Hierarchical TiO2 Photoanode for Dye-Sensitized Solar Cells

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...

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Bibliographic Details
Published in:Nano letters 2010-07, Vol.10 (7), p.2562-2567
Main Authors: Sauvage, F, Di Fonzo, F, Li Bassi, A, Casari, C. S, Russo, V, Divitini, G, Ducati, C, Bottani, C. E, Comte, P, Graetzel, M
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Diffusion in nanoscale solids
Diffusion in solids
Energy
Exact sciences and technology
Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties
Natural energy
Photovoltaic conversion
Physics
Solar cells. Photoelectrochemical cells
Solar energy
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Transport properties of condensed matter (nonelectronic)
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Summary: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.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl101198b