Energy spectrum of an exciton in a CdSe/ZnTe type-II core/shell spherical 
quantum dot

Chafai, A.; Dujardin, F.; Essaoudi, I.; Ainane, Abdelmajid

doi:10.1016/j.spmi.2016.11.017

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Energy spectrum of an exciton in a CdSe/ZnTe type-II core/shell spherical quantum dot

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Ainane, Abdelmajid
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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http://www.sciencedirect.com/science/article/pii/S0749603616314513
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Citation

Chafai, A., Dujardin, F., Essaoudi, I., & Ainane, A. (2017). Energy spectrum of an exciton in a CdSe/ZnTe type-II core/shell spherical quantum dot. Superlattices and Microstructures, 101, 40-48. doi:10.1016/j.spmi.2016.11.017.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-38C3-1

Abstract

The binding energy of an exciton inside a CdSe/ZnTe core/shell spherical quantum dot was theoretically examined taking into account the dependence of the dielectric constant and charge carriers effective mass on radius, and using the envelope function approximation. Such a structure presents original optical and electronic properties because of the spatial separation of electrons and holes caused by the type-II alignment of energy states. The mean distance between the electron and hole was calculated variationally using a trial function taking into account the coulomb interaction between charge carriers. Our numerical results provide a description to the size dependence of the binding energy of an exciton inside a core/shell nanoheterostructure type-II. Indeed, by controlling the inner and outer radii, we can precisely control the energy spectrum of the exciton. (C) 2016 Elsevier Ltd. All rights reserved.