河南理工大学李猛团队报道了混合锡铅钙钛矿太阳能电池埋底界面的多功能改性。相关研究成果于2024年8月5日发表在国际顶尖学术期刊《德国应用化学》。

混合锡铅钙钛矿太阳能电池可以达到低至1.2 eV的带隙，提供高理论效率，并作为所有钙钛矿叠层太阳能电池的基础材料。然而，界面处的不稳定性和高缺陷密度，特别是埋底表面，对性能的改善有限。

该文中，研究人员介绍了用多功能羟胺盐对底部钙钛矿界面的改性。这些盐可以有效地协调不同的钙钛矿组分，在调节结晶过程和钝化不同性质的缺陷方面具有关键影响。表面改性减少了界面处的陷阱，防止了过量碘化铅的形成，提高了薄膜的质量。改进后的装置的填充系数达到81%，效率高达23.8%。未封装的改性装置在货架储存2000小时后，保持了95%以上的初始效率。

附：英文原文

Title: Multifunctional Modification of the Buried Interface in Mixed Tin-Lead Perovskite Solar Cells

Author: Xinru Sun, Hongzhuo Wu, Zhihao Li, Rui Zhu, Guixiang Li, Zhenhuang Su, Junhan Zhang, Xingyu Gao, Jorge Pascual, Antonio Abate, Meng Li

Issue&Volume: 2024-08-05

Abstract: Mixed tin-lead perovskite solar cells can reach bandgaps as low as 1.2 eV, offering high theoretical efficiency and serving as base materials for all-perovskite tandem solar cells. However, instability and high defect densities at the interfaces, particularly the buried surface, have limited performance improvements. In this work, we present the modification of the bottom perovskite interface with multifunctional hydroxylamine salts. These salts can effectively coordinate the different perovskite components, having critical influences in regulating the crystallization process and passivating defects of varying nature. The surface modification reduced traps at the interface and prevented the formation of excessive lead iodide, enhancing the quality of the films. The modified devices presented fill factors reaching 81% and efficiencies of up to 23.8%. The unencapsulated modified devices maintained over 95% of their initial efficiency after 2000 h of shelf storage.

DOI: 10.1002/anie.202409330

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202409330