Are there free tools to extract the equivalent circuit solar cell parameters (lph, Rs, I01, I02, Rsh, n1, n2) from the dark/illuminated current-voltage curve?
Del Pozo, G., Beatriz Romero, and B. Arredondo. "Evolution with annealing of solar cell parameters modeling the S-shape of the current–voltage characteristic." Solar Energy Materials and Solar Cells 104 (2012): 81-86.