硅油辅助法制备用于X射线探测的高质量MAPbX(I、Cl)_(3)单晶  

Preparation of High-Quality MAPbX(I,Cl)_(3) Perovskite Single Crystals for X-Ray Detection Using Silicone-Oil Assisted Method

作　　者：张子明 赵一英[1] ZHANG Zi-ming;ZHAO Yi-ying(Institute of Materials,China Academy of Engineering Physics,Jiangyou 621908,China)

机构地区：[1]中国工程物理研究院材料研究所,四川江油621908

出　　处：《核化学与放射化学》2024年第1期75-84,I0007,共11页Journal of Nuclear and Radiochemistry

基　　金：四川省科技厅项目(No.2021JDTD0021);中国工程物理研究院创新基金(CX20210037)。

摘　　要：高质量大尺寸的块体单晶对研究钙钛矿材料的基本特性和高能射线探测成像有重要价值。使用硅油辅助法制备MAPbI3单晶和MAPbCl_(3)单晶,并对其光电性能和X射线探测性能进行表征。结果表明:硅油辅助法生长的单晶质量和性能比逆温生长法获得的单晶更好,MAPbI3单晶的(110)晶面摇摆曲线半峰宽达到0.011 2°,荧光寿命为1 022 ns,缺陷态密度最低达到5.61×10^(9)cm^(-3);MAPbCl_(3)单晶的(100)晶面摇摆曲线半峰宽达到0.014 3°,荧光寿命为957 ns,缺陷态密度最低达到3.57×10^(9)cm^(-3)。基于MAPbI3单晶的X射线探测器获得7 300μC/(Gy·cm^(2))的高灵敏度。上述结果表明:硅油辅助法适合于大批量生产辐射探测用的高质量钙钛矿单晶。High quality and large size bulk single crystals are essential to study the basic properties of perovskite materials and their performance limits of X-ray detection and imaging.In this paper,high quality MAPbI 3 and MAPbCl 3 single crystals were prepared using the silicone-oil assisted method and the properties and the performance of the single crystals and the corresponding X-ray detectors were characterized.These performances of single crystals grown with the silicone-oil assisted method are better than those prepared with the inverse temperature crystallization method(ITC).The ITC,as one of the most prevailing crystal growth methods,has drawbacks over the control of the nucleation and the growth rate.Silicone-oil assisted method was recently developed to overcome the above drawbacks and grew the perovskite single crystals in a controllable manner.In the silicone-oil assisted method,a capping layer on the precursor is adopted to reduce the solvent evaporation rate to a certain level and thus to manage the precursor in a slightly supersaturated condition.Silicone oil is selected as the capping layer for its smaller density and the insolubility with the precursor.The solvent in precursor will diffuse through the silicone oil capping layer and evaporate into the air at the silicone oil/air interface,driven by the content difference and the saturation vapor pressure,respectively.The silicone-oil assisted method realizes the constant growth of perovskite single crystals,since the driving force of the crystallization relies on the solvent diffusion rate but not the temperature-depended solubility.During the perovskite crystal growth process,the precursor is at a steady condition(constant temperature and constant concentration)in majority of the time.According to the classic growth theory,single crystals grown at a constant rate will have better crystal quality.Indeed,MAPbI 3 single crystals grown with the silicone-oil assisted method have a FWHM of rocking curves of(110)crystal planes of 0.0112°,the fluorescence lif

关 键 词：钙钛矿单晶 晶体生长 硅油辅助法 X射线探测器 

分 类 号：TL816.1[核科学技术—核技术及应用] O782[理学—晶体学]