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International Journal of Photoenergy
Volume 2009, Article ID 786429, 15 pages
http://dx.doi.org/10.1155/2009/786429
Research Article

Investigation of Temperature and Aging Effects in Nanostructured Dye Solar Cells Studied by Electrochemical Impedance Spectroscopy

Department of Applied Physics, Advanced Energy Systems, Helsinki University of Technology, P.O. Box 5100, 02015 TKK, Finland

Received 17 November 2008; Revised 28 May 2009; Accepted 6 August 2009

Academic Editor: A. Hagfeldt

Copyright © 2009 Minna Toivola 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.

Abstract

Effects of aging and cyclically varying temperature on the electrical parameters of dye solar cells were analyzed with electrochemical impedance spectroscopy. Photoelectrode total resistance increased as a function of time due to increasing electron transport resistance in the film. On the other hand, photoelectrode recombination resistance was generally larger, electron lifetimes in the were film longer, and charge transfer resistance on the counter electrode was smaller after the temperature treatments than before them. These effects correlated with the slower deterioration rate of the temperature-treated cells, in comparison to the reference cells.