Abstract
Two interfaces with opposite orientations of the built-in electric field, nanoporousTiO2 film/ FTO electrodeand nanoporous TiO2 film/semitransparent Pt substrate, were constructed. The separation andtransport of photo-induced charge carriers in the two systems of nanoporousTiO2/conductive substrate were studied by the transient photovoltage technique. Various transient photovoltageresponses were obtained when the laser beam was incident from the surface of the nanoporousTiO2 film (topillumination) or the TiO2/substrate interface (bottom illumination). A linear and a logarithmic dependence ofthe photovoltage amplitude on the excitation level were observed for topillumination and bottom illumination, respectively. The results indicate thatdiffusion is the major way for the separation of charge carriers in the nanoporousTiO2 film and that the excess carriers were separated by drift under the built-in electric field at theTiO2/substrate interfaces.
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