4.6 Article

The optimization and role of Ti surface doping in thermochromic VO2 film

期刊

OPTICAL MATERIALS
卷 133, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.optmat.2022.112960

关键词

VO2-based smart window; Ti surface doping; Thermochromic properties; RTA

资金

  1. National Natural Science Foundation of China [62004140]
  2. Major Project of Tianjin Science and Technology [18ZXJMTG00230, 18YFYSZC00180]
  3. Natural Science Foundation of Tianjin [14JCZDJC31500, 18JCQNJC72700]
  4. Science and Technology Development Fund Program of Universities of Tianjin [2017KJ250]
  5. Leading academic talents in Tianjin
  6. innovative talents promotion plan in Tianjin [2020TD003]

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Ti surface-doped VO2 films were prepared on plain glass using rapid thermal annealing, aiming to enhance the thermochromic properties of VO2 films. The addition of Ti resulted in smaller, more uniform surface particles, leading to a lower transition temperature and a narrower hysteresis width. Additionally, the optical band gap widening led to a significant increase in luminous transmittance. This convenient surface engineering method offers a new strategy for optimizing the performance of smart windows.
In the present task, Ti surface-doped VO2 films have been prepared by rapid thermal annealing of (ultra-thin)Ti/ V metal films on plain glass in order to improve the unbalanced thermochromic properties of VO2 films. The samples were analyzed for composition, crystallinity, surface topography, and optical properties. As the Ti content increases, the surface particles become smaller and more uniform, resulting in a lower transition tem-perature of 44.9? and an extremely narrow hysteresis width of 2.36?. Meanwhile, a significant increase in luminous transmittance (from 28.4% to 39.6%) accompanies the optical band gap widening. The convenient method of surface engineering provides a new strategy for the performance optimization of smart windows.

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