A new technique forextracting physical parameters of a solar cell model from the double exponential model (DECM)

Abstract In this paper, we propose and apply a new technique for extracting physical parameters of solar cell double exponential model with two ideality factor constants (DECM) from illuminated current–voltage ( I – V ) experimental characteristics. The equivalent circuit of solar cell includes two constant diodes ideality factors ( n 1 = 1, n 2 = 2) with two saturation currents I 0D and I 0R , a current generator intensity I ph , a series resistor R S and a conductance G P . A set of current–voltage characteristics are generated by injecting various R S values in the characteristic equation. Using the area error rate (“%ΔArea,”) between the experimental and extracted ( I – V ) characteristics, the value of R S is deduced as the minimum of this error. The obtained results show a good agreement with the experimental characteristics measured on a commercial polycrystalline solar cell.