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International Journal of Photoenergy
Volume 2013 (2013), Article ID 834184, 7 pages
http://dx.doi.org/10.1155/2013/834184
Research Article

Synthesis and Characterization of a Gel-Type Electrolyte with Ionic Liquid Added for Dye-Sensitized Solar Cells

1Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei 10608, Taiwan
2Department of Industrial Design, National Taipei University of Technology, Taipei 10608, Taiwan
3Graduate Institute of Mechanical and Electrical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
4Department of Thoracic Surgery, Mackay Memorial Hospital, Taipei 10449, Taiwan
5Department of Civil Engineering, Texas A&M University, College Station, TX 77843-3136, USA

Received 23 November 2012; Accepted 24 December 2012

Academic Editor: Ho Chang

Copyright © 2013 Le-Yan Shi 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

This study intends to develop the electrolyte needed in dye-sensitized solar cells (DSSCs). Moreover, three different ionic liquids in different molalities are added to the gel-type electrolyte. Experimental results show that the DSSC composed of the gel-type electrolyte with no ionic liquid added can acquire 4.13% photoelectric conversion efficiency. However, the DSSC composed of the gel-type electrolyte with 0.4 M of 1-butyl-3-methylimidazolium chloride added has an open-circuit voltage of 810 mV, a short-circuit current density of 9.56 mA/cm2, and photoelectric conversion efficiency reaching 4.89%. Comparing this DSSC with the DSSC with no ionic liquid added, the photoelectric conversion efficiency can be enhanced by 18.4%. As to durability, the DSSC composed of the gel-type electrolyte with ionic liquid added still has a photoelectric conversion efficiency of 3.28% on the 7th day after it is stored in an enclosed space and maintains 0.72% efficiency on the 14th day. When the proposed DSSC is compared with the DSSC prepared by using a liquid-type electrolyte, the durability of its photoelectric conversion efficiency can be increased by 7 times.