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Microscopic thick film contact formation mechanism to p(p+) Si and influence of the metal contact on the Si substrate - lessons learned from the KONSENS project

Microscopic thick film contact formation mechanism to p(p+) Si and influence of the metal contact on the Si substrate - lessons learned from the KONSENS project

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RIEGEL, Stefanie, Susanne FRITZ, Katharina DRESSLER, Axel HERGUTH, Markus KÖNIG, Matthias HÖRTEIS, Giso HAHN, 2015. Microscopic thick film contact formation mechanism to p(p+) Si and influence of the metal contact on the Si substrate - lessons learned from the KONSENS project. 31st European Photovoltaic Solar Energy Conference and Exhibition. Hamburg, 14. Sep 2015 - 18. Sep 2015. In: 31st European Photovoltaic Solar Energy Conference and Exhibition : proceedings of the international conference held in Hamburg, Germany, 14 September - 18 September 2015. 31st European Photovoltaic Solar Energy Conference and Exhibition. Hamburg, 14. Sep 2015 - 18. Sep 2015. München:WIP, pp. 507-510. ISBN 3-936338-39-6. Available under: doi: 10.4229/EUPVSEC20152015-2DO.4.4

@inproceedings{Riegel2015Micro-34588, title={Microscopic thick film contact formation mechanism to p(p+) Si and influence of the metal contact on the Si substrate - lessons learned from the KONSENS project}, year={2015}, doi={10.4229/EUPVSEC20152015-2DO.4.4}, isbn={3-936338-39-6}, address={München}, publisher={WIP}, booktitle={31st European Photovoltaic Solar Energy Conference and Exhibition : proceedings of the international conference held in Hamburg, Germany, 14 September - 18 September 2015}, pages={507--510}, author={Riegel, Stefanie and Fritz, Susanne and Dressler, Katharina and Herguth, Axel and König, Markus and Hörteis, Matthias and Hahn, Giso} }

eng 2016-06-28T14:31:51Z Riegel, Stefanie Dressler, Katharina Riegel, Stefanie Fritz, Susanne Herguth, Axel Hahn, Giso Dressler, Katharina 2015 Fritz, Susanne Herguth, Axel Hörteis, Matthias König, Markus 2016-06-28T14:31:51Z Hörteis, Matthias Microscopic thick film contact formation mechanism to p(p+) Si and influence of the metal contact on the Si substrate - lessons learned from the KONSENS project Hahn, Giso The German research project KONSENS investigated the contact formation of screen-printed contacts to crystalline silicon. Special focus was set on contact formation to boron emitters using Al containing Ag thick film pastes and on the formation of local Al contacts. The contact resistances to B emitters using Al containing Ag thick film pastes show dependence on surface topography, i.e. the surface texture. Regarding paste composition, we found that contact formation may be influenced by the amount of Al, as well as by the amount of glass frit. The SiN<sub>X</sub>:H layer serves as a mask during contact formation preserving the Si surface structure above the contact points. A small hole within the SiN<sub>X</sub>:H layer allows for material exchange and thereby facilitates contact formation. This means that the contact spots show the same surface morphology as the Si. Additionally, we find that the contact spots are crystalline and consist mainly of Ag. The pn-junction can be smeared out at points of direct metal-silicon contact. Our data suggest that the Al from the Ag thick film paste does not lead to local Al doping underneath the contact spots. Our findings can be explained by a model for contact formation of Al containing Ag thick film pastes to B emitters. The formation of Al rear contacts is influenced by the Al particle size in the Al thick film paste. Smaller Al particles allow for a more homogenous full area Al BSF. On PERC rear structures smaller Al particles in the Al thick film paste result in a thicker local Al BSF and less maximum spread distance of diffused Si in the Al thick film paste. König, Markus

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