材料科学
钙钛矿(结构)
晶界
弯曲
相对湿度
极限抗拉强度
钝化
脆性
复合材料
弹性体
化学工程
纳米技术
微观结构
图层(电子)
工程类
物理
热力学
作者
Ziyuan Chen,Qinrong Cheng,Haiyang Chen,Yeyong Wu,Junyuan Ding,Xiaoxiao Wu,Heyi Yang,Heng Liu,Weijie Chen,Xiaohua Tang,Xinhui Lu,Yaowen Li,Yaowen Li
标识
DOI:10.1002/adma.202300513
摘要
Flexible perovskite solar cells (pero-SCs) are the best candidates to complement traditional silicon SCs in portable power applications. However, their mechanical, operational, and ambient stabilities are still unable to meet the practical demands because of the natural brittleness, residual tensile strain, and high defect density along the perovskite grain boundaries. To overcome these issues, a cross-linkable monomer TA-NI with dynamic covalent disulfide bonds, H-bonds, and ammonium is carefully developed. The cross-linking acts as "ligaments" attached on the perovskite grain boundaries. These "ligaments" consisting of elastomers and 1D perovskites can not only passivate the grain boundaries and enhance moisture resistance but also release the residual tensile strain and mechanical stress in 3D perovskite films. More importantly, the elastomer can repair bending-induced mechanical cracks in the perovskite film because of dynamic self-healing characteristics. The resultant flexible pero-SCs exhibit promising improvements in efficiency, and record values (23.84% and 21.66%) are obtained for 0.062 and 1.004 cm2 devices; the flexible devices also show overall improved stabilities with T90 >20 000 bending cycles, operational stability with T90 >1248 h, and ambient stability (relative humidity = 30%) with T90 >3000 h. This strategy paves a new way for the industrial-scale development of high-performance flexible pero-SCs.
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