Zhao Yepin, Zhu Pengchen, Huang Shu, Tan Shaun, Wang Minhuan, Wang Rui, Xue Jingjing, Han Tae-Hee, Lee Sung-Joon, Zhang Anni, Huang Tianyi, Cheng Pei, Meng Dong, Lee Jin-Wook, Marian Jaime, Zhu Jia, Yang Yang
National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, School of Physics, and Jiangsu Key Laboratory of Artificial Functional Materials, Nanjing University, Nanjing 210093, China.
Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea.
J Am Chem Soc. 2020 Nov 25;142(47):20071-20079. doi: 10.1021/jacs.0c09560. Epub 2020 Nov 16.
Defect passivation constitutes one of the most commonly used strategies to fabricate highly efficient perovskite solar cells (PSCs). However, the durability of the passivation effects under harsh operational conditions has not been extensively studied regardless of the weak and vulnerable secondary bonding between the molecular passivation agents and perovskite crystals. Here, we incorporated strategically designed passivating agents to investigate the effect of their interaction energies on the perovskite crystals and correlated these with the performance and longevity of the passivation effects. We unraveled that the passivation agents with a stronger interaction energy are advantageous not only for effective defect passivation but also to suppress defect migration. The prototypical PSCs treated with the optimal passivation agent exhibited superior performance and operational stability, retaining 81.9 and 85.3% of their initial performance under continuous illumination or nitrogen at 85 °C after 1008 h, respectively, while the reference device completely degraded during that time. This work provides important insights into designing operationally durable defect passivation agents for perovskite optoelectronic devices.
缺陷钝化是制造高效钙钛矿太阳能电池（PSC）最常用的策略之一。然而，尽管分子钝化剂与钙钛矿晶体之间的次级键较弱且易受影响，但在苛刻的工作条件下钝化效果的耐久性尚未得到广泛研究。在此，我们战略性地引入了经过设计的钝化剂，以研究它们的相互作用能对钙钛矿晶体的影响，并将这些与钝化效果的性能和寿命相关联。我们发现，具有较强相互作用能的钝化剂不仅有利于有效的缺陷钝化，而且还能抑制缺陷迁移。用最佳钝化剂处理的典型PSC表现出卓越的性能和运行稳定性，在连续光照或85°C氮气环境下1008小时后，分别保留了其初始性能的81.9%和85.3%，而参考器件在此期间完全降解。这项工作为设计用于钙钛矿光电器件的具有持久运行性能的缺陷钝化剂提供了重要见解。
