Indigo: A Natural Molecular Passivator for Efficient Perovskite Solar Cells

作者：

Junjun Guo¹, Jianguo Sun¹, Long Hu², Shiwen Fang¹, Xufeng Ling¹, Xuliang Zhang¹, Yao Wang¹, Hehe Huang¹, Chenxu Han¹, Claudio Cazorla⁴, Yingguo Yang⁵, Dewei Chu³, Tom Wu³, Jianyu Yuan^1，*, Wanli Ma^1，*

单位：

¹Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, P. R. China.

²School of Engineering, Macquarie University, Sydney, Australia.

³School of Materials Science and Engineering, University of New South Wales (UNSW), Sydney, Australia.

⁴Department de Física, Universitat Politècnica de Catalunya, Barcelona, Spain.

⁵Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, P. R. China.

摘要：

Organic-inorganic hybrid lead halide perovskite solar cells have made unprecedented progress in improving photovoltaic efficiency during the past decade, while still facing critical stability challenges. Herein, the natural organic dye Indigo was explored for the first time to be an efficient molecular passivator that assist in the preparation of high-quality hybrid perovskite film with reduced defects and enhanced stability. The Indigo molecule with both carbonyl and amino groups can provide bifunctional chemical passivation for defects. In-depth theoretical and experimental studies show that the Indigo molecules can firmly bind to perovskite surfaces, enhancing the crystallization of perovskite films with improved morphology. Consequently, the Indigo-passivated perovskite film exhibits increased grain size with better uniformity, reduced grain boundaries, lowered defect density and retarded ion migration, boosting the device efficiency up to 23.22%, and ~21% for large-area device (1 cm2). Furthermore, the Indigo passivation can enhance device stability in terms of both humidity and thermal stress. These results provide not only new insights into the multi-passivation role of natural organic dyes but also a simple and low-cost strategy to prepare high-quality hybrid perovskite films for optoelectronic applications based on Indigo derivatives.

影响因子：

29.368

分区情况：

一区

链接：

https://onlinelibrary.wiley.com/doi/10.1002/aenm.202200537