Regulating the Packing of Non-Fullerene Acceptors via Multiple Noncovalent Interactions for Enhancing the Performance of Organic Solar Cells

作者：Shiyu Feng, Miao Li, Ningning Tang, Xiaodong Wang, Hao Huang, Guangliu Ran, Yahui Liu, Zengqi Xie, Wenkai Zhang, Zhishan Bo · 发表于：ACS Applied Materials & Interfaces · 年份：2020 · DOI：10.1021/acsami.9b18076 · 被引用次数：109 · 研究领域：Organic Electronics and Photovoltaics、Conducting polymers and applications、Semiconductor materials and interfaces

Three noncovalently fused-ring electron acceptors ( FOC6-IC, FOC6-FIC, and FOC2C6-2FIC ) are synthesized. Single crystals of FOC6-IC and FOC2C6-2FIC are prepared, and structure analyses reveal that the molecular backbone can be planarized via the formation of the intramolecular noncovalent interactions. These acceptor molecules can be packed closely in the solid state via π–π stacking and static interactions between the central phenylene unit and the terminal group with a distance of 3.3–3.4 Å. Besides, multiple intermolecular noncovalent interactions can be observed in the single crystal structure of the fluorinated acceptor FOC2C6-2FIC, which help increase the crystallinity of acceptors and the charge mobility of the blends. Photovoltaic devices based on FOC2C6-2FIC give a power conversion efficiency of 12.36%, higher than 12.08% for FOC6-FIC and 10.80% for FOC6-IC .