Guilin Sun
Ansys Employee

the CHARGE solver does not include  Fowler Nordheim tunneling effect. Please file a feature request: 

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CHARGE needs semicodutor materials. metals are simplied to be PEC which is not included in the simulation. Vacuum is "Insulator" as it is not semicoductor. Insulator does not allow any charger passing. If it is used for tunneling, you may need to modify it into light semicondutor

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