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Issue 19, 2012
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Densely aligned rutile TiO2 nanorod arrays with high surface area for efficient dye-sensitized solar cells

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Abstract

One-dimensional (1-D) TiO2 nanorod arrays (NRAs) with large inner surface area are desired in dye-sensitized solar cells (DSSCs). So far, good performance of DSSCs based on 1-D rutile TiO2 NRAs remains a challenge mainly owing to their low dye-loading ability resulting from the insufficient specific surface area of 1-D TiO2 nanostructures. In this paper, densely aligned TiO2 NRAs with tunable thickness were grown directly on transparent conductive fluorine-doped tin oxide (FTO) substrates by hydrothermal method, followed by a facile chemical etching route to further increase the specific surface area of the TiO2 NRAs. The etching treatment leads to the split of TiO2 nanorods into secondary nanorods with a reduced diameter, which markedly enlarges the inner surface area of the TiO2 NRAs. The formation of 1-D rutile TiO2 nanotube arrays (NTAs) is observed as well in the etched TiO2 films. Finally, a DSSC efficiency of 5.94% was achieved by utilizing an etched TiO2 NRA as the photoanode, which is so far the best DSSC efficiency that has been reported for the 1-D rutile TiO2 NRA films.

Graphical abstract: Densely aligned rutile TiO2 nanorod arrays with high surface area for efficient dye-sensitized solar cells

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Publication details

The article was received on 08 Jun 2012, accepted on 28 Jul 2012 and first published on 30 Jul 2012


Article type: Paper
DOI: 10.1039/C2NR31431B
Citation: Nanoscale, 2012,4, 5872-5879
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    Densely aligned rutile TiO2 nanorod arrays with high surface area for efficient dye-sensitized solar cells

    M. Lv, D. Zheng, M. Ye, L. Sun, J. Xiao, W. Guo and C. Lin, Nanoscale, 2012, 4, 5872
    DOI: 10.1039/C2NR31431B

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