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Characterization of aluminium screen-printed local contacts

: Grasso, F.S.; Gautero, L.; Rentsch, J.; Preu, R.; Lanzafame, R.

Volltext urn:nbn:de:0011-n-2095789 (371 KByte PDF)
MD5 Fingerprint: 9576ed2c9c9ffe624be0dca12fa4b6a0
Erstellt am: 3.8.2012

Hörteis, M.:
2nd Workshop on Metallization for Crystalline Silicon Solar Cells 2010. Proceedings : Status, trends and new directions. April 14th & 15th, 2010, Constance, Germany
Konstanz: Universität Konstanz, 2010
ISBN: 978-3-89318-058-5
Workshop on Metallization for Crystalline Silicon Solar Cells <2, 2010, Constance>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()
PV Produktionstechnologie und Qualitätssicherung; Silicium-Photovoltaik; Kontaktierung und Strukturierung; Pilotherstellung von industrienahen Solarzellen; Industrielle und neuartige Solarzellenstrukturen

The formation of a Back Surface Field (BSF) during the alloying of a screen-printed aluminium paste with the silicon substrate is a critical step for the performance of solar cells. In this study, wafers with a locally contacted structure at the back side are investigated with Scanning Electron Microscope (SEM). An industrially feasible contacting technique is considered and a variation of the contact structure has been investigated. Moreover, a variation in the amount of screen-printed paste is proposed. Additionally, the effect of the crystallographic orientation of the grains on the electrical contacts is evaluated by investigating both mc and FZ samples. In conclusion, a model of the local contact formation is proposed. The understanding of the alloying dynamics allows the adaptation of the process in order to control the formation of the BSF layer.