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[International Journal] Highly Conductive Transparent and Flexible Electrodes including Double Stacked Thin Metal Films for Transparent Flexible Electronics
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Jun Hee Han, Do-hong Kim, Eun Gyo Jeong, Tae-Woo Lee, Myung Keun Lee, Jeong Woo Park, Hoseung Lee, and Kyung Cheol Choi

ACS Appl. Mater. Interfaces, April , 2017

Published

vol 9, no 19, pp 16343-16350

Abstract
In order to keep pace with the era of transparent and deformable electronics, the electrode functions should be improved. In this paper, an innovative structure is suggested to overcome the tradeoff between optical and electrical properties that commonly arises with transparent electrodes. The structure of double stacked metal films showed high conductivity (< 3 Ω/sq.) and high transparency (~90 %) simultaneously. A proper space between two metal films led to high transmittance by an optical phenomenon. The principle of parallel connection allowed the electrode to have high conductivity. In situ fabrication was possible because the only materials composing the electrode were silver and WO3, which can be deposited by thermal evaporation. The electrode was flexible enough to withstand 10,000 bending cycles with a 1 mm bending radius. Furthermore, a few μm scale patterning of the electrode was easily implemented by using photolithography, which is widely employed industrially for patterning. Flexible organic light emitting diodes and a transparent flexible thin film transistor were successfully fabricated with the proposed electrode. Various practical applications of this electrode to new transparent flexible electronics are expected.