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The effect of torsional bending on reliability and lifetime of printed silver conductors

Hannila, Esa; Remes, Kari; Kurkela, Timo; Happonen, Tuomas; Keränen, Kimmo; Fabritius, Tapio (2020-05-07)

 
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https://doi.org/10.1109/TED.2020.2990125

Hannila, Esa
Remes, Kari
Kurkela, Timo
Happonen, Tuomas
Keränen, Kimmo
Fabritius, Tapio
Institute of Electrical and Electronics Engineers
07.05.2020

E. Hannila, K. Remes, T. Kurkela, T. Happonen, K. Keränen and T. Fabritius, "The Effect of Torsional Bending on Reliability and Lifetime of Printed Silver Conductors," in IEEE Transactions on Electron Devices, vol. 67, no. 6, pp. 2522-2528, June 2020, doi: 10.1109/TED.2020.2990125

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© 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
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doi:https://doi.org/10.1109/TED.2020.2990125
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https://urn.fi/URN:NBN:fi-fe2020062645936
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Abstract

Capability of high-speed and low-cost manufacturing makes the printing techniques a very promising approach for large-area flexible electronics mass manufacturing. Due to fast and intensive technology development, the lack of knowledge about the reliability and lifetime of printed electronics is obvious, requiring further investigation. Especially, the effect of torsional bending on lifetime is a mostly unexplored field of reliability testing. In this article, a torsional bending test of parallel printed silver conductors (0.3-, 0.5-mm pitch) on polymer substrate (polyethylene terephthalate, 125-μm thickness) was conducted and analyzed. According to the experimental results, torsional bending causes wear-out type failures in conductors and the length-to-width (LTW) ratio of the sample’s substrate was observed to have a significant impact on reliability. If the LTW ratio is smaller than 3, the lifetime of printed conductor seems to collapse and samples lasted for approximately only 17 bending cycles on average. Lifetime was improved by increasing the LTW ratio and samples withstood over hundreds of cycles with LTW ratio of higher than 15. However, the distance of a conductor from the edge of the substrate was not observed to have any significant influence on the reliability under torsional bending.

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