Surface recombination boundary condition in charge?

- September 25, 2023 at 12:19 pm
  
  Mariah Ha
  Subscriber
  
  Hi,
  I am simulating a pin diode in Charge. I am using the electrical boundary condition to apply a voltage at the anode and at the cathode. Is it mandtory to add a surface recombination boundary condition between Si/Al and between the other materials , for example Glass/Si ...or is it optional? I am asking because if I add these surface recombination velocities boundary conditions, I get a warning when I check the simulation (check button) mentioning that there are duplicate surfaces for boundary conditions.
  Regards.
- September 25, 2023 at 6:53 pm
  
  Guilin Sun
  Ansys Employee
  
  No. Usually the surface recombiation is set in the material property.
  https://optics.ansys.com/hc/en-us/articles/360034404814-addsurfacerecombinationbc-Script-command
  I case you need to set, please unceck "apply to majority carriers" and the parameter values should be proper.
  Simulation Objects - Boundary Conditions
  2D silicon square grating solar cell
- September 25, 2023 at 7:20 pm
  
  Mariah Ha
  Subscriber
  
  Thank you for the prompt answer. When should i use the surface recombination boudary conditions if it is already set in the material ?

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