Dynamic covalent polymer engineering for stable and self-healing perovskite solar cells

Peng Xu; Jian Liu; Shuai Wang; Jiujiang Chen; Bin Han; Yuanyuan Meng; Shuncheng Yang; Lisha Xie; Mengjin Yang; Runping Jia; Ziyi Ge

doi:10.1039/D3MH01293J

Dynamic covalent polymer engineering for stable and self-healing perovskite solar cells†

Peng Xu,‡^ab Jian Liu,‡^a Shuai Wang,^b Jiujiang Chen,^a Bin Han,^a Yuanyuan Meng,^a Shuncheng Yang,^a Lisha Xie,^ac Mengjin Yang,

*^ac Runping Jia

*^b and Ziyi Ge

*^ac

Author affiliations

* Corresponding authors

^a Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China
E-mail: yangmengjin@nimte.ac.cn, geziyi@nimte.ac.cn

^b School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, P. R. China
E-mail: jiarp@sit.edu.cn

^c Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, P. R. China

Abstract

Perovskite films are susceptible to degradation during their service period due to their weak mechanical properties. Acylhydrazone-bonded waterborne polyurethane (Ab-WPU) was employed as dynamic covalent polymer engineering to develop self-healing perovskite solar cells (SHPSCs). Ab-WPU enhances the crystallinity of the perovskite film, passivates the defects of the perovskite film through functional groups, and demonstrates promising flexibility and mild temperature self-healing properties of SHPSCs. The champion efficiency of SHPSCs on rigid and flexible substrates reaches 24.2% and 21.27% respectively. The moisture and heat stability of devices were improved. After 1000 bending cycles, the Ab-WPU-modified flexible device can be restored to an efficiency of over 95% of its original efficiency by heating to 60 °C. This is because the dynamic acylhydrazone bond can be activated to repair perovskite film defects at a mild temperature of 60 °C as evidenced by in situ AFM studies. This strategy provides an effective pathway for dynamic self-healing materials in PSCs under operational conditions.

This article is part of the themed collection: Celebrating the 20th Anniversary of the Ningbo Institute of Materials Technology and Engineering

Materials Horizons

Dynamic covalent polymer engineering for stable and self-healing perovskite solar cells†

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