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人工晶体学报 ›› 2025, Vol. 54 ›› Issue (7): 1272-1281.DOI: 10.16553/j.cnki.issn1000-985x.2025.0081

• 研究论文 • 上一篇    下一篇

基于RP型层状钙钛矿CHA2PbBr4单晶的高效X射线探测

郑璐瑛1,2(), 王芳1,2, 许谢铭1,3, 王帅华1(), 吴少凡1   

  1. 1.中国科学院福建物质结构研究所,福州 350002
    2.福建师范大学化学与材料学院,福州 350117
    3.中国福建光电信息科学与技术创新实验室,福州 350108
  • 收稿日期:2025-04-15 出版日期:2025-07-20 发布日期:2025-07-30
  • 通信作者: 王帅华,博士,正高级工程师。E-mail:shwang@fjirsm.ac.cn
  • 作者简介:郑璐瑛(1999—),女,湖南省人,硕士研究生。E-mail:zhengluying@fjirsm.ac.cn
    王帅华,中国科学院福建物质结构研究所,正高级工程师,博士生导师,国家级青年人才,中国科学院青促会会员。主要从事人工晶体生长和辐射探测材料制备研究,先后主持国家和省部级项目20余项,发表论文50余篇,荣获福建省科技进步二等奖一项。
  • 基金资助:
    中国科学院仪器设备研制项目(PTYQ2025TD0012);国家重点研发计划(2022YFB3605703);福建省杰出青年基金项目(2023J06051);闽都创新实验室产学研专项(2024CXY109)

High-Efficiency X-Ray Detection of Layered Perovskite Single Crystals Based on Ruddlesden-Popper (RP)-Type CHA2PbBr4

ZHENG Luying1,2(), WANG Fang1,2, XU Xieming1,3, WANG Shuaihua1(), WU Shaofan1   

  1. 1.Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China
    2.College of Chemistry and Materials,Fujian Normal University,Fuzhou 350117,China
    3.Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou 350108,China
  • Received:2025-04-15 Online:2025-07-20 Published:2025-07-30

摘要: 半导体辐射探测材料作为X射线成像技术的核心元件,在医学影像、工业检测等方面有着广泛的应用。近年来,三维钙钛矿材料凭借大原子序数、强光电转换及低制备成本,在半导体辐射探测领域展现出巨大应用潜力。然而,该材料体系面临显著的离子迁移特性带来的暗电流高、稳定性差等挑战,严重制约其器件化应用进程。本工作聚焦结构维度调控策略,引入环己胺(CHA)来切割三维卤铅骨架,形成层状钙钛矿CHA2PbBr4,实现高效稳定的X射线探测。基于优化降温的溶剂热合成工艺,制备出毫米级CHA2PbBr4单晶,呈现出定向生长的层状形貌。得益于层状结构对离子迁移与暗电流的抑制特性,CHA2PbBr4单晶呈现1.64×1010 Ω·cm的高电阻率,且该单晶器件在高电场条件下展现出可达3 791.4 μC·Gyair-1·cm-2的高灵敏度性能及低至84.55 nGyair·s-1的优异探测极限。上述结果表明引入有机长链带来的结构层状化可实现辐射探测多性能的协同优化,这为开发综合性能优异的X射线探测器提供了潜力备选材料。

关键词: 层状钙钛矿; 二维结构; 单晶探测器; X射线探测; 性能调控

Abstract: Semiconductor radiation detection materials, as core components of X-ray imaging technology, have been widely applied in medical imaging and industrial inspection. In recent years, three-dimensional (3D) perovskite materials have been demonstrated significant potential in semiconductor radiation detection due to their high atomic number, strong photoelectric conversion efficiency, and low fabrication cost. However, challenges for the materials, such as severe ionic migration-induced high dark current and instability, critically hinder their practical device applications. In this study, based on structural dimensionality modulation strategy, cyclohexylamine (CHA) was introduced to slice the 3D halogen-lead skeleton and to form layered perovskites CHA2PbBr4, achieving highly efficient and stable X-ray detection. Millimeter-sized CHA2PbBr4 single crystals were synthesized via a optimize-cooling solvothermal method, exhibiting with layered morphology with orientated growth. Benefiting from the suppressed ionic migration and dark current enabled by the layered structure, the CHA2PbBr4 single crystal exhibits a high resistivity of 1.64×1010 Ω·cm, as well as single-crystal device demonstrates a remarkable sensitivity of 3 791.4 μC·Gyair-1·cm-2 under high electric field and an ultra-low detection limit of 84.55 nGyair·s-1. These results demonstrate that layered structural modulation of organic long-chains enables synergistic optimization of multi radiation detection performances, providing a potential candidate for high-performance X-ray detectors.

Key words: layered perovskite; two-dimensional structure; single crystal detector; X-ray detection; performance modulation

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