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Research Article

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

Tongyu Shi1,2,§, Wenjun Liu1,3,§, Jiongtao Zhu1, Xiongsheng Fan1, Zhengyu Zhang1, Xingchen He1, Rui He1, Jiahong Wang1,2, Kezhen Chen1,2, Yongshuai Ge1,2, Xiangming Sun4, Yanliang Liu1,2( ), Paul K. Chu5, Xue-Feng Yu1,2( )
Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
University of Chinese Academy of Sciences, Beijing 100049, China
Nano Science and Technology Institute, University of Science and Technology of China, Suzhou 215123, China
Key Laboratory of Quark and Lepton Physics (MOE), Central China Normal University, Wuhan 430079, China
Department of Physics, Department of Materials Science and Engineering, and Department of Biomedical Engineering, City University of Hong Kong, Hong Kong 999077, China

§ Tongyu Shi and Wenjun Liu contributed equally to this work.

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Graphical Abstract

A solvent-based approach is designed and demonstrated to produce CsPbBr3 micro-bricks for compact microcrystalline perovskite wafers for X-ray detectors. The direct X-ray detector with the structure of Au/perovskite/[6,6]-phenyl C61 butyric acid methyl (PCBM)/Au shows a high sensitivity of 14,430 µC·Gyair−1·cm−2 and low detection limit of 564 nGyair·s−1.

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 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 (μτ) product of 5.16 × 10-4 cm2·V−1, high sensitivity of 14,430 µC·Gyair−1·cm−2, low detection limit of 564 nGyair·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.

Keywords

CsPbBr3-DMSOinorganic perovskites wafergrain growthcrystal defectX-ray detector

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Nano Research
Volume 16 Issue 7,
July 2023
Pages 9983-9989
DOI: 10.1007/s12274-023-5487-3
Cite this article:
Shi T, Liu W, Zhu J, et al. CsPbBr3-DMSO merged perovskite micro-bricks for efficient X-ray detection. Nano Research, 2023, 16(7): 9983-9989. https://doi.org/10.1007/s12274-023-5487-3
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Received: 30 October 2022
Revised: 19 December 2022
Accepted: 09 January 2023
Published: 20 February 2023
© Tsinghua University Press 2023
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