Open-Air Combustion Synthesis with Rapid Plasma Processing of Large-Area Transparent Conducting Oxides

Area of Science:

• Materials Science
• Chemical Engineering
• Plasma Physics

Background:

• Transparent conductive oxides (TCOs) are crucial for electronic devices.
• Current manufacturing methods often rely on expensive vacuum-based techniques.
• There is a need for scalable, cost-effective TCO synthesis.

Purpose of the Study:

• To develop a vacuum-free, high-throughput synthesis method for indium tin oxide (ITO).
• To achieve tunable control over ITO's amorphous or crystalline phases.
• To demonstrate a cost-effective and scalable manufacturing process for TCOs.

Main Methods:

• Combustion Oxidation with Rapid Plasma Processing (CORP) using a solution-based exothermic reaction.
• Open-air, forming gas plasma treatment for oxygen vacancy introduction and crystallization.
• Extended X-ray absorption spectroscopy fine structure (EXAFS) analysis to study structural evolution.

Main Results:

• Fabrication of 300 cm² ITO with sheet resistance of 38 Ω sq⁻¹, 89% visible transmission, and stability over 250 days.
• Achieved low roughness (< 2nm) and a Haacke figure of merit of 0.012 Ω⁻¹.
• Cost modeling indicated up to a 67% price reduction for TCOs compared to vacuum sputtering.

Conclusions:

• CORP provides a viable vacuum-free, high-throughput method for ITO synthesis.
• The process enables tunable phase control and excellent material properties.
• This work presents a pathway for low-cost, commercial-scale TCO manufacturing.