CHARGE: Setting boundary conditions for 2 objects at once

    • Itamar Priel

      I'm attempting to simulate an avalance photodiode, with a similar geometery to the one in the example:

      However, i wish to simulate both the left AND right metallic contacts of the photodiode, as they are both acting as the P side contact (ilustrated in image below). 
      From what i've understood, the easiest way to do so would be to set the applied boundary condition to the domain of the contacts (for both the P & N contacts).
      Unfortunatly, i can't figure out how to assign the domains to the materials, or apply the boundary condidion to 2 domains at once. Alternatively, i'd like to assign the boundary conditions to the materials themselves, but the option is greyed out, and the only explanation i managed to find is "material:material boundary condition is only available in some boundary conditions" - but no specification under which boundary conditions it's available.
      I'd really appreciate any help on the matter.

      illustration on what i'm trying to do: 
      Set both N contacts (marked V+) to 0v, and sweep the voltage on both P contacts (marked V-) simultaneously, meaning that the voltage on both sides would be set to 0V, 0.1V, 0.2V, (while maintaining 0V on the N contact).






    • Khashayar Ghaffari
      Ansys Employee


      Thank you for reaching out. In the example you linked, we include 3 metal geometries (the contacts) and 3 corresponding boundary conditions (named collector, emitterleft, and emitterright). However the simulation region includes half of the geometry so it excludes one of the contacts. You shold be able to follow the same format as in the example and only adjust the simulation region span (in x direction) so all contacts are included.

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