<p>Fraunhofer FEP is developing new optically effective surface structures for perovskite solar cells using roll-to-roll nanoimprint lithography (NIL) to minimize reflection losses and increase efficiency. The project Design-PV aims to integrate PV-active facade areas with non-active surfaces seamlessly. NIL technology is also being explored for applications in antifouling, anti-reflective coatings, and medical engineering.</p><p>The project PERSEUS is focused on improving the performance of perovskite solar cells with innovative methods, including optimized surface structures. Fraunhofer FEP is working on cost-effective production of these structures using R2R-NIL, targeting indoor and outdoor photovoltaic module applications.</p><p>NIL is capable of fabricating surface topographies on polymer films for large-scale production. The technology offers flexibility to integrate various pigments or particles into coatings, and is being developed for applications beyond photovoltaics, such as lab-on-chip structures and battery electrode substrates.</p>