C70-based Aqueous-Soluble Fullerene Acceptor for Eco-Friendly Polymer Solar Cells with Water Composition-Tolerant Performance
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초록
내용
Eco-PSCs based on aqueous-soluble conjugated materials have recently received great attention. In this work, the development of an aqueous-processable C70-based fullerene (PC71BO15) is reported. The PCEs of PC71BO15-based eco-PSCs up to 2.51%, which is the highest value for aqueous-processed PSCs, was achieved. At the optimized condition, the PCE of the PC71BO15-based eco-PSCs is 73% higher than that of the PC61BO15-based counterparts, as a result of enhanced light absorption. More importantly, the PC71BO15-based eco-PSCs show much greater tolerance in their PCEs to the solvent composition. PC71BO15-based eco-PSCs at a 30% water ratio maintain 89% of the optimal performance at a 15% water ratio. Different aggregation behaviors induced large difference in terms of water-tolerant behavior, which is carefully explored by electrical, optical and morphological characterizations. The PC71BO15-based eco-PSCs is able to have excellent reproducibility due to the high water content-tolerance.