Role of core-shell interfaces on exciton recombination in CdSe-CdxZn1-xS quantum dots

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

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32 Citations (Scopus)

Abstract

The shell thickness and composition of CdSe-CdxZn1-xS core-shell quantum dots (QDs) are defining parameters for the efficiency of such materials as light emitters. In this work we present a detailed study into the optical absorption and fluorescence properties of CdSe-CdS, CdSe-Cd0.5Zn0.5S, and CdSe-ZnS QDs as a function of shell thickness. Moreover, the single-exciton recombination dynamics of these systems are analyzed by means of a time-correlated single-photon counting technique and directly related to the specific core-shell interfaces of the various QDs studied using a phenomenological kinetic model. The findings from this model highlight the strong role of the core-shell interface on both steady state photoluminescence and exciton recombination dynamics in these systems.
Original languageEnglish
Pages (from-to)24117-24126
Number of pages10
JournalJournal of Physical Chemistry C
Volume118
Issue number41
DOIs
Publication statusPublished - 16 Oct 2014
Externally publishedYes

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