Issue 11, 2023

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

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.

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

Supplementary files

Article information

Article type
Communication
Submitted
15 Pha 2023
Accepted
11 Leo 2023
First published
13 Leo 2023

Mater. Horiz., 2023,10, 5223-5234

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

P. Xu, J. Liu, S. Wang, J. Chen, B. Han, Y. Meng, S. Yang, L. Xie, M. Yang, R. Jia and Z. Ge, Mater. Horiz., 2023, 10, 5223 DOI: 10.1039/D3MH01293J

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