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

作者：Shi, Tongyu; Liu, Wenjun; Zhu, Jiongtao; Fan, Xiongsheng; Zhang, Zhengyu; He, Xingchen; He, Rui; Wang, Jiahong; Chen, Kezhen; Ge, Yongshuai; Sun, Xiangming; Liu, Yanliang^*; Chu, Paul K.; Yu, Xue-Feng^*

来源：Nano Research, 2023, 16(7): 9983-9989.

DOI：10.1007/s12274-023-5487-3

• CsPbBr3-DMSO
• inorganic perovskites wafer
• grain growth
• crystal defect
• X-ray detector

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 CsPbBr3 micro-bricks powder at room temperature. The CsPbBr3 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 CsPbBr3 micro-bricks via Pb-O bonding, forming the CsPbBr3-DMSO adduct. During hot isostatic processing, the released DMSO vapor merges the CsPbBr3 micro-bricks, producing a compact and dense CsPbBr3 wafer with minimized grain boundaries and excellent charge transport properties. The CsPbBr3 wafer shows a large mobility-lifetime (mu tau) product of 5.16 x 10(-)(4) cm(2).V--(1), high sensitivity of 14,430 mu C.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.

• 单位
  中国科学院; 中国科学院研究生院