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Microstructure and point defects in CdTe nanowires for photovoltaic applications

Williams, BL; Halliday, DP; Mendis, BG; Durose, K

Microstructure and point defects in CdTe nanowires for photovoltaic applications Thumbnail


BL Williams

K Durose


Defects in Au-catalysed CdTe nanowires vapour–liquid–solid-grown on polycrystalline underlayers have been critically evaluated. Their low-temperature photoluminescence spectra were dominated by excitonic emission with rarely observed above-gap emission also being recorded. While acceptor bound exciton lines due to monovalent metallic impurities (Ag, Cu or Na) were seen, only deeper, donor–acceptor-pair emission could be attributed to the Au contamination that is expected from the catalyst. Annealing under nitrogen acted to enhance the single crystal-like PL emission, whilst oxidizing and reducing anneals of the type that is used in solar cell device processing caused it to degrade. The incidence of stacking faults, polytypes and twins was related only to the growth axes of the wires (⟨111⟩ 50%, ⟨112⟩ 30% and ⟨110⟩ 20%), and was not influenced by annealing. The potential electrical activity of the point and extended defects, and the suitability of these nanowire materials (including processing steps) for solar cell applications, is discussed. Overall they have a quality that is superior to that of thin polycrystalline films, although questions remain about recombination due to Au.


Williams, B., Halliday, D., Mendis, B., & Durose, K. (2013). Microstructure and point defects in CdTe nanowires for photovoltaic applications. Nanotechnology, 24(13), Article 135703.

Journal Article Type Article
Publication Date Apr 5, 2013
Deposit Date Mar 20, 2013
Publicly Available Date Feb 11, 2014
Journal Nanotechnology
Print ISSN 0957-4484
Electronic ISSN 1361-6528
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 24
Issue 13
Article Number 135703
Keywords Condensed matter, Electrical, Magnetic, Optical, Surfaces, Interfaces, Thin films, Nanoscale science, Low-D systems.


Accepted Journal Article (997 Kb)

Copyright Statement
This is an author-created, un-copyedited version of an article accepted for publication in Nanotechnology. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at

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