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Development of via pastes for high efficiency MWT cells with a low shunting behaviour

: Neidert, M.; Clement, F.; Menkö, M.; Hoenig, R.; Henning, A.; Zhang, W.; Biro, D.; Preu, R.

Volltext urn:nbn:de:0011-n-1435373 (617 KByte PDF)
MD5 Fingerprint: e08ff7a1ace6a4b355d68168b51f4d8d
Erstellt am: 15.8.2012

Sinke, W. ; WIP - Renewable Energies, München; European Commission; UNESCO; World Council for Renewable Energy; International Photovoltaic Equipment Association:
24th European Photovoltaic Solar Energy Conference 2009. CD-ROM : The compiled State-of-the-Art of PV Solar Technology and Deployment. Proceedings of the International Conference held in Hamburg, 21-25 September 2009
München, 2009
ISBN: 3-936338-25-6
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <24, 2009, Hamburg>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()

A key component for MWT solar cells is the interconnection between front and rear side. Therefore, a reliable connection with low series resistance losses between front and rear side is necessary. This can be achieved by a high quality via paste. Furthermore, a low shunting behaviour is a must for the via paste in order to maintain high fill factors for MWT solar cells [3,4]. Moreover, the printability of the via paste needs be optimized to perform a proper via metallization. To implement this key factors, an extensive development was set up consisting multiple phases of experiments. In this work the coarse survey of the design process is described, which successfully results in an optimized silver via paste formulation to achieve best electrical and mechanical performance. These pastes were tested within an industrial applicable MWT process flow developed at the pilot-line of the PV-Technology Evaluation Center (PV-TEC) at Fraunhofer ISE Freiburg [5] as well as within the pilot-line of the cell manufacturer Bosch Solar Energy AG [8,9]. Feasibility and reliability of paste and process are demonstrated with the potential to generate an efficiency gain up to 0.5% absolute compared with conventionally processed solar cells.