Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 6: Thin film photovoltaics: CIGSe + processing

DS 6.4: Vortrag

Montag, 26. März 2012, 12:00–12:15, H 2032

Influence of the mechanical properties of sputtered Mo solar cell back contacts on laser scribing — Christof Schultz¹, Manuel Schüle¹, Heinrich Endert², •Jörn Bonse⁴, Björn Rau³, Rutger Schlatmann³, Volker Quaschning¹, Bert Stegemann¹, and Frank Fink¹ — ¹University of Applied Science (HTW) Berlin, Wilhelminenhofstr. 75A, 12459 Berlin, Deutschland — ²Newport Spectra-Physics GmbH, Ruhlsdorfer Strasse 95, 14532 Stahnsdorf, Deutschland — ³PVcomB - Competence Centre Thin-Film and Nanotechnology for Photovoltaics Berlin, Schwarzschildstr. 3, 12489 Berlin, Deutschland — ⁴BAM Bundesanstalt für Materialforschung und -prüfung Unter den Eichen 87 12205 Berlin, Deutschland

In thin-film photovoltaics complete laser structuring of the solar modules is aimed to perform appropriate monolithic serial interconnection. We have studied the laser ablation behavior of sputtered molybdenum back contacts for chalcopyrite solar cells. The properties of these Mo layer are sensitive to the sputter conditions. The process pressure influences the mechanical layer properties and, thus, contributes directly to the quality of the laser scribes. Precise, reliable and reproducible laser scribing requires the proper adaptation of the laser parameters to the material properties. In our study it was achieved by comprehensive analysis of the laser matter interaction and by detailed determination of the ablation thresholds as a function of the Mo layer thickness and ductility for different laser wavelengths and pulse durations, accompanied by thermal modeling.