Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/19196
Title: High temperature crystallization of free-standing anatase TiO2 nanotube membranes for high efficiency dye-sensitized solar cells
Authors: Lin, J
Guo, M
Yip, CT
Lu, W
Zhang, G
Liu, X
Zhou, L 
Chen, X
Huang, H 
Keywords: Crystallization
Electron transport
Nanotube arrays
Solar cells
Trap states
Issue Date: 2013
Publisher: Wiley-VCH
Source: Advanced functional materials, 2013, v. 23, no. 47, p. 5952-5960 How to cite?
Journal: Advanced functional materials 
Abstract: Despite the one-dimensional ordering of anodic TiO2 nanotube arrays (TNAs), the electron diffusion towards the substrate in TNA-based dye-sensitized solar cells (DSSCs) is comparably slow. The improvement of electron mobility by enhancing TNA crystallinity under high-temperature annealing, however, is infeasible with the existence of Ti metal substrate. Herein, it is shown that, by high temperature (up to 700°C) crystallization of high-quality free-standing TNA membranes, the TNAs can maintain their structure integrity and phase (anatase) stability as a result of the absence of the nucleation sites and the high quality of the membrane obtained by a self-detachment method. The electron transport is much faster (≈4 times) in the 700°C-annealed TNA membranes than that in the 400°C-treated ones for 20 μm-length nanotubes, which is mainly attributed to the improved crystallinity and reduced electron trap states. In spite of slightly reduced dye loading capacity (decreased by ≈30%) in the 700°C-annealed membranes, the superior electron transport leads to a significantly improved efficiency of 7.81% (enhanced by ≈50%). The strategy of manipulating the electron transport dynamics by high temperature treatment on high-quality TNA membranes may open new route for further improvement in the performances of TNA-based DSSCs.
URI: http://hdl.handle.net/10397/19196
ISSN: 1616-301X
DOI: 10.1002/adfm.201301066
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