For any materials that are not in the material database, you can add them to be semiconductor, metal or insulator.
Please refer to
Material Database in Finite Element IDE (CHARGE, HEAT, DGTD, FEEM, MQW)
Creating and modifying electrical materials from a script
addmodelmaterial - Script command
Tips for creating a new alloy material
Tips for creating a new semiconductor material
Metals (conductors) are simple as they only need to know its work function.
If you want to simulate it as semiconductor, you will need to have some semicondutor properties for it.
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