![\"Enhanced](\"https:\/\/www.europesays.com\/uk\/wp-content\/uploads\/2025\/04\/enhanced-cspbbr3-x-ray.jpg\" "\\"Comparison")
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Comparison of X-ray imaging results for CsPbBr3 wafer-based X-ray detectors before and after grain boundary modification. Credit: Chen Ran<\/p>\n
In a major step forward for radiation detection technology, a research team led by Prof. Meng Gang from the Hefei Institutes of Physical Science of the Chinese Academy of Sciences has significantly enhanced the performance of CsPbBr3-based X-ray detectors by dramatically lowering their detection limit and suppressing noise and ion migration through innovative cooling and defect-passivation strategies.<\/p>\n
Their work, published in Applied Physics Letters<\/a> and Advanced Functional Materials<\/a>, lays the groundwork for the next generation of safer and more precise X-ray imaging technology.<\/p>\n One of the biggest challenges in utilizing CsPbBr3 for X-ray detectors has been minimizing noise and improving sensitivity.<\/p>\n To overcome this, the researchers applied a liquid nitrogen<\/a> cooling technique to CsPbBr3 single crystals, effectively eliminating deep-level defects that typically introduce noise. This approach boosted the material’s resistivity by two orders of magnitude and reduced the detection limit to 0.054 nGyair\u00b7s-1, enabling the detection of extremely weak X-ray signals.<\/p>\n The team also addressed the issue of ion migration in polycrystalline CsPbBr3 wafers, which are more practical for large-scale applications.<\/p>\n In collaboration with Prof. Fang Xiaosheng’s group from Fudan University, they developed a grain boundary passivation method that raised the ion migration activation energy to 0.56 eV. This significantly suppressed dark current drift under high electric fields, allowing the polycrystalline detector<\/a> to reach a detection limit of 9.41 nGyair\u00b7s-1 while maintaining excellent image contrast.<\/p>\n CsPbBr3 detectors could dramatically reduce the radiation dose<\/a> required for X-ray imaging, which is particularly important for vulnerable populations, such as children and pregnant women.<\/p>\n This advancement not only offers a clearer path toward next-generation X-ray detectors, but also accelerates the evolution of radiation imaging technology toward greater safety and precision.<\/p>\n More information:<\/strong> Xiao Zhao et al, 2\u2010Bromonaphthalene\u2010Induced Defect Passivation to Suppress Ion Migration in CsPbBr3 Wafer for X\u2010Ray Detector with Bias\u2010Resistant Stability, Advanced Functional Materials (2025). DOI: 10.1002\/adfm.202500039<\/a><\/p>\n \n\t\t\t\t\t\t\t\t\t\t\t\t\tProvided by \t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n \n\t\t\t\t\t\t\t\t\t\t\t\tCitation<\/strong>: \n\t\t\t\t\t\t\t\t\t\t\t This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
\n\t\t\t\t\t\t\t\t\t\t\t\tXiao Zhao et al, Freezing non-radiative recombination in high-performance CsPbBr3 single crystal X-ray detector, Applied Physics Letters (2024). DOI: 10.1063\/5.0224223<\/a>\n<\/p>\n
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tChinese Academy of Sciences<\/a>
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\n\t\t\t\t\t\t\t\t\t\t\t\tEnhanced CsPbBr\u2083 X-ray detectors achieve record-low detection limits (2025, April 15)
\n\t\t\t\t\t\t\t\t\t\t\t\tretrieved 16 April 2025
\n\t\t\t\t\t\t\t\t\t\t\t\tfrom https:\/\/phys.org\/news\/2025-04-cspbbr-ray-detectors-limits.html\n\t\t\t\t\t\t\t\t\t\t\t <\/p>\n
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