In-situ fabricated perovskite nanocrystals in polymeric matrix provide new generation composite materials for plenty of cutting edge technology. In this work, we report the in-situ fabrication of copper halide perovskite (MA₂CuCl₄, MA:CH₃NH₃⁺) embedded poly(vinylidene fluoride) (PVDF) composite films. The optimized MA₂CuCl₄/PVDF composite films exhibit greatly enhanced piezo-response in comparasion with pure PVDF films. The enhancements were invesitgated and explained by applying piezo-response force microscopy (PFM) measurements and density functional theory (DFT) caculations. We proposed that the high piezoelectric properties of MA₂CuCl₄/PVDF composite films could be related to the large Cu off-centering displacement, the strong interactions between MA₂CuCl₄ and PVDF as well as large stress concentration around the MA₂CuCl₄ particles in the films. These piezoelectric composite films are expected to be suitable functional materials for flexible and/or wearable piezoelectrics.

在聚合物基质中原位制造的钙钛矿纳米晶体为大量尖端技术提供了新一代复合材料。在这项工作中，我们报告了原位制造卤化铜钙钛矿（MA ₂ CuCl ₄，MA:CH ₃ NH ₃ ⁺）嵌入聚（偏二氟乙烯）（PVDF）复合薄膜。与纯 PVDF 薄膜相比，优化后的 MA ₂ CuCl ₄ /PVDF 复合薄膜表现出大大增强的压电响应。通过应用压电响应力显微镜 (PFM) 测量和密度泛函理论 (DFT) 计算来研究和解释这些改进。我们提出MA ₂ CuCl的高压电特性₄ /PVDF复合薄膜可能与较大的Cu偏心位移、MA ₂ CuCl _{4与PVDF之间的强相互作用以及薄膜中MA 2} CuCl ₄颗粒周围的大应力集中有关。这些压电复合薄膜有望成为柔性和/或可穿戴压电材料的合适功能材料。