Morphological study of polymer/fullerene interfaces via benzene-PC70BM interaction

Donor-acceptor (D-A)-based random copolymers (PBDTT−PhC8TPD−TPD) were synthesized and investigate the miscibility of the copolymers with PC70BM through benzene-PC70BM interaction in polymer solar cells. Due to higher miscibility and nanoscale morphology of RP1 copolymer with PC70BM compared to P1, RP2, and RP3 copolymer, the power conversion efficiency (PCE) exceeding 4.9%.256