Fluorene functionalised sexithiophenes—utilising intramolecular charge transfer to extend the photocurrent spectrum in organic solar cells
作者:Peter J. Skabara、Rory Berridge、Igor M. Serebryakov、Alexander L. Kanibolotsky、Lyudmila Kanibolotskaya、Sergey Gordeyev、Igor F. Perepichka、N. Serdar Sariciftci、Christoph Winder
DOI:10.1039/b609858d
日期:——
A new series of oligothiophenes bearing electron deficient fluorene units have been prepared and characterised. The materials are functionalised by C8/C11 alkyl chains or triethylene glycol side groups, yet the higher oligomers remain poorly soluble. The absorption characteristics of a sexithiophene analogue (compound 3) have been studied by UV-vis and photoinduced absorption spectroscopy. Photovoltaic cells have been fabricated from blends of 3 and fullerene derivative [6,6]-phenyl-C61 butyric acid methyl ester (PCBM). The photocurrent spectrum of the device matches the absorption spectrum of the sexithiophene system which incorporates an intramolecular charge transfer band arising from the 1,3-dithiole-fluorene units. A modest power conversion efficiency of 0.1% was achieved.
我们制备了一系列带有缺电子芴单元的新型低聚噻吩,并对其进行了表征。这些材料通过 C8/C11 烷基链或三乙二醇侧基实现了官能化,但高级低聚物的溶解性仍然很差。通过紫外可见光谱和光诱导吸收光谱,研究了噻吩类似物(化合物 3)的吸收特性。利用 3 和富勒烯衍生物 [6,6]-phenyl-C61 丁酸甲酯(PCBM)的混合物制作了光伏电池。该装置的光电流光谱与sexithiophene 系统的吸收光谱相匹配,后者包含一个由 1,3-二硫代-芴单元产生的分子内电荷转移带。功率转换效率为 0.1%。