Alkyl substituted [6,6]-thienyl-C61-butyric acid methyl esters: easily accessible acceptor materials for bulk-heterojunction polymer solar cells
作者:Huiyu Zhao、Xiaoyang Guo、Hongkun Tian、Changyin Li、Zhiyuan Xie、Yanhou Geng、Fosong Wang
DOI:10.1039/b925089a
日期:——
[6,6]-Thienyl-C61-butyric acid ester derivatives with methyl, hexyl and 2-ethylhexyl at the 5-position of thiophene ring (TCBM-Cn, n represents the number of carbon atom in the alkyl chain) were synthesized. Unlike [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), these methanofullerene derivatives ([6,6] adduct) can be directly obtained from the typical diazo addition under mild conditions, and high temperature isomerization is unnecessary. With a hexyl or 2-ethylhexyl group at the 5-position of thiophene, the solubility of TCBM-Cn in chlorobenzene is as high as 180 ± 10 mg ml−1. Bulk heterojunction photovoltaic solar cells were fabricated with a device structure of ITO/poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS)/poly(3-hexylthiophene) (P3HT) : TCBM-Cn (1 : 0.8 w/w)/LiF/Al. The device based-on TCBM-C6 exhibited the best performance with a power conversion efficiency (PCE) of up to 4.26%.
合成了在噻吩环5位具有甲基、己基和2-乙基己基的[6,6]-噻吩基-C61-丁酸酯衍生物(TCBM-Cn,n表示烷基链中的碳原子数量)。与[6,6]-苯基-C61-丁酸甲酯(PCBM)不同,这些甲烷富勒烯衍生物([6,6]加成物)可以在温和条件下通过典型的二氮添加反应直接获得,无需高温异构化。在噻吩的5位带有己基或2-乙基己基时,TCBM-Cn在氯苯中的溶解度高达180 ± 10 mg ml−1。采用ITO/聚(3,4-乙撑二氧噻吩):聚(苯乙烯磺酸盐)(PEDOT:PSS)/聚(3-己基噻吩)(P3HT):TCBM-Cn(1:0.8 w/w)/LiF/Al的器件结构制造了散装异质结光伏太阳能电池。基于TCBM-C6的器件显示出最佳性能,功率转换效率(PCE)高达4.26%。