Ultraviolet‐Visible‐Short‐Wavelength Infrared Broadband and Fast‐Response Photodetectors Enabled by Individual Monocrystalline Perovskite Nanoplate

Abstract

AbstractPerovskite‐based photodetectors exhibit potential applications in communication, neuromorphic chips, and biomedical imaging due to their outstanding photoelectric properties and facile manufacturability. However, few of perovskite‐based photodetectors focus on ultraviolet‐visible‐short‐wavelength infrared (UV–Vis–SWIR) broadband photodetection because of the relatively large bandgap. Moreover, such broadband photodetectors with individual nanocrystal channel featuring monolithic integration with functional electronic/optical components have hardly been explored. Herein, an individual monocrystalline MAPbBr3 nanoplate‐based photodetector is demonstrated that simultaneously achieves efficient UV–Vis–SWIR detection and fast‐response. Nanoplate photodetectors (NPDs) are prepared by assembling single nanoplate on adjacent gold electrodes. NPDs exhibit high external quantum efficiency (EQE) and detectivity of 1200% and 5.37 × 1012 Jones, as well as fast response with rise time of 80 µs. Notably, NPDs simultaneously achieve high EQE and fast response, exceeding most perovskite devices with multi‐nanocrystal channel. Benefiting from the high specific surface area of nanoplate with surface‐trap‐assisted absorption, NPDs achieve high performance in the near‐infrared and SWIR spectral region of 850–1450 nm. Unencapsulated devices show outstanding UV‐laser‐irradiation endurance and decent periodicity and repeatability after 29‐day‐storage in atmospheric environment. Finally, imaging applications are demonstrated. This work verifies the potential of perovskite‐based broadband photodetection, and stimulates the monolithic integration of various perovskite‐based devices.