Large-scale roll-to-roll photonic sintering of flexo printed silver nanoparticle electrodes

Markus Hösel, Frederik C Krebs

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In this report we employ static and roll-to-roll (R2R) photonic sintering processes on flexo printed silver nanoparticle-based electrode structures with a heat-sensitive 60 mm thin barrier foil as a substrate.
We use large area electrode structures to visualize the increased optical footprint of single and quadruple flashes, and the R2R challenges in the form of overlapping exposures. It is shown that single flash exposure is enough to significantly increase the conductivity and adhesion without damaging the foil or build-up of cracks in the silver layer. Additional flash exposures or increased energies above the
threshold level have only minor impact on the conductivity but lead to cracks and substrate deformation. A second silver nanoparticle ink was printed, which was already optimized for lowtemperature
drying. Here we show that photonic sintering has only a minor impact on the conductivity as the nanoparticles are already sintered. The advantage of single exposure is the ability to produce higher R2R processing speeds without overlapping, which is shown in the form of theoretical calculations.
Original languageEnglish
JournalJournal of Materials Chemistry
Pages (from-to)15683–15688
Publication statusPublished - 2012

Bibliographical note

This work was supported by the Danish Strategic Research
Council (2104-07-0022), EUDP ( 64009-0050 and 64011-
0002), the EU-Indian framework of the ‘‘Largecells’’ project as part of the European Commission’s Seventh Framework Programme
(FP7/2007-2013, grant no. 261936). Thanks go to the
Chemistry and Physics of Materials Unit group of Prof. G. U.
Kulkarni from Jawaharlal Nehru Centre for Advanced Scientific
Research (Bangalore, India) for using the surface characterization


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