Recent progress on non-fullerene acceptor materials for organic solar cells

Recently, with the response to national environmental protection initiatives, the development of clean energy has become a hot topic. Organic solar cells, as an emerging clean energy technology, have received widespread favor from researchers due to their advantages such as flexibility, light weight, solution processability, and easy regulation, and have made breakthrough progress. Non-fullerene acceptor materials, as a key component of organic solar cells, have attracted widespread attention in recent years. At present, the power conversion efficiency of organic solar cells based on Y-series fused-ring non-fullerene acceptor materials has exceeded 20 %. According to different structural types of non-fullerene acceptor molecules, this article reviews the research progress of non-fullerene acceptor molecules and their photoelectric properties in recent years from various aspects such as core skeleton engineering, side chain engineering, and end group modification, and prospects the future research directions and application prospects of non-fullerene acceptors.