Berlin 2024 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 16: Crystal Structure Defects / Real Structure / Microstructure I

KFM 16.2: Vortrag

Mittwoch, 20. März 2024, 15:20–15:40, E 124

Laser-assisted formation of local defined absorbers for Cu(In,Ga)Se2-micro-concentrator solar cells — •Setareh Zahedi Azad¹, Owen.C. Ernst¹, Torsten Boeck¹, Heike Voß², Sonja Cinque², Jörn Bonse², Jörg Krüger², Jan Lucaßen³, Martina Schmid³, and Jens Martin¹ — ¹Leibniz-Institut für Kristallzüchtung (IKZ), Berlin, 12489, Germany — ²Bundesanstalt für Materialforschung und -prüfung, Unter den Eichen 87, 12205 Berlin, Germany — ³Universität Duisburg-Essen, Forsthausweg 2, 47057 Duisburg, Germany

The micro-concentrator design for high-performance Cu(In,Ga)Se2 (CIGSe) solar cells is a promising approach to reduce the consumption of Indium and Gallium [1]. To save these rare materials, the local nucleation of (In,Ga)-islands at a micrometre scale is investigated. Our results show that the selective formation of an array of indium and gallium islands on Mo-coated soda-lime glass substrates is possible using localized laser-heating by a cw-laser, a diffractive optical element (DOE), and the use of trimethylindium and triethylgallium as precursors. The results indicate that nucleation is dependent on the laser power and the roughness of Molybdenum. By evaporation of Copper in a PVD chamber followed by selenization, the (In,Ga)-islands turn to CIGSe-islands serving as absorbers for micro-concentrator solar cells. Since the size and pattern of the CIGSe-islands can be easily controlled using the laser-heating/DOE-setup, this novel method can also be applied to large-scale production. [1] Sadewasser, S., Solar Energy 158 (2017): 186-191.

Keywords: Laser-assisted nucleation; formation of (In,Ga)-islands; micro-concentrator solar cells