Berlin 2012 – scientific programme

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DS: Fachverband Dünne Schichten

DS 8: Thin film photovoltaics: oxides and nanostructures

DS 8.6: Talk

Monday, March 26, 2012, 17:45–18:00, H 2032

Ultra-short laser pulse structuring of thin zinc oxide layers on 30 cm x 30 cm CIS solar cell modules — •Christian Miller, Daniel Harangozo, Juergen Sotrop, Gerhard Heise, and Heinz Huber — Hochschule München, Laserzentrum, Lothstr. 34, 80335 München, Deutschland

In order to avoid resistive losses and for voltage transformation thin film solar cells must be separated into serially connected sub cells. In the case of CIS thin film solar cells the interconnection is performed in industry by ns-laser structuring and mechanical scribing, to separate the Molybdenum p-contact as well as the CIS-absorber and the Zink oxide n-contact, respectively. In contrast, ps-laser enables selective structuring of a specific layer, reducing the damage of the subjacent layer. For this purpose, we demonstrate an all-pico-second-laser process on 30 cm x 30 cm samples. Module efficiencies of 11.8 % where achieved reducing the width of the interconnection down to about 150 um.