Highly-robust, solution-processed flexible transparent electrodes with a junction-free electrospun nanofiber network.

Area of Science:

• Materials Science
• Nanotechnology
• Electrical Engineering

Background:

• Flexible transparent electrodes (FTEs) are crucial for advanced electronics like flexible displays and wearable devices.
• Achieving a balance between electrical sheet resistance, optical transparency, and mechanical flexibility in FTEs is challenging due to their inverse relationships.
• Existing fabrication methods often struggle to optimize these properties simultaneously, necessitating novel approaches.

Purpose of the Study:

• To present a new fabrication method for FTEs on flexible polyimide films.
• To achieve active control over sheet resistance and transparency while maintaining mechanical flexibility.
• To develop a scalable and cost-effective manufacturing process for FTEs.

Main Methods:

• Fabrication of FTEs using electrospinning to create a seed layer on polyimide films.
• Application of copper electroless deposition and heat treatment to form a flat metal network.
• Characterization of electrical sheet resistance, optical transparency, and mechanical flexibility.

Main Results:

• Fabricated FTEs demonstrated optical transparency exceeding 80% across the visible spectrum.
• Achieved low electrical sheet resistance below 10.0 Ω sq^-1.
• Superior adhesion of the metal network to the substrate due to heat treatment, outperforming other electrospinning-based methods.
• Demonstrated suitability for large-area manufacturing with a network density standard deviation of approximately 1%.

Conclusions:

• The proposed electrospinning and copper electroless deposition method effectively produces high-performance FTEs.
• The technique offers advantages for mass production, avoiding polymer casting and enabling diverse applications.
• This method provides a viable solution for creating flexible transparent electrodes with controlled properties.