Chen Hao, Zhao Yuanyuan, Bian Liqiang, Cao Yusheng, Li Linde, Zhang Yan, Duan Jialong, Guo Qiyao, Zhang Qiang, Tang Qunwei
College of Energy Storage Technology, Shandong University of Science and Technology, Qingdao 266590, China.
College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
ACS Appl Mater Interfaces. 2025 Apr 9;17(14):21469-21477. doi: 10.1021/acsami.5c01359. Epub 2025 Apr 1.
The buried interface plays a critical role in determining both the efficiency and stability of perovskite solar cells (PSCs). However, defect states and energy level misalignment at the SnO/perovskite interface can lead to significant charge recombination, severely limiting device performance. Herein, multifunctional interface modifiers based on alkali metal carbonates are introduced for carbon-based CsPbBr PSCs. The CO anions not only passivate oxygen vacancy (O) defects and undercoordinated Sn ions on the SnO surface to enhance electron transfer but also passivate undercoordinated Pb ions at the perovskite interface, improving the overall quality of the perovskite film. Additionally, the alkali cations were found to diffuse into the perovskite bulk, enhancing crystal quality and suppressing nonradiative recombination. By leveraging this multifaceted interface engineering approach, a champion CsPbBr PSC achieved an impressive PCE of 10.70%. Importantly, the unencapsulated devices maintain 85% of initial efficiency under high humidity (85% RH) and heat (85 °C) over 50 days.
埋入式界面在决定钙钛矿太阳能电池（PSC）的效率和稳定性方面起着关键作用。然而，SnO/钙钛矿界面处的缺陷态和能级失配会导致显著的电荷复合，严重限制器件性能。在此，基于碱金属碳酸盐的多功能界面改性剂被引入用于碳基CsPbBr PSC。CO阴离子不仅钝化SnO表面的氧空位（O）缺陷和配位不足的Sn离子以增强电子转移，还钝化钙钛矿界面处配位不足的Pb离子，提高钙钛矿薄膜的整体质量。此外，发现碱金属阳离子扩散到钙钛矿体相中，提高晶体质量并抑制非辐射复合。通过利用这种多方面的界面工程方法，一个冠军CsPbBr PSC实现了令人印象深刻的10.70%的光电转换效率（PCE）。重要的是，未封装的器件在高湿度（85%相对湿度）和高温（85°C）下50天内保持初始效率的85%。
