Photoelectrochemical and physical properties of tungsten trioxide films obtained by aerosol pyrolysis

Aerosol pyrolysis (AP) was used for preparing semiconducting films of tungsten trioxide using peroxotungstic acid as a precursor. The films were characterized by SEM, XRD, and by their photoelectrochemical response. Porous, polycrystalline (monoclinic) films of thickness up to 3 μm were prepared. An incident photon to current efficiency (IPCE) of 0.55 at 365 nm was obtained for films of 1 μm thickness on conducting F:SnO₂/glass substrates under depletion conditions, in junctions with aqueous electrolytes. The spectral (photocurrent) response extended into the visible region (up to 470 nm) which is of importance for solar applications like photocatalysis.