Jia Tao, Lin Tao, Yang Yang, Wu Lunbi, Cai Huimin, Zhang Zesheng, Lin Kangfeng, Hai Yulong, Luo Yongmin, Ma Ruijie, Li Yao, Dela Peña Top Archie, Liu Sha, Zhang Jie, Liu Chunchen, Chen Junwu, Wu Jiaying, Liu Shengjian, Huang Fei
School of Optoelectronic Engineering, Guangdong Polytechnic Normal University, Guangzhou, China.
School of Chemistry, Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, Key Laboratory of Electronic Chemicals for Integrated Circuit Packaging, South China Normal University (SCNU), Guangzhou, China.
Nat Commun. 2025 Jan 20;16(1):871. doi: 10.1038/s41467-025-56225-x.
To achieve the commercialization of organic solar cells (OSCs), it is crucial not only to enhance power conversion efficiency (PCE) but also to improve device stability through rational molecular design. Recently emerging giant molecular acceptor (GMA) materials offer various advantages, such as precise chemical structure, high molecular weight (beneficial to film stability under several external stress), and impressive device efficiency, making them a promising candidate. Here, we report a dendritic hexamer acceptor developed through a branch-connecting strategy, which overcomes the molecular weight bottleneck of GMAs and achieves a high production yield over 58%. The dendritic acceptor Six-IC exhibits modulated crystallinity and miscibility with the donor, thus better morphology performance compared to its monomer, DTC8. Its charge transport ability is further enhanced by additional channels between the armed units. Consequently, the binary OSCs based on D18:Six-IC achieves a cutting-edge efficiency of 19.4% for high-molecular weight acceptor based systems, as well as decent device stability and film ductility. This work reports high-performance OSCs based on dendritic molecule acceptor with a molecular weight exceeding 10000 g/mol and shares the understanding for designing comprehensively high-performing acceptor materials.
为实现有机太阳能电池（OSC）的商业化，不仅提高功率转换效率（PCE）至关重要，而且通过合理的分子设计提高器件稳定性也很关键。最近出现的巨型分子受体（GMA）材料具有多种优势，如精确的化学结构、高分子量（有利于在多种外部应力下的薄膜稳定性）以及令人印象深刻的器件效率，使其成为有前途的候选材料。在此，我们报道了一种通过支链连接策略开发的树枝状六聚体受体，它克服了GMA的分子量瓶颈，并实现了超过58%的高产率。树枝状受体Six-IC表现出调制的结晶度和与供体的混溶性，因此与其单体DTC8相比具有更好的形态性能。其电荷传输能力通过臂单元之间的额外通道进一步增强。因此，基于D18:Six-IC的二元有机太阳能电池在基于高分子量受体的体系中实现了19.4%的前沿效率，以及良好的器件稳定性和薄膜延展性。这项工作报道了基于分子量超过10000 g/mol的树枝状分子受体的高性能有机太阳能电池，并分享了对设计综合高性能受体材料的理解。
