Theoretical investigation of the stoichiometric dependence of the field emission from Al/sub x/Ga/sub 1-x/N

The field emission current density j from Al/sub x/Ga/sub 1-x/N is calculated as a function of stoichiometry. Using the reported x-dependence of the electron affinity /spl chi/ and the carrier concentration n, we calculate j as a function of x only. The plot of j versus x is found to exhibit a peak whose position changes with an external field F.