I see this. however, i could not find an equation that explain it. I saw that Is depends on exp(-constant/T), but i plotted it and I could not get a result that gives you this effect. Do you know if I am using the correct equation for Is? I am using the one which is described here https://web.calpoly.edu/~jfernsle/Classes/PHYS452/Labs/452LMExp15W13.pdf