LGP2 - Functional printing: from the study of printed layers to the prototyping of flexible devices
Published on February 26, 2015
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December 11, 2014
Daniele Sette defended his University of Grenoble doctoral thesis entitled "Functional printing: from the study of printed layers to the prototyping of flexible devices".
This thesis was prepared under the supervision of Anne Blayo, Lecturer-Researcher, Laboratory LGP2, and of Christophe Poulain, CEA. In the last decade, functional printing has gained a large interest for the manufacturing of electronic components. It stands aside to silicon technologies and specifically targets markets of large area devices (screens, photovoltaics) and flexible electronics (RFID antennas, sensors, smart textiles).
In this work, inkjet printed silver layers are characterized depending on the printing conditions and the required post-printing annealing. The evolution of their microstructure, electrical and mechanical properties is investigated as a function of the annealing temperature. The correlation of the measurements with theoretical models supports the experimental methods that were developed. The knowledge of the printed silver layers assets and the optimization of the printing process lead to the design, fabrication and characterization of flexible electronics devices: a 17 GHz band-pass filter printed on plastic, a flexible vacuum micro-sensor working on the Pirani principle, and a 250 µm thick membrane switch for keyboards. Finally, all printed RF capacitors were realized by stacking Barium Strontium Titanate dielectric and silver printed layers.
These prototypes exhibit performances near the state-of-the-art and suggest new opportunities for printing technologies. This thesis offers a thorough study of inkjet printed silver layers and assess their potential for the manufacturing of flexible devices.