Structural, electrical and optical properties of TiO 2 doped WO 3 thin films

P. S. Patil, S. H. Mujawar, A. I. Inamdar, P. S. Shinde, H. P. Deshmukh, S. B. Sadale

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

TiO 2 doped WO 3 thin films were deposited onto glass substrates and fluorine doped tin oxide (FTO) coated conducting glass substrates, maintained at 500 °C by pyrolytic decomposition of adequate precursor solution. Equimolar ammonium tungstate ((NH 4 ) 2 WO 4 ) and titanyl acetyl acetonate (TiAcAc) solutions were mixed together at pH 9 in volume proportions and used as a precursor solution for the deposition of TiO 2 doped WO 3 thin films. Doping concentrations were varied between 4 and 38%. The effect of TiO 2 doping concentration on structural, electrical and optical properties of TiO 2 doped WO 3 thin films were studied. Values of room temperature electrical resistivity, thermoelectric power and band gap energy (E g ) were estimated. The films with 38% TiO 2 doping in WO 3 exhibited lowest resistivity, n-type electrical conductivity and improved electrochromic performance among all the samples. The values of thermoelectric power (TEP) were in the range of 23-56 μV/K and the direct band gap energy varied between 2.72 and 2.86 eV.

Original languageEnglish
Pages (from-to)1643-1650
Number of pages8
JournalApplied Surface Science
Volume252
Issue number5
DOIs
StatePublished - 15 Dec 2005

Keywords

  • Electrical and structural properties
  • Electrochromism
  • Optical
  • Spray pyrolysis technique
  • TiO doped WO thin films

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