Chen Zhenyu, Ge Jinfeng, Song Wei, Tong Xinyu, Liu Hui, Yu Xueliang, Li Jing, Shi Jingyu, Xie Lin, Han Chengcheng, Liu Quan, Ge Ziyi
Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, 315201, China.
Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Adv Mater. 2024 Aug;36(33):e2406690. doi: 10.1002/adma.202406690. Epub 2024 Jun 27.
Organic solar cells, as a cutting-edge sustainable renewable energy technology, possess a myriad of potential applications, while the bottleneck problem of less than 20% efficiency limits the further development. Simultaneously achieving an ordered molecular arrangement, appropriate crystalline domain size, and reduced nonradiative recombination poses a significant challenge and is pivotal for overcoming efficiency limitations. This study employs a dual strategy involving the development of a novel acceptor and ternary blending to address this challenge. A novel non-fullerene acceptor, SMA, characterized by a highly ordered arrangement and high lowest unoccupied molecular orbital energy level, is synthesized. By incorporating SMA as a guest acceptor in the PM6:BTP-eC9 system, it is observed that SMA staggered the liquid-solid transition of donor and acceptor, facilitating acceptor crystallization and ordering while maintaining a suitable domain size. Furthermore, SMA optimized the vertical morphology and reduced bimolecular recombination. As a result, the ternary device achieved a champion efficiency of 20.22%, accompanied by increased voltage, short-circuit current density, and fill factor. Notably, a stabilized efficiency of 18.42% is attained for flexible devices. This study underscores the significant potential of a synergistic approach integrating acceptor material innovation and ternary blending techniques for optimizing bulk heterojunction morphology and photovoltaic performance.
有机太阳能电池作为一种前沿的可持续可再生能源技术，具有众多潜在应用，然而效率低于20%这一瓶颈问题限制了其进一步发展。同时实现有序的分子排列、合适的结晶域尺寸以及减少非辐射复合是一项重大挑战，对于克服效率限制至关重要。本研究采用了一种双重策略，包括开发新型受体和三元共混来应对这一挑战。合成了一种新型非富勒烯受体SMA，其具有高度有序的排列和较高的最低未占据分子轨道能级。通过在PM6:BTP-eC9体系中引入SMA作为客体受体，观察到SMA使供体和受体的液-固转变错开，促进了受体结晶和有序排列，同时保持了合适的域尺寸。此外，SMA优化了垂直形态并减少了双分子复合。结果，三元器件实现了20.22%的最高效率，同时电压、短路电流密度和填充因子均有所提高。值得注意的是，柔性器件实现了18.42%的稳定效率。本研究强调了将受体材料创新和三元共混技术相结合的协同方法在优化体异质结形态和光伏性能方面的巨大潜力。
