Conference Program - LOPE-C 2011

SCIENTIFIC CONF. | THURSDAY-JUNE 30, 2011
Track 4
Inorganic Materials (11:30 am - 01:20 pm) | LOCATION HARMONIE D / LEVEL C2
11:30 am Conductive Ink-Jet Printing of Silver and Air-Stable Copper inks for Flexible and Plastic Electronics
Mr Michael Grouchko,
The Hebrew University of Jerusalem, Israel
One of the greatest challenges in fabrication of flexible and plastic electronics devices by printing is to obtain highly conductive patterns at sufficiently low temperatures
which will not damage the heat sensitive substrates. Another challenge is to achieve it by the use of low cost metallic inks. However, to date, sufficient conductivity of
metallic patterns was achieved usually after prolonged heating at elevated temperatures by the use of highly cost metals (silver and gold), thus limiting fabrication of low
cost plastic devices.
We report new copper based metallic inks which anable to achieve high conductivities of printed patterns. These copper inks contain copper nanoparticles synthesized in
aqueous medium, tailored to be sintered at low temperatures. One of the major challenges while using copper is to prevent its oxidation while exposed to air, which in our
case is prevented by coating the copper core nanoparticles by a thin silver shell.
These approaches allow the formation of low cost conductive patterns on flexible and plastic substrates is enabled, for example, the printing of electroluminescence devices
on PET substrate.
12:00 pm Low temperature processing of inkjet printed metal oxides and nanoparticles
Dr Nenad Marjanovic,
Fraunhofer Institute for Electronic Nano Systems ENAS, Senior Scientist, Germany
Amorphous metal oxides and nanoparticles have numerous advantages due to their atmospheric and temperature stability, as well as relatively high field-effect mobility,
which make them competitive candidates to be integrated into functional devices and electronic systems. However, high sintering temperatures, in some cases up to 400
°C, are required to remove residual organic components upon printing, as well as to sinter the printed film to impart continuity. The organic additives are necessary to
prepare stable solutions or dispersions of these materials as inkjet inks. Therefore, material design, inks formulation, printing and low temperature film formation/processing
are of highest importance, in order to enable the deployment of those materials in electronic systems on polymer substrates (e.g. Polyethylene terephthalate (PET)), which
are commonly used for Printed Electronics. Here, we are reporting on the characterization and application of inkjet printed amorphous Silicon oxide layer on PET. The
sol-gel process was applied for obtaining Silicon oxide ink. The inkjet printing, sintering behavior under room temperature, and the effect of solvent and surfactant on silicon
matrix were investigated. The studies on film formation, morphological and electrical film characterization will be presented. In addition, colloidal Ferromagnetic
nanoparticles synthesized in organic solvents were also inkjet printed. The influence of capping agent such as oleylamine and oleic acid on ferromagnetic nanoparticles
was investigated. Results on room temperature film formation will be presented.
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