| 초록 |
This study synthesized a novel polymer, poly[alkylidene fluorene-alt- diphenylquinoxaline] (PAFDQ), based on a planar alkylidene-fluorene and a highly soluble quinoxaline derivative through the Suzuki coupling reaction. We design novel molecular structure based on alkylidene fluorene and quinoxaline derivatives due to compact packing property by planar structure of alkyidene fluorene and efficient intra-molecular charge transfer by quinoxaline derivative. PAFDQ showed higher thermal stability compared with the general fluorene structure owing to its rigid alkylidene-fluorene structure. The device based on PAFDQ/Y6-BO-4Cl showed the best performance in terms of short circuit current (9.86 mA/cm2), open circuit voltage (0.76 V), fill factor (44.23 %), and power conversion efficiency (3.32 %). Moreover, in the PAFDQ/Y6-BO-4Cl-based film, the phase separation of donor-rich and acceptor-rich phases, and the connected dark domains, was observed. |
