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A High Aspect Ratio Serpentine Structure for Use As a Strain‐Insensitive, Stretchable Transparent Conductor
Author(s) -
Jang Sungwoo,
Kim Choelgyu,
Park Jung Jin,
Jin Ming Liang,
Kim Seon Joon,
Park O Ok,
Kim TaekSoo,
Jung HeeTae
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201702818
Subject(s) - materials science , transmittance , aspect ratio (aeronautics) , conductor , electrical conductor , optoelectronics , sheet resistance , stretchable electronics , electrical resistance and conductance , composite material , nanotechnology , conductance , electronics , electrical engineering , layer (electronics) , engineering , mathematics , combinatorics
The development of strain‐insensitive stretchable transparent conductors (TCs) is essential for manufacturing stretchable electronics. Despite recent progress, achieving a high optoelectronic performance under applied strain of 50% continues to present a significant challenge in this research field. Herein, an ultratall and ultrathin high aspect ratio serpentine metal structure is described that exhibits a remarkable stretching ability (the resistance remains constant under applied strain of 100%) and simultaneously provides an excellent transparent conducting performance (with a sheet resistance of 7.6 Ω −1 and a transmittance of 90.5%). It is demonstrated that the highly stretchable transparent conducting properties can be attributed to the high aspect ratio feature. A high aspect ratio (aspect ratio of 17–367) structure permits facile deformation of the serpentine structure with in‐plane motion, leading to a high stretching ability. In addition, this structural feature avoids the classic tradeoff between optical transmittance and electrical conductance, providing a high electrical conductance without decreasing the optical transmittance. The practical utility of these devices is tested by using these TCs as stretchable interconnectors among LEDs or in wearable VOC gas sensors.