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
Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055 China.
University of Chinese Academy of Sciences, Beijing, 100049 China.
Nano Res. 2023 Feb 20:1-7. doi: 10.1007/s12274-023-5487-3.
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 CsPbBr micro-bricks powder at room temperature. The CsPbBr 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 CsPbBr micro-bricks via Pb-O bonding, forming the CsPbBr-DMSO adduct. During hot isostatic processing, the released DMSO vapor merges the CsPbBr micro-bricks, producing a compact and dense CsPbBr wafer with minimized grain boundaries and excellent charge transport properties. The CsPbBr wafer shows a large mobility-lifetime (μτ) product of 5.16 × 10 cm·V, high sensitivity of 14,430 μC·Gy·cm, low detection limit of 564 nGy·s, 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.
Supplementary material (further details of the characterization, SEM images, AFM images, KPFM images, schematic illustration, XRD patterns, XPS spectra, FTIR spectra, UPS spectra, and stability tests) is available in the online version of this article at 10.1007/s12274-023-5487-3.
具有良好稳定性和可调节尺寸的无机钙钛矿晶圆在X射线检测中很有前景，但高合成温度是一个障碍。在此，使用二甲基亚砜（DMSO）在室温下制备CsPbBr微砖粉末。CsPbBr粉末呈立方形状，晶体缺陷少，电荷陷阱密度小，结晶度高。微量的DMSO通过Pb-O键附着在CsPbBr微砖表面，形成CsPbBr-DMSO加合物。在热等静压过程中，释放的DMSO蒸汽使CsPbBr微砖合并，产生具有最小晶界和优异电荷传输性能的致密CsPbBr晶圆。CsPbBr晶圆显示出5.16×10 cm·V的大迁移率-寿命（μτ）乘积、14430 μC·Gy·cm的高灵敏度、564 nGy·s的低检测限以及在X射线检测中具有强大的稳定性。结果揭示了一种在高对比度X射线检测方面具有巨大实际潜力的新策略。
补充材料（表征的进一步细节、扫描电子显微镜图像、原子力显微镜图像、开尔文探针力显微镜图像、示意图、X射线衍射图谱、X射线光电子能谱、傅里叶变换红外光谱、紫外光电子能谱和稳定性测试）可在本文的在线版本中获取，链接为10.1007/s12274-023-5487-3。
