TEMPERATURE AND SHELL THICKNESS EFFECTS ON THE OPTICAL PROPERTIES OF II-VI SEMICONDUCTOR CORE-SHELL ENSEMBLES

1 DE LA CRUZ Rosa María
Co-authors:
2 KANYINDA-MALU Clément 1 DE LA TORRE Amadeo
Institutions:
1 Dpto. De Física, EPS, Universidad Carlos III de Madrid, Spain, rmc@fis.uc3m.es
2 Dpto. de Economía Financiera y Contabilidad, Universidad Rey Juan Carlos, FCSJ, Spain, clement.kanyindamalu@urjc.es
Conference:
8th International Conference on Nanomaterials - Research & Application, Hotel Voronez I, Brno, Czech Republic, EU, October 19th - 21st 2016
Proceedings:
Proceedings 8th International Conference on Nanomaterials - Research & Application
Pages:
207-212
ISBN:
978-80-87294-71-0
ISSN:
2694-930X
Published:
17th March 2017
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
15 views / 5 downloads
Abstract

We have investigated the temperature and shell thickness effects on the extinction and photoluminescence (PL) optical properties in II-VI semiconductor core-shells of type I. To this purpose, we used Maxwell-Garnett (M-G) effective theory by defining appropriate dielectric functions for the constitutive materials of the core-shells. We have obtained one sharp resonant peak which can be related to the 1Sh→1Se optical transition, which is red-shifted with the increase of shell thickness. This peak is also red-shifted with increasing temperature due to core shrinking band gap described by Varshni´s law. For the PL spectra, we have considered radiative and non-radiative decay rates as the main processes that can lead to the carrier relaxation. The Stokes shift between the absorption- and PL- peaks is of the order of a few meV. Finally, our findings are similar to that reported in the literature in absorption and PL experimental spectra.

Keywords: Semiconductor nanostructures, Maxwell-Garnett theory, optical properties
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