材料科学
微晶
粘弹性
钙钛矿(结构)
扩散
晶界
复合材料
弹性模量
纳米技术
化学工程
微观结构
冶金
热力学
物理
工程类
作者
Yijing Sun,Qianqian Yao,Weiwei Xing,Jian‐Jun He,Yingbo Li,Miao Chen,Xiaoyue Zhang,Weiming Xiong,Wanpeng Zhu,Yue Zheng
标识
DOI:10.1021/acsami.2c01632
摘要
Organic-inorganic hybrid perovskite (OIHP) polycrystalline films are the key light-absorbing layers of laminated-structure OIHP-based devices that have attracted increasing attention in photoelectronics and flexible electronics. Internal stresses induced by the mismatched responses of laminated layers to long-term and cyclic multiphysical fields generate time-dependent mechanical deformation in OIHP polycrystalline films, which makes the mechanical constitution relation of great significance. However, few studies focus on either the mechanical properties and behaviors of OIHP polycrystalline films or the underlying mechanism coupled with the grain structure and ion diffusion. Here, we uncovered the heterogeneous viscoelasticity of MAPbBr3 films strongly correlated with the grain structure. Combining experiments and modeling, we revealed that the organic cation diffusion from grain interiors to grain boundaries leads to heterogeneity in the chemical distribution and viscoelastic modulus. Our work provides the nanomechanical understanding of the OIHP polycrystalline films that are crucial for safety design and performance optimization in OIHP-based electronics.
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