Khan Asif Abdullah, Mathur Avi, Yin Lu, Almadhoun Mahmoud, Yin Jian, Bagheri Majid Haji, Fattah Md Fahim Al, Rajabi-Abhari Araz, Yan Ning, Zhao Boxin, Maheshwari Vivek, Ban Dayan
Department of Electrical and Computer Engineering, University of Waterloo, 200 University Ave west, Waterloo, N2L 3G1, ON, Canada.
Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Ave West, Waterloo, N2L 3G1, ON, Canada.
Nat Commun. 2024 Nov 4;15(1):9511. doi: 10.1038/s41467-024-53846-6.
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 (ϵ) but reduce the dielectric strength (E). This guides our design: increase the dielectric constant by the high ϵ nanoparticle while enhancing the E 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 FAPbBrI 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 µAcmN. The intercalated electrodes boost the current density to 25 µAcmN, an order of magnitude enhancement for OHP composites, and higher than ceramic composites.
有机金属卤化物钙钛矿（OHP）复合材料具有柔韧性且易于合成，使其成为收集环境机械能的理想材料。然而，压电纳米发电机（PENG）的输出电流密度仍比其陶瓷同类产品低几个数量级。在先前的复合材料中，高介电常数纳米颗粒提高了介电常数（ϵ），但降低了介电强度（E）。这为我们的设计提供了指导：通过高ϵ纳米颗粒提高介电常数，同时通过优化钙钛矿结构来提高E。因此，我们对纳米颗粒进行化学功能化处理，以抑制其电触发的离子迁移，从而改善压电响应。用FAPbBrI功能化的聚苯乙烯使晶粒增大，卤离子均匀化，并在聚合物内部保持其结构完整性。因此，PENG产生的电流密度为2.6 µAcmN。插入式电极将电流密度提高到25 µAcmN，这对于OHP复合材料来说提高了一个数量级，并且高于陶瓷复合材料。
