Effect of polyphenyl-substituted ethylene end-capped groups in metal-free organic dyes on performance of dye-sensitized solar cells

• DOI: 10.1039/c2ra20819a
• Publication Date: 2012-07-30T08:33:45Z
• Authors: Chengjian Chen; Jin-Yun Liao; Zhenguo Chi; Bingjia Xu; Xiqi Zhang; Dai-Bin Kuang; Yi Zhang; Siwei Liu; Jiarui Xu
• Keywords: Tetraphenylethylene; Moiety; Organic dye

A novel series of highly similar and comparable metal-free organic dyes have been designed synthesized for dye-sensitized solar cells (DSSCs). The end-capped groups, namely, diphenylethylene, triphenylethylene, tetraphenylethylene, significant effects on the performance DSSCs. DSSC based a triphenylethylene dye exhibits highest power conversion efficiency (η) 6.29%, whereas that tetraphenylethylene has open-circuit photovoltage (Voc) 804 mV. Voc DSSCs can be greatly improved upon incorporation twisted non-planar aggregation-induced emission (AIE) moiety in molecular structure dyes. group with moderately is found to suitable improvement efficiency. exhibit an aggregation-caused quenching effect, i.e., do not emit light after being adsorbed TiO2 films, although they contain moieties.