$3.$ A Si solar cell with a dark saturation current of $5$ nA is illuminated in such a way that the shortcircuit current is $300$ mA $.$ Plot the I$-$V dependence. Then, consider the same solar cell with a series resistance of $\backslash (3\mathrm{.}0\backslash$Omega $\backslash )($which would reduce the cell voltage by the corresponding IR drop$)$ and re$-$plot the I$-$V dependence. Will the fill factor FF change and how? Use Matlab $($preferably$)$ or Excel for all plots.