Imperial College London
Alternate

PROFESSOR CHARLOTTE K. WILLIAMS

Faculty of Natural Sciences, Department of Chemistry

Visiting Professor
 
 
 
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Contact

 

+44 (0)20 7594 5790c.k.williams Website

 
 
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Location

 

317 RCS1ChemistrySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Kennedy:2019:10.1021/acs.jpclett.8b03286,
author = {Kennedy, OW and White, ER and Howkins, A and Williams, CK and Boyd, IW and Warburton, PA and Shaffer, MSP},
doi = {10.1021/acs.jpclett.8b03286},
journal = {Journal of Physical Chemistry Letters},
pages = {386--392},
title = {Mapping the origins of luminescence in ZnO nanowires by STEM-CL},
url = {http://dx.doi.org/10.1021/acs.jpclett.8b03286},
volume = {10},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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.
AU  - Kennedy,OW
AU  - White,ER
AU  - Howkins,A
AU  - Williams,CK
AU  - Boyd,IW
AU  - Warburton,PA
AU  - Shaffer,MSP
DO  - 10.1021/acs.jpclett.8b03286
EP  - 392
PY  - 2019///
SN  - 1948-7185
SP  - 386
TI  - Mapping the origins of luminescence in ZnO nanowires by STEM-CL
T2  - Journal of Physical Chemistry Letters
UR  - http://dx.doi.org/10.1021/acs.jpclett.8b03286
UR  - https://www.ncbi.nlm.nih.gov/pubmed/30614706
UR  - http://hdl.handle.net/10044/1/66764
VL  - 10
ER  -
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