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21 September 2011 Fine tuning the structure of unsymmetrical squaraine dyes towards the development of efficient dye-sensitized solar cells
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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.
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Shyam S. Pandey, Rie Watanabe, Naotaka Fujikawa, Yuhei Ogomi, Yoshihiro Yamaguchi, and Shuzi Hayase "Fine tuning the structure of unsymmetrical squaraine dyes towards the development of efficient dye-sensitized solar cells", Proc. SPIE 8111, Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion II, 811116 (21 September 2011); https://doi.org/10.1117/12.893354
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