Influence of core-shell interfaces on exciton and multi-exciton dynamics of CdSe-CdxZn1-xS quantum dots

Alessandro Minotto; Francesco Todescato; Raffaella Signorini; Jacek J. Jasieniak; Renato Bozio

doi:10.1117/12.2060973

10 September 2014 Influence of core-shell interfaces on exciton and multi-exciton dynamics of CdSe-Cd_xZn_1-xS quantum dots

Alessandro Minotto, Francesco Todescato, Raffaella Signorini, Jacek J. Jasieniak, Renato Bozio

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Proceedings Volume 9161, Nanophotonic Materials XI; 916103 (2014) https://doi.org/10.1117/12.2060973
Event: SPIE NanoScience + Engineering, 2014, San Diego, California, United States

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/Cd_xZn1_-xScore-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.

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Alessandro Minotto, Francesco Todescato, Raffaella Signorini, Jacek J. Jasieniak, and Renato Bozio "Influence of core-shell interfaces on exciton and multi-exciton dynamics of CdSe-Cd_xZn_1-xS quantum dots", Proc. SPIE 9161, Nanophotonic Materials XI, 916103 (10 September 2014); https://doi.org/10.1117/12.2060973

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KEYWORDS

Zinc

Cadmium sulfide

Quantum dots

Absorption

Excitons

Interfaces

Zirconium dioxide

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