| 초록 |
Current organic electronics are dominantly fabricated with highly toxic halogenated organic solvents. Here, desirable aqueous processing of oligoethylene glycol (OEG) side chain-based organic semiconductors is developed for eco-friendly fabrication of polymer solar cells (eco-PSCs). Water:ethanol co-solvent system was found to enable the solubility enhancement of the highly crystalline conjugated polymer (PPDT2FBT-A) and fullerene mono-adduct (PC61BO12) compared with pure ethanol system as a reference. For a systematic study, we varied the composition ratio of water in ethanol from 0% to 100%, and investigated its influence on solution behaviors, thin-film formation, morphologies, and device characteristics. By optimizing the ratio of the two solvents, the record-breaking eco-PSCs performance of 2.03% was achieved. Importantly, this aqueous processing is demonstrated to be widely applicable to various OEG-based conjugated materials, implying optimistic future of eco-PSCs. |
