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

Hu, Zhongjian; Singh, Ajay; Goupalov, Serguei; Hollingsworth, Jennifer; Htoon, Han

doi:10.1039/C8NR06234J

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

Journal Article · Thu Nov 08 00:00:00 EST 2018 · Nanoscale

DOI:https://doi.org/10.1039/C8NR06234J· OSTI ID:1482958

^[1]; Singh, Ajay ^[1]; Goupalov, Serguei ^[2]; ^[1]; ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Jackson State Univ., Jackson, MS (United States); Ioffe Institute, St. Petersburg (Russia)

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. However, 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.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: LDRD; USDOE

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1482958

Alternate ID(s):: OSTI ID: 1483902

Report Number(s):: LA-UR--18-28802

Journal Information:: Nanoscale, Journal Name: Nanoscale Journal Issue: 48 Vol. 10; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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