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Title: Orientationally textured thin films of WOx deposited by pulsed laser deposition
Authors: Caruana, Andrew J.
Cropper, Michael D.
Keywords: Pulsed laser deposition
Thin film structure and morphology
Tungsten trioxide
X-ray diffraction
Issue Date: 2014
Publisher: © Institute of Physics
Citation: CARUANA, A.J. and CROPPER, M.D., 2014. Orientationally textured thin films of WOx deposited by pulsed laser deposition. Materials Research Express, 1 (4), 046408.
Abstract: Pulsed laser deposition from a compound target in an oxygen atmosphere has been used to produce sub-stoichiometric WOx films of 30 nm thickness on Si(100) and SrTiO3(100) substrates. The growth temperature was 500 °C and the pressure of the O2 background was 2.5 × 10−2 mbar. The films have been assessed using x-ray photoelectron spectroscopy, x-ray reflectivity (XRR), x-ray diffraction (XRD) and scanning electron microscopy. The chemical shift of the tungsten 4f states showed that the tungsten was close to fully oxidized. XRR measurements and scanning electron micrographs showed the films on SrTiO3(100) to be much smoother than those on Si(100) which were granular. XRD in the Bragg–Brentano geometry combined with texture analysis showed that the films were textured with the [001], [010], [100] directions normal to the surface. The films on SrTiO3(100) were found to be biaxially textured with the film directions aligning with those in the substrate. The nature of the texture was sensitive to the laser fluence used. Higher fluence promoted [001] texture whereas lower fluence promoted [010] and [100]. Intermediate fluences produced smooth, highly ordered films with biaxial texture. Investigations using the laser repetition rate indicate that the mechanism for the difference is the overall deposition rate, which is affected by fluence. On Si(100) the films were rougher and exhibited only uniaxial texture.
Description: This article was published in the journal, Materials Research Express [© Institute of Physics] and the definitive version is available at: http://dx.doi.org/10.1088/2053-1591/1/4/046408
Version: Accepted for publication
DOI: 10.1088/2053-1591/1/4/046408
URI: https://dspace.lboro.ac.uk/2134/16458
Publisher Link: http://dx.doi.org/10.1088/2053-1591/1/4/046408
Appears in Collections:Published Articles (Physics)

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