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Conductivity and Microstructure of Inkjet-Printed Silver Tracks Depending on the Digital Pattern, Sintering Process, Substrate and Ink

Published online by Cambridge University Press:  07 January 2014

Dana Weise ,
Andrea Grimm ,
Uwe Weiß ,
Kalyan Yoti Mitra ,
Enrico Sowade  and
Reinhard R. Baumann
Dana Weise
Affiliation:
Chemnitz University of Technology, Chemnitz, Germany
Andrea Grimm
Affiliation:
Chemnitz University of Technology, Chemnitz, Germany
Uwe Weiß
Affiliation:
Chemnitz University of Technology, Chemnitz, Germany
Kalyan Yoti Mitra
Affiliation:
Chemnitz University of Technology, Chemnitz, Germany
Enrico Sowade
Affiliation:
Chemnitz University of Technology, Chemnitz, Germany
Reinhard R. Baumann
Affiliation:
Chemnitz University of Technology, Chemnitz, Germany Fraunhofer Institute for Electronic Nano Systems ENAS, Chemnitz, Germany
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Abstract

Silver nanoparticle inks are increasingly applied for the manufacture of inkjet-printed electrically conductive patterns. In order to obtain high conductivity, the printed liquid patterns have to be functionalized by an appropriate post- treatment step. Modern post-treatment methods using e.g. microwaves, intense pulsed light or adopted infrared radiation, are nevertheless the basis of the thermal process. The thermal treatment e.g. in furnaces or on heating plates, is applicable for a great variety of inks and ensures an efficient sintering without major technical efforts. It has been studied intensively wherein the reports mainly focus on reduction of the resistivity by controlling the parameters of the thermal treatment. Our researches exceed these comparative studies by investigating multi-layered patterns, their manufacturing and post-treatment.

Two silver nanoparticle inks were inkjet printed on a rigid and a flexible substrate. The geometry of the patterns was varied. The different drying behaviors of the inks were investigated. In addition, the number of layers which were printed on top of each other was varied. The sintering temperatures and time durations were varied.

The morphology of the patterns is investigated by profilometry and optical microscopy. The microstructure is analyzed by scanning electron microscope and X-ray diffraction. Furthermore, the electrical characteristics were determined by the measurement of the resistance. The results indicate the relation between the manufacture and the resulting microstructure and functionality of the patterns. The knowledge of these parameters enables us to control the industrial manufacturing of similar conductive patterns.

Keywords

ink-jet printingsinteringscanning electron microscopy (SEM)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1630: Symposium O – Adaptive Soft Matter through Molecular Networks , 2014 , mrsf13-1630-o03-20
Copyright
Copyright © Materials Research Society 2014 

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References

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