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 language | English |
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Pages (from-to) | 1643-1650 |
Number of pages | 8 |
Journal | Applied Surface Science |
Volume | 252 |
Issue number | 5 |
DOIs | |
State | Published - 15 Dec 2005 |
Keywords
- Electrical and structural properties
- Electrochromism
- Optical
- Spray pyrolysis technique
- TiO doped WO thin films