Halide Welding for Silver Nanowire Network Electrode

Hyungseok Kang, Yeontae Kim, Siuk Cheon, Gi Ra Yi, Jeong Ho Cho

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

We developed a method of chemically welding silver nanowires (AgNWs) using an aqueous solution containing sodium halide salts (NaF, NaCl, NaBr, or NaI). The halide welding was performed simply by immersing the as-coated AgNW film into the sodium halide solution, and the resulting material was compared with those obtained using two typical thermal and plasmonic welding techniques. The halide welding dramatically reduced the sheet resistance of the AgNW electrode because of the strong fusion among nanowires at each junction while preserving the optical transmittance. The dramatic decrease in the sheet resistance was attributed to the autocatalytic addition of dissolved silver ions to the nanowire junction. Unlike thermal and plasmonic welding methods, the halide welding could be applied to AgNW films with a variety of deposition densities because the halide ions uniformly contacted the surface or junction regions. The optimized AgNW electrodes exhibited a sheet resistance of 9.3 ω/sq at an optical transmittance of 92%. The halide welding significantly enhanced the mechanical flexibility of the electrode compared with the as-coated AgNWs. The halide-welded AgNWs were successfully used as source-drain electrodes in a transparent and flexible organic field-effect transistor (OFET). This simple, low-cost, and low-power consumption halide welding technique provides an innovative approach to preparing transparent electrodes for use in next-generation flexible optoelectronic devices.

Original languageEnglish
Pages (from-to)30779-30785
Number of pages7
JournalACS Applied Materials and Interfaces
Volume9
Issue number36
DOIs
Publication statusPublished - 2017 Sep 13

Bibliographical note

Funding Information:
This work was supported by the Center for Advanced Soft Electronics (CASE) under the Global Frontier Research Program (NRF-2013M3A6A5073177) and Basic Science Research Program (NRF-2017R1A2B2005790 and NRF-2014M3A9B8023471) of the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning, Korea.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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