Zhang Kang-Ning, Du Xiao-Yan, Yan Lei, Pu Yong-Jin, Tajima Keisuke, Wang Xingzhu, Hao Xiao-Tao
School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, Shandong, 250100, P. R. China.
Academy for Advanced Interdisciplinary Studies and Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China.
Small Methods. 2024 Feb;8(2):e2300397. doi: 10.1002/smtd.202300397. Epub 2023 May 19.
Benefiting from the synergistic development of material design, device engineering, and the mechanistic understanding of device physics, the certified power conversion efficiencies (PCEs) of single-junction non-fullerene organic solar cells (OSCs) have already reached a very high value of exceeding 19%. However, in addition to PCEs, the poor stability is now a challenging obstacle for commercial applications of organic photovoltaics (OPVs). Herein, recent progress made in exploring operational mechanisms, anomalous photoelectric behaviors, and improving long-term stability in non-fullerene OSCs are highlighted from a novel and previously largely undiscussed perspective of engineering exciton and charge carrier pathways. Considering the intrinsic connection among multiple temporal-scale photocarrier dynamics, multi-length scale morphologies, and photovoltaic performance in OPVs, this review delineates and establishes a comprehensive and in-depth property-function relationship for evaluating the actual device stability. Moreover, this review has also provided some valuable photophysical insights into employing the advanced characterization techniques such as transient absorption spectroscopy and time-resolved fluorescence imagings. Finally, some of the remaining major challenges related to this topic are proposed toward the further advances of enhancing long-term operational stability in non-fullerene OSCs.
受益于材料设计、器件工程以及对器件物理机理的协同发展，单结非富勒烯有机太阳能电池（OSC）的认证功率转换效率（PCE）已达到超过19%的非常高的值。然而，除了PCE之外，稳定性差现在是有机光伏（OPV）商业应用面临的一个具有挑战性的障碍。在此，从工程激子和电荷载流子途径这一新颖且此前在很大程度上未被讨论的角度，突出了非富勒烯OSC在探索运行机制、异常光电行为以及提高长期稳定性方面取得的最新进展。考虑到OPV中多个时间尺度光载流子动力学、多长度尺度形态与光伏性能之间的内在联系，本综述描绘并建立了一个全面且深入的性质-功能关系，用于评估实际器件的稳定性。此外，本综述还提供了一些关于采用瞬态吸收光谱和时间分辨荧光成像等先进表征技术的有价值的光物理见解。最后，针对提高非富勒烯OSC长期运行稳定性的进一步进展，提出了与该主题相关的一些剩余主要挑战。
