Asymmetric 9,9′-bifluorenylidene-based small molecules as the non-fullerene acceptors for organic photovoltaic cells
作者:Tong Zhang、Tianzhi Yu、Yuling Zhao、Chengjin Wei、Hailin Ma、Yanmei Li、Hui Zhang
DOI:10.1016/j.dyepig.2020.108233
日期:2020.6
electron acceptors for organic photovoltaic cells. By changing the electron-withdrawing ability of the terminal group, the molecular energy level and band gap can be easily adjusted. The optical bandgaps of the three compounds in the thin films decreased with increasing the electron-withdrawing ability of the terminal group. Besides, the lateral chains of alkoxy groups located at the asymmetric end also
三个新的不对称的基于9,9'-联芴基的衍生物2,7-二丁氧基-3',6'-双(5-亚甲基丙二腈-3-辛基噻吩-2-基)-9,9'-联芴基(BF-TDCN 2),2,7-二丁氧基-3',6'-双(5-(亚甲基茚-1,3-二酮)-3-辛基噻吩-2-基)-9,9'-联芴基(BF-TID 2)和2,7-二丁氧基-3',6'-双(5-(2-亚甲基-3-氧代-2,3-二氢-1H-茚满-1-亚烷基)丙二腈)-3-辛基噻吩-2接枝不同的吸电子基团(丙二腈(DCN),1H-茚-1,3(2H)-二酮(ID)和2)成功合成了-yl)-9,9'-联芴基(BF-TDCI 2)-(3-氧代-2,3-二氢-1H-茚-1-基)丙二腈(DCI)),用作有机光伏电池的电子受体。通过改变端基的吸电子能力,可以容易地调节分子能级和带隙。薄膜中三种化合物的光学带隙随着端基吸电子能力的提高而降低。此外,位于不对称末端的烷氧基的侧链也