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Surface state modulation through wet chemical treatment as a route to controlling the electrical properties of ZnO nanowire arrays investigated with XPS

Lord, Alex M., Maffeis, Thierry G., Allen, Martin W., Morgan, David John, Davies, Philip Rosser, Jones, Daniel R., Evans, Jonathan E., Smith, Nathan A. and Wilks, Steve P. 2014. Surface state modulation through wet chemical treatment as a route to controlling the electrical properties of ZnO nanowire arrays investigated with XPS. Applied Surface Science 320 , pp. 664-669. 10.1016/j.apsusc.2014.09.078

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Abstract

ZnO is a wide bandgap semiconductor that has many potential applications including solar cell electrodes, transparent thin film transistors and gas/biological sensors. Since the surfaces of ZnO materials have no amorphous or oxidised layers, they are very environmentally sensitive, making control of their semiconductor properties challenging. In particular, the electronic properties of ZnO nanostructures are dominated by surface effects while surface conduction layers have been observed in thin films and bulk crystals. Therefore, the ability to use the ZnO materials in a controlled way depends on the development of simple techniques to modulate their surface electronic properties. Here, we use monochromatic x-ray photoelectron spectroscopy (XPS) to investigate the use of different wet chemical treatments (EtOH, H2O2) to control the electronic properties of ZnO nanowires by modulating the surface depletion region. The valence band and core level XPS spectra are used to explore the relationship between the surface chemistry of the nanowires and the surface band bending.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Chemistry
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: ZnO; Nanowires; Surface depletion; Electrical properties; Surface chemistry; XPS
Publisher: Elsevier
ISSN: 0169-4332
Date of First Compliant Deposit: 3 June 2016
Date of Acceptance: 13 September 2014
Last Modified: 29 Jun 2019 16:41
URI: http://orca.cf.ac.uk/id/eprint/66702

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