Performance enhancement of a thin film tungsten oxide based solid-state electrochromic device
Electrochromic devices for emissivity modulation hold immense promise for applications such as thermal management, dynamic optics, and radiative cooling. However, conventional all-solid-state electrochromic devices often suffer from slow switching speeds, limited optical contrast, and challenges in...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
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| Series: | Materials Research Express |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2053-1591/adf8c6 |
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| Summary: | Electrochromic devices for emissivity modulation hold immense promise for applications such as thermal management, dynamic optics, and radiative cooling. However, conventional all-solid-state electrochromic devices often suffer from slow switching speeds, limited optical contrast, and challenges in scalable fabrication. In this article, we report on the development and optimization of a high performance all-solid-state electrochromic device that addresses these limitations. The device exhibits significantly faster switching times of 8.2 s (coloring) and 3.1 s (bleaching), compared to the typical switching times of ∼20 s to a few minutes reported for similar solid-state electrochromic devices, marking a key advancement in emissivity modulation technology. Constructed using a stack of thin films—Au/NiO/Ta _2 O _5 /WO _3 /ITO—fabricated through RF magnetron sputtering, the device’s layers were meticulously optimized to reduce resistance while preserving essential optical properties. The device demonstrated a maximum reflectance modulation of about 50%–60% across a broad wavelength range from the visible to the infrared. Its all-solid-state thin-film construction ensures robust performance under high-temperature conditions, demonstrating potential for long-term stability and scalability in practical applications. These advancements position solid-state emissivity control devices as scalable and energy-efficient solutions for dynamic optics, thermal management, and emissivity-based radiative cooling. |
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| ISSN: | 2053-1591 |