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Hierarchical TiO 2 Photoanode for Dye-Sensitized Solar Cells

2010; American Chemical Society; Volume: 10; Issue: 7 Linguagem: Inglês

10.1021/nl101198b

1530-6992

Frédéric Sauvage, Fabio Di Fonzo, Andrea Li Bassi, Carlo S. Casari, Valeria Russo, Giorgio Divitini, Caterina Ducati, C. E. Bottani, Pascal Comte, Michael Gräetzel,

Analytical Chemistry and Sensors

Hierarchical or one-dimensional architectures are among the most exciting developments in material science these recent years. We present a nanostructured TiO2 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.