Perturbation Theory for Solar Cell Efficiency II—Delineating Series Resistance

Recently proposed perturbation analysis and reciprocity relations in photovoltaic conversion are demonstrated in 2-D simulations. The main parameters discussed are the current-conversion efficiency, which enables accurate calculation of the sensitivity of maximum power to different recombination parameters, and its derived local series resistance, whose weighted average is exactly equal to the series resistance obtained by the double illumination method. Both parameters can be displayed as spatial maps to visually aid multidimensional computer simulations. Finally, the suitability of mapping the local series resistance from luminescence images is discussed with the help of simulated examples. The experimental and computational procedures to generate these maps are among the easiest proposed so far in the literature and require no ad hoc assumptions.