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Photovoltaic properties of three new cyanine dyes for dye-sensitized solar cells

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Abstract

Three carboxylated cyanine dyes, 2-[(1-butyl-3,3-dimethyl-5-carboxylindoline-2-ylidene)propenyl]-[1-butyl-3,3-dimethyl-7-(1-ethyl-1 H-1,2,3-triazole-4-yl]-1 H-benz[e]indolium iodide (Cy1), 2-[(1-butyl-3,3-dimethyl-5-carboxyl-indoline-2-ylidene)propenyl]-{1-butyl-3,3-dimethyl-7-[(4-piperidine- N-ethyl-1,8-naphthalimide)-1 H-1,2,3-triazole-4-yl]}-1 H-benz[e]indolium iodide (Cy2) and 2-[(1-butyl-3,3-dimethyl-5-carboxyl-indoline-2-ylidene)propenyl)-[1-butyl-3,3-dimethyl-7-{(4-piperidine- N-butyl-1,8-naphthalimide)-1 H-1,2,3-triazole-4-yl}]-1 H-benz[e]indolium iodide (Cy3), have been synthesized and characterized with regard to their structures and electrochemical properties. Upon adsorption onto a TiO2 electrode, the absorption spectra of the three cyanine dyes are all broadened to both red and blue sides compared with their respective spectra in an acetonitrile and ethanol mixture. Cy2 and Cy3, containing a naphthalimide group, have stronger absorption intensities and broader absorption spectra than Cy1, which consequently leads to better light-to-electricity conversion properties. Among the three cyanine dyes, Cy3 generated the highest photoelectric conversion yield of 4.80% (Jsc = 14.5 mA cm-2, Voc = 500 mV, FF = 0.49) under illumination with 75 mW cm-2 white light from a Xe lamp.

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Authors and Affiliations

  1. Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, Shanghai, 200237, China

    Wenjun Wu, Jianli Hua, Yinghua Jin, Wenhai Zhan & He Tian

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  1. Wenjun Wu
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  2. Jianli Hua
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  3. Yinghua Jin
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  4. Wenhai Zhan
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  5. He Tian
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Correspondence to He Tian.

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Wu, W., Hua, J., Jin, Y. et al. Photovoltaic properties of three new cyanine dyes for dye-sensitized solar cells. Photochem Photobiol Sci 7, 63–68 (2008). https://doi.org/10.1039/b712439b

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