State Key Laboratory of Coordination Chemistry, MOE Key Laboratory of High-Performance Polymer Materials & Technology, School of Chemistry and Chemical Engineering, Nanjing University, 210023, Nanjing, Jiangsu, China.
Department of Chemistry, Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials, Energy Institute and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay, 999077, Kowloon, Hong Kong, China.
Nat Commun. 2023 Apr 22;14(1):2323. doi: 10.1038/s41467-023-37738-9.
Fullerene acceptors typically possess excellent electron-transporting properties and can work as guest components in ternary organic solar cells to enhance the charge extraction and efficiencies. However, conventional fullerene small molecules typically suffer from undesirable segregation and dimerization, thus limiting their applications in organic solar cells. Herein we report the use of a poly(fullerene-alt-xylene) acceptor (PFBO-C12) as guest component enables a significant efficiency increase from 16.9% for binary cells to 18.0% for ternary all-polymer solar cells. Ultrafast optic and optoelectronic studies unveil that PFBO-C12 can facilitate hole transfer and suppress charge recombination. Morphological investigations show that the ternary blends maintain a favorable morphology with high crystallinity and smaller domain size. Meanwhile, the introduction of PFBO-C12 reduces voltage loss and enables all-polymer solar cells with excellent light stability and mechanical durability in flexible devices. This work demonstrates that introducing polyfullerenes as guest components is an effective approach to achieving highly efficient ternary all-polymer solar cells with good stability and mechanical robustness.
富勒烯受体通常具有优异的电子传输性能，可作为三元有机太阳能电池的客体组分，以增强电荷提取和效率。然而，传统的富勒烯小分子通常存在不理想的分离和二聚化，从而限制了它们在有机太阳能电池中的应用。在此，我们报告了使用聚（富勒烯-alt-二甲苯）受体（PFBO-C12）作为客体组分，可使二元电池的效率从 16.9%显著提高到三元全聚合物太阳能电池的 18.0%。超快光学和光电研究揭示，PFBO-C12 可以促进空穴转移并抑制电荷复合。形貌研究表明，三元共混物保持了有利的形态，具有高结晶度和较小的畴尺寸。同时，引入 PFBO-C12 可降低电压损耗，并使全聚合物太阳能电池在柔性器件中具有出色的光稳定性和机械耐久性。这项工作表明，引入聚富勒烯作为客体组分是实现高效三元全聚合物太阳能电池的有效方法，具有良好的稳定性和机械鲁棒性。
