CsPbBr3-DMSO merged perovskite micro-bricks for efficient X-ray detection
Tongyu Shi, Wenjun Liu, Jiongtao Zhu, Xiongsheng Fan, Zhengyu Zhang, Xingchen He, Rui He, Jiahong Wang, Kezhen Chen, Yongshuai Ge, Xiangming Sun, Yanliang Liu, Paul K. Chu, Xue‐Feng Yu
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.