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Pulsed laser deposition of W–V–O composite films: Preparation, characterization and gasochromic studies

  • Academic Journal
  • Solar Energy Materials & Solar Cells. Aug2008, Vol. 92 Issue 8, p878-883. 6p.
  • Abstract: 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=1064nm, from mixed pressed powders of (WO3)1− x (V2O5) x , x=0, 0.09, 0.17, 0.23, 0.29 and 0.33, at 13.3Pa 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. [Copyright &y& Elsevier]
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