Wu Linze, Yun Maojin, Qin Jianqiang, Huang Sihao, Ou Zeping, Li Qian, Wang Xiaowu, Yuan Wenqian, Dong Li, Cheng Xi, Yang Yingguo, Zheng Yujie, Sun Kuan, Zhang Zeyu, Hu Zhiping, Liu Zhengzheng, Leng Yuxin, Du Juan
College of Physics, Center for Marine Observation and Communications, Qingdao University, Qingdao, 266071, China.
School of Physics and Optoelectronic Engineering, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310024, China.
Small. 2024 Dec;20(52):e2408610. doi: 10.1002/smll.202408610. Epub 2024 Oct 20.
Recently, volatile solid additives have attracted tremendous interest in the field of organic solar cells (OSCs), which can effectively improve device efficiency without sacrificing the reproducibility and stability of the device. However, the structure of reported solid additives is onefold and its working mechanism needs to be further investigated. Herein, a novel non-halogenated and twisted solid additive 1,4-diphenoxybenzene (DPB) is employed to optimize the morphology of the active layer in OSCs. The properties of additive DPB, morphology of active layer, and carrier dynamics behaviors have been systematically investigated through theoretical calculations, in situ and ex situ spectroscopy, grazing-incidence wide-angle X-ray scattering (GIWAXS), and grazing-incidence small-angle X-ray scattering (GISAXS) measurement, as well as ultrafast spectroscopy technology. The results reveal that the twisted additive DPB selectively interacts with acceptor Y6, and thus forms optimized morphology of active layer with increased molecular crystallinity, tight molecular packing, and favorable phase separation. As a result, the optimized devices deliver a remarkable power conversion efficiency (PCE) of 19.04%, which is the highest value for the D18-Cl:N3 system to date. These results demonstrate that non-halogenated and twisted solid additive DPB has broad prospects in the preparation of highly efficient OSCs, providing theoretical and experimental guidance for the development of high-performance solid additives.
最近，挥发性固体添加剂在有机太阳能电池（OSCs）领域引起了极大的关注，它可以在不牺牲器件再现性和稳定性的情况下有效提高器件效率。然而，已报道的固体添加剂结构单一，其作用机制有待进一步研究。在此，一种新型的非卤化扭曲固体添加剂1,4-二苯氧基苯（DPB）被用于优化OSCs中活性层的形貌。通过理论计算、原位和非原位光谱、掠入射广角X射线散射（GIWAXS）和掠入射小角X射线散射（GISAXS）测量以及超快光谱技术，系统地研究了添加剂DPB的性质、活性层的形貌和载流子动力学行为。结果表明，扭曲的添加剂DPB与受体Y6选择性相互作用，从而形成了具有更高分子结晶度、紧密分子堆积和良好相分离的活性层优化形貌。因此，优化后的器件实现了19.
