| 초록 |
Organic solar cells (OSCs) have attracted significant interest due to lightweight, flexibility and large-area fabrication. However, most of reported terpolymers were processed in halogenated solvents such as chlorobenzene (CB) which can cause difficulties due to their toxicity, and cost. Therefore, we synthesized a new series of fluorinated benzothiadiazole (FBT)-based terpolymers comprising two donating units, quaterthiophene (QT, D1) and benzo[1,2-b:4,5-b]dithiophene (BDT, D2) with good solubility in non-halogenated solvent. Furthermore, we introduced two and/or four fluorine atoms on bithiophene segment and called them PfBT4T-BDT, PfBT4T2F-BDT and PfBT4T4F-BDT, respectively. The bulk-heterojunction OSC device based on PfBT4T4F-BDT and diphenylether (DPE) additive processed from o-xylene solvent showed a high power conversion efficiency (PCE) of 8.45%, while the OSC devices based on PfBT4T-BDT, PfBT4T2F-BDT with DPE exhibited PCE of 6.15% and 7.54%, respectively. |
