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Pulsed laser deposition of W-V-O composite films: preparation, characterization and gasochromic studies

Ranjbar, M ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. DOI: 10.1016/j.solmat.2008.02.018
  3. Publisher: 2008
  4. Abstract:
  5. Modified tungsten oxide films by vanadium oxide provide neutrally coloring electrochromic electrodes for smart windows technology. In this study W-V-O mixed oxide films were fabricated by Nd:YAG pulsed laser deposition (PLD), λ=1064 nm, from mixed pressed powders of (WO3)1-x(V2O5)x, x=0, 0.09, 0.17, 0.23, 0.29 and 0.33, at 13.3 Pa oxygen partial pressure and 200 °C temperature on glass substrates. X-ray photoelectron spectroscopy (XPS) revealed V5+, V4+, W6+ and W5+ surface oxide states, where the ratio of W5+/W6+ enhances by the amount of vanadium in the films. Surface morphology was studied by scanning electron microscope (SEM) and optical properties by transmission-reflection spectra. Results showed that films with a low amount of vanadium oxide have better porosity and higher optical band gaps. The gasochromic response to hydrogen gas exposure was found better for x=0.09 in the sense of both deeper and faster coloring. Weak responses of samples with more vanadium oxide were attributed to higher amounts of W5+ in the films and also to lower porosity. © 2008 Elsevier B.V. All rights reserved
  6. Keywords:
  7. Chemical modification ; Electrochromic devices ; Oxide films ; Pulsed laser deposition ; Scanning electron microscopy ; X ray photoelectron spectroscopy ; Electrochromic electrodes ; Pulsed laser deposition (PLD) ; Tungsten oxide ; Vanadium oxide ; Composite films
  8. Source: Solar Energy Materials and Solar Cells ; Volume 92, Issue 8 , 2008 , Pages 878-883 ; 09270248 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0927024808000548