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Flexible transparent electrodes play a decisive role in the development of the electronics and optoelectronics industry, and are indispensable photoelectric functional materials for the preparation of numerous electronic and optoelectronic components. At present, the flexible transparent electrode is mainly on the transparent organic polymer substrate, using sol-gel, chemical vapor deposition, vacuum evaporation deposition, sputtering deposition, pulsed laser deposition and other methods to introduce indium tin oxide (ITO) conductive film. However, this method has fatal weaknesses: 1) metal indium faces resource depletion; 2) the preparation process is expensive and requires high temperatures, which is a severe test for transparent organic polymer substrates. As a transparent conductive layer, silver nanowires have attracted wide attention from research institutions and industry, and are expected to become alternatives to ITO. However, the contact resistance between silver nanowires is high, and nano-scale silver is easily oxidized, which severely limits the application of silver nanowire transparent electrodes in optoelectronic devices.
In response to this problem, the Biomimetic Intelligent Interface Science Laboratory of the Institute of Physics and Chemistry, Chinese Academy of Sciences designed and manufactured a high conductivity and high conductivity by selective chemical welding of silver nanowires and the introduction of a stable conductive ionic liquid gel protective layer. Silver nanowire @ ionic liquid gel composite flexible transparent electrode with high transmittance and excellent air stability. On one hand, the difference in wettability between the ultra-hydrophilic silver nanowire network and the hydrophobic transparent substrate allows the chemical soldering to be selectively performed on the silver nanowires, thereby being able to greatly reduce the contact resistance of the silver nanowires. The high visible light transmittance is maintained; on the other hand, the introduction of a thin layer of ionic liquid gel gives excellent air stability to the composite transparent electrode, and the thin layer of ionic liquid gel has anti-reflection effect, which is favorable for obtaining high visible light transmittance. Over rate. The prepared composite flexible transparent electrode had a sheet resistance of only 8.4 Ωsq-1 while maintaining a visible light transmittance of 86%. More importantly, exposure to air for 2 months, the performance of the composite transparent electrode remains unchanged. This high-performance silver nanowire@ionic liquid gel composite flexible transparent electrode is of great significance for the development of a new type of stable and efficient flexible transparent optoelectronic device. The research results were recently published in the International Materials Journal (Advanced Materials 2016, DOI: 10.1002/adma.201600358).
The relevant research work has received strong support from the National Key Basic Research Program of the Ministry of Science and Technology, the National Natural Science Foundation of China, the National Natural Science Foundation of China, and the talent plan of the Chinese Academy of Sciences Green Promotion Association.
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