Modeling and comparisons of field emitter devices with variable geometries

We report different geometries of gated field emitter devices and their simulation results. Each geometry is defined as tip-on-post, flat cathode and bottle-neck separately. We report the optimized tip height and width of tip-on-post with best high emission current. The electric field calculation, and emission current are compared at different aspect ratios of tip-on-post cathode. Flat cathode with gate electrode demonstrates the feasibility of diamond thin film application for triode geometry with less leakage current. The calculation of electric field of flat cathode is determined by variable geometrical parameters. In this simulation, the feasibility of bottle neck field emission cathode is reported.