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Transparent Omni‐Directional Stretchable Circuit Lines Made by a Junction‐Free Grid of Expandable Au Lines
Author(s) -
Kong Minsik,
You Insang,
Lee Gilwoon,
Park Gyeongbae,
Kim Jaehyun,
Park Doowon,
Jeong Unyong
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202100299
Subject(s) - materials science , optoelectronics , transparency (behavior) , coating , aluminium , short circuit , grid , line (geometry) , electrical conductor , diode , oxide , nanotechnology , composite material , electrical engineering , voltage , computer science , metallurgy , geometry , computer security , mathematics , engineering
Although various stretchable optoelectronic devices have been reported, omni‐directionally stretchable transparent circuit lines have been a great challenge. Cracks are engineered and fabricated to be highly conductive patterned metal circuit lines in which gold (Au) grids are embedded. Au is deposited selectively in the cracks to form a grid without any junction between the grid lines. Since each grid line is expandable under stretching, the circuit lines are stretchable in all the directions. This study shows that a thin coating of aluminum on the oxide surface enables precise control of the cracks (crack density, crack depth) in the oxide layer. High optical transparency and high stretchability can be achieved simultaneously by controlling the grid density in the circuit line. Light‐emitting diodes are integrated directly on the circuit lines and stable operation is demonstrated under 100% stretching.