Ding Yecheng, Zhao Xuefeng, Zhao Zeen, Wang Yaojin, Wu Tom, Yuan Guoliang, Liu Jun-Ming
School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu210094, People's Republic of China.
School of Materials Science and Engineering, University of New South Wales (UNSW), Sydney, New South Wales2052, Australia.
ACS Appl Mater Interfaces. 2022 Nov 23;14(46):52134-52139. doi: 10.1021/acsami.2c13349. Epub 2022 Nov 14.
Lead halide perovskite materials, such as MAPbBr and MAPbI, show excellent semiconductor properties, and thus, they have attracted a lot of attention for applications in solar cells, photodetectors, etc. Here, a periodic strain can dynamically manipulate the build-in electric field () of the depletion region with piezoelectricity at the Au/MAPbBr interface. As a result, the photovoltaic short-circuit current density () and the open-circuit voltage () are increased by 670 and 82%, respectively, by applying an external strain upon an asymmetric solar-cell-like Au/MAPbBr/Ga structure. Furthermore, the equivalent piezoelectric values of ∼3.5 pC/N are confirmed in the Au/MAPbBr/Au structure with both the sinusoidal strain and the 405 nm light illumination with 220 mW/cm upon one semitransparent Au electrode. This study not only proves that pressure can effectively enhance the energy conversion efficiency of the halide perovskite-based solar cells and light detectors but also supposes a multifunctional sensor, which can detect light intensity, sense dynamic pressure, explore accelerated speed, etc. simultaneously.
卤化铅钙钛矿材料，如MAPbBr和MAPbI，具有优异的半导体性能，因此，它们在太阳能电池、光电探测器等应用中备受关注。在此，周期性应变可通过Au/MAPbBr界面处的压电效应动态调控耗尽区的内建电场（）。结果，在类似非对称太阳能电池的Au/MAPbBr/Ga结构上施加外部应变时，光伏短路电流密度（）和开路电压（）分别提高了670%和82%。此外，在半透明Au电极之一上施加正弦应变和220 mW/cm的405 nm光照的Au/MAPbBr/Au结构中，确认了约3.5 pC/N的等效压电值。该研究不仅证明压力可有效提高卤化铅钙钛矿基太阳能电池和光探测器的能量转换效率，还设想了一种多功能传感器，其可同时检测光强、感知动态压力、探测加速度等。
