近日，北京科技大学张少青团队报道了基于吡嗪功能化聚合物供体的完全不熔融有机光伏系统。该研究于2026年6月24日发表在《中国化学》杂志上。

可溶液加工的有机光伏（OPV）电池展现出工业化应用前景；然而，高性能聚合物给体通常依赖于成本高昂的稠环结构。

研究组提出了一种新型聚合物给体4T-Pz，它是一种低成本、全非稠环给体，具有基于吡嗪的结构。得益于吡嗪单元引起的能级调控以及增强的主链平面性，4T-Pz呈现出深的HOMO能级（–5.38 eV）、显著的溶液态预聚集行为和良好的分子堆积特性，从而有利于高效的电荷产生和传输。当与两种非稠环受体A4T-16和TBT-26共混，形成全非稠环活性层时，优化后的OPV电池分别实现了14.2%和12.7%的能量转换效率。

4T-Pz:A4T-16体系因具有更低的能量损失、更弱的陷阱辅助复合、均匀的纤维状薄膜形貌以及紧凑的面朝上π-π堆积（有利于电荷传输），而表现出更优异的性能。成本分析证实了4T-Pz的竞争力，其纯材料成本（MOC）为11.63美元·克^-1，远低于稠环类似物。这项工作展示了基于吡嗪的全非稠环聚合物给体在平衡性能与成本方面的潜力，并为实现可规模化、高效率OPV提供了一条可行的材料设计途径。

附：英文原文

Title: Fully Non-Fused Organic Photovoltaic Systems Based on a Pyrazine-Functionalized Polymer Donor

Author: Enhui Zhai, Huixue Li, Junzhen Ren, Jiangbo Dai, Zhihao Chen, Jianqiu Wang, Shuohan Cheng, Wenye Xu, Shaoqing Zhang

Issue&Volume: 2026-06-24

Abstract: Solution-processable organic photovoltaic (OPV) cells show promise for industrialization; however, high-performance polymer donors often rely on costly fused-ring structures. Here, we propose a novel polymer donor, 4T-Pz, which is a low-cost, fully non-fused donor featuring a pyrazine-based structure. Benefiting from the energy-level modulation induced by pyrazine units and enhanced backbone planarity, 4T-Pz exhibits a deep HOMO level (–5.38 eV), pronounced solution-state pre-aggregation, and favorable molecular packing behavior, thereby facilitating efficient charge generation and transport. When blended with two non-fused acceptors, A4T-16 and TBT-26, to form fully non-fused active layers, the optimized OPV cells deliver power conversion efficiencies of 14.2% and 12.7%, respectively. The 4T-Pz:A4T-16 system shows superior performance due to lower energy loss, weaker trap-assisted recombination, a uniform fibrous film morphology, and compact face-on π–π stacking, which favors charge transport. Cost analysis confirms competitiveness of 4T-Pz, with materials-only cost (MOC) of 11.63 USD·g–1, far lower than that of fused-ring analogs. This work demonstrates the promise of pyrazine-based fully non-fused polymer donor in balancing performance and cost, and provides a viable materials-design route toward scalable, high-efficiency OPVs.

DOI: 10.1002/cjoc.70651

Source: https://onlinelibrary.wiley.com/doi/10.1002/cjoc.70651