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Correlations between finger geometry and dispensing paste rheology

: Pospischil, M.; Specht, J.; Gentischer, H.; König, M.; Hoerteis, M.; Mohr, C.; Zengerle, R.; Clement, F.; Biro, D.

Fulltext urn:nbn:de:0011-n-2365606 (257 KByte PDF)
MD5 Fingerprint: 2a0739c8fffe8b7173529993ee6d0d16
Created on: 12.4.2013

Nowak, S. ; European Commission:
27th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2012. DVD-ROM : Proceedings of the international conference held in Frankfurt, Germany, 24 - 28 September 2012
München: WIP-Renewable Energies, 2012
ISBN: 3-936338-28-0
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <27, 2012, Frankfurt>
Conference Paper, Electronic Publication
Fraunhofer ISE ()
PV Produktionstechnologie und Qualitätssicherung; Silicium-Photovoltaik; Industrielle und neuartige Solarzellenstrukturen

An optimum adjustment of printing medium and machine parameters is essential to establish dispensing as an alternative front side metallization process for silicon solar cells. In previous studies [1-3], paste rheology was found to have a major impact on resulting finger geometry and process stability. In order to find a good balance between printability and resulting contact geometry, different dispensing pastes were evaluated and dispensed on Cz–Si 156x156 mm² precursor material equipped with standard aluminium printed back surfaces and pre-printed front side busbars. In order to determine the optimum co-firing temperature, three completely screenprinted cell groups were processed in parallel serving as reference cells. Cell results were investigated concerning finger geometry and electrical parameters. With increasing paste elasticity, the finger width could be reduced down to 43 ?m. Furthermore, contact width indicating possible paste spreading on the wafer surface as well as finger necking turned out to be a crucial geometrical parameter of dispensed contact fingers. Once more, the enormous potential of dispensing as a front side metallization technique could be demonstrated.