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Electrode Design for Wire Interconnected Back Contact Solar Cells

: Spribille, A.; Huyeng, J.D.; Schweigstill, T.; Franzetti, I.; Rendler, L.C.; Clement, F.

Volltext urn:nbn:de:0011-n-5782882 (647 KByte PDF)
MD5 Fingerprint: 5137da0df22427c0e82dd8188d468bf9
Erstellt am: 13.3.2020

36th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2019 : Proceedings of the international conference held in Marseille, France, 09-13 September 2019
Marseille, 2019
ISBN: 3-936338-60-4
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <36, 2019, Marseille>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()
Photovoltaik; Silicium-Photovoltaik; Metallisierung und Strukturierung; back-contact; interconnection

Back contact back junction (BC-BJ) solar cells are a well-studied cell concept for high efficiency silicon solar cells. Wire interconnection is a known approach for the interconnection of solar cells with electrodes on front and rear side but has only recently been investigated in combination with back contact concepts [1]. Here, an optimal electrode design has quite different requirements. This study determines the smallest possible electrode geometry for linear electrodes on BC-BJ solar cells by conducting peel tests on geometry variations. Moreover, it is shown that the reliability of the wire interconnection is improved by implementing an optimized H-shaped pad geometry. Consequently, the H-shape is applied on BC-BJ half-cells and evaluated based on peel force measurements, as well as electroluminescence images of wire interconnected half-cells. A significant increase of peel force from below 0.1 N for linear pads to above 0.3 N for H-shaped pads, as well as a significant decrease of failure rate from 12.5 % for linear pads down to 4.5 % are demonstrated.