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Optimization of multi-layer metallization design for large-area back-contact back-junction solar cells

: Hendrichs, M.; Keding, R.; Spribille, A.; Fellmeth, T.; Nold, S.; Clement, F.; Wolf, A.; Biro, D.; Preu, R.

Volltext urn:nbn:de:0011-n-3112798 (262 KByte PDF)
MD5 Fingerprint: 87cc56c56d83c44a55d4934c56058272
Erstellt am: 7.11.2014

Bokhoven, T.P. ; European Commission:
29th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2014 : Proceedings of the international conference held in Amsterdam, The Netherlands, 22 - 26 September 2014, DVD
München: WIP, 2014
ISBN: 3-936338-34-5
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <29, 2014, Amsterdam>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()
PV Produktionstechnologie und Qualitätssicherung; Silicium-Photovoltaik; Messtechnik und Produktionskontrolle; contact; reduction; metallization; modelling; cell

In this study, a multi-layer metallization concept for high-efficient large-area silicon back-contact back-junction solar cells is investigated. The metallization approach represents an industrial alternative to the well-known edge-to-edge cell interconnection technology, allowing for a decoupling of the cell metallization from the external contact structure by inserting an intermediate insulation layer. A first proof of principle is shown for an n type back-contact back-junction solar cell with an edge length of 156 mm and evaporated aluminum grid fingers. Furthermore, we present a tool that allows for the design optimization of the contact layout by combining detailed cost of ownership calculations with analytical solar cell simulations. Two back-end process sequences are compared and for both approaches the most cost-effective metallization layout is determined on cell level. Finally, a sensitivity analysis is carried out, revealing the high potential of the investigated back-contact back junction solar cell structures.