Fluorine substitution enhanced photovoltaic performance of a D-A_1-D-A_2 copolymer

摘要

A new alternating donor-acceptor (D-A_1-D-A_2) copolymer containing two electron-deficient moieties, isoindigo and quinoxaline, was synthesized. The photovoltaic performance of this polymer could be improved by incorporating fluorine atoms into the quinoxaline units, resulting in an efficiency of 6.32％. This result highlights the attractive promise of D-A_1-D-A_2 copolymers for high-performance bulk heterojunction solar cells.