LAUSR

The relatively low resistivity and severe ion migration in inorganic perovskite CsPbBr3 significantly degrade the performance of X-ray detectors due to their high detection limit and current drift. We investigate the electrical properties and X-ray detection performances of CsPbBr3-n In single crystals by doping the iodine atoms into the melt-grown CsPbBr3 crystals. The resistivity of CsPbBr3-n In single crystals increases from 3.6 × 109 (CsPbBr3 ) to 2.2 × 1011 (CsPbBr2 I) Ω·cm as the iodine content increases, restraining the leak current and decreasing the detection limit of the detector. Additionally, CsPbBr3-n In single crystals exhibit stable dark currents under an electric field of 5000 V cm-1 , arising from their high ion migration activation energy. A record sensitivity of 6.3 × 104 μC Gy-1  cm-2 (CsPbBr2.9 I0.1 ) and a low detection limit of 54 nGy s-1 (CsPbBr2 I) are achieved by CsPbBr3-n In single crystals for the 120 keV hard X-ray detection under a 5000 V cm-1 electrical field. The CsPbBr2.9 I0.1 detector shows a stable current response with a dark current density of 0.58 μA cm-2 for 30 days and clear imaging for 120 keV X-rays at ambient conditions. The effective iodine atom doping strategy and the high quality make the CsPbBr3-n In SCs single crystals promising for reproducible high-energy hard X-ray imaging systems. This article is protected by copyright. All rights reserved.