Yu Jianxin, Xie Gang, Zheng Sisi, Chen Jintao, Feng Chuizheng, Li Huiyu, Zhou Rihui, Wang Zhiping, Liu Liqian, Zhao Jianwei, Liang Aihui, Chen Yiwang
College of Chemistry and Materials/Key Laboratory of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, Jiangxi Normal University, Nanchang 330022, China.
State Key Laboratory of Luminescent Materials and Devices/School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China.
ACS Nano. 2024 Aug 20;18(33):22533-22547. doi: 10.1021/acsnano.4c08168. Epub 2024 Aug 8.
Organic-inorganic hybrid metal halide perovskite solar cells have been considered as one of the most promising next-generation photovoltaic technologies. Nevertheless, perovskite defects and Li ionic migration will seriously affect the power conversion efficiency and stability of the formal device. Herein, we designed two crown ether derivatives (PC12 and PC15) with different cavity diameters, which selectively bind to different metal cations. It is found that PC15 in perovskite precursor solution can actively regulate the nucleation and crystallization processes and passivate the uncoordinated Pb ions, while PC12 at the interface between the perovskite layer and hole-transporting layer can effectively inhibit the migration of Li ions and reduce nonradiative recombination losses. Therefore, PC12 and PC15 can act as "lubricant" and defect passivators, as well as inhibitors of ion migration, when they are synergistically applied at the surface and bulk of perovskite layer. Consequently, the optimized device achieved a champion efficiency of 24.8% with significantly improved humidity, thermal, and light stability.
有机-无机杂化金属卤化物钙钛矿太阳能电池被认为是最有前途的下一代光伏技术之一。然而，钙钛矿缺陷和锂离子迁移会严重影响传统器件的功率转换效率和稳定性。在此，我们设计了两种具有不同空腔直径的冠醚衍生物（PC12和PC15），它们能选择性地与不同金属阳离子结合。研究发现，钙钛矿前驱体溶液中的PC15可以积极调节成核和结晶过程，并钝化未配位的Pb离子，而在钙钛矿层和空穴传输层之间的界面处的PC12可以有效抑制锂离子的迁移并减少非辐射复合损失。因此，当PC12和PC15在钙钛矿层的表面和体相中协同应用时，它们可以充当“润滑剂”和缺陷钝化剂，以及离子迁移抑制剂。结果，优化后的器件实现了24.8%的最佳效率，其湿度、热稳定性和光稳定性都有显著提高。
