Solution Casting Effect of PMMA-Based Polymer Electrolyte on the Performances of Solid-State Electrochromic Devices

Area of Science:

• Materials Science
• Electrochemistry
• Solid-State Devices

Background:

• Electrochromic devices (ECDs) change optical properties with voltage.
• Solid-state ECDs require enhanced durability, optical performance, and energy efficiency.
• Polymethylmethacrylate (PMMA)-based electrolytes are crucial for solid-state ECDs.

Purpose of the Study:

• Investigate the impact of casting solution temperature on PMMA-based electrolytes for solid-state ECDs.
• Analyze how varying temperatures affect the performance characteristics of WO3/PMMA-based ECDs.
• Optimize ECD performance by tuning electrolyte preparation conditions.

Main Methods:

• Fabrication of solid-state ECDs with a glass/ITO/WO3/PMMA electrolyte/ITO/glass structure.
• Preparation of PMMA-based electrolytes using lithium perchlorate in propylene carbonate via solution casting.
• Heating electrolyte samples at various temperatures (25, 40, 60, 80, 100 °C) before device assembly.
• Evaluation of device performance, including diffusion, switching time, optical modulation, cycle stability, and coloration efficiency.

Main Results:

• Electrolytes cast at 25 °C showed superior anodic and cathodic diffusion.
• Increased heating temperature led to longer switching times.
• Higher temperature samples (60-100 °C) exhibited excellent cycle stability.
• Elevated temperatures resulted in decreased optical modulation.
• The 100 °C sample demonstrated the highest coloration efficiency.

Conclusions:

• Varying the solution casting temperature of PMMA-based electrolytes significantly impacts solid-state ECD performance.
• Optimizing casting temperature offers a method to balance coloration efficiency, cycle stability, and optical modulation.
• This research provides insights for tailoring PMMA-based electrolytes for specific solid-state ECD applications.