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Influence of Morphology on Blinking Mechanisms and Excitonic Fine Structure of Single Colloidal Nanoplatelets

Abstract

Colloidal semiconductor nanoplatelets with electronic structure as quantum wells have recently emerged as exciting materials for optoelectronic applications. Here we investigate how morpholo-gy affects important photoluminescence properties of single CdSe and core/shell CdSe/CdZnS na-noplatelets. By analyzing photoluminescence intensity-lifetime correlation and second-order pho-ton correlation results, we demonstrate that, irrespective of 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 imper-fect shell. Furthermore, polarization-resolved spectroscopy analysis reveals exciton fine-structure splitting on the order of several tens of meV in rough-shell nanoplatelets at room temperature, which is attributed to exciton localization and substantiated with theoretical calculations taking into account the nanoplatelet shape and electron-hole exchange interaction.

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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, Accepted Manuscript
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    Influence of Morphology on Blinking Mechanisms and Excitonic Fine Structure of Single Colloidal Nanoplatelets

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

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