Study on nanocrystalline silicon planar cathodes with low emission divergence and narrow electron energy spread

研究了脉冲Nd：YAG激光烧蚀制备的nc-Si平板阴极的发射均匀性。电子发射的分布表现出强烈的依赖于薄金属形态。由于串联电阻效应，不连续金属阴极的发射区仅限于局部，而连续金属阴极的发射区则全部发生。金属薄膜的连续性和导电性对于平面阴极的均匀和高方向性发射是重要的。

We investigated emission uniformity from the planar cathodes based on nc-Si prepared by pulsed Nd : YAG laser ablation. Distributions of electron emission showed strong dependence on thin metal morphology. The emission occurred at limited parts of the emission area for the cathode with discontinuous metal and the whole for the cathode with continuous metal due to series resistance effects. Continuity and conductivity of thin metal film are important for uniform and high directional emission from the planar cathodes.