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Analysis of the Performance Limitation of Cu Electrodes Deposited on a Stretchable Substrate by Varying the Pre-stretching Ratios
New Phys.: Sae Mulli 2018; 68: 155~159
Published online February 28, 2018;
© 2018 New Physics: Sae Mulli.

Jonghyun JEONG, Jaewook JEONG*

School of Information and Communication Engineering, Chungbuk National University, Cheongju 28644, Korea
Correspondence to:
Received November 23, 2017; Revised December 26, 2017; Accepted January 2, 2018.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
In this paper, the performance variations of stretchable Cu electrodes directly deposited on a polydimethly(siloxane) (PDMS) substrate were analyzed for different pre-stretching ratios of 20 and 40%. Compared to the 20% pre-stretched sample, the 40% pre-stretched sample showed better performance (small variation of resistance) for a low strain, while it showed worse performance (large variation of resistance) for a high strain. Based on the optical microscopy images and the atomic force microscopy images, we found that the many lateral cracks along the horizontal directions due to the restoring force from a Poisson contraction was the main cause for the performance variations of the 40% pre-stretched sample. Therefore, optimizing the pre-stretching ratio to obtain the best performance of the stretchable Cu electrode is important.
PACS numbers: 81.10.Bk, 81.40.Lm
Keywords: PDMS, Cu, Stretchable electrode, Pre-stretching

February 2018, 68 (2)
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