Ms. Gabriella Hunt Profile

Gabriella Hunt

at Johns Hopkins Univ Applied Physics Lab

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Proceedings Article | 3 October 2022 Presentation + Paper

High emissive contrast of patterned tungsten-doped VO2 thin film composites

G. Hunt, J. Miragliotta, L. Oh, J. Ginn, A. Warren, D. Shrekenhamer

Proceedings Volume 12195, 1219505 (2022) https://doi.org/10.1117/12.2632385

KEYWORDS: Thin films, Composites, Reflectivity, Aluminum, Scanning electron microscopy, Doping, Tungsten

Read Abstract +

Thermal regulation is essential for numerous applications across multiple industries such as the efficient temperature control of indoor facilities and the reliable operation of many electronic systems. Vanadium dioxide (VO₂) is a phase change material that is well-suited for thermal regulation as a result of its ultrafast, reversible, solid-state transition at 68°C that produces a significant contrast in its infrared (IR) emissive properties. To meet application demands, VO₂’s transition temperature can be tuned via doping with a reduction in temperature of ~22 °C per atomic percent tungsten (at. % W⁶⁺). However, historically this decrease in the transition temperature has coincided with a reduction in IR optical contrast between the two phases. In this investigation, we demonstrate that by patterning VO₂ thin film composites with preoptimized thicknesses, a thermal regulation system with a tunable transition temperature and no significant degradation of contrast between the states is produced. Through carefully selected user-defined patterning of the undoped VO₂ layer within the multilayer film, a 64% operating optical contrast was achieved across the 8 – 13 μm spectral region as compared to 42% in the as-deposited film. Additionally, at a doping level of 1.7%, the transition temperature in a VO₂ thin film composite with micron-scaled patterning was reduced to 25°C while maintaining 58% emissive contrast in the 8 – 13 μm spectral region.

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