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Enhanced Durability and Antireflective Performance of Ag-Based Transparent Conductors Achieved via Controlled
Phillip Rumsby1, Bill Baloukas1, Oleg Zabeida1
1Department of Engineering Physics, Polytechnique Montreal, Montreal, QC H3T 1J7, Canada.
ACS Applied Materials & Interfaces
|April 27, 2024
Summary
This study enhances silver-based transparent conductors (TCs) by optimizing antireflective properties and improving environmental durability. A novel combination of sputtering conditions and seed layers significantly boosts TC stability against corrosion.
Area of Science:
- Materials Science
- Optoelectronics
- Thin Film Technology
Background:
- Silver-based transparent conductors (TCs) offer an alternative to indium tin oxide (ITO) but often suffer from poor environmental durability.
- Existing methods to improve durability typically rely on specialized encapsulating layers, limiting broader applicability.
Purpose of the Study:
- To simultaneously enhance the environmental durability and antireflective performance of silver-based TCs.
- To establish general requirements for optimizing TC stack performance and durability.
Main Methods:
- Utilized a transfer matrix modeling approach to guide antireflective property optimization based on silver thickness and dielectric refractive indices.
- Investigated coating durability by modifying the silver microstructure through nitrogen (N₂) doping concentration and seed layer selection (Si₃N₄ vs. Al-doped ZnO).
- Incorporated nickel-chromium nitride (NiCrN) protective coatings to further enhance system durability.
Main Results:
- Optimized antireflective properties were achieved by tuning silver thickness and dielectric layers.
- Significantly enhanced durability was observed with intermediate N₂ concentrations (5%) during Ag deposition and an Al-doped ZnO seed layer.
- Ag-based TCs fabricated with optimized conditions (89.2% transmittance, 0.23% reflectance, 21.4 Ω/sq) exhibited minimal property changes after immersion in a harsh saline solution (200 g/L NaCl at 50 °C).
Conclusions:
- Simultaneous enhancement of antireflective performance and environmental durability in Ag-based TCs is achievable through careful control of deposition parameters and material selection.
- The proposed method provides a more widely applicable strategy for optimizing Ag-based TCs compared to specialized encapsulation.
- The developed Ag-based TCs demonstrate high performance and robust stability, making them promising for various optoelectronic applications.
