FLUORENE-CONTAINING DIFLUORO BENZOTRIAZOLYL COPOLYMER AND PREPARATION METHOD AND USE THEREOF

摘要

The present invention relates to the field of solar cells. Disclosed are a fluorene-containing difluoro benzotriazolyl copolymer and preparation method and use thereof; the copolymer has a structure as represented by formula (I), wherein both R 1 and R 2 are alkyls from C 1 to C 20 , and n is an integer from 10 to 100. In the fluorene-containing difluoro benzotriazolyl copolymer of the present invention, because the 1, 2, 3-benzotriazole copolymer contains two fluorine atoms, the HOMO energy level will be reduced by 0.11 eV while the fluorine-substituted 1, 2, 3-benzotriazole has two imido groups with strong electron -withdrawing property; the difluoro benzotriazole is a heterocyclic compound with strong electron-withdrawing property, and an alkyl chain can be easily introduced to the N-position of the N-H bond of the benzotriazole; the functional group of the alkyl chain can improve solar energy conversion efficiency, thus solving the low efficiency problem of polymer solar cells.