Halide perovskite materials have been recently recognized to possess potentially strong ferroelectricity and piezoelectricity even though the experimental evidence is very limited. Herein, we report high piezoelectricity of representative inorganic halide CsPbBr₃ thin films and their energy harvesting and current-sensing characteristics with an optimization process. This is the very first report of introducing an effective piezoelectric coefficient and energy-harvesting performance for inorganic halide perovskites. A record high piezoelectric coefficient of ∼40.3 pm V⁻¹ was obtained for the optimized CsPbBr₃, which was attributed to the extended bonding angles of Pb–Br–Pb and Br–Pb–Pb arising from the applied electric field according to structural simulations. As expected from the high piezoelectricity, the electromechanical energy-harvesting performance was very competitive with excellent values of a ∼16.4 V output voltage and ∼604 nA output current achieved for a large-scale harvester of 5 cm². Highly strain-sensitive devices were also successfully exemplified to identify specific body-motion from the detected current values in the sensitive inorganic halide patches.

中文翻译：

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无机卤化物钙钛矿薄膜高压电性的起源及其机电能量收集和生理电流感应特性

卤化物钙钛矿材料最近被认为具有潜在的强铁电性和压电性，尽管实验证据非常有限。在这里，我们报告了具有代表性的无机卤化物CsPbBr ₃薄膜的高压电性及其通过优化工艺获得的能量收集和电流感应特性。这是关于无机卤化物钙钛矿引入有效压电系数和能量收集性能的首次报道。优化的CsPbBr ₃获得了创纪录的〜40.3 pm V ^-1的高压电系数，这是由于根据结构模拟，由施加电场引起的Pb–Br–Pb和Br–Pb–Pb的扩展键角所致。正如从高压电性所预期的那样，机电能量收集性能极具竞争力，对于5 cm ²的大型收割机而言，其具有〜16.4 V的输出电压和〜604 nA的输出电流的极佳值。还高度成功地举例说明了高度应变敏感的设备，可以从敏感的无机卤化物斑块中检测到的电流值中识别出特定的身体运动。