Fatemeh Rahimi Jafari - Departmentof Physics, Shahrood University, Shahrood, Iran
Hosein Eshghi - Departmentof Physics, Shahrood University, Shahrood, Iran
Zohreh Ghorannevis - Department of Physics, Islamic Azad University of Karaj, Karaj, Iran

In this research work we deposited pure tungsten trioxide (WO3) thin film with various substratetemperatures (500, 400, 300 ºC) on glass substrates by spray pyrolysis technique. The FESEM images show that as thegrowth temperature has decreased the surface of the layers became more porous with more intertwined circular strings.Also the XRD spectra of the layers indicated that all grown samples have an amorphous nature. The Seebeck effect andI-V characteristics of the layers showed while all layers have n-type conductivity, the layer with the lower growthtemperature is more conductive than those grown at higher temperatures. These results are well-consistent with theoptical properties of the films including transmittance spectra also the trend of the band gap variations.

WO3;nano-structured film; substrate temperature