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International Journal of Photoenergy
Volume 2014, Article ID 650945, 7 pages
Research Article

Evaluation and Optimization to Recycle Used TiO2 Photoelectrode for Dye-Sensitized Solar Cells

Department of Electro-Optical Engineering, Southern Taiwan University of Science and Technology, Tainan 701, Taiwan

Received 7 December 2013; Revised 7 January 2014; Accepted 8 January 2014; Published 16 February 2014

Academic Editor: Minjoong Yoon

Copyright © 2014 Ruei-Tang Chen and Chien-Feng Liao. 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.


This study proposes a method for recycling and activating the titanium oxide (TiO2)/fluorine-doped tin oxide (FTO) photoanode in dye-sensitized solar cells (DSCs) by repeated dye adsorption and desorption processes using various desorption agents. This simple and convenient method could be utilized to activate TiO2 photoelectrodes for DSCs after the long-term operation. The devices are immersed in acidic, alkaline, and neutral media of various concentrations for desorption and then are soaked in the N719 solution again. The optimal device had an overall power conversion efficiency (AM 1.5 G, 100 mW/cm2) with 5 × 10−3 M NaOH solution as a desorption agent being 6.44% better than that of devices that had not undergone recycling and activation.