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Mapping the Origins of Luminescence in ZnO Nanowires by STEM-CL

Kennedy, OW; White, ER; Howkins, A; Williams, CK; Boyd, IW; Warburton, PA; Shaffer, MSP; (2019) Mapping the Origins of Luminescence in ZnO Nanowires by STEM-CL. Journal Of Physical Chemistry Letters , 10 (3) pp. 386-392. 10.1021/acs.jpclett.8b03286. Green open access

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Abstract

In semiconductor nanowires, understanding both the sources of luminescence (excitonic recombination, defects, etc.) and the distribution of luminescent centers (be they uniformly distributed, or concentrated at structural defects or at the surface) is important for synthesis and applications. We develop scanning transmission electron microscopy−cathodoluminescence (STEM-CL) measurements, allowing the structure and cathodoluminescence (CL) of single ZnO nanowires to be mapped at high resolution. Using a CL pixel resolution of 10 nm, variations of the CL spectra within such nanowires in the direction perpendicular to the nanowire growth axis are identified for the first time. By comparing the local CL spectra with the bulk photoluminescence spectra, the CL spectral features are assigned to internal and surface defect structures. Hyperspectral CL maps are deconvolved to enable characteristic spectral features to be spatially correlated with structural features within single nanowires. We have used these maps to show that the spatial distribution of these defects correlates well with regions that show an increased rate of nonradiative transitions.

Type: Article
Title: Mapping the Origins of Luminescence in ZnO Nanowires by STEM-CL
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acs.jpclett.8b03286
Publisher version: https://doi.org/10.1021/acs.jpclett.8b03286
Language: English
Additional information: This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited. https://creativecommons.org/licenses/by/4.0/
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10072588
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