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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 28: Poster III

CPP 28.41: Poster

Wednesday, March 20, 2024, 11:30–13:30, Poster C

Monolithic series interconnection of perovskite CIGSe tandem modules by laser patterning: Process development and material characterization — •Nicolas Otto¹, Christof Schultz¹, Guillermo Farias-Basulto², Oliver Fischer³, Rutger Schlatmann^1,2, Eva Unger⁴, and Bert Stegemann¹ — ¹HTW Berlin - University of Applied Sciences, Wilhelminenhofstr. 75a, D-12459 Berlin, Germany — ²PVcomB / Helmholtz-Zentrum Berlin für Materialien und Energie, Schwarzschildstr.3, D-12489 Berlin, Germany — ³Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstr. 2, 79110 Freiburg, Germany — ⁴Helmholtz-Zentrum Berlin für Materialien und Energie, Young Investigator Group Hybrid Materials Formation and Scaling, Kekuléstraße 5, D-12489 Berlin, Germany

Perovskite and chalcopyrite based solar cells for 2-T tandem devices enables efficiencies beyond the SQ limit for single junction cells. Both materials can be electrically interconnected by monolithic series interconnection, which comprises alternating layer deposition and layer patterning steps (P1, Isocut, P2, and P3). The goal is to develop suitable patterning parameters for each of the four scribe lines by systematic variation of the laser fluence. Suitable process windows were determined by analyzing the electrical functionality of the scribe lines, their geometry (using laser-scanning microscopy), and photo-activity (using intensity dependent photoluminescence imaging of the individual subcells) as well as alterations in the material composition in the scribe line vicinities (using energy-dispersive x-ray spectroscopy, EDX).

Keywords: Tandem; CIGSe; Perovskite; Laser patterning; Module