Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/30373
Title: Improved anatase phase stability in small diameter TiO2 nanotube arrays for high performance dye-sensitized solar cells
Authors: Liu, X
Lin, J
Tsang, YH 
Chen, X
Hing, P
Huang, H 
Keywords: Dye-sensitized solar cells
Electron recombination
Phase transitions
Small diameter nanotube
Issue Date: 2014
Publisher: Elsevier
Source: Journal of alloys and compounds, 2014, v. 607, p. 50-53 How to cite?
Journal: Journal of alloys and compounds 
Abstract: Anatase is the preferred phase of TiO2 in dye-sensitized solar cells (DSSCs) because of its lower charge recombination than other phases. However, for small diameter nanotubes before detached from the Ti foil, rutile rather than anatase appears upon a pre-treatment annealing at 400 °C or above. Here we have fabricated highly ordered free-standing small diameter (50 nm) TiO2 nanotube membranes which were pre-treated at 300 °C to maintain pure anatase phase. The free-standing nanotube membranes were used to fabricate the photoanodes and were further calcined at 500 °C to achieve full crystallization of the nanotubes. It was shown that the electron lifetime is much longer in the 300 °C-pre-treated nanotubes than those pre-treated at 400 or 500 °C, leading to a significantly improved power conversion efficiency of 4.59% (enhanced by ∼50%).
URI: http://hdl.handle.net/10397/30373
ISSN: 0925-8388
DOI: 10.1016/j.jallcom.2014.04.083
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