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Compositional Optimization of Sputtered WO₃/MoO₃ Films for High Coloration Efficiency.

Zoltán Lábadi¹, Dániel Takács^1,2, Zsolt Zolnai¹

¹Institute of Technical Physics & Materials Science, Centre for Energy Research, Konkoly-Thege Rd. 29-33, H-1121 Budapest, Hungary.

Materials (Basel, Switzerland)

|March 13, 2024

Summary

Researchers optimized mixed molybdenum trioxide (MoO3) and tungsten trioxide (WO3) thin films for superior electrochromic (EC) properties. A combinatorial approach identified the ideal MoO3/WO3 composition for enhanced coloration efficiency.

Keywords:

coloration efficiency combinatorial sputtering electrochromic materials reactive sputtering tungsten–molybdenum oxide

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Area of Science:

Materials Science
Nanotechnology
Electrochemistry

Background:

Mixed metal oxides, such as molybdenum trioxide (MoO3) and tungsten trioxide (WO3), are promising materials for electrochromic (EC) devices.
Optimizing the composition of these mixed oxides is crucial for achieving desired EC performance.

Purpose of the Study:

To determine the optimal composition of mixed MoO3 and WO3 thin films for the best electrochromic properties.
To investigate the electrochromic characteristics of the full composition range of the binary MoO3/WO3 system.

Main Methods:

Thin films of mixed MoO3 and WO3 were fabricated using reactive magnetron sputtering onto ITO-covered glass.
A combinatorial material synthesis approach was employed to cover the entire composition range.
Electrochromic properties were evaluated by measuring transmittance and current in an organic electrolyte cell.

Main Results:

The study identified a characteristic maximum in coloration efficiency at approximately 60% MoO3.
The combinatorial approach enabled precise localization of this optimal composition with 5% accuracy.
Mixed MoO3/WO3 thin films exhibited significant electrochromic behavior.

Conclusions:

The optimal composition for enhanced electrochromic performance in MoO3/WO3 thin films was determined to be around 60% MoO3.
Combinatorial synthesis is an effective strategy for rapidly identifying optimal material compositions for electrochromic applications.
Further research can leverage these findings for developing advanced EC devices.