Unified analysis of the bulk unipolar diode

A generalized model of the bulk unipolar diode (BUD) is analysed which allows for a direct comparison between the special cases of the Camel diode, the triangular barrier (TB) or planar doped barrier (PDB), and the p-plane barrier. The latter forms have been discussed separately in the literature but as yet no comparison has been made. Closed-form expressions for the functional dependence of the barrier heights on the applied voltage are obtained.