Dye-sensitized solar cells based on functionalized truxene structure |
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| Authors: | Fei Wu Jian-Lin Liu Lawrence Tien Lin Lee Tao Chen Min Wang Lin-Na Zhu |
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| Institution: | a Faculty of Materials and Energy, Southwest University, Chongqing 400715, China;
b Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China |
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| Abstract: | Three new metal-free organic dyes (TX1, TX2 and TX3) based on truxene core structure, with triphenylamine as the electron donor, thiophene as the p spacers, and cyanoacetic acid or rhodanine-3-acetic acid as the electron acceptor are designed and synthesized. Their UV-vis absorption spectra, electrochemical and photovoltaic properties were investigated. The cyanoacrylic acid is verified to be a better acceptor unit (meanwhile the anchoring group) compared to the rhodanine-3-acetic acid. And also, two anchoring groups in TX2 could provide stronger adsorption ability on the TiO2 surface. In addition, the EIS results indicate a slower charge recombination processes for TX2. As a result, dye TX2 bearing two cyanoacetic acid outperforms the other two dyes, exhibiting the photo-conversion efficiency of 2.64%, with Jsc = 5.09 mA cm-2, Voc = 729 mV, FF = 71.1. |
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| Keywords: | Truxene Dye-sensitized solar cell Sensitizer Photovoltaic properties |
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