28 February 2024 | Jiehao Fu, Qianguang Yang, Peihao Huang, Sein Chung, Kilwon Cho, Zhipeng Kan, Heng Liu, Xinhui Lu, Yongwen Lang, Hanjian Lai, Feng He, Patrick W. K. Fong, Shirong Lu, Yang Yang, Zeyun Xiao & Gang Li
The article presents a rational design and synthesis of a non-fullerene acceptor, o-BTP-eC9, which significantly enhances the performance of organic solar cells (OSCs). The design is guided by theoretical calculations, aiming to achieve multiple key requirements such as weak-absorption charge transfer state, high dielectric constant, suitable surface energy, and proper crystallinity. Compared to the benchmark BTP-eC9, o-BTP-eC9 exhibits an uplifted charge transfer state, reducing energy loss by 41 meV and achieving a power conversion efficiency (PCE) of 18.7%. The introduction of o-BTP-eC9 into a PM6:BTP-C9:o-BTP-eC9 ternary system further improves efficiency to 19.9% (19.5% certified), with enhanced operational stability. The study highlights the importance of optimizing molecular properties and morphology to improve OSC performance, paving the way for the development of more efficient organic solar cells.The article presents a rational design and synthesis of a non-fullerene acceptor, o-BTP-eC9, which significantly enhances the performance of organic solar cells (OSCs). The design is guided by theoretical calculations, aiming to achieve multiple key requirements such as weak-absorption charge transfer state, high dielectric constant, suitable surface energy, and proper crystallinity. Compared to the benchmark BTP-eC9, o-BTP-eC9 exhibits an uplifted charge transfer state, reducing energy loss by 41 meV and achieving a power conversion efficiency (PCE) of 18.7%. The introduction of o-BTP-eC9 into a PM6:BTP-C9:o-BTP-eC9 ternary system further improves efficiency to 19.9% (19.5% certified), with enhanced operational stability. The study highlights the importance of optimizing molecular properties and morphology to improve OSC performance, paving the way for the development of more efficient organic solar cells.