非对称接触诱导的自供电MAPbBr₃光电探测器

Asymmetrically Contact-Induced Self-Powered MAPbBr₃ Photodetector

半导体单晶由于内部具有低的缺陷密度、高的迁移率,而被认为是制备光电器件的优选材料。从应用的角度考虑,如果一个光电探测器可以无需外部供电即可工作,它将具有节能、器件小型化等优点,因此受到了研究者们的广泛关注。本研究工作中,以一种有机–无机杂化的钙钛矿单晶作为光吸收层,利用两种具有不同功函数的金属作为电极,从而导致两个电极与单晶接触的界面处实现了一个非对称的肖特基势垒,最终在该器件中实现了自驱动的工作模式。该自驱动的光电探测器在520 nm处的响应度高达0.39 A•W−1,器件具有快速的响应时间(上升沿:9 µs,下降沿:864 µs)。本工作为下一步开发高性能的自驱动光电探测器提供了一个科学指导和实验基础。

Semiconductor single crystal is considered as the preferred material for photoelectric devices due to its low defect density and high mobility. From the perspective of application, if a photodetector can work without an external power supply, it will have the advantages of energy saving and device miniaturization, so it has been widely concerned by researchers. In this work, an organic-inorganic hybrid perovskite single crystal is used as the light absorption layer, and two metals with different work functions are used as the electrodes, resulting in the realization of an asymmetric Schottky barrier at the interface between the two electrodes and the single crystal. Finally, the self-driven operation mode is realized in the device. The self-driven photodetector has a high responsivity of 0.39 A•W−1 at 520 nm and a fast response time (rising edge: 9 µs, falling edge: 864 µs). This work provides the scientific guidance and experimental basis for the development of high-performance self-driven photodetectors.