利用三维粒子模拟软件对大面积生长无序碳纳米管冷阴级三级结构发射特性进行仿真,对六边形、三角形和正方形3种不同网孔结构栅网下的碳纳米管冷阴极场致发射特性进行研究。通过计算冷阴极表面电场分布及场致发射电子注的通过率,得到不同图形发射效率随网孔尺寸变化的规律。进一步横向对比,得出栅网最佳图形为六边形的结论,其最大电子注通过率为75%。

Carbon nanotube is an ideal cold cathode material because of its good field emission characteristics. In order to develop field-emission carbon nanotube cold cathode devices, the characteristics of three kinds of mesh grid structures on carbon nanotube cold cathodes are simulated by using three-dimensional PIC simulation software. The properties of hexagon mesh, triangle mesh, and square mesh are investigated by calculating the electric-field distribution on the surface of cold cathode and field emission beam current pass rate. Simulation results show that the hexagon mesh characteristics is the best. The optimal mesh size of hexagon mesh is obtained and the maximum current pass rate is 75%.