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Chauvin, A., Heu, W. T. C., Buh, J., Tessier, P.-Y. & Mel, A.-A. E. (2019) Vapor dealloying of ultra-thin films: a promising concept for the fabrication of highly flexible transparent conductive metal nanomesh electrodes. npj Flex Electron, 3 1–6. 
Added by: Richard Baschera (2019-12-09 11:07:00)   Last edited by: Richard Baschera (2019-12-09 11:08:02)
Type de référence: Article
DOI: 10.1038/s41528-019-0049-1
Numéro d'identification (ISBN etc.): 2397-4621
Clé BibTeX: Chauvin2019a
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Créateurs: Buh, Chauvin, Heu, Mel, Tessier
Collection: npj Flex Electron
Consultations : 9/262
Indice de consultation : 3%
Indice de popularité : 0.75%
Liens URLs     https://www.nature ... /s41528-019-0049-1
The booming market of flexible electronic displays has urged the development of highly flexible transparent conductive electrodes (FTCE)1–3 with the ability to replace indium tin oxide (ITO) thin films routinely used as transparent conductive electrodes in photoelectronic devices. The high cost of indium and the poor mechanical stability of ITO under deformation are the main driving forces behind the development of this research area.4 The use of metal nanomeshes as FTCE is a promising concept with a real potential to substitute ITO in photoelectronic devices.5,6 However, the development of a low-cost fabrication approach allowing producing metal nanomesh electrodes with competitive prices and a high performance remains a real bottleneck for the photoelectronic industry. In this paper, we report on a robust approach very easy to implement allowing producing highly flexible metal nanomesh electrodes with high performance at a very low cost. This approach lies on a concept consisting in applying dealloying process to ultra-thin Au-Cu alloy thin films using acidic vapors instead of a liquid phase as routinely done in the literature. Using an appropriate procedure, the nanomeshes can be transferred to any planar or curved support where they can serve as a FTCE. As a proof of concept, we demonstrate that using this approach, one can easily fabricate gold nanomesh electrodes transferred onto polyethylene terephthalate (PET) film surface with 79% of transmittance and a sheet resistance as low as 44 Ω □−1 while maintaining exceptional stability under severe mechanical deformations. A simple chemical vapor treatment method has been developed to fabricate highly transparent and flexible conducting electrodes with Au-Cu alloy. A team of scientists led by Prof Abdel-Aziz El Mel from Université de Nantes, CNRS, France develop a cheap ‘vapor de-alloying’ approach to make flexible transparent conductive electrodes. They find that the nitric acidic vapor can gradually etch the ultra-thin Au-Cu alloy thin films and form holey yet continuous metal nanomesh electrodes. As a result, the electrodes show high transmittance of 79% and low sheet resistance of 44 ohm per square, comparable to conventional indium tin oxide. Remarkably, the nanomesh electrodes pass stringent mechanical deformation test of 10,000 cycles at a bending radius of 6 mm. This approach provides a nice alternative to make transparent conductive electrodes with high flexibility and bendability.
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