CsPbBr3-DMSO merged perovskite micro-bricks for efficient X-ray detection

Abstract

Inorganic perovskite wafers with good stability and adjustable sizes are promising in X-ray detection but the high synthetic temperature is a hindrance. Herein, dimethyl sulfoxide (DMSO) is used to prepare the CsPbBr 3 micro-bricks powder at room temperature. The CsPbBr 3 powder has a cubic shape with few crystal defects, small charge trap density, and high crystallinity. A trace amount of DMSO attaches to the surface of the CsPbBr 3 micro-bricks via Pb-O bonding, forming the CsPbBr 3 -DMSO adduct. During hot isostatic processing, the released DMSO vapor merges the CsPbBr 3 micro-bricks, producing a compact and dense CsPbBr 3 wafer with minimized grain boundaries and excellent charge transport properties. The CsPbBr 3 wafer shows a large mobility-lifetime (μτ) product of 5.16 × 10 − 4 cm 2 ·V − 1 , high sensitivity of 14,430 μC·Gy air −1 ·cm −2 , low detection limit of 564 nGy air ·s −1 , as well as robust stability in X-ray detection. The results reveal a novel strategy with immense practical potential pertaining to high-contrast X-ray detection.