Khashayar Ghaffari
Ansys Employee

Hi,

Thank you for your question. You are probably looking at the CHARGE monitor which allows you to export charge in .mat format (and not import it).

To introduce additional charge carriers in addition to the bulk material, you would need to use doping objects. Below is a video that provides more information about doping objects in CHARGE in more detail:

https://optics.ansys.com/hc/en-us/articles/360045466973-Simulation-Objects-Doping

Best regards,

Khash