John, OliverOliverJohnPaschen, JanJanPaschenDe Rose, AngelaAngelaDe RoseSteinhauser, BerndBerndSteinhauserEmanuel, GernotGernotEmanuelBrand, Andreas A.Andreas A.BrandNekarda, Jan F.Jan F.Nekarda2022-03-062022-03-062020https://publica.fraunhofer.de/handle/publica/26486810.1016/j.procir.2020.09.1092-s2.0-85093366230We 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.enPhotovoltaikSilicium-PhotovoltaikMetallisierung und StrukturierungaluminiumSolarcellbondfoil621697journal article