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Basic study on the influence of glass composition and Aluminum content on the Ag/Al paste contact formation to boron emitters

: Körner, Stefan; Kiefer, Fabian; Peibst, Robby; Heinemeyer, F.; Krügener, J.; Eberstein, Markus

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Energy Procedia 67 (2015), pp.20–30
ISSN: 1876-6102
Workshop on Metallization for Crystalline Silicon Solar Cells <5, 2014, Constance>
Journal Article, Conference Paper, Electronic Publication
Fraunhofer IKTS ()
n-type solar cell; front side metallization; glass viscosity; aluminum content; in-situ-contact resistance

In this study, the contact formation of aluminum containing silver metallization pastes for boron emitters was investigated. Model pastes with varied glass composition (PbO-containing and PbO-free) and Al content were prepared. It was found, that glass viscosity as well as Al content have a strong influence on densification behavior of the pastes. The most significant effect of the aluminum addition is the change of the thermodynamic conditions in the system silver-glass-silicon. For investigations of the contact formation an in-situ-contact resistance measurement was performed. The interface morphology of the pastes in dependence on the firing temperature was investigated by means of cross section samples in SEM and EDX. Finally, n-type Si solar cells were electrically characterized and the IV-data were correlated to the interface morphology.