Regensburg 2013 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 23: Focus Session: Thin Film Photovoltaic Materials and Solar Cells II
DS 23.11: Vortrag
Mittwoch, 13. März 2013, 17:30–17:45, H8
Laser Patterning of CIGS absorber layers with short nanosecond laser pulses — •Manuel Schüle1, Christof Schultz1, Kamil Stelmaszczyk1, Moshe Weizman1, Holger Rhein2, Björn Rau2, Rutger Schlatmann1,2, Volker Quaschning1, Bert Stegemann1, and Frank Fink1 — 1HTW Berlin - University of Applied Sciences, Wilhelminenhofstr. 75a, 12459 Berlin, Germany — 2PVcomB / Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Schwarzschildstr. 3, D-12489 Berlin, Germany
Laser based patterning of chalcopyrite thin film solar cells is an essential step towards high efficiencies since the dead area of the solar module is reduced. When manufacturing solar modules, the second laser patterning step typically comprises the removal of very fine lines in the absorber material by ultra-short laser pulses in order to create a direct contact between the back contact of one cell and the front contact of the adjacent cell. Such ultra-short ps or fs laser pulses are necessary to avoid melting of the absorber which might create a binary conductive phase and thereby shunts in the solar cell. In our study we demonstrate successful laser patterning by using a low-cost nanosecond laser source (532 nm) for local phase transformation of the absorber material instead of removing the material. This patterning step is performed after complete deposition of all layers through the front contact allowing for a simplified and accelerated manufacturing process.