1. Effects of the acceptors in triphenylamine-based D–A′–π–A dyes on photophysical, electrochemical, and photovoltaic properties.
- Author
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Wang, Ling, Shen, Ping, Cao, Zhencai, Liu, Xinping, Huang, Yuanshuai, Liu, Chunyan, Chen, Pan, Zhao, Bin, and Tan, Songting
- Subjects
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TRIPHENYLAMINE , *ELECTROCHEMISTRY , *PHOTOVOLTAIC power generation , *CHEMICAL structure , *MALONONITRILE , *ELECTROPHILES - Abstract
Abstract: Three D–A′–π–A structural triphenylamine dyes (Dye 1, Dye 2, and Dye 3) with cyanoacetic acid or malononitrile as an electron acceptor (A) and fluorenone or 9-(dicyanomethylene)fluorene as an additional acceptor (A′) have been designed and synthesized. Results revealed that both A and A′ have great influence on the optical, electrochemical and photovoltaic properties. In comparison with Dye 3, the photovoltaic performance of Dye 1 is remarkably improved by replacing 9-(dicyanomethylene)fluorene with fluorenone as the additional acceptor. The power conversion efficiency of dye-sensitized solar cell based on the Dye 1 (5.33%) is four times higher than that of Dye 3 (1.25%). The low efficiency of cell based on Dye 3 is mainly because the delocalization of the excited state is broken between the strong electron-withdrawing additional acceptor (9-(dicyanomethylene)fluorene) unit and cyanoacetic acid, which affects the efficient electron injection from Dye 3 to the conduction band of TiO2. [Copyright &y& Elsevier]
- Published
- 2014
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