Reply To: InGaAs/InAlAs APD – Unable to reach avalanche breakdown

[Guilin Sun]

Hi Sathursan, sorry to reply you late.

As long as you can simulate to   15.625 mV, it indicates that the settings are good. The reason to breakdown here is likely due to the sharp change of IV curve. eg, the gradient is too large to converge with voltage step size. Please this converged file at  15.625 mV as continuation file, and begin to simulate from here to some other voltage with smaller voltage step size. It may break again before reaching 25V. You will need to repeat this procedure with smaller step size until you reach 25V or close to it.

https://optics.ansys.com/hc/en-us/articles/360034918633-CHARGE-solver-Simulation-object