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刘生忠教授团队在零维非铅钙钛矿单晶X射线成像取得重要进展
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近日,材料科学与工程学院刘生忠教授团队利用近年在高质量大尺寸钙钛矿单晶生长的技术积累成功设计集成了大尺寸零维结构非铅(类)钙钛矿单晶高性能X射线成像器件。团队成员采用低温溶液生长策略,成功制备了大尺寸零维结构铋基钙钛矿(CH3NH3)3Bi2I9(MA3Bi2I9)单晶。实验证明,该单晶具有很高的X射线吸收率、很低的缺陷态密度、低离子迁移率、高体电阻率以及很好的环境稳定性等卓越特性,在MA3Bi2I9单晶上设计制备集成的X射线探测器表现出优异的性能。在60 V mm-1的电场下,探测器的灵敏度达到1947.3 μC Gyair-1cm-2,检测限低于83 nGyairs-1,远低于常规医疗诊断剂量标准(5.5 µGyairs-1)。此外,MA3Bi2I9单晶X射线探测器的基线漂移率为5.0×10-10nA cm-1s-1V-1,比三维结构的MAPbI3钙钛矿单晶低7个数量级(2.0×10-3nA cm-1s-1V-1),保证了器件很好的工作稳定性和高信噪比,从而实现了高灵敏稳定的X射线成像。

XIANGGUANJIEGUOYITIWEI“0D-Structured Lead-Free Perovskite Single Crystals for Highly Sensitive Stable X‑ray Imaging”FABIAOZAICell PressQIXIAQIKANMatterSHANG。DIYIZUOZHEWEICAILIAOKEXUEYUGONGCHENGXUEYUANBOSHISHENGLIUYUCHENG,XUZHUOBOSHIHOUHEYANGZHOUFUJIAOSHOUWEIGONGTONGDIYIZUOZHE,LIUSHENGZHONGJIAOSHOUWEITONGXUNZUOZHE。

LUNWENLIANJIE:

YISHANGGONGZUODEDAOLEMEIGUOXIBEIDAXUEMercouri G. KanatzidisJIAOSHOUTUANDUIHEXIANJIAOTONGDAXUELIUMINGJIAOSHOUTUANDUIDENGDEZHICHIHEBANGZHU。

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