| 초록 |
New copolymer, P1 was synthesized and characterized. P1 consisted of alternating 2, 7-(9,9-dioctylfluorene) and (E)-2,3-bis(2’-thienyl)acrylonitrile. As introducing withdrawing groups in backbone chain, the energy levels, absorption spectra, and band gaps of the resulted polymers were effectively turned. P1 was blended with [60]PCBM. The highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) levels of P1 is well aligned with those of PCBM acceptor. Bulk heterojunction solar cells with these polymers as electron doner and (6, 6)-phenyl-C61-butyric acid methyl ester ([60]PCBM) as electron acceptor exhibits high Voc and power conversion efficiency (PCE). |
