Guo Haodan, Fang Yanyan, Cheng Hong-Bo, Wu Jinpeng, Lei Yan, Wang Shumao, Li Xiangrong, Dai Yuhua, Xiang Wanchun, Xue Ding-Jiang, Lin Yuan, Hagfeldt Anders
Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Angew Chem Int Ed Engl. 2022 Jun 20;61(25):e202204148. doi: 10.1002/anie.202204148. Epub 2022 Apr 21.
Defect passivation via post-treatment of perovskite films is an effective method to fabricate high-performance perovskite solar cells (PSCs). However, the passivation durability is still an issue due to the weak and vulnerable bonding between passivating functional groups and perovskite defect sites. Here we propose a cholesterol derivative self-assembly strategy to construct crosslinked and compact membranes throughout perovskite films. These supramolecular membranes act as a robust protection layer against harsh operational conditions while providing effective passivation of defects from surface toward inner grain boundaries. The resultant PSCs exhibit a power conversion efficiency of 23.34 % with an impressive open-circuit voltage of 1.164 eV. The unencapsulated devices retain 92 % of their initial efficiencies after 1600 h of storage under ambient conditions, and remain almost unchanged after heating at 85 °C for 500 h in a nitrogen atmosphere, showing significantly improved stability.
通过对钙钛矿薄膜进行后处理来实现缺陷钝化是制备高性能钙钛矿太阳能电池（PSC）的有效方法。然而，由于钝化官能团与钙钛矿缺陷位点之间的键合较弱且易受损，钝化耐久性仍然是一个问题。在此，我们提出一种胆固醇衍生物自组装策略，以在整个钙钛矿薄膜中构建交联且致密的膜。这些超分子膜作为一层坚固的保护层，可抵御恶劣的工作条件，同时从表面到内部晶界提供有效的缺陷钝化。由此制备的PSC表现出23.34%的功率转换效率，开路电压高达1.164 eV，令人印象深刻。未封装的器件在环境条件下储存1600小时后仍保留其初始效率的92%，并且在氮气气氛中于85°C加热500小时后几乎保持不变，稳定性得到显著提高。
