Proceedings of NFA-Based Organic Solar Cells: Materials, Morphology and Fundamentals (NFASC)
DOI: https://doi.org/10.29363/nanoge.nfasc.2021.016
Publication date: 25th January 2021
Non-fullerene electron acceptors have attracted enormous attention due to their advantages of chemical and energy level tunabilities, morphological stability, and low cost over their fullerene derivative counterparts. So far, numerous non-fullerene electron acceptors have been designed and synthesized with outstanding performances recently. Among them, fused-ring electron acceptors are the most famous ones with good structural planarity and rigidity, which successfully boost the power conversion efficiencies (PCEs) of organic solar cells (OSCs) over 18%. For the potential application in the future, it is important to design novel structure which is easy and cheap to synthesize but can still maintain the advantages of fused-ring electron acceptors. In this presentation, I will introduce new design strategy to access novel small molecule electron acceptors with unfused-ring cores for low cost and high performance OSC applications. Molecular engineering on fused-ring electron acceptors for high performance OSCs will be presented. The fullerene-free acceptor alloy strategy for ternary solar cells will also be introduced. Efficiency over 18% is realized in the ternary OSCs by carefully controlling the active morphology.
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