Mapping the origins of luminescence in ZnO nanowires by STEM-CL

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Title: Mapping the origins of luminescence in ZnO nanowires by STEM-CL
Authors: Kennedy, OW
White, ER
Howkins, A
Williams, CK
Boyd, IW
Warburton, PA
Shaffer, MSP
Item Type: Journal Article
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.
Issue Date: 7-Feb-2019
Date of Acceptance: 6-Jan-2019
ISSN: 1948-7185
Publisher: American Chemical Society
Start Page: 386
End Page: 392
Journal / Book Title: Journal of Physical Chemistry Letters
Volume: 10
Issue: 3
Copyright Statement: © 2019 American Chemical Society. 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.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/K035274/1
Keywords: 03 Chemical Sciences
02 Physical Sciences
Publication Status: Published
Conference Place: United States
Online Publication Date: 2019-01-07
Appears in Collections:Chemistry
Faculty of Natural Sciences

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