Macroscopic Piezoelectricity of Halide Perovskite Single Crystals and Their Highly Sensitive Self-Powered X-ray Detectors.

The FAMAPbI single crystal has excellent semiconductor photoelectric performance and good stability; however, there have been conflicting opinions regarding its macroscopic piezoelectricity. Here, the FAMAPbI ( = 0-0.1) single crystals (FA SCs) exhibit a high macroscopic piezoelectric coefficient of over 10 pC/N.

Strain-Manipulated Photovoltaic and Photoelectric Effects of the MAPbBr Single Crystal.

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.