Abstract
Controllable synthesis of the TiO 2-B nanowires (NWs) and nanoparticles (NPs) had been achieved via a facile hydrothermal route, respectively, only by tuning the solution volume. The dye-sensitized solar cells prototypes had been fabricated using TiO 2-B NW and NP electrodes, respectively. The TiO 2-B NP cells had higher photocurrent and photoelectrical conversion efficiency than the TiO 2-B NW cells though the latter exhibited larger photovoltage compared to the former. The key factors such as the photogenerated electron injection drive force, surface defects and the interfacial charge transfer, which determined the photoelectrical properties, had been systematically researched with the surface photovoltage spectra (SPS) and the electrochemical impedance spectra (EIS). The SPS proved that there was larger photoelectron injection drive force in TiO 2-B NP photoelectrode than that in NW photoelectrode. And the electrochemical impedance spectra (EIS) revealed that TiO 2-B NP cells had faster interface charge transfer compared to TiO 2-B NW cells. Both proved that NP cells had the higher photocurrents.
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