Search the effect of Poole-Frenkel or emission enhancement by Poole-Frenkel effect.

Hello Tom,

a direct ionization is possible, if the electric field E is able to exceed the ionization energy EI of a atom over the diameter d of an atom, e.g. e*E*d> EI (bold - vector). In a metal you have bands and EI must be substituted by the work function W (field emission by an electric field)..

More probably, you ionize by impact ionisation, if a charged carrier is accelerated by an electric field. Here the acceleration length depends on the mean free path l (distance between two collisions of the carrier with phonons, impurities or other excitations). In this case the relation e*E*l > W is important.

With Regard

R. Mitdank

Thank you both for your answers, Rüdiger Mitdank and Andrey. P. Odrinsky !

With your help i found this paper:

Article Poole-Frenkel electron emission from the traps in AlGaN/GaN ...

with an equation i might be able to work with.

Thanks again!

Kind regards,

Tom Becker