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Facile Fabrication of Highly Conductive, Ultrasmooth, and Flexible Silver Nanowire Electrode for Organic Optoelectronic Devices

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journal contribution
posted on 01.11.2019 by Dang-Thuan Nguyen, Hongseok Youn
So far, one of the fundamental limitations of silver nanowires (Ag NWs) is the high contact resistance among their junctions. Moreover, a rough surface due to its random arrangement is inevitable to electrical short when the nanowire-based electronics is driving. To improve the contact resistance, we suggest that the particle shape nanocrystals are intentionally reduced at the junctions by a localized joule-heat reduction approach from the silver ions. Via localized reductions, the reduced nanoparticles effectively weld the junction’s areas, resulting in a 19% decrease in sheet resistance to 9.9 Ω sq–1. Besides, the nanowires are embedded into a polyamide film with gentle hot pressing. Consequently, the roughness was considerably dropped so that it was successful to demonstrate organic light-emitting diodes (OLEDs) with nanowires, which was beneficial to be laminated with OLEDs under the low temperature. The experimental results show that the Ag NW-embedded films reach 10.9 Ω sq–1 of the sheet resistance at 92% transmittance and the roughness was only 1.92 nm.