Breaking dielectric dilemma via polymer functionalized perovskite piezocomposite with large current density output

Asif Abdullah Khan, Avi Mathur, Lu Yin, Mahmoud Almadhoun, Jian Yin, Majid Haji Bagheri, Md Fahim Al Fattah, Araz Rajabi-Abhari, Ning Yan, Boxin Zhao, Vivek Maheshwari () and Dayan Ban ()
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Asif Abdullah Khan: University of Waterloo
Avi Mathur: University of Waterloo
Lu Yin: University of Waterloo
Mahmoud Almadhoun: University of Waterloo
Jian Yin: University of Waterloo
Majid Haji Bagheri: University of Waterloo
Md Fahim Al Fattah: University of Waterloo
Araz Rajabi-Abhari: University of Toronto
Ning Yan: University of Toronto
Boxin Zhao: University of Waterloo
Vivek Maheshwari: University of Waterloo
Dayan Ban: University of Waterloo

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Organometal halide perovskite (OHP) composites are flexible and easy to synthesize, making them ideal for ambient mechanical energy harvesting. Yet, the output current density from the piezoelectric nanogenerators (PENGs) remains orders of magnitude lower than their ceramic counterparts. In prior composites, high permittivity nanoparticles enhance the dielectric constant (ϵr) but reduce the dielectric strength (Eb). This guides our design: increase the dielectric constant by the high ϵr nanoparticle while enhancing the Eb by optimizing the perovskite structure. Therefore, we chemically functionalize the nanoparticles to suppress their electrically triggered ion migration for an improved piezoelectric response. The polystyrene functionalizes with FAPbBr2I enlarges the grains, homogenizes the halide ions, and maintains their structural integrity inside a polymer. Consequently, the PENG produces a current density of 2.6 µAcm−2N−1. The intercalated electrodes boost the current density to 25 µAcm−2N−1, an order of magnitude enhancement for OHP composites, and higher than ceramic composites.

Date: 2024
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DOI: 10.1038/s41467-024-53846-6

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