Dimensionally-engineered perovskite heterostructures are highly attractive, as recently shown to be useful for enhancing the stability and efficiency in perovskite solar cells. Here, we first report piezo-electric and -phototronic effects found in two-dimensional (2D)|3D perovskite heterostructures under various pressures. The piezo-electric and -phototronic effects are strongly enhanced by employing 2D|3D heterostructure instead of a 3D single layer in the perovskite devices, which is believed to be due to energy-band modulation and band-misalignment lessening by piezoelectrically-polarized charges induced under moderate compressive pressure. Furthermore, the perovskite 2D|3D piezo-electric and -phototronic device shows only a 29% reduction of its initial performance even under 30-days atmospheric conditions and almost perfect endurance properties. These results suggest that dimensionally-engineered perovskite heterostructures may provide a fundamentally good way to improve perovskite-based electronic and optoelectronic devices.

尺寸工程化的钙钛矿异质结构极具吸引力，如最近显示的可用于增强钙钛矿太阳能电池的稳定性和效率。在这里，我们首先报道在各种压力下在二维（2D）| 3D钙钛矿异质结构中发现的压电和光电子效应。压电和-phototronic效果通过采用二维大力加强| 3D异质的，而不是一个钙钛矿装置中的3D单层，这被认为是由于在中等压缩压力下感应的压电极化电荷导致能带调制和谱带失准减少。此外，即使在30天的大气条件下，钙钛矿2D | 3D压电和光电子器件的初始性能也仅降低了29％，并且具有近乎完美的耐久性。这些结果表明，尺寸工程化的钙钛矿异质结构可能为改善基于钙钛矿的电子和光电器件提供了根本上好的方法。