Regensburg 2016 – scientific programme

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DS: Fachverband Dünne Schichten

DS 12: Postersession DS

DS 12.21: Poster

Monday, March 7, 2016, 17:00–19:00, Poster A

Scribing of CIGS thin film solar cells with 1550 nm nanosecond laser radiation — •Martin Ehrhardt, Klaus Zimmer, Pierre Lorenz, and Lukas Bayer — Leibniz-Institut für Oberflächenmodifizierung e. V., Permoserstraße 15, 04318 Leipzig, Germany

Microstructuring of thin functional films without affecting the functionality is a great challenging for laser-assisted methods. The laser pattering experiments of copper indium gallium selenide (CIGS) solar cells with a 1.55 µm laser source with a pulse length of 6 ns is present. It will be shown that two different material removal processes were found in dependence on the specific laser parameter used. For high laser repetition rate a material ablation starting from the front side of the samples was observe. By using a low laser repetition rate the laser pulse penetrate the CIGS material and were absorbed in the interface between the CIGS and the Mo causing a delamination lift-off process of the CIGS from the Mo back contact. The morphology and size of the resultant pattern were studied by scanning electron microscopy (SEM). The composition of the sample material after the laser treatment was analyzed by energy dispersive X-ray spectroscopy (EDX) and micro Raman spectroscopy. Furthermore, the different removal processes was simulated using finite element method (FEM) where the laser-solid interaction was approximately described by a heat equation.