Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/17458
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
Issue Date: 7-Jan-2019
Publisher: American Chemical Society
Citation: Journal of Physical Chemistry Letters, 2019, 10 pp. 386 - 392
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.
URI: http://bura.brunel.ac.uk/handle/2438/17458
DOI: http://dx.doi.org/10.1021/acs.jpclett.8b03286
ISSN: http://dx.doi.org/10.1021/acs.jpclett.8b03286
Appears in Collections:Materials Engineering

Files in This Item:
File Description SizeFormat 
FullText.pdf3.05 MBAdobe PDFView/Open


Items in BURA are protected by copyright, with all rights reserved, unless otherwise indicated.