Analysis of fill factor losses using current-voltage curves obtained under dark and illuminated conditions

Series resistance was determined using illuminated and dark J-V curves for a group of twenty-eight cells. The change in fill factor due to the series resistance power loss was calculated and subtracted from the Suns-Voc-determined fill factor, which represents the fill factor void of series resistance losses. On average, this difference was found to equal the cell fill factor. This agreement indicates the reliability of each of the components involved in the determination. As a result, the fill factor losses due to series resistance using only dark and illuminated J-V measurements are determined with good accuracy. The limitations of this analysis are also discussed.