CC BY 4.0 UnportedRingleb, FranziskaAndree, StefanHeidmann, BeritBonse, JörnEylers, KatharinaErnst, OwenBoeck, TorstenSchmid, MartinaKrüger, Jörg2023-01-272023-01-272018https://oa.tib.eu/renate/handle/123456789/11118http://dx.doi.org/10.34657/10144Micro-concentrator solar cells offer an attractive way to further enhance the efficiency of planar-cell technologies while saving absorber material. Here, two laser-based bottom-up processes for the fabrication of regular arrays of CuInSe2 and Cu(In,Ga)Se2 microabsorber islands are presented, namely one approach based on nucleation and one based on laser-induced forward transfer. Additionally, a procedure for processing these microabsorbers to functioning micro solar cells connected in parallel is demonstrated. The resulting cells show up to 2.9% efficiency and a significant efficiency enhancement under concentrated illumination.enghttps://creativecommons.org/licenses/by/4.0620540ChalcopyriteFemtosecond laser patterningLaser-induced forward transferMicro-concentrator solar cellPhotovoltaicsArticle