Solar cell parameter accuracy improvement, via refinement of the Co-Content function. Part 1: theoretical analysis

Abstract In this Part 1 of this series of articles, the accuracy on the obtention of the shunt resistance ( R sh ), the series resistance ( R s ), the ideality factor ( n ), the light current ( I lig ), and the saturation current ( I sat ), via the use of the Co-content function CCV,I=∫0VI−IscdV (where Isc=IV=0 ) is investigated theoretically, as function of the number of measured points per voltage ( PV ) and percentage noise ( pn ). Reasonable values are obtained for R sh , R s , and I lig , with PV = 11 measurement points per V if the pn is 0.1% or less. For a reasonable determinatio n of n at least PV = 101 measurement points per V are needed. I sat determination requires pn of 0.01% or lower with at least PV = 101 measured points per V and should be evaluated at large values of V. The results given in this Part 1 are used in Part 2 to discuss the reported application of the CCV,I to obtai n R sh , R s , n , I lig , and I sat found in the literature.