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Scalable Solution-processed Fabrication Strategy for High-performance, Flexible, Transparent Electrodes with Embedded Metal Mesh
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Fabrication of Oxidation-Resistant Metal Wire Network-Based Transparent Electrodes by a Spray-Roll Coating Process.
S Kiruthika1, Ritu Gupta2, Aman Anand1
1Chemistry & Physics of Materials Unit and Thematic Unit of Excellence in Nanochemistry, Jawaharlal Nehru Centre for Advanced Scientific Research , Jakkur P.O., Bangalore 560064, India.
ACS Applied Materials & Interfaces
|November 19, 2015
Summary
Researchers developed a low-cost fabrication method for transparent and conducting electrodes (TCEs) using crackle lithography. This technique enhances electrode stability and oxidation resistance, paving the way for durable electronic devices.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Engineering
Background:
- Transparent and conducting electrodes (TCEs) are crucial components in electronic devices.
- Existing TCE fabrication methods often involve complex processes or expensive materials.
- Improving the oxidation resistance and durability of TCEs remains a significant challenge.
Purpose of the Study:
- To develop a simple, low-cost solution-processable method for fabricating highly oxidation-resistant TCEs.
- To investigate the use of crackle lithography for creating interconnected conductive networks.
- To enhance the stability and performance of TCEs through material modification and coating.
Main Methods:
- Utilized roll and spray coating techniques combined with crackle lithography on PET substrates.
- Fabricated silver (Ag) TCEs by spraying Ag precursor ink over a crackle template, followed by lift-off and annealing.
- Enhanced oxidation resistance of Ag TCEs by electroless coating with palladium (Pd).
- Developed low-cost Ag/Cu TCEs using a silver seed layer and electroless copper growth.
Main Results:
- Achieved Ag TCEs with 78% transmittance and ~20 Ω/□ sheet resistance.
- Demonstrated stability of Ag wire mesh under bending and sonication, but noted susceptibility to oxidation.
- Pd coating significantly improved the robustness of Ag TCEs against harsh oxidation.
- Ag/Cu meshes exhibited high stability for over a year in ambient atmosphere.
Conclusions:
- Crackle lithography offers a scalable and cost-effective approach for fabricating robust TCEs.
- Electroless Pd and Cu coating are effective strategies to enhance the oxidation resistance and long-term stability of TCEs.
- The developed Ag/Cu meshes represent a promising low-cost alternative for durable transparent electrodes.
