I am studying perovskite solar cells and I plan to simulate a perovskite cell that will be made in the laboratory. I have no experimental J-V curve for the solar cell.

I am going to use SCAPS device simulator. The question is that, is it necessary to add the values of shunt resistance and series resistance?

If yes, how can I find their true values for my solar cell that was not fabricated before?

Thank you in advance.