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International Journal of Photoenergy
Volume 2011, Article ID 234931, 7 pages
Research Article

Influence of Titania Dispersivity on the Conversion Efficiency of Dye-Sensitized Solar Cells

1Mikuni Color Ltd., 101 Kokubunji, Mikunino-cho, Himeji, Hyogo 671-0234, Japan
2Graduate School of Environmental Studies, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
3Department of Electrical Engineering and Computer Sciences, Graduate School of Engineering, University of Hyogo, 2167 Shosya, Himeji, Hyogo 671-2280, Japan

Received 11 July 2011; Accepted 25 September 2011

Academic Editor: Roel van De Krol

Copyright © 2011 Yasuhiro Yamamoto 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.


Titania powder (P25) was dispersed by bead-milling breakdown method, and the dispersivity of TiO2 was controlled by adjusting the mean secondary TiO2 particle size to 45, 56, and 75 nm by changing the dispersion solvent blend ratio of ethanol and terpineol. The transparency of the coated layer increased when the particle size of TiO2 aggregates became smaller than 100 nm. Although the transparency was significantly different according to differences in the size of nanocrystallyne-TiO2 aggregates, the resulting photovoltaic (PV) effect of a dye-sensitized solar cell (DSSC) was not significantly different between the different aggregate sizes. A double layer structure (transparent TiO2 layer/opaque TiO2 layer) was adopted to improve the PV effect, which resulted in an improvement of the photocurrent and conversion efficiency of 13.2% and 11.1%, respectively, from that for the DSSCs with single-layered TiO2 electrodes.