The Continuity/Heterojunction node is added by default to all interior boundaries in a model. When the material properties are continuous across the boundary the feature has no effect. If there is a discontinuity in the material properties across the boundary then the feature includes the equations required to model a heterojunction.

These settings are the same as for Fletcher Mobility Model (C).

Select a Continuity model — Continuous quasi-Fermi levels (the default), Thermionic emission, or User-defined junction current. The Continuous quasi-Fermi levels model enforces continuity of both quasi-Fermi levels at the boundary. The Thermionic emission model adds thermionic emission of the carriers over the boundary to the model. The User-defined junction current option allows the user to specify the normal electron and hole current densities across the heterojunction.

This section appears if the Continuity model is set to Thermionic emission (See the section Heterojunction above).

Select an option for the Extra electron current list:

Select an option for the Extra hole current list, which has a set of options analogous to the ones for electrons described above. For the option WKB tunneling model to work, remember to add a WKB Tunneling Model, Holes subnode.