An improved self-consistent fitting model for characterizing field emitters

We propose a new fitting model for better characterizing field emitters such as a field emission array (FEA) that may be operated at high current density. In this improved model, we employ both effective work function and effective enhancement factor approximations. The experimental data can be fitted perfectly and therefore the discrepancy between the experimental results of FEA at high current density and FN theory can be explained. It indicates the space charge effects play the key role.