Metal nanowire percolation micro-grids embedded in elastomers for stretchable and transparent conductors

Abstract

Next-generation stretchable optoelectronics require functional electric conductors with mechanical stretchability and optical transparency. We present a new class of highly stretchable and transparent conductors based on silver nanowire (AgNW) percolation micro-grids embedded in an elastomeric substrate. These are prepared by simple spray-coating and subsequent adhesive-tape-assisted contact-removal of AgNWs. The synergistic combination of the percolated NWs and regular micro-grid geometry in an integrated form makes it possible to achieve uniform, reproducible, and predictable performance of the resulting AgNW micro-grids and ensure good stretchability. The fabricated device shows superior optoelectronic performance with a sheet resistance of 26.1 Ω sq⁻¹ and an optical transmittance of 85.8%. In addition, the device can reversibly accommodate various mechanical deformations, such as stretching, bending, and twisting.