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Laser Metal Bonding (LMB) - low impact joining of thin aluminum foil to silicon and silicon nitride surfaces

: John, O.; Paschen, J.; Rose, Angela de; Steinhauser, B.; Emanuel, G.; Brand, A.A.; Nekarda, J.

Volltext ()

Procedia CIRP 94 (2020), S.863-868
ISSN: 2212-8271
Conference on Photonic Technologies (LANE) <11, 2020, Online>
Zeitschriftenaufsatz, Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()
Photovoltaik; Silicium-Photovoltaik; Metallisierung und Strukturierung; aluminium; Solar; cell; bond; foil

We present the design, implementation and optimization of laser metal bonding (LMB), a new approach for joining thin aluminum foils and back surfaces of solar cells with a focus on low impact on the semiconductor and good adhesion. After gaining deep insights into laser-material interaction using finite difference simulations, we succeeded in establishing an expulsion free laser process that can be tuned from non-ablative bonding, which leaves the substrate largely intact, to welding, which produces highly adhesive joints. Experiments were conducted on a number of substrates, showing the correlation between damage and adhesion at different process parameters.