Zhou Wen, Liu Jiabin, Xie Jiaping, You Shiyong, Deng Jiawei, Yu Fan, Jeong Sang Young, Woo Han Young, Wu Feiyan, Chen Lie
College of Chemistry and Engineering/Film Energy Chemistry for Jiangxi Provincial Key Laboratory (FEC), Nanchang University, Nanchang, 330031, PR China.
Department of Chemistry College of Science, Korea University 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea.
Angew Chem Int Ed Engl. 2025 Jan 15;64(3):e202415141. doi: 10.1002/anie.202415141. Epub 2024 Oct 31.
Organic solar cells (OSCs) based on giant molecular acceptors (GMAs) have attracted extensive attention due to their excellent power conversion efficiency (PCE) and operation stability. However, the large conjugated plane of GMAs poses great challenges in regulating the solubility, over-size aggregation and yield, which in turn further constrains their development in commercial products. Herein, we employ a non-fused skeleton strategy to develop novel non-fused star-shape trimers (3BTT6F and 3BTT6Cl) for improving device performance. Single-bond linkage can break the rigid planarity to form a 3D architecture, generating multidimensional charge transfer pathways. Importantly, the non-fused skeleton strategy can not only significantly improve solubility and synthesis yield, but also effectively suppress molecular excessive aggregation. Consequently, due to the optimized film-forming process and charge dynamics, 3BTT6F-based binary device obtains a high PCE of 17.52 %, which is significantly higher than the reported fully fused trimers. Excitingly, 3BTT6F-based ternary device even obtains a top-level PCE of 19.26 %. Furthermore, the non-fused star-shape configuration also endows these acceptors with enhanced intermolecular interaction in the active layer, demonstrating excellent operational stability. Our work emphasizes the potential of non-fused star-shape trimers, providing a new pathway for achieving highly efficient and stable OSCs.
基于巨型分子受体（GMA）的有机太阳能电池（OSC）因其优异的功率转换效率（PCE）和运行稳定性而受到广泛关注。然而，GMA的大共轭平面在调节溶解度、过大的聚集和产率方面带来了巨大挑战，这反过来又进一步限制了它们在商业产品中的发展。在此，我们采用非稠合骨架策略来开发新型非稠合星形三聚体（3BTT6F和3BTT6Cl）以提高器件性能。单键连接可以打破刚性平面性以形成三维结构，产生多维电荷转移途径。重要的是，非稠合骨架策略不仅可以显著提高溶解度和合成产率，还能有效抑制分子过度聚集。因此，由于优化的成膜过程和电荷动力学，基于3BTT6F的二元器件获得了17.52%的高PCE，这明显高于报道的全稠合三聚体。令人兴奋的是，基于3BTT6F的三元器件甚至获得了19.26%的顶级PCE。此外，非稠合星形结构还赋予这些受体在活性层中增强的分子间相互作用，展现出优异的运行稳定性。我们的工作强调了非稠合星形三聚体的潜力，为实现高效稳定的有机太阳能电池提供了一条新途径。
