Visible Light-Triggered Self-Welding Perovskite Solar Cells and Modules

• Published in: Advanced materials (Weinheim) 2024-11, p.e2410338
• Main Authors: Li, Xiongjie, Ding, Bin, Huang, Junyi, Zhang, Zhiguo, Dong, Hongliang, Yu, Haixuan, Liu, Zhirong, Dai, Letian, Shen, Yan, Ding, Yong, Dyson, Paul J, Nazeeruddin, Mohammad Khaja, Wang, Mingkui
• Format: Article
• Language: English
• ISSN: 0935-9648; 1521-4095; 1521-4095
• DOI: 10.1002/adma.202410338

Flexible perovskite solar cells (F-PSCs) are highly promising for both stationary and mobile applications because of their advantageous features, including mechanical flexibility, their lightweight and thin nature, and cost-effectiveness. However, a number of drawbacks, such as mechanical instability, make their practical application difficult. Here, self-welding dynamic diselenide that is triggered by visible light into the structure of F-PSCs to improve their long-term stability by repairing cracks and defects in the absorber layer is incorporated. The diselenide confers the flexibility and self-welding properties to the Cs MA FA PbI perovskite layer, enabling optimized F-PSC devices to achieve a power conversion efficiency of 24.85% while retaining ca. 92% of their initial efficiency after undergoing 15 000 bending cycles at a curvature radius of 3 mm. The corresponding flexible large-scale module with an active area of 15.82 cm achieved a record PCE of 21.65%.