Journal
EXTREME MECHANICS LETTERS
Volume 2, Issue -, Pages 37-45Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.eml.2015.01.010
Keywords
Indium Tin Oxide (ITO); Serpentine; Stretchable
Funding
- NSF CMMI award [1351875]
- NSF EEC NASCENT (Nanomanufacturing Systems for Mobile Computing and Mobile Energy Technologies) Center [1160494]
- University of Texas at Austin
- 3M Non-Tenured Faculty Award
- Directorate For Engineering
- Div Of Engineering Education and Centers [1160494] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1351875] Funding Source: National Science Foundation
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Indium Tin Oxide (ITO) has been widely used as the electrode material in touch-screen displays and solar cells attributing to its combined high electrical conductivity and optical transparency. Moving forward from wafer based electronics to flexible/stretchable electronics, brittle electronic materials like ITO are significantly hindering the deformability of the integrated systems. To minimize strains in inorganic materials when subjected to stretch, thin metallic and ceramic films can be patterned into serpentine-shaped ribbons. Although polymer-supported metallic serpentines have received extensive studies, it has been a challenging task to fabricate brittle ceramic serpentine ribbons on stretchable substrates. In this letter, we report a low cost, completely dry fabrication process to successfully integrate brittle ITO serpentine ribbons on stretchable substrates. Uniaxial tension tests are performed with in situ electrical resistance measurements which are used as an indicator of the mechanical integrity of the ITO ribbons. Effects of serpentine-substrate adhesion and serpentine geometry are systematically investigated. When the adhesion is weak, stretchability as high as 200% can be achieved. When the adhesion is strong, a new failure mechanism is observed. Design guidelines can be proposed for different adhesion conditions based on this study. (C) 2015 Elsevier Ltd. All rights reserved.
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