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Proceedings Paper

Fine tuning the structure of unsymmetrical squaraine dyes towards the development of efficient dye-sensitized solar cells
Author(s): Shyam S. Pandey; Rie Watanabe; Naotaka Fujikawa; Yuhei Ogomi; Yoshihiro Yamaguchi; Shuzi Hayase
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Paper Abstract

Creation of molecular asymmetry in the organic sensitizing dyes has been demonstrated for enhancing the photoconversion efficiency due to unidirectional flow of electron after the photoexcitation. Molecular structures for direct indole ring carboxy-functionalized unsymmetrical squaraine dyes have been optimized by fine tuning the molecular structures and judicious selection of the substituents to prevent the dye aggregation and electron recombination. Best efficiency of 4.42 % was achieved for unsymmetrical squaraine dye SQ-64 with a short circuit current density of 11.22 mA/cm2, a fill factor of 0.61 and an open circuit voltage of 0.64 V under standard AM 1.5 simulated solar irradiation.

Paper Details

Date Published: 21 September 2011
PDF: 10 pages
Proc. SPIE 8111, Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion II, 811116 (21 September 2011); doi: 10.1117/12.893354
Show Author Affiliations
Shyam S. Pandey, Kyushu Institute of Technology (Japan)
Rie Watanabe, Kyushu Institute of Technology (Japan)
Naotaka Fujikawa, Kyushu Institute of Technology (Japan)
Yuhei Ogomi, Kyushu Institute of Technology (Japan)
Yoshihiro Yamaguchi, Nippon Steel Chemical Co., Ltd. (Japan)
Shuzi Hayase, Kyushu Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 8111:
Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion II
Loucas Tsakalakos, Editor(s)

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