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International Journal of Photoenergy
Volume 2014 (2014), Article ID 602692, 8 pages
Research Article

TiO2 Nanotube Arrays Composite Film as Photoanode for High-Efficiency Dye-Sensitized Solar Cell

1Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Wuhan 430062, China
2Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Faculty of Materials Science and Engineering, Hubei University, Wuhan 430062, China
3School of Science, Wuhan University of Technology, Wuhan 430070, China

Received 7 April 2014; Revised 9 May 2014; Accepted 12 May 2014; Published 25 May 2014

Academic Editor: Wei Xiao

Copyright © 2014 Jinghua Hu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A double-layered photoanode made of hierarchical TiO2 nanotube arrays (TNT-arrays) as the overlayer and commercial-grade TiO2 nanoparticles (P25) as the underlayer is designed for dye-sensitized solar cells (DSSCs). Crystallized free-standing TNT-arrays films are prepared by two-step anodization process. For photovoltaic applications, DSSCs based on double-layered photoanodes produce a remarkably enhanced power conversion efficiency (PCE) of up to 6.32% compared with the DSSCs solely composed of TNT-arrays (5.18%) or nanoparticles (3.65%) with a similar thickness (24 μm) at a constant irradiation of 100 mW cm−2. This is mainly attributed to the fast charge transport paths and superior light-scattering ability of TNT-arrays overlayer and good electronic contact with F-doped tin oxide (FTO) glass provided from P25 nanoparticles as a bonding layer.