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International Journal of Photoenergy
Volume 2011 (2011), Article ID 410352, 7 pages
http://dx.doi.org/10.1155/2011/410352
Research Article

Influence of Parameters of Cold Isostatic Pressing on TiO2 Films for Flexible Dye-Sensitized Solar Cells

1Department of Materials Engineering, Monash University, Clayton, Melbourne, VIC 3800, Australia
2Department of Mechanical and Aerospace Engineering, Monash University, Clayton, Melbourne, VIC 3800, Australia

Received 22 February 2011; Accepted 9 May 2011

Academic Editor: Leonardo Palmisano

Copyright © 2011 Yong Peng 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

Cold Isostatic Pressing (CIP) is used to make TiO2 working electrodes for flexible dye-sensitized solar cells (DSCs). Different CIP processes, varying pressures from 50 MPa to 200 MPa and holding time 1 s up to 600 s, are performed to study the effect of CIP on the resistivity of TiO2 electrode thin films and the power conversion efficiency (PCE) of DSCs. The results show that the CIP process has significantly improved the PCE of DSC devices. Electrochemical impedance spectroscopy (EIS) analysis indicates a clear correlation between the PCE enhancement and the resistivity reduction in TiO2 thin films after various CIP processes. Porosity reduction and localized joints formed between some TiO2 nanoparticles due to the friction heat in the CIP process are believed to be responsible for the resistivity reduction of the TiO2 working electrode thin films.