Abstract
In order to possess the merits of both building blocks, i.e. the rapid interfacial electron transport of TiO 2-B narrow nanobelts (NBs) and the high surface area of TiO 2 nanoparticles (NPs), the TiO 2-B NBs and TiO 2 NPs composites photoelectrodes were prepared with different weight ratios. The dye-sensitized solar cell prototypes were fabricated based on the composite photoelectrodes and the photoelectrical properties have been systematically studied. Although the amount of adsorption dye of composite solar cells decreased, the composite cells could obtain higher power conversion efficiency compared to pure TiO 2 NP solar cell by rational tuning the weight ratio of TiO 2-B NBs and TiO 2 NPs, which was due to the faster electron transfer rate. The dye adsorption amount and interfacial electron transport, which together determined the overall photoelectrical conversion efficiency, were investigated by the UV–vis spectra, the electrochemical impedance spectra (EIS), intensity-modulated photocurrent spectroscopy (IMPS) and intensity-modulated photovoltage spectroscopy (IMVS).
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