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New Organic Dyes Based on Biarylmethylene-bridged triphenylamine for Dye Sensitized Solar Cell

Chinese Journal of Chemistry 2015年第8期33卷 925-933页

作者： Fei Wu Haitao Liu Lawrence Tien Lin Lee Tao Chen Min Wang Linna Zhu Faculty of Materials and Energy Southwest University Chongqing 400715 China Department of Physics The Chinese University ofHong Kong Shatin New Territories Hong Kong China

Three new organic dyes were synthesized and characterized for applications in dye-sensitized solar cells （DSSCs）. In these dyes, diarylmethylene-bridged triphenylarnine is the donor, and different acceptors and vinyl- thiophene are designed to get TBA-1, TBA-2 and TBA-3. Their photophysical, electrochemical and photovoltaic properties were investigated, and the effects of the acceptor structures as well as the linkage on these properties were evaluated. Results demonstrated that the vinylthiophene linkage between the donor and the acceptor is favor- able for improving light harvesting ability of TBA-2. In addition, the electrochemical impedance spectroscopy ex- periments suggest larger Rrec and longer electron lifetime of TBA-2. Therefore, it outperforms the other dyes, exhib- iting the highest power conversion efficiency of 3.87%, with Jsc of 8.25 mAocm-2 and Voc of 666 mV. Unfortunately, the TBA-3 with three acceptor groups only shows efficiency of 3.52%, indicating that the design of increasing ac- ceptor groups plays little role on enhancing the solar cell efficiency.

关键词： diarylmethylene-bridged triphenylamine dye-sensitized solar cells acceptor rhodanine-3-acetic acid

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