Design of Fullerene-Free Electron-Acceptor Materials Containing Perylenediimide Units for Solution-Processed Organic Electronic Devices
作者:Koutarou Aoyagi、Yu Shoji、Saika Otsubo、Susumu Kawauchi、Mitsuru Ueda、Hidetoshi Matsumoto、Tomoya Higashihara
DOI:10.1246/bcsj.20140167
日期:2014.10.15
Organic electron-accepting materials with light absorbance and wide absorption bands are sorely needed as alternatives to fullerene derivatives for organic electronics, in particular for organic photovoltaic (OPV) applications. In the present study, we have designed and synthesized a series of novel donor–acceptor–donor (D–A–D) electron-accepting molecules based on perylenediimide (PDI) and oligothiophene units, that is, PDI-alkoxy, PDI-Th, PDI-BiTh, and PDI-TerTh. The optical and electrochemical properties of the obtained PDI derivatives and performances of organic field-effect transistor (OFET) and OPV devices based on PDI derivatives were investigated. The PDI derivatives showed a higher light absorption intensity and wider absorption region than those of [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM). The highest electron mobility (2.33 × 10−4 cm2 V−1 s−1) was shown using an OFET device based on PDI-BiTh, and the highest power conversion efficiency (PCE) of 5.2 × 10−2% was given by the OPV device based on the PDI-BiTh acceptor. The device performances demonstrated that PDI derivatives with a D–A–D architecture are potentially useful for solution-processed organic electronics.
有机电子学,特别是有机光伏(OPV)应用中,迫切需要具有光吸收和宽带吸收的有机电子接受材料作为富勒烯衍生物的替代品。在本研究中,我们设计并合成了一系列基于芘二酰亚胺(PDI)和寡聚噻吩单元的新型供体-受体-供体(D-A-D)电子接受分子,即PDI-烷氧基、PDI-噻吩、PDI-双噻吩和PDI-三噻吩。研究了所得PDI衍生物的光学和电化学性质,以及基于PDI衍生物的有机场效应晶体管(OFET)和OPV器件的性能。PDI衍生物的吸光强度和吸收区域比[6,6]-苯基-C61-丁酸甲酯(PC61BM)更广泛。基于PDI-双噻吩的OFET器件显示出最高的电子迁移率(2.33 × 10^-4 cm^2 V^-1 s^-1),而基于PDI-双噻吩受体的OPV器件显示出最高的功率转换效率(PCE)为5.2 × 10^-2%。器件性能表明,具有D-A-D结构的PDI衍生物在溶液法制备的有机电子学中具有潜在应用价值。