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Michl B.,Fraunhofer Institute For Solare Energiesysteme Heidenhofstr 2 79110 Freiburg Germany | Impera D.,Fraunhofer Institute For Solare Energiesysteme Heidenhofstr 2 79110 Freiburg Germany | Bivour M.,Fraunhofer Institute For Solare Energiesysteme Heidenhofstr 2 79110 Freiburg Germany | Warta W.,Fraunhofer Institute For Solare Energiesysteme Heidenhofstr 2 79110 Freiburg Germany | Schubert M.C.,Fraunhofer Institute For Solare Energiesysteme Heidenhofstr 2 79110 Freiburg Germany
Progress in Photovoltaics: Research and Applications | Year: 2012

We show the benefits of spatially resolved pseudo fill factor analysis on multicrystalline silicon solar cells. Hereby, we present a method based on quasi-steady-state photoluminescence-calibrated photoluminescence images at varying generation rate. We verify the method by a comparison with global and local Suns-V oc measurements and apply Suns-PLI to multicrystalline heterojunction samples with and without conductive top layer, the latter being not accessible by Suns-V oc. Thereby, we obtain detailed insight into the influence of injection-dependent local recombination on fill factor and of losses only due to recombination-driven lateral balancing currents. The conclusions are supported by Spice network simulations. © 2012 John Wiley & Sons, Ltd.

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