• Schultz, C.; Farias-Basulto, G.; Schmidt, D.; Fenske, M.; Dagar, J.; Bartelt, A.; Schlatmann, R.; Unger, E.; Stegemann, B.: Series Interconnection of Monolithic 2-Terminal CIGSe-Perovskite Tandem Cells: Development of a Novel Interconnection Scheme and Laser-based Patterning Processes. In: 48th IEEE Photovoltaic Specialists Conference, PVSC 2021 : Fort Lauderdale, Florida, USA, 20 – 25 June 2021, onlinePiscataway, NJ: IEEE, 2021. - ISBN 978-1-6654-3018-0, p. 2539-2543


Perovskite and CIGSe are suitable partners for tandem solar cells, since the bandgap energies of both materials can be precisely adjusted. The fabrication of series-interconnected CIGSe-perovskite tandem solar cells requires a re-design of the series interconnection scheme for single junction cells and the development of the corresponding laser parameters for patterning. In this contribution, we present such a concept based on the evolution of the standard P1-P3 patterning design to a four-scribe line scheme by adding an additional isolation-cut (iso-cut) to separate the conductive intermediate window layer stack. To realize this interconnection scheme, laser-based processes for each individual patterning step were developed and suitable process windows were identified and evaluated.