POTENTIAL BARRIER ESTIMATION WITH A GRAPHICAL METHOD

In this work, a representative graphical method was used to estimate the potential barrier at grain boundaries in polycrystalline materials. The used equation for the determination of trapping density states is closely related to the doping concentration in the layer. The obtained results showed that this density is a crucial parameter for estimating the maximum barrier value. This parameter strongly depends on the grain size and, consequently, on the grain boundary width. The conduction (or transport) properties represented by the thermionic current and the effective mobility also prove this dependence. Also, the obtained results are in good agreement with the experientially measured values from previous works.