As I mentioned, there is no difference whatever the semiconductor material you use for simulation of such device. Just follow the examples online to set up your simulation and contact us should you have questions.
https://optics.ansys.com/hc/en-us/articles/6676559298323-SPAD-Secondary-Emission-and-Absorption
https://optics.ansys.com/hc/en-us/articles/18772400259859-SPAD-dark-count-rate-simulation
https://optics.ansys.com/hc/en-us/articles/11910437549203-Optical-crosstalk-in-SPAD-due-to-secondary-emissionÂ
https://optics.ansys.com/hc/en-us/articles/360042331634-10-V-Ge-on-Si-APD-with-Si-multiplicationÂ
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