南京大学朱嘉团队和加利福尼亚大学团队联合揭示了分子间的相互作用对金属卤化物钙钛矿太阳能电池缺陷钝化性能和寿命的影响。 这一研究成果于2020年11月16日发表在国际顶尖学术期刊《美国化学会志》。

缺陷钝化是制备高效钙钛矿型太阳能电池（PSCs）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二次键合薄弱，但在恶劣操作条件下钝化效果的耐久性还没有得到广泛地研究。

在该文中，研究人员结合精心设计钝化剂来研究其相互作用能对钙钛矿晶体的影响，并将其与钝化效果的性能和寿命联系起来。结果表明，具有较强相互作用能的钝化剂不仅有利于缺陷钝化效果，而且有利于抑制缺陷的迁移。用最佳钝化剂处理的典型PSCs在连续光照或85℃氮气条件下1008h后，分别保持了初始性能的81.9%和85.3%，表现出优异的性能和运行稳定性。而在此期间，参考器件完全退化。

该研究为钙钛矿型光电器件的耐用缺陷钝化剂的设计提供了重要的方向。

附：英文原文

Title: Molecular Interaction Regulates the Performance and Longevity of Defect Passivation for Metal Halide Perovskite Solar Cells

Author: Yepin Zhao, Pengchen Zhu, Shu Huang, Shaun Tan, Minhuan Wang, Rui Wang, Jingjing Xue, Tae-Hee Han, Sung-Joon Lee, Anni Zhang, Tianyi Huang, Pei Cheng, Dong Meng, Jin-Wook Lee, Jaime Marian, Jia Zhu, Yang Yang

Issue&Volume: November 16, 2020

Abstract: 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. 

DOI: 10.1021/jacs.0c09560

Source: https://pubs.acs.org/doi/10.1021/jacs.0c09560