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XRD pattern and TEM images of the as-prepared : XRD pattern and TEM image [(a), (b), and (c)], HRTEM images [(d) and (e)]. Cross-section SEM images for films prepared from [(f) and (g)] the RTNs and [(h) and (i)] P25 . [(f) and (i)] Show high-magnification SEM images. The films were formed by doctor-blade method, and subsequently heated for 40 min at .
(a) Current-voltage characteristics and (b) IPCE spectra of the dye-sensitized solar cells based on the RTN and P25 films of the same thickness (about ). Platinum-coated FTO was used as a counter electrode. The electrolyte was composed of LiI, , dimethylpropylimidazolium iodide and tert-butylpyridine in dry acetonitrile. The two active electrode areas were about .
Optical spectra of the films prepared from RTNs and P25 of the same thickness (about ) before and after dye sensitization. Inset shows their reflectance spectra before dye sensitization.
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