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2,1,3-Benzothiadiazole-containing donor–acceptor–acceptor dyes for dye-sensitized solar cells
- Lin, Li-Yen, Tsai, Chih-Hung, Lin, Francis, Huang, Tsung-Wei, Chou, Shu-Hua, Wu, Chung-Chih, Wong, Ken-Tsung
- Tetrahedron 2012 v.68 no.36 pp. 7509-7516
- chemical reactions, chemical structure, dyes, irradiation, organic compounds, photosensitizing agents, photovoltaic cells
- A series of organic dyes with a donor–acceptor–acceptor (D–A–A) configuration, in which various diarylthienylamine donors and a cyanoacrylic acid acceptor are bridged by a low-band-gap 2,1,3-benzothiadiazole acceptor, have been synthesized, characterized, and employed as photosensitizers for dye-sensitized solar cells (DSSCs). The adoption of 2,1,3-benzothiadiazole as the bridging acceptor endowed these tailor-made dyes with superior light-harvesting capabilities in comparison to their previously reported pyrimidine-based analogs. After fine-tuning the fabrication conditions, DSSCs based on these dyes showed solar spectral responses extending to the near-IR region and achieved power conversion efficiencies (PCEs) of up to 3.16% (OHexDPTB) under simulated AM 1.5G irradiation (100 mW cm⁻²).