Light-Triggered Sustainable Defect-Passivation for Stable Perovskite Photovoltaics

作者：

Yi-Ran Shi¹, Kai-Li Wang¹, Yan-Hui Lou², Gen-Lin Liu¹, Chun-Hao Chen¹, Jing Chen¹, Liang Zhang¹, and Zhao-Kui Wang^1,*

单位：

¹Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Advanced Negative Carbon Technologies, Soochow University, Suzhou, Jiangsu 215123, China

²College of Energy, Soochow Institute for Energy and Materials Innovations, College of Energy, Soochow University, Suzhou, Jiangsu 215123, China

摘要：

The generation of photoinduced defects and freely moving halogen ions is dynamically updated in real time. Accordingly, most reported strategies are static and short-term, which make their improvements in photostability very limited. Therefore, seeking for new passivation strategies to match the dynamic characteristics of defect generation is very urgent. Without newly generated defects, the passivation molecule should exist in the configuration which would not become the initiation sites for defect generation. With newly generated defects, the passivation molecule should transfer into the other configuration which owns the passivation sites. Herein, we adopted a classical photoisomeric molecule spiropyran, whose pre and post isomeric forms meet the requirements for two different configurations, to realize the state transition once the photo induced defects appear during subsequent operation and dynamic capture for continuous renewal defects. Consequently, spiropyrans worked as the light-triggered and self-healing sustainable passivation sites to realize continuous defects repairing. The target devices kept 93% and 99% of their initial power conversion efficiencies after 456 h aging under ultraviolet illumination and 1200 h aging under full-spectrum illumination, respectively. This work provides a novel concept of sustainable passivation strategy to realize continuous defect-passivation and film-healing in perovskite photovoltaics.

影响因子：

30.849

分区情况：

一区

链接：

https://onlinelibrary.wiley.com/doi/10.1002/adma.202205338