Novel Carboxylated Oligothiophenes as Sensitizers in Photoelectric Conversion Systems
作者:Shuxin Tan、Jin Zhai、Hongjun Fang、Tonggang Jiu、Jun Ge、Yuliang Li、Lei Jiang、Daoben Zhu
DOI:10.1002/chem.200500425
日期:2005.10.21
photo-to-current conversion efficiency (IPCE) has a maximum as high as 80 %. In addition, photovoltage and photocurrent transients show that slow charge recombination in DSSCs is important for efficient charge separation and excellent photoelectric conversion properties of the oligomers. These initial and promising results suggest that carboxylated oligothiophenes are efficient photosensitizers.
设计并合成了具有不同噻吩单元的新型羧基化寡聚噻吩,并在染料敏化太阳能电池(DSSC)中合成了光敏剂,以用作高效光电材料。通过在噻吩分子中引入有效的共价键,可将-COOH引入噻吩分子中,从而导致UV-可见光吸收发生红移,提高光收集效率,并增强光诱导的电荷传输。噻吩单元数目的增加也实现了寡噻吩吸收光谱的红移。基于低聚物的DSSC具有优异的光伏性能。当使用五噻吩二羧酸二羧酸作为敏化剂时,在100 mW cm(-2)的辐射下,短路电流为10.57 mA cm(-2),总能量转换效率为3.36%。入射光电流转换效率(IPCE)最高可达80%。此外,光电压和光电流瞬变表明,DSSC中缓慢的电荷复合对于低聚物的有效电荷分离和出色的光电转换性能很重要。这些初步的和有希望的结果表明,羧基化的低聚噻吩是有效的光敏剂。