Self-assembled large scale metal alloy grid patterns as flexible transparent conductive layers

Scientific Reports
Melinda MohlKrisztián Kordás

Abstract

The development of scalable synthesis techniques for optically transparent, electrically conductive coatings is in great demand due to the constantly increasing market price and limited resources of indium for indium tin oxide (ITO) materials currently applied in most of the optoelectronic devices. This work pioneers the scalable synthesis of transparent conductive films (TCFs) by exploiting the coffee-ring effect deposition coupled with reactive inkjet printing and subsequent chemical copper plating. Here we report two different promising alternatives to replace ITO, palladium-copper (PdCu) grid patterns and silver-copper (AgCu) fish scale like structures printed on flexible poly(ethylene terephthalate) (PET) substrates, achieving sheet resistance values as low as 8.1 and 4.9 Ω/sq, with corresponding optical transmittance of 79% and 65% at 500 nm, respectively. Both films show excellent adhesion and also preserve their structural integrity and good contact with the substrate for severe bending showing less than 4% decrease of conductivity even after 10(5) cycles. Transparent conductive films for capacitive touch screens and pixels of microscopic resistive electrodes are demonstrated.

References

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Citations

Nov 18, 2015·Scientific Reports·Mini Mol MenamparambathSeunghyun Baik
Oct 11, 2016·Chemical Reviews·Oksana Ostroverkhova
May 4, 2018·Chemical Society Reviews·Dongrui WangZijian Zheng
Jan 23, 2018·Small·Haifei LuWallace C H Choy
Jan 20, 2018·Soft Matter·Sergey V PyrlinMarta M D Ramos
Jun 2, 2020·The Journal of Physical Chemistry. B·Kristina Jajcevic, Kaori Sugihara
Jul 1, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Hameed UllahPierre Bonnet
Aug 7, 2018·ACS Applied Materials & Interfaces·Li ChangLei Jiang

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Methods Mentioned

BETA
electron microscopy
atomic force microscopy
electron
X-ray
AFM
optical microscopy

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