Applications of the green's expression for saturation current vs. bandgap in Si and CIGS solar cells

Two applications of the Green's expression for saturation current vs. bandgap are proposed. The first one aims at assessing the energy bandgap, Eg, in the quasi-neutral regions (QNR) of Si and CIGS solar cells, which is associated to the saturation current in those regions, J0,QNR. Values for J0,QNR are obtained from both fits to pseudo-dark I-V curves and the textbook expression for open-circuit voltage. The second application deals with detecting the recombination mechanism prevailing in the QNR of CIGS solar cells from the order of magnitude of the value that must be assigned to a parameter of the Green's expression to fit measured curves of performance data vs. Eg. The data utilized in the two applications are both original and taken from the literature.