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Influence of morphology on the blinking mechanisms and the excitonic fine structure of single colloidal nanoplatelets

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Abstract

Colloidal semiconductor nanoplatelets with a similar electronic structure as quantum wells have recently emerged as exciting materials for optoelectronic applications. Here we investigate how morphology affects important photoluminescence properties of single CdSe and core/shell CdSe/CdZnS nanoplatelets. By analyzing photoluminescence intensity-lifetime correlation and second-order photon correlation results, we demonstrate that, irrespective of the morphology, Auger recombination plays only a minor role in dictating the blinking behavior of the nanoplatelets. We find that a rough shell induces additional nonradiative channels presumably related to defects or traps of an imperfect shell. Furthermore, polarization-resolved spectroscopy analysis reveals exciton fine-structure splitting of the order of several tens of meV in rough-shell nanoplatelets at room temperature, which is attributed to exciton localization and is substantiated by theoretical calculations taking into account the nanoplatelet shape and electron–hole exchange interaction.

Graphical abstract: Influence of morphology on the blinking mechanisms and the excitonic fine structure of single colloidal nanoplatelets

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Publication details

The article was received on 02 Aug 2018, accepted on 08 Nov 2018 and first published on 08 Nov 2018


Article type: Paper
DOI: 10.1039/C8NR06234J
Citation: Nanoscale, 2018, Advance Article
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    Influence of morphology on the blinking mechanisms and the excitonic fine structure of single colloidal nanoplatelets

    Z. Hu, A. Singh, S. V. Goupalov, J. A. Hollingsworth and H. Htoon, Nanoscale, 2018, Advance Article , DOI: 10.1039/C8NR06234J

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