Inderscience Publishers

Multilayer films of indium tin oxide/TiO 2 codoped with vanadium and nitrogen for efficient photocatalytic water splitting

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TiO
2
films codoped with V cations and N anions were synthesised by RF-magnetron sputtering. The incorporation of V and N in TiO
2
lattice produces isolated energy levels near the conduction and valence bands, respectively, causing an effective narrowing of the band gap to 2.5 eV. Recombination of photo-charges was reduced by depositing multilayer films of indium tin oxide (ITO)/V-N-codoped TiO
2
with different numbers of bilayers. In multilayer structure, the generated photoelectrons, travelling into TiO
2
film of limited thickness, rapidly enter the space charge interface of the ITO/TiO
2
films from where they are instantaneously injected into the ITO layer and then removed towards the cathode. The synergic effects created by band narrowing and enhanced charge separation by using codoping and multilayer structure strategy in TiO
2
generate higher photocurrent for water splitting under visible light which definitely exceeds that obtained by doping TiO
2
with a single, V or N, element.

Keywords: nanotechnology, V and N codoped TiO 2, photocatalytic water splitting, multilayer structure, visible light irradiation, thin films RF-magnetron sputtering, photoelectrochemical cell, charge recombination in TiO 2, TiO 2 red-shift, Green technology.

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