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Tuning Phase Transition and Thermochromic Properties of Vanadium Dioxide Thin Films via Cobalt Doping

Journal Article


Abstract


  • Vanadium dioxide (VO2) featuring a distinct thermally triggered phase transition is regarded as the most attractive thermochromic material for smart window applications. However, the high transition temperature (?67 °C) and moderate luminous transmittance (<50%) of the pristine VO2 circumvent room temperature applications. In this work, epitaxial cobalt-doped VO2 thin films were fabricated to tailor the electric and optical properties on a c-plane sapphire substrate. At the highest doping concentration of 10%, the transition temperature of VO2 is reduced to 44 °C, accompanied by a high luminous transmittance of 79% for single-element Co-doped VO2. The roles of cobalt doping and detailed band variation are fully explained experimentally and by modeling (DFT calculation), respectively. Furthermore, the dramatically increased carrier concentration in cobalt-doped VO2 underscores the promising future of cobalt-doped VO2 unveiled by temperature-dependent Hall effect measurement.

Publication Date


  • 2022

Citation


  • Geng, X., Chang, T., Fan, J., Wang, Y., Wang, X., Sun, Y., . . . Wu, T. (2022). Tuning Phase Transition and Thermochromic Properties of Vanadium Dioxide Thin Films via Cobalt Doping. ACS Applied Materials and Interfaces, 14(17), 19736-19746. doi:10.1021/acsami.2c03113

Scopus Eid


  • 2-s2.0-85129560656

Start Page


  • 19736

End Page


  • 19746

Volume


  • 14

Issue


  • 17

Abstract


  • Vanadium dioxide (VO2) featuring a distinct thermally triggered phase transition is regarded as the most attractive thermochromic material for smart window applications. However, the high transition temperature (?67 °C) and moderate luminous transmittance (<50%) of the pristine VO2 circumvent room temperature applications. In this work, epitaxial cobalt-doped VO2 thin films were fabricated to tailor the electric and optical properties on a c-plane sapphire substrate. At the highest doping concentration of 10%, the transition temperature of VO2 is reduced to 44 °C, accompanied by a high luminous transmittance of 79% for single-element Co-doped VO2. The roles of cobalt doping and detailed band variation are fully explained experimentally and by modeling (DFT calculation), respectively. Furthermore, the dramatically increased carrier concentration in cobalt-doped VO2 underscores the promising future of cobalt-doped VO2 unveiled by temperature-dependent Hall effect measurement.

Publication Date


  • 2022

Citation


  • Geng, X., Chang, T., Fan, J., Wang, Y., Wang, X., Sun, Y., . . . Wu, T. (2022). Tuning Phase Transition and Thermochromic Properties of Vanadium Dioxide Thin Films via Cobalt Doping. ACS Applied Materials and Interfaces, 14(17), 19736-19746. doi:10.1021/acsami.2c03113

Scopus Eid


  • 2-s2.0-85129560656

Start Page


  • 19736

End Page


  • 19746

Volume


  • 14

Issue


  • 17