New Medium-Bandgap Nonfused Ring Guest Acceptor with a Higher-Lying LUMO Level Enables High-Performance Ternary Organic Solar Cells

• DOI: 10.1021/acsami.3c06529
• Publication Date: 2023-08-31T13:37:27Z
• Authors: Zhongxin Zhou; Yongchuan Xu; Jun Yang; Shiyue Zhang; Shujing Jin; Hongxiang Li; WeiGuo Zhu; Yu Liu
• Keywords: HOMO/LUMO; Acceptor

Adding another constituent into a binary system, known as ternary strategy, represents simple and effective approach to boosting the power conversion efficiency (PCE) of organic solar cells (OSCs). Herein, we have prepared new nonfused ring small-molecule acceptor with medium bandgap, named DFTQA-2FIC, which possesses high-lying lowest unoccupied molecular orbital energy level strong intramolecular charge-transfer effect. We elaborately utilized it third component in typical PM6:Y6 blend obtain high-performance OSCs. The resulting film exhibited superior balanced hole/electron mobility, enhanced favorable aggregation morphology, reduced charge carrier recombination. Consequently, an optimized OSC presented distinctly increased PCE 17.29%, accompanied by synchronous enhancements crucial parameters, representing 7.46% improvement over based on 16.09%. This study highlights that incorporating DFTQA-2FIC system is suitable for optimizing photovoltaic performance.