Wang Xiaoning, Wang Jianxiao, Wang Pengchao, Han Chenyu, Bi Fuzhen, Wang Junjie, Zheng Nan, Sun Cheng, Li Yonghai, Bao Xichang
Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Adv Mater. 2023 Dec;35(51):e2305652. doi: 10.1002/adma.202305652. Epub 2023 Nov 10.
The ternary strategy has been intensively studied to improve the power conversion efficiencies of organic photovoltaics. Thereinto, the location of the guest component plays a critical role, but few reports have been devoted to this concern. Hereon, the distribution of LA1 as a guest acceptor in a variety of ternary scenarios is reported and the dominating driving forces of managing the guest distribution and operating modes are outlined. Governed by the appropriate relationship of compatibility, crystallinity, and surface energies between host and guest acceptors, as well as interfacial interactions between donor and dual acceptors, most of the LA1 molecules permeate into the internal of host acceptor phases, forming embedded host/guest alloy-like aggregations. The characteristic distributions greatly optimize the morphologies, maximize energy transfer, and enhance exciton/charge behaviors. Particularly, PM6:IT-4F:LA1 ternary cells afford high efficiency of 15.27% with impressive fill factors (FF) over 81%. The popularization studies further verify the superiority of the LA1-involved alloy structures, and with the Y6-family acceptor as the host component, an outstanding efficiency of 19.17% is received. The results highlight the importance of guest distribution in ternary systems and shed light on the governing factors of distributing the guests in ternary cells.
为了提高有机光伏电池的功率转换效率，人们对三元策略进行了深入研究。其中，客体组分的位置起着关键作用，但针对这一问题的报道却很少。在此，本文报道了LA1作为客体受体在各种三元体系中的分布情况，并概述了控制客体分布和运行模式的主要驱动力。在主体和客体受体之间适当的相容性、结晶度和表面能关系以及供体和双受体之间的界面相互作用的支配下，大多数LA1分子渗透到主体受体相的内部，形成嵌入的主体/客体合金状聚集体。这种特征分布极大地优化了形貌，最大化了能量转移，并增强了激子/电荷行为。特别是，PM6:IT-4F:LA1三元电池实现了15.27%的高效率，填充因子（FF）超过81%，令人印象深刻。推广研究进一步验证了含LA1合金结构的优越性，以Y6族受体为主体组分时，获得了19.17%的优异效率。这些结果突出了客体分布在三元体系中的重要性，并揭示了在三元电池中分布客体的控制因素。
