Illuminated solar cell physical parameters extraction using mathematica

In this work, we present three new Mathematica [1] codes written to extract physical parameters of illuminated solar cell from its current-voltage characteristic. The solar cell is modelled by a circuit containing a p-n junction photocurrent I_ph, a reverse saturation current I_s, an ideality factor n, a shunt resistance R_SH and a series resistance R_S. The three codes are based on the following methods: the five points method [2], the Ortiz-conde method [3] and a new method developed in our laboratory, where we determine experimentally the value of series resistance R_S, define a new variable x = V - R_SI and fit numerically the expression of the current I as a function of x to the simulated data.