Synthesis and photovoltaic property of new kind of organic dyes containing 2,2鈥?bithiophene unit with three electron-donors
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- 作者：Tainan Duan ; Ke Fan ; Cheng Zhong ; Wuwei Gao ; Xingguo Chen ; Tianyou Peng ; Jingui Qin
- 关键词：Organic dye ; Dye-sensitized solar cell ; Bithiophene linker ; Photovoltaic property
- 刊名：Journal of Photochemistry and Photobiology A: Chemistry
- 出版年：15 March, 2014
- 年：2014
- 卷：278
- 期：Complete
- 页码：39-45
- 全文大小：1588 K
文摘
A series of new organic dyes containing 2,2鈥?bithiophene unit as a 蟺-linker to connect three electron-donors (including carbazole, DH-45; phenothiazine, DH-46; triphenylamine, DH-47) at 3,4鈥?5鈥?positions have been designed and synthesized for dye-sensitized solar cells. The experimental results and theoretic calculations indicated that the large steric hindrance among three electron-donors and 2,2鈥?bithiophene ring partially destroys the whole molecular coplanarity and weakens intramolecular charge transfer (ICT), which results in the narrow, blue-shift of absorption band and decrease of short-circuit current (Jsc). However, the twisted conjugation skeleton for the dyes is favorable for the spatial charge separation that enhances the open-circuit voltage (Voc). Among them, the dye containing carbazole donating group (DH-45) shows best optimized structure for intramolecular charge transfer (ICT) and exhibits better photovoltaic performances than that of the other two dyes (DH-46 and DH-47).