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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
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Gradient Variation Oxygen-Content Vanadium-Oxygen Composite Films with Enhanced Crystallinity and Excellent
Zhongshao Li1,2, Cuicui Cao2,3, Ming Li2,3
1School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China.
ACS Applied Materials & Interfaces
|February 8, 2023
Summary
Gradient vanadium oxide films offer improved energy efficiency for smart windows. This new material enhances solar modulation and durability, paving the way for commercialization of thermochromic windows.
Area of Science:
- Materials Science
- Nanotechnology
- Energy
Background:
- Vanadium dioxide (VO2) smart windows are promising for energy savings but face challenges in manufacturing, crystalline homogeneity, and stability.
- Existing multilayer structures improve properties but involve complex and costly fabrication processes.
Purpose of the Study:
- To develop a durable, high-performance vanadium oxide film for thermochromic smart windows using a simplified, industry-compatible process.
- To overcome the limitations of traditional VO2 films, such as poor solar modulation and narrow hysteresis loops.
Main Methods:
- Preparation of gradient oxygen-content vanadium-oxygen composite films (V2O3/VO2/V2O5, VOgv) via one-step continuous sputtering.
- Optical measurements to evaluate solar modulation (ΔTsol) and hysteresis loop width.
- Accelerated aging tests to assess durability and service life.
Main Results:
- The VOgv films exhibited a 145% increase in ΔTsol (from 6.85% to 16.80%) compared to pure VO2 films.
- The hysteresis loop width was reduced by 67% (from 19.34 °C to 6.36 °C), indicating enhanced sensitivity.
- Accelerated tests demonstrated an equivalent service life of approximately 20 years, with a wider preparation window.
Conclusions:
- Gradient vanadium-oxygen films offer significantly enhanced thermochromic properties and durability compared to traditional VO2 films.
- The simplified one-step sputtering process simplifies manufacturing, potentially overcoming commercialization bottlenecks for VO2-based smart windows.
