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In this work, we present three new Mathematica  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 Iph, a reverse saturation current Is, an ideality factor n, a shunt resistance RSH and a series resistance RS. The three codes are based on the following methods: the five points method , the Ortiz-conde method  and a new method developed in our laboratory, where we determine experimentally the value of series resistance RS, define a new variable x = V - RSI and fit numerically the expression of the current I as a function of x to the simulated data.
Date of Conference: 10-13 May 2009