Obtention of solar cell parameters, through convergence of iterative cycles. Part 1: Theoretical analysis and cycles proposal

In this Part 1 of this series of articles, two iterative cycles are proposed to accurately determine the shunt resistance ([Formula: see text]), the series resistance ([Formula: see text]), the ideality factor (n), the light current ([Formula: see text]), and the saturation current ([Formula: see text]) of solar cells, within the one diode model. First, [Formula: see text] and n are obtained linearly fitting [Formula: see text] vs. [Formula: see text] , where [Formula: see text] is a new defined current [Formula: see text]. Then, [Formula: see text] and [Formula: see text] are obtained using Procedure A and B proposed in [2]. Once these four solar cell parameters are obtained, a correction to [Formula: see text] is deduced and applied. The deduction of these five solar cell parameters is reused to recalculate [Formula: see text] and the iterative cycles are redone till some convergence criteria is achieved. The accuracy and number of cycles necessary to achieve reasonable results are tested and discussed on ideal (noiseless) current voltage (IV) curves with measured points per voltage of [Formula: see text] , 21, 51 and 101 [Formula: see text]. These two cycles are compared with two different common parameter extraction methods. The results given in this Part 1 are used in Part 2 to calculate the five solar cell parameters of IV curves found in the literature.