Continuity/Heterojunction
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.
Continuation Settings
These settings are the same as for Fletcher Mobility Model (C).
The Continuation Settings do not scale the equation contributions for the Continuous Quasi-Fermi level option.
Heterojunction
Select a Continuity modelContinuous 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.
Extra Current Contribution
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 drop-down menu:
1
No extra current (the default)
2
WKB tunneling model Computes the extra current contribution using the WKB approximation for tunneling. For this option to work, the user needs to manually add a WKB Tunneling Model, Electrons subnode to specify the tunneling parameters.
3
User-defined extra current fraction Computes the extra current contribution using the user-defined extra current fraction entered into the input field Extra current fraction, electrons that appears when this option is selected.
Select an option for the Extra hole current drop-down menu, 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.