一种基于石墨烯的脉冲星导航X射线探测器

针对脉冲星导航要求X射线探测器具有高能量分辨率和高时间分辨率的需求，研究基于石墨烯电场效应来实现X射线探测的可行性。通过蒙特卡罗方法模拟不同能量X射线和不同厚度探测器基底的相互作用过程，得到不同厚度探测器对X射线的探测效率。利用有限元方法分析X射线在探测器内电离产生载流子的输运过程，验证了X射线入射对石墨烯电学特性的影响。理论分析计算探测器的时间分辨率和能量分辨率等指标参数，结果表明：基于石墨烯电场效应的X射线探测器具有较高的能量分辨率和时间分辨率，是一种潜力巨大的X射线探测方式，可满足未来脉冲星导航的工程应用。

An X ray Detector Based on Graphene for Pulsar Navigation

In view of the requirements of pulsar-based navigation on X-ray detector for high energy resolution and high temporal resolution, the feasibility of X-ray detection based on electric field effect of graphene is studied. Monte Carlo method is used to simulate the interaction process of X-rays with different energies and the substrates of the detectors with different thicknesses, and the detection efficiency of X-ray for detectors with different thicknesses is obtained. By using the finite element method, analysis of the transportation process of the carriers generated by X-ray in the detector is made, and the effect of the incident X-ray on the electrical properties of graphene is verified. Both temporal resolution and energy resolution of the detector are calculated theoretically, showing that because of its high energy resolution and time resolution, the X-ray detector based on field effect of the graphene has enormous potential for X-ray detection, and can meet the engineering application of the pulsar-based navigation in the future.