Table of Contents
ISRN Nanotechnology
Volume 2011 (2011), Article ID 281329, 5 pages
http://dx.doi.org/10.5402/2011/281329
Research Article

Electron-Density and Electron-Lifetime Profile in Nanocrystalline-TiO𝟐 Electrode of Dye-Sensitized Solar Cells Analysed by Voltage Decay and Charge Extraction

1Laboratoire de Photonique et Interfaces, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
2Department of Electrical Engineering and Computer Sciences, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Hyogo, Himeji 671-2201, Japan

Received 6 May 2011; Accepted 28 June 2011

Academic Editors: C. S. Casari, B. R. Kimball, and A. Taubert

Copyright © 2011 Seigo Ito 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 dependence of the electron density and electron lifetime in nanocrystalline-TiO2 electrode on the electron back reaction with I3 in a dye-sensitized solar cell, based on a mesoporous titania (TiO2) matrix immersed in an iodine-based electrolyte, has been presented by analyzing the results of voltage decay and charge extraction measurements without modelling, without interpretation of mechanism, and without complicating calculations. This new analysis approach utilizes simple equations and basic definition of kinetics, concluding in absolute electron-density and charge-lifetime measurements. The relation of electron lifetime to open-circuit voltage indicates a peak of the long-lifetime charge at 5.5 V, which is consistent with the information of middle band suggested by Bisquert et al. (2004).