Abstract
Pure and antimony-doped SnO 2 films have been deposited by two different techniques: metal-organic chemical vapour deposition (MO-CVD) and spray pyrolysis of SnCl 4 in the presence of air with different concentrations of antimony. X-ray and UV photoelectron spectroscopic studies have been carried out on these films and the combined data from these studies provided information about the electronic properties of antimony-doped SnO 2 films and their compositions. That the binding energy of SnO is higher than that of SnO 2, contrary to expectations, is because of the fact that SnO 2 is more covalent than SnO. XPS has been used successfully to confirm the presence of Sb 3+ and Sb 5+ beyond a certain concentration of antimony (0.5 mol%) in the film, which is responsible for the decrease in conductivity and IR reflectivity. UV photoelectron spectroscopy of transparent, conducting SnO 2 films has been reported for the first time. The onset of photoemission in the valence band around 2.6 eV has been explained by invoking the idea of surface states near the valence band below the Fermi level.
Published Version
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