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Determination of solar cell parameters: an analytical approach

An analytical approach to determine the solar cell series resistance (Rs), dark saturation current due to diffusion of charge carriers (I01), and dark saturation current due to generation/recombination of charge carriers in the space charge region (I02), from the double-diode solar cell equation is presented. The theory uses the measured Isc, Voc, Vmp and Imp data of the cell. The results confirm that the diffusion process dominates charge transport at high forward bias voltages of the cell, whilst the generation/recombination process dominates charge transport at low forward bias voltages. Theoretical and experimental I-V characteristics match within +or-2%, which confirms the adequacy of the theory.