1 Bd Arago, 57070 Metz, France

Abstract

Exciton confined in a spherical core/shell nanostructure is studied in the framework of the envelope function approximation. Finite height barriers are used to describe conduction and valence band offsets between core and shell of the structure. Electron and hole effective masses mismatch between core and shell and dielectric mismatch at the surface where core and shell materials meet are taken into account. Exciton ground state energy is determined via the Ritz variational principle using a trial wave function where the coulomb attraction between electron and hole is considered. The theoretical approach developed is applied to determine the coulomb correlation parameter, the binding energy and the spatial extension of a bound electron-hole pair as functions of the core to shell radii ratio for CdS/HgS core/shell nanostructures immersed in aqueous or organic solution..

Keywords

Exciton, Core/Shell nanostructure, Quantum dot, Dielectric mismatch.

Submitted at: Sept. 2, 2013
Accepted at: Nov. 7, 2013

Citation

A. IBRAL, A. ZOUITINE, S. AAZOU, EL MAHDI ASSAID, EL MUSTAPHA FEDDI, F. DUJARDIN, Effects of dielectric mismatch and effective mass mismatch on exciton ground state energy in spherical Core/Shell nanostructures, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 11-12, pp. 1268-1274 (2013)