Metal-free organic dyes derived from triphenylethylene for dye-sensitized solar cells: tuning of the performance by phenothiazine and carbazole
作者:Chengjian Chen、Jin-Yun Liao、Zhenguo Chi、Bingjia Xu、Xiqi Zhang、Dai-Bin Kuang、Yi Zhang、Siwei Liu、Jiarui Xu
DOI:10.1039/c2jm30254c
日期:——
Four novel D–D–π–A configuration metal-free organic dyes (C3, P2, C2 and P3) with triphenylethylene phenothiazine moieties or triphenylethylene carbazole moieties as additional electron donors for dye-sensitized solar cells (DSSCs) have been synthesized. The cells based on C3, P2, C2 and P3 dyes with efficiencies of 2.14%, 2.69%, 5.51% and 6.55%, respectively, are obtained. The P3 based cell exhibits the highest efficiency of 6.55% accompanied by a short-circuit current density (Jsc) of 12.18 mA cm−2, a rather high open-circuit photovoltage (Voc) of 826 mV, and a fill factor (ff) of 0.65, performances which are remarkable in the DSSCs based on metal-free organic dyes. The twisted non-planar configuration in P3 decelerates the charge recombination in the charge-separated state and hence contributes to the improvement of the performance of DSSCs.
合成了四种新型的D–D–π–A结构无金属有机染料(C3、P2、C2和P3),它们分别以三苯乙烯酚噻嗪基团或三苯乙烯咔唑基团作为附加电子供体,用于染料敏化太阳能电池(DSSCs)。基于C3、P2、C2和P3染料的电池效率分别为2.14%、2.69%、5.51%和6.55%。基于P3的电池表现出最高的效率为6.55%,伴随有12.18 mA cm−2的短路电流密度(Jsc)、826 mV的相当高的开路光电压(Voc)以及0.65的填充因子(ff),这些性能在基于无金属有机染料的DSSCs中是非常显著的。P3中的扭曲非平面结构减缓了电荷分离状态下的电荷复合,从而有助于提高DSSCs的性能。