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International Journal of Photoenergy
Volume 2016, Article ID 8523150, 9 pages
Research Article

Impedance Spectroscopic Investigation of the Degraded Dye-Sensitized Solar Cell due to Ageing

1Department of Solar Energy, School of Technology, Pandit Deendayal Petroleum University, Gandhinagar 382007, India
2Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OXI 3QR, UK
3Department of Electrical Engineering, Incheon National University, Incheon 406772, Republic of Korea
4Department of Science, School of Technology, Pandit Deendayal Petroleum University, Gandhinagar 382007, India

Received 19 July 2016; Accepted 9 November 2016

Academic Editor: Francisco R. Zepeda

Copyright © 2016 Parth Bhatt 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.


This paper investigates the effect of ageing on the performance of dye-sensitized solar cells (DSCs). The electrical characterization of fresh and degraded DSCs is done under AM1.5G spectrum and the current density-voltage (J-V) characteristics are analyzed. Short circuit current density () decreases significantly whereas a noticeable increase in open circuit voltage is observed. These results have been further investigated electroanalytically using electrochemical impedance spectroscopy (EIS). An increase in net resistance results in a lower for the degraded DSC. This decrease in current is mainly due to degradation of TiO2-dye interface, which is observed from light and dark J-V characteristics and is further confirmed by EIS measurements. A reduction in the chemical capacitance of the degraded DSC is observed, which is responsible for the shifting of Fermi level with respect to conduction band edge that further results in an increase of open circuit voltage for the degraded DSC. It is also confirmed from EIS that the degradation leads to a better contact formation between the electrolyte and Pt electrode, which improves the fill factor of the DSC. But the recombination throughout the DSC is found to increase along with degradation. This study suggests that the DSC should be used under low illumination conditions and around room temperature for a longer life.