Figure 10: Efficiency as a function of illumination intensity for the two most extremely different cases of reverse bias characteristics (see Fig. 6), paired with the two most different photogeneration inhomogeneities used in this study (+/- 0.4% and +/- 2.0%). Average photogeneration is in all cases 40 mA/cm². The efficiency is calculated assuming that inhomogeneity is exclusively due to illumination, and hence both modules receive identical average illumination intensity for all cases from 0.1 Sun to 1 Sun.
The modules of all four different I -V curves in Fig. 9 received the same average photogeneration current density 40 mA/cm², but produced different short-circuit currents I SC. We therefore explore in Fig. 11 how the I SC varies as a function of illumination inhomogeneity and intensity for modules with different cell reverse bias characteristics.