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International Journal of Chemical Engineering
Volume 2009 (2009), Article ID 563420, 7 pages
http://dx.doi.org/10.1155/2009/563420
Research Article

Influence of Different Cations of N3 Dyes on Their Photovoltaic Performance and Stability

1Laboratory for Process, Environment and Energy Engineering (LEPAE), Department of Chemical Engineering, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
2Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology, 1015 Lausanne, Switzerland

Received 16 October 2008; Accepted 13 January 2009

Academic Editor: Eugénio C. Ferreira

Copyright © 2009 Luísa Andrade 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

The N3 dye was modified by substituting two of its protons by potassium or sodium cations. The performance and stability of dye-sensitized solar cells incorporating the new dyes were evaluated under light soaking at . Photocurrent measurements demonstrated that proton substitution by potassium cations rends the system more stable. Further characterization of the potassium-based devices was performed by electrochemical impedance spectroscopy to investigate the charge-transfer phenomena occurring at the different interfaces of the cells.