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Analysis and performance of dispensed and screen printed front side contacts at cell and module level

: Rodriguez, C.; Pospischil, M.; Padilla, A.; Kuchler, M.; Klawitter, M.; Geipel, T.; Padilla, M.; Fellmeth, T.; Brand, A.; Efinger, R.; Linse, M.; Gentischer, H.; König, M.; Hörteis, M.; Wende, L.; Doll, O.; Clement, F.; Biro, D.

Fulltext urn:nbn:de:0011-n-3791263 (5.1 MByte PDF)
MD5 Fingerprint: 3341cd4baab10e3dc8b0c1afedb0c827
Created on: 5.3.2016

European Commission:
31st European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2015 : 14 to 18 September 2015, Hamburg, Germany
Hamburg, 2015
ISBN: 3-936338-39-6
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <31, 2015, Hamburg>
Conference Paper, Electronic Publication
Fraunhofer ISE ()
PV Produktionstechnologie und Qualitätssicherung; Silicium-Photovoltaik; Kontaktierung und Strukturierung; Pilotherstellung von industrienahen Solarzellen; Modulintegration; solar cells; metallization; dispensing; paste

In this paper, the potential of applied contact geometries by dispensing, single and double screen printing, are analyzed with respective modeling and simulations at cell and module level. Industrial Cz-Si p-type 156x156 mm² Al-BSF cells are processed to compare the measured values with the estimated ones. A parallel ten nozzle fine line unit is used to print the dispensed fingers while for the screen printing technology, the standard process is applied. An in-depth characterization of the metal contacts by means of laser confocal microscopy, spectrally resolved light beam induced current and micro-light beam induced current (SR-LBIC and LBIC, respectively) is conducted and respective values are applied for predicting cell and module results based on these geometrical parameters. Finally, resulting calculations are compared with measured results. The highest efficiency values are obtained for the dispensing technology, up to 19.3% on cell level and 18.3% on module level after light induced degradation (LID). The intent of this paper is to obtain the mathematical expressions of cell and module parameters to determine the factors with the highest influence over them. By this, an improvement in the fabrication process can be achieved to enhance their electrical performance and reduce the fabrication costs.