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

G. M. Hunt; J. A. Miragliotta; L. Oh; J. Ginn; A. Warren; D. B. Shrekenhamer

doi:10.1117/12.2632385

3 October 2022 High emissive contrast of patterned tungsten-doped VO₂ thin film composites

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

Proceedings Volume 12195, Metamaterials, Metadevices, and Metasystems 2022; 1219505 (2022) https://doi.org/10.1117/12.2632385
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States

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.

Conference Presentation

Citation Download Citation

G. M. Hunt, J. A. Miragliotta, L. Oh, J. Ginn, A. Warren, and D. B. Shrekenhamer "High emissive contrast of patterned tungsten-doped VO₂ thin film composites", Proc. SPIE 12195, Metamaterials, Metadevices, and Metasystems 2022, 1219505 (3 October 2022); https://doi.org/10.1117/12.2632385

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