»Katana« project aims to improve measurement of tandem solar cells

A project consortium led by the German Fraunhofer Institute for Solar Energy Systems ISE is developing methods for characterizing perovskite-based tandem modules in the »Katana« project funded by the German Federal Ministry for Economic Affairs and Climate.
In contrast to classical modules, the efficiency of perovskite tandem modules cannot be easily determined using flasher from silicon photovoltaics. Martin Schubert, head of the project at Fraunhofer ISE, explains, »All cell layers must be irradiated by different light sources under conditions that imitate – as exact as possible – those under in sunlight in order to make reliable statements about the efficiency of the entire cell and module.« For the metastable behavior of the perovskite technology, the solar cells must also be tested under continuous light. The solar simulator specially built for this purpose by the company Wavelabs Solar Metrology Systems GmbH is now in use at the research institute’s CalLab PV Modules.
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