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HL: Fachverband Halbleiterphysik

HL 55: Photovoltaics: mainly Technology and Photon Management

HL 55.9: Talk

Wednesday, March 16, 2011, 16:45–17:00, FOE Anorg

From Point to the Line: The Incubation Effect during Laser Scribing of Silicon Thin-Film Photovoltaic Modules — •Michael Richter¹, Christof Schultz¹, Frank Fink¹, Volker Quaschning¹, Bert Stegemann¹, Hans-Ulrich Pahl², Heinrich Endert², and Bernd Stannowski³ — ¹Hochschule für Technik und Wirtschaft Berlin, Wilhelminenhofstr. 75a, 12459 Berlin, Germany — ²Newport Spectra-Physics GmbH, Ruhlsdorfer Strasse 95, 14532 Stahnsdorf, Germany — ³PVcomB - Kompetenzzentrum Dünnschicht- und Nanotechnologie für Photovoltaik Berlin, Schwarzschildstr. 3, 12489 Berlin, Germany

Serial interconnection of thin film solar cells by laser ablation requires precise and layer-selective scribing of narrow grooves. We have determined the ablation energy fluence thresholds by variation of spot overlap and laser fluence for different photovoltaic materials used for silicon based thin-film solar cells and derived the respective incubation coefficients as a function of the laser pulse duration. The results provide a detailed description of the incubation behavior and allow an accurate prediction of the specific laser scribing results. Moreover, we found good agreement between experiment and theoretical estimations.