Department of Chemistry, Waterloo Institute of Nanotechnology, 200 University Ave. West, Waterloo, ON, N2L 3G1, Canada.
Adv Mater. 2018 Mar;30(9). doi: 10.1002/adma.201705778. Epub 2018 Jan 15.
Organolead trihalide perovskite MAPbI shows a distinctive combination of properties such as being ferroelectric and semiconducting, with ion migration effects under poling by electric fields. The combination of its ferroelectric and semiconducting nature is used to make a light harvesting, self-powered tactile sensor. This sensor interfaces ZnO nanosheets as a pressure-sensitive drain on the MAPbI film and once poled is operational for at least 72 h with just light illumination. The sensor is monolithic in structure, has linear response till 76 kPa, and is able to operate continuously as the energy harvesting mechanism is decoupled from its pressure sensing mechanism. It has a sensitivity of 0.57 kPa , which can be modulated by the strength of the poling field. The understanding of these effects in perovskite materials and their application in power source free devices are of significance to a wide array of fields where these materials are being researched and applied.
有机铅卤钙钛矿 MAPbI 具有独特的性质组合，例如铁电性和半导体性，并具有电场极化下的离子迁移效应。其铁电和半导体性质的结合被用于制造光收集、自供电触觉传感器。该传感器以 ZnO 纳米片作为 MAPbI 薄膜上的压敏漏极，一旦极化，在光照射下至少可运行 72 小时。该传感器结构为整体式，在 76kPa 以下具有线性响应，并且由于能量收集机制与压力感应机制解耦，因此能够连续运行。其灵敏度为 0.57kPa，可以通过极化场的强度进行调节。对钙钛矿材料中这些效应的理解及其在无电源设备中的应用对于广泛的研究和应用这些材料的领域具有重要意义。
