FK 06 Fakultät für angewandte Naturwissenschaften und Mechatronik
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Institute
CIS (Cu(In,Ga)(S,Se)2) thin film solar cells show a high potential to achieve the efficiencies of Si wafer-based solar cells. The commonly applied patterning processes for the integrated interconnects are based on nanosecond laser ablation and mechanical scribing. Both methods introduce damages on the thin films by thermal effects and mechanical forces. By picosecond laser processing we realized all three patterning steps to the monolithic thin films CIS modules, namely the separation of the molybdenum back electrode, the absorber and the ZnO font electrode (P1, P2 and P3 respectively). We achieved an efficiency of 14.7% for 300 x 300 mm² modules.
A picosecond laser lift-off process of an about 0.5 μm thick Mo layer on a glass substrate can be induced by irradiating the layer from the glass side. A pump-probe setup for time- and space resolved microscopy is used to investigate the ablation process in a time domain from a few picoseconds up to 3.6 ns. The results display a bulging of Mo within 1 ns followed by a lift-off at times past 3.6 ns. Furthermore, the setup is used for in situ investigations of a multi pulse ablation through the whole layer stack (ZnO/CIS/Mo/Glass) of a CIS thin film solar cell.
Diese Vorlesung entstand aus dem Wunsch der Studenten heraus, einzelne Gebiete der Physik nach dem Absolvieren des Grundkurses Quantenphysik genauer zu durchleuchten. Dabei konnten die Studenten aus einem Gebietskanon auswählen. So ist zu erklären, dass nicht nur Themen der Quantenmechanik enthalten sind, sondern auch elementare Abschnitte über Schwingungen und Wellen sowie Dipole und die elektromagnetische Masse.