Chen Dong, Yao Jia, Chen Lie, Yin Jingping, Lv Ruizhi, Huang Bin, Liu Siqi, Zhang Zhi-Guo, Yang Chunhe, Chen Yiwang, Li Yongfang
College of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, China.
Jiangxi Provincial Key Laboratory of New Energy Chemistry, Institute of Polymers, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, China.
Angew Chem Int Ed Engl. 2018 Apr 16;57(17):4580-4584. doi: 10.1002/anie.201800035. Epub 2018 Mar 13.
All-polymer solar cells (all-PSCs) can offer unique advantages for applications in flexible devices, and naphthalene diimide (NDI)-based polymer acceptors are the widely used polymer acceptors. However, their power conversion efficiency (PCE) still lags behind that of state-of-the-art polymer solar cells, due to low light absorption, suboptimal energy levels and the strong aggregation of the NDI-based polymer acceptor. Herein, a rhodanine-based dye molecule was introduced into the NDI-based polymer acceptor by simple random copolymerization and showed an improved light absorption coefficient, an up-shifted lowest unoccupied molecular orbital level and reduced crystallization. Consequently, additive-free all-PSCs demonstrated a high PCE of 8.13 %, which is one of the highest performance characteristics reported for all-PSCs to date. These results indicate that incorporating a dye into the n-type polymer gives insight into the precise design of high-performance polymer acceptors for all-PSCs.
全聚合物太阳能电池（全PSC）在柔性器件应用中具有独特优势，基于萘二亚胺（NDI）的聚合物受体是广泛使用的聚合物受体。然而，由于光吸收低、能级不理想以及基于NDI的聚合物受体的强烈聚集，它们的功率转换效率（PCE）仍落后于最先进的聚合物太阳能电池。在此，通过简单的无规共聚将一种基于罗丹宁的染料分子引入基于NDI的聚合物受体中，该受体表现出改善的光吸收系数、上移的最低未占据分子轨道能级以及减少的结晶。因此，无添加剂的全PSC表现出8.13%的高PCE，这是迄今为止报道的全PSC的最高性能特征之一。这些结果表明，将染料掺入n型聚合物中有助于深入了解用于全PSC的高性能聚合物受体的精确设计。
