Unraveling the Degradation Mechanisms of Perovskite Solar Cells under Mechanical Tensile Loads

作者：Runda Li, Zengyi Sun, Libing Yao, Jiwei Liu, Shaochen Zhang, Donger Jin, Zixuan Peng, Yuan Tian, Jingyi Sun, Pengju Shi, Kai Zhang, Sisi Wang, Jiazhe Xu, Mingsheng Xu, Deren Yang, Rui Wang, Jingjing Xue · 发表于：ACS Nano · 年份：2024 · DOI：10.1021/acsnano.4c08378 · 被引用次数：24 · 研究领域：Perovskite Materials and Applications、Conducting polymers and applications、Chalcogenide Semiconductor Thin Films

The short longevity of perovskite solar cells (PSCs) is the major hurdle toward their commercialization. In recent years, mechanical stability has emerged as a pivotal aspect in enhancing the overall durability of PSCs, prompting a myriad of strategies devoted to this issue. However, the mechanical degradation mechanisms of PSCs remain largely unexplored, with corresponding studies mainly limited to perovskite single crystals, neglecting the complexity and nuances present in PSC devices based on polycrystalline perovskite thin films. Herein, we reveal the underlying mechanisms of the mechanical degradation of formamidinium-based PSCs, which are the most prevalent high-performance PSC candidates. Under uniaxial tensile loads, we found that the degradation is mainly attributed to the sequential increase in the density of micropores and halide defects within the perovskite films. This phenomenon is consistent across various perovskite compositions and environmental conditions. Our findings elucidate mechanistic insights for more targeted mitigation strategies aimed at addressing the mechanical degradation of PSC devices.