hBN材料中缺陷对中子探测器性能的影响

本项目针对固态中子探测器研制的重要材料学、物理学问题，应用新的探测材料及探测原理，基于参研单位在相关研究领域已取得的研究成果和研究基础，提出研究宽禁带六方氮化硼（hBN）材料中缺陷对中子探测器性能的影响。项目拟：1）应用材料中缺陷研究的先进实验方法-正电子湮没谱学，结合中子辐照实验，研究hBN材料的缺陷构型、电荷态、空位-杂质复合体等关键缺陷态特性；2）首创性的应用太赫兹时域光谱技术，测量中子辐照前、中、后hBN材料中的载流子浓度、弛豫时间、迁移率等重要物理参数，获得缺陷态对载流子浓度和载流子散射影响的微观物理学信息；3）应用探测器信号读出电子学测量，获得基于hBN的中子探测器的器件设计、制备方案和技术路线。该项目将先进实验测量方法与新的中子探测器原理、材料及器件结合，可为自主研制新型、低成本、高探测效率、适应恶劣环境的热中子探测器打下材料和器件物理研究基础，有望获得原创性重要研究成果。

The project is targeted on the important problems of material science and physics in the development of solid-state neutron detector, the application of new detector materials and detection principles. Based on the research achievements and research basis of the collaborator in the relevant research fields, we propose to study the influence of defects in wide band gap hexagonal boron nitride (hBN) materials on the performance of neutron detector. The project plans to: 1) study the defect configuration, charge state, vacancy impurity complex and other key defect state characteristics of hBN materials by using the advanced experimental methods of defect research in materials- positron annihilation spectroscopy and neutron irradiation experiments; 2) be the first to measure the carrier concentration, relaxation time, mobility and other important physical parameters in hBN materials before, during and after neutron irradiation by using the terahertz time domain spectroscopy technology, obtain microphysical information of the influence of defect state on carrier concentration and carrier scattering; 3) obtain the device design, preparation scheme and technical route of neutron detector based on hBN by measurement of detector signal with read-out electronic. The project combines advanced experimental measurement methods with new neutron detector principles, materials and devices, which can lay a solid foundation for the physical research of materials and devices for independently developing new type, low cost, high detection efficiency and adapting to harsh environment neutron detector, and is expected to obtain important original research results.