Wang Boxin, Cheng Qian, Huang Gaosheng, Yue Yaochang, Zhang Weichuan, Li Xing, Li Yanxun, Du Wenna, Liu Xinfeng, Zhang Hong, Zhang Yuan, Zhou Huiqiong
CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190, China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.
Adv Mater. 2023 Feb;35(5):e2207345. doi: 10.1002/adma.202207345. Epub 2022 Dec 20.
Quasi-2D Ruddlesden-Popper (RP) perovskites with superior stability are admirable candidates for perovskite solar cells (PSCs) toward commercialization. However, the device performance remains unsatisfactory due to the disordered crystallization of perovskites. In this work, the effects of sulfonium cations on the evolution of intermediates and photovoltaic properties of 2D RP perovskites are investigated. The introduction of sulfonium cations leads to preferred intermediate transformation and improved film quality of perovskites. The resulting devices deliver a champion efficiency of 19.08% at room temperature and 20.52% at 180 K, due to reduced recombination and enhanced charge transport. More importantly, the unencapsulated device maintains 84% of the initial efficiency under maximum power point (MPP) tracking at 40 °C for 1000 h. This work helps to gain a comprehensive understanding of the crystallization process of quasi-2D perovskites and provides a simple strategy to modulate the intermediates of perovskites.
具有卓越稳定性的准二维Ruddlesden-Popper（RP）钙钛矿是钙钛矿太阳能电池（PSC）商业化的理想候选材料。然而，由于钙钛矿的无序结晶，器件性能仍不尽人意。在这项工作中，研究了锍阳离子对二维RP钙钛矿中间体演化和光伏性能的影响。锍阳离子的引入导致了中间体的优先转化，并改善了钙钛矿的薄膜质量。由于复合减少和电荷传输增强，所得器件在室温下的冠军效率为19.08%，在180 K时为20.52%。更重要的是，未封装的器件在40°C下最大功率点（MPP）跟踪1000小时后，仍保持初始效率的84%。这项工作有助于全面了解准二维钙钛矿的结晶过程，并提供了一种调节钙钛矿中间体的简单策略。
