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Stability of fast elaborated small CdS quantum dots

Published online by Cambridge University Press:  02 March 2011

M. Fregnaux ,
S. Dalmasso ,
J.-J. Gaumet  and
J.-P. Laurenti
M. Fregnaux
Affiliation:
Laboratoire de Physique des Milieux Denses Laboratoire de Spectrométrie de Masse et de Chimie Laser Institut Jean Barriol, Université Paul Verlaine – Metz, 1 Boulevard Arago, F-57078 Metz Cedex 03
S. Dalmasso
Affiliation:
Laboratoire de Physique des Milieux Denses
J.-J. Gaumet
Affiliation:
Laboratoire de Spectrométrie de Masse et de Chimie Laser Institut Jean Barriol, Université Paul Verlaine – Metz, 1 Boulevard Arago, F-57078 Metz Cedex 03
J.-P. Laurenti
Affiliation:
Laboratoire de Physique des Milieux Denses
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Abstract

Small size CdS QDs were synthesized by (i) the single source precursor methodology and by (ii) the microwave synthetic route. The consequences of CdS QD direct exposure to air for a period of 7 days were investigated by following the evolution of the photoluminescence (PL) and absortion spectra. For QDs obtained by (i), the excitonic emission band (3.0 ‑ 3.1 eV) decreases in intensity, relatively to the low energy one (2.2 ‑ 2.5 eV) tentatively associated to midgap surface states. This suggests arising of new recombination path(s) associated to degradations during aging, possibly an oxidative formation of a CdO surface layer. On the other hand, no significant change is observed in the absorption spectra. For QDs obtained by (ii), no degradation is revealed by the PL spectra which remain unchanged. On the other hand, the absorption spectra are dominated by an unexplained broad band around 3.6 eV which tends to hide the fundamental excitonic transition one and increases in intensity with aging.

Keywords

nanostructureoptical propertiesII-VI
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1286: Symposium E – Molecular and Hybrid Materials for Electronics and Photonics , 2011 , mrsf10-1286-e08-36
Copyright
Copyright © Materials Research Society 2011

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