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Binding energy and spatial extension of an off-centre donor impurity in ZnS/CdSe spherical core/shell nanostructures

A. IBRAL1,2, A. ZOUITINE3, EL MAHDI ASSAID4,2, EL MUSTAPHA FEDDIc3, F. DUJARDIN5

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. 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.
  5. LCPMC, Institut de Chimie, Physique et Matériaux, Université de Lorraine, 1 Bd Arago, 57070 Metz, France

Abstract

Coulomb correlation, binding energy and inter-particle distance of a donor impurity placed anywhere in the well region of a spherical core/shell nanostructure are studied in the framework of the effective mass approximation. Finite height barrier is used to describe conduction band offset between core and shell of the structure. Electron effective mass mismatch between core and shell and dielectric mismatch at the surface where core and shell materials meet are taken into account. Off-centre donor ground state energy is determined via Ritz variational principle using a trial wave function where Coulomb attraction between electron and ionized donor is considered. The theoretical approach developed is used to determine Coulomb correlation parameter, binding energy and spatial extension of the off-centre donor as functions of core to shell radii ratio for ZnS/CdSe core/shell nanostructures immersed in aqueous or organic solution..

Keywords

Off-centre donor, Exciton, Core/Shell nanostructure, Quantum dot, Dielectric mismatch.

Submitted at: Nov. 11, 2014
Accepted at: Jan. 21, 2015

Citation

A. IBRAL, A. ZOUITINE, EL MAHDI ASSAID, EL MUSTAPHA FEDDIc, F. DUJARDIN, Binding energy and spatial extension of an off-centre donor impurity in ZnS/CdSe spherical core/shell nanostructures, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 1-2, pp. 151-159 (2015)