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MM: Fachverband Metall- und Materialphysik

MM 26: Microstructure and Phase Transformations

MM 26.2: Talk

Tuesday, March 13, 2018, 12:00–12:15, TC 010

Surface preparation by laser treatment for liquid phase epitaxy — •David Uebel, Roman Bansen, Christian Ehlers, Thomas Teubner, and Torsten Boeck — Leibniz-Institut für Kristallzüchtung

Bulk-based silicon solar cells consume much more raw silicon than electrically necessary. Therefore we grow crystalline silicon on glass just to the necessary thickness in a two-step process. First, amorphous silicon is applied by PVD to form a seed layer. Afterwards, a polycrystalline layer is deposited from a tin solution, supersaturated with silicon. To improve the growth on the seed, it is treated by a pulsed UV-laser directly before growth. Areal scanning heats up the surface and disruptive silicon oxides react with the chamber atmosphere. We will present a detailed model of the interaction process.