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http://dx.doi.org/10.6117/kmeps.2020.27.2.045

Mechanical Fatigue Lifetime of Metal Electrode for Flexible Electronics under High Temperature and High Humidity Condition  

Kown, Yong-Wook (School of Materials Science & Engineering, Andong National University)
Kim, Byoung-Joon (School of Materials Science & Engineering, Andong National University)
Publication Information
Journal of the Microelectronics and Packaging Society / v.27, no.2, 2020 , pp. 45-51 More about this Journal
Abstract
As flexible electronics will be used under high temperature and high humidity with repeated bending deformations, the effects of environmental condition and repeated mechanical deformations are considered simultaneously to achieve long-term reliability. In this study, the mechanical reliability of metal electrodes (Al, Ag, Cu) deposited on flexible polymer substrate is investigated under 4 different conditions: with and without repeated mechanical deformations and normal environmental or high temperature and high humidity conditions (85℃/85%). The mechanical failure does not occur in all the metal electrodes without mechanical deformation even under high temperature and high humidity conditions. The electrical resistance of metal electrode increased about 400% to 600% after 100,000 bending cycles under normal condition. For high temperature and high humidity condition, the electrical resistance of Al and Ag increased similarly. However, the resistance of Cu during bending fatigue test under high temperature and high humidity condition increased over 90000% because of the combined effect of corrosion and mechanical fatigue. This study can give a helpful information for designing electrode materials with high mechanical reliability under high temperature and high humidity.
Keywords
Flexible; Metal; Temperature; Humidity; Fatigue; Reliability;
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Times Cited By KSCI : 2  (Citation Analysis)
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