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Proceedings Paper

Influence of core-shell interfaces on exciton and multi-exciton dynamics of CdSe-CdxZn1-xS quantum dots
Author(s): Alessandro Minotto; Francesco Todescato; Raffaella Signorini; Jacek J. Jasieniak; Renato Bozio
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Paper Abstract

Semiconductor quantum dots possess attractive optical properties useful in the photonic field. Thanks to the evolution of core-shell colloidal synthesis, quantum dots exhibit almost ideal emitting properties. Their employment in optoelectronic devices is encouraged by their size-tunable emission as well as by their high absorption cross-section and high photoluminescence quantum yield. In this work, starting from the archetypal CdSe based system, the influence of shell thickness and composition on exciton dynamics in CdSe/CdxZn1-xS core-shell QDs is investigated. By means of steadystate and transient optical spectroscopy, single- and multi-exciton recombination processes are characterized and correlated with different shell materials. The present study clarifies why graded CdSe-CdS-Cd0.5Zn0.5-ZnS core-shell represents the best performing heterostructure for optical gain applications, since such quantum dots combine the high radiative rates of CdS with the superior confinement potential of ZnS in a single dot.

Paper Details

Date Published: 10 September 2014
PDF: 8 pages
Proc. SPIE 9161, Nanophotonic Materials XI, 916103 (10 September 2014); doi: 10.1117/12.2060973
Show Author Affiliations
Alessandro Minotto, Univ. degli Studi di Padova (Italy)
Francesco Todescato, Univ. degli Studi di Padova (Italy)
Raffaella Signorini, Univ. degli Studi di Padova (Italy)
Jacek J. Jasieniak, Commonwealth Scientific and Industrial Research Organisation (Australia)
Renato Bozio, Univ. degli Studi di Padova (Italy)


Published in SPIE Proceedings Vol. 9161:
Nanophotonic Materials XI
Stefano Cabrini; Gilles Lérondel; Adam M. Schwartzberg; Taleb Mokari, Editor(s)

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