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Large-scale fabrication of all-inkjet-printed resistors and WORM memories on flexible polymer films with high yield and stability

: Ramon, E.; Sowade, E.; Martinez-Domingo, C.; Mitra, K.Y.; Alcalde, A.; Baumann, R.R.; Carrabina, J.

Volltext ()

Flexible and printed electronics 6 (2021), Nr.1, Art. 015003, 15 S.
ISSN: 2058-8585
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ENAS ()

We report on the development of inkjet-printed thin-film resistors using both organic and inorganic ink formulations. The passive devices were manufactured on flexible polymer substrates in ambient condition without the need for a cleanroom environment or inert atmosphere and at a maximum temperature of 150 °C. By using the same manufacturing process, the rapid electrical sintering (RES) method is demonstrated as effective for the fabrication of inkjet-printed, programmable Write-Once-Read-Many (WORM) memories. Several hundred fully inkjet-printed resistors with different parameters were fabricated and subsequently morphologically and electrically characterized with the aim of obtaining statistically significant data. From a manufacturing process viewpoint, the procedures based on inkjet printing herein described are highly attractive: they do not require high temperatures, low pressures, special atmospheric conditions, and any masks, therefore providing a versatile low-cost approach to fabricate passive electrical components and simple circuits useful for the electronic industry. Printing can be carried out at a sufficiently low temperature to avoid damage to the fabric substrate and these devices can be used in a range of applications requiring flexible and conformal devices from embedded passive filters in PCBs to wearable electronics.