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
_S
I and fit numerically the expression of the current I as a function of x to the simulated data.