Hierarchical TiO<sub>2</sub> Photoanode for Dye-Sensitized Solar Cells
F. Sauvage (2284060)F. Di Fonzo (2228305)A. Li Bassi (2184490)C. S. Casari (2184481)V. Russo (2184493)G. Divitini (2285716)C. Ducati (2219365)C. E. Bottani (2228314)P. Comte (2285719)M. Graetzel (2285713)
Abstract
Hierarchical or one-dimensional architectures are among the most exciting developments in material science these recent years. We present a nanostructured TiO<sub>2</sub> assembly combining these two concepts and resembling a forest composed of individual, high aspect-ratio, treelike nanostructures. We propose to use these structures for the photoanode in dye-sensitized solar cells, and we achieved 4.9% conversion efficiency in combination with C101 dye. We demonstrate this morphology beneficial to hamper the electron recombination and also mass transport control in the mesopores when solvent-free ionic liquid electrolyte is used.
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