Spindt型与薄膜场致发射的数值模拟与特性比较

Numerical simulation and characteristic comparison of Spindt type and diamond film field emisson

采用质点网格法(particle in cell),利用MAGIC软件模拟了场致发射的物理过程.对两种典型的场致发射模型(Spindt阴极发射体和金刚石薄膜发射体)分别进行了模拟.对Spindt阴极发射,研究了发射特性与尖端尺寸,尖端与栅极面的相对高度的关系.对金刚石薄膜发射,比较了三极管和四极管的发射特性,以及薄膜面积对发射特性的影响,得出金刚石薄膜发射体优于Spindt发射体的特性.

By using the electromagnetic particle-in-cell( PIC) MAGIC code, the process of field emission is simulated. The simulation includes two representative field emission devices(Spindt-type field emitter and diamond film field emitter). For Spindt-type field emitter, the relation between the characteristics and the radius of curvature of the emitter tip, the relative height between the emitter tip and the gate are studied. As regards the diamond film field emitter, the characteristics of field emission microtriodes and microtetrodes are compared with each other and the influence of the area of diamond film is investigated. The results show that the characteristics of diamond film field emitter has an advantage over Spindt-type field emitter.