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Insu Jin1 Jaewoong Jung1

1, KyungHee University, Yongin-si, , Korea (the Republic of)

Silver nanowires (Ag NWs) have been extensively studied as the material of the transparent conductive electrode (TCE), as a promising replacement of conventional indium tin oxide (TIO). However, a typical polyol synthesis of Ag NWs employs insulating polymers as surfactants for the growth, stability and dispersion of silver., which limits efficient electron transport between each nanowire. Although the conventional post-treatments such as thermal welding process could improve transmittance and sheet resistance of Ag NWs networks, they usually require high temperature or complicated process that may limit the choice of substrate. In this presentation, we demonstrate the simple solvent treatment to enhance the optoelectronic properties of Ag NW networks. The solvent treatment effectively washes out the surrounding insulating polymer, which results in significantly improvement of transmittance and sheet resistance of Ag NW networks. By the optimization of the solvent treatment, we successfully fabricated a high performance TCE with a sheet resistance of 12.95 Ω/sq and a transmittance of 81.25% at 550 nm. The solvent treatment was also suitable for flexible substrate, leading to 16.29 Ω/sq and a transmittance of 78.76% at 550 nm. For the practical applications, transparent thin film heaters (TFHs) made of Ag NW networks followed by the solvent treatment was also fabricated. The TFHs exhibited a good performance of 155 °C at a bias of 5 V. In addition, the flexible TFHs based on Noland Optical Adhesive 63 as a substrate afforded a high performance flexible TFHs with a quick response time (15 s). This TFH exhibits good optoelectronic properties and outstanding mechanical robustness against deformation, such as flexibility and deformability. Therefore, this substrate can be used as a flexible and deformable heater and the temperature can exceed 110 °C at a bias of 4 V. This work clearly demonstrates the efficacy of simple solvent treatment for practical use of Ag NWs and to be formed into various shapes for TCE and TFHs.

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