Julolidine dyes with different acceptors and thiophene-conjugation bridge: Design, synthesis and their application in dye-sensitized solar cells

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• 作者：Guohua Wu ; Fantai Kong ; Jingzhe Li ; Wangchao Chen ; Changneng Zhang ; Qianqian Chen ; Xianxi Zhang ; Songyuan Dai
• 关键词：Dye-sensitized ; Solar cell ; Julolidine ; Transient absorption spectra ; Organic sensitizer ; Different acceptors
• 刊名：Synthetic Metals
• 出版年：2013
• 出版时间：15 September, 2013
• 年：2013
• 卷：180
• 期：Complete
• 页码：9-15
• 全文大小：1765 K

文摘

Four novel donor-¦Ð conjugated bridge-acceptor (D-¦Ð-A) metal-free organic dyes (J1, J2, J3 and J4) with a julolidine moiety as the electron donor for dye-sensitized solar cells (DSSCs) are synthesized. Their absorption spectra, electrochemical and photovoltaic properties were extensively investigated. Transient absorption spectra measurements show that insertion of one thiophene unit and replacing rhodanine-3-acetic acid by cyanoacetic acid can increase the dye regeneration process. Among these dyes, J3 gives the best photoelectric conversion efficiency of 1.52 % with J_sc = 7.53 mA cm^-2, V_oc = 353 mV, FF = 0.57. Compared with those of J1, the J_sc and the conversion efficiency of solar cell based on J3 are significantly increased by the insertion of a thiophene unit.