title: Inkjet Fabrication of Copper Patterns for Flexible Electronics: Using Paper with Active Precoatings.
abstract: Low-cost solution-processing of highly conductive films is important for the expanding market of printed electronics. For roll-to-roll manufacturing, suitable flexible substrates and compatible postprocessing are essential. Here, custom-developed coated papers are demonstrated to facilitate the inkjet fabrication of high performance copper patterns. The patterns are fabricated in ambient conditions using water-based CuO dispersion and intense pulsed light (IPL) processing. Papers using a porous CaCO3 precoating, combined with an acidic mesoporous absorption coating, improve the effectiveness and reliability of the IPL process. The processing is realizable within 5 ms, using a single pulse of light. A resistivity of 3.1 ± 0.12 μΩ·cm is achieved with 400 μm wide conductors, corresponding to more than 50% of the conductivity of bulk copper. This is higher than previously reported results for IPL-processed copper.
authors.affiliation: Department of Natural Sciences, Mid Sweden University , SE-85170 Sundsvall, Sweden.
authors.forename: Thomas
authors.initials: T
authors.lastname: Öhlund
authors.affiliation: Institut Charles Gerhardt de Montpellier - UMR 5253 , 34095 Montpellier Cedex 5, France.
authors.forename: Anna K
authors.initials: AK
authors.lastname: Schuppert
authors.affiliation: Department of Natural Sciences, Mid Sweden University , SE-85170 Sundsvall, Sweden.
authors.forename: Magnus
authors.initials: M
authors.lastname: Hummelgård
authors.affiliation: Department of Natural Sciences, Mid Sweden University , SE-85170 Sundsvall, Sweden.
authors.forename: Joakim
authors.initials: J
authors.lastname: Bäckström
authors.affiliation: Department of Electronics Design, Mid Sweden University , SE-85170 Sundsvall, Sweden.
authors.forename: Hans-Erik
authors.initials: HE
authors.lastname: Nilsson
authors.affiliation: Department of Natural Sciences, Mid Sweden University , SE-85170 Sundsvall, Sweden.
authors.forename: Håkan
authors.initials: H
authors.lastname: Olin
keywords: IPL processing; IPL sintering; copper patterns; flash light sintering; inkjet printing; intense pulsed light sintering; paper coatings; printed flexible electronics