Syntheses of PCDTBT containing tetrafluorobenzene as electron-withdrawing group with deep HOMO energy level and applications for photovoltaics

摘要

Conjugated polymers using tetrafluorophenylene unit were synthesized and deployed for photovoltaics. The tetrafluorophenylene unit which has the strong electron-withdrawing ability, was utilized for the copolymers of push-pull type with low bandgaps for organic solar cells. 9H-Carbazole as electron-rich unit and di-2-thienyl-2,1,3-benzothiadiazole (DTBT) or tetrafluorophenylene unit as electron-deficient unit were utilized for the syntheses of donor-acceptor (D-A) types of conjugated polymers with different ratios of tetrafluorophenylene unit (PCDTBTF-1, PCDTBTF-3 and PCDTBTF-10).