FLUORENE-CONTAINING DIFLUORO BENZOTRIAZOLYL COPOLYMER AND PREPARATION METHOD AND USE THEREOF
申请人:Zhou Mingjie
公开号:US20140163166A1
公开(公告)日:2014-06-12
The present invention relates to 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.