UV photodetector properties of CsPbCl3 grown by Vertical Bridgman method

Abstract

The all-inorganic perovskite CsPbCl3 holds significant promise in ultraviolet (UV) photodetector due to its good optoelectronic properties and suitable band gap. Owe to the limited solubility of CsCl in the precursor solution, most CsPbCl3 material obtained by the solution method are nanocrystals, and only a few UV photodetectors based on CsPbCl3 crystal have been reported. It is proved that single crystal has fewer defects and grain boundaries, making them more suitable for photodetectors than polycrystals. In this study, high-quality CsPbCl3 crystal was obtained by the Vertical Bridgman method, and planar Au/CsPbCl3/Au photodetector was constructed by magnetron sputtering. The photodetector performance was investigated and it shows the low dark current of 0.88nA, the Detectivity up to 3.3 × 1010 Jones and the fastest response time of 104 ms. The detector also demonstrated good stability. This work indicates that CsPbCl3 crystals can be used as UV detectors.