Hydrothermal Conversion Deposition of ZnFe2O4 Doped TiO2 Thin Films and their Photovoltaic Response
To improve its visible light response capability, a new narrow bandgap zinc ferrite semiconductor was in-situ introduced into the matrix of titanium dioxide nano film. ZnFe2O4 doped TiO2 composite films have been successfully formed on glass and stainless steel substrates from aqueous solution through equilibrium reaction between iron (III)-titanium (IV)-fluoric complex and boric acid, followed by in-situ hydrothermal conversion and crystallization in the Zn2+-contained basic environment. The obtained films were densely packed and had no visible cracks; clear photovoltaic responses were observed in the anodic direction, and they were much larger in the presence of ferrite dopant. It is suggested that the shift of the corrosion potential was ascribed to photo-induced charge separation between the conduction band of ZnFe2O4 and its counterpart TiO2 nano-particles.
Wei Pan and Jianghong Gong
Z. H. Guo et al., "Hydrothermal Conversion Deposition of ZnFe2O4 Doped TiO2 Thin Films and their Photovoltaic Response", Key Engineering Materials, Vols. 336-338, pp. 2207-2210, 2007