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Sensors 2019, 19(3), 444; https://doi.org/10.3390/s19030444

Contactless In Situ Electrical Characterization Method of Printed Electronic Devices with Terahertz Spectroscopy

1
Département de Génie Électrique, École de Technologie Supérieure (ÉTS), Montréal, QC H3C1K3, Canada
2
Institut National de la Recherche Scientifique, Énergie, MatéRiaux et Télécommunications (INRS-EMT), Varennes, QC J3X1S2, Canada
3
Département de Génie Mécanique, École de Technologie Supérieure (ÉTS), Montréal, QC H3C1K3, Canada
*
Author to whom correspondence should be addressed.
Received: 20 November 2018 / Revised: 4 January 2019 / Accepted: 17 January 2019 / Published: 22 January 2019
(This article belongs to the Special Issue THz Imaging Systems and Sensors)
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Abstract

Printed electronic devices are attracting significant interest due to their versatility and low cost; however, quality control during manufacturing is a significant challenge, preventing the widespread adoption of this promising technology. We show that terahertz (THz) radiation can be used for the in situ inspection of printed electronic devices, as confirmed through a comparison with conventional electrical conductivity methods. Our in situ method consists of printing a simple test pattern exhibiting a distinct signature in the THz range that enables the precise characterization of the static electrical conductivities of the printed ink. We demonstrate that contactless dual-wavelength THz spectroscopy analysis, which requires only a single THz measurement, is more precise and repeatable than the conventional four-point probe conductivity measurement method. Our results open the door to a simple strategy for performing contactless quality control in real time of printed electronic devices at any stage of its production line. View Full-Text
Keywords: printed electronics; inkjet printing; terahertz time-domain spectroscopy; vortex phase plate; vortex beam printed electronics; inkjet printing; terahertz time-domain spectroscopy; vortex phase plate; vortex beam
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Zhuldybina, M.; Ropagnol, X.; Trudeau, C.; Bolduc, M.; Zednik, R.J.; Blanchard, F. Contactless In Situ Electrical Characterization Method of Printed Electronic Devices with Terahertz Spectroscopy. Sensors 2019, 19, 444.

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