Halide Perovskite Inducing Anomalous Nonvolatile Polarization in Poly(vinylidene fluoride)-based Flexible Nanocomposites

Yao Wang (), Chen Huang, Ziwei Cheng, Zhenghao Liu, Yuan Zhang, Yantao Zheng, Shulin Chen, Jie Wang, Peng Gao, Yang Shen, Chungang Duan, Yuan Deng, Ce-Wen Nan and Jiangyu Li ()
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Yao Wang: Beihang University
Chen Huang: Beihang University
Ziwei Cheng: Beihang University
Zhenghao Liu: Southern University of Science and Technology
Yuan Zhang: Southern University of Science and Technology
Yantao Zheng: Beihang University
Shulin Chen: Peking University
Jie Wang: Zhejiang University
Peng Gao: Peking University
Yang Shen: Tsinghua University
Chungang Duan: East China Normal University
Yuan Deng: Beihang University
Ce-Wen Nan: Tsinghua University
Jiangyu Li: Southern University of Science and Technology

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Ferroelectric materials have important applications in transduction, data storage, and nonlinear optics. Inorganic ferroelectrics such as lead zirconate titanate possess large polarization, though they are rigid and brittle. Ferroelectric polymers are light weight and flexible, yet their polarization is low, bottlenecked at 10 μC cm−2. Here we show poly(vinylidene fluoride) nanocomposite with only 0.94% of self-nucleated CH3NH3PbBr3 nanocrystals exhibits anomalously large polarization (~19.6 μC cm−2) while retaining superior stretchability and photoluminance, resulting in unprecedented electromechanical figures of merit among ferroelectrics. Comprehensive analysis suggests the enhancement is accomplished via delicate defect engineering, with field-induced Frenkel pairs in halide perovskite stabilized by the poled ferroelectric polymer through interfacial coupling. The strategy is general, working in poly(vinylidene fluoride-co-hexafluoropropylene) as well, and the nanocomposite is stable. The study thus presents a solution for overcoming the electromechanical dilemma of ferroelectrics while enabling additional optic-activity, ideal for multifunctional flexible electronics applications.

Date: 2024
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DOI: 10.1038/s41467-024-48348-4

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