Abstract
Elaboration of 0-10 wt.% Fe-doped SnO2 thin films using spray pyrolysis technique on 480 degrees C heated glass with moving nozzle. Tin(II) chloride SnCl2 and iron(III) chloride FeCl3 were employed as sources of SnO2 and Fe doping, respectively. The structural, opticaland electrical characteristics of pure SnO2 and Fe-doped SnO2 thin films with different ratios weight Fe/Sn were studied. Transmittance spectra of all the thin films display high transparency more than 78% in the visible region. The optical gap of the thin films was found to be in 3.56-3.80eV range. In general, XRD shows polycrystalline structures with cassiterite tetragonal crystal phase with apreferential orientation for non-doped SnO2 toward (211) plane then shifts from (211) to (110) planes for 1, 2 and 4 wt. %. The values of crystallite size, along the preferred orientation, were found to be in 36.11-56.99nm range. SEM survey of the surface morphology shows that the whole substrates are well covered by SnO2 uniform surface with few numbers of pores. Those pores density increases with increasing iron doping.Electrical resistivity increases from 1.2x10(-4) to 3.4 x10(-3)Omega cm.The Hall effect measurements have shown n-type for pure SnO2 then the type conductivity changes to p-type for Fe-doped SnO2 thin filmsover 2 wt.%.