High-sensitivity X-ray Detectors Based on Solution-grown Caesium Lead Bromine Single Crystals
X-ray detection is of great significance for medical diagnostics, industrial non-destructive inspection, nuclear plants and scientific research. High sensitivity is needed for X-ray detector to reduce the radiation dose applied to human bodies for the applications of medical imaging and security check. Here, we report sensitive X-ray detectors made of solution-grown inorganic lead perovskite CsPbBr3 single crystals. Here, we report high quality inorganic lead perovskite CsPbBr3 single crystals using an improved low temperature solution method, which reveal hiqh transmittance, moblity and moblity-lifetime products. High sensitivity X-ray detectors were fabricated base on these crystals. Through designing the detector into asymmetric electrodes configuration, ion migration can be effectively suppressed under high voltage with low dark current and outstanding photoresponse. The optimized detector has a high sensitivity of 1256 μC•Gy-1cm-2 for 80 kVp X-ray detection under relatively low electric field of 20 V/mm, which is 60 times higher than commercial used α-Se detectors. Due to the facile synthesis, low cost, long-term stability, and high detection sensitivity, CsPbBr3 is expected to be an outstanding candidate of commercialized sensitive X-ray detector.
- This article is part of the themed collection: 2019 Journal of Materials Chemistry C HOT Papers