Terbium-Doped VO2 Thin Films: Reduced Phase Transition Temperature and Largely Enhanced Luminous Transmittance

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• 作者：Ning Wang ; Martial Duchamp ; Rafal E. Dunin-Borkowski ; Shiyu Liu ; XianTing Zeng ; Xun Cao ; Yi Long
• 刊名：Langmuir
• 出版年：2016
• 出版时间：January 26, 2016
• 年：2016
• 卷：32
• 期：3
• 页码：759-764
• 全文大小：415K
• ISSN：1520-5827

文摘

Vanadium dioxide (VO₂) is a well-known thermochromic material with large IR modulating ability, promising for energy-saving smart windows. The main drawbacks of VO₂ are its high phase transition temperature (τ_c = 68 °C), low luminous transmission (T_lum), and weak solar modulating ability (ΔT_sol). In this paper, the terbium cation (Tb³⁺) doping was first reported to reduce τ_c and increase T_lum of VO₂ thin films. Compared with pristine VO₂, 2 at. % doping level gives both enhanced T_lum and ΔT_sol from 45.8% to 54.0% and 7.7% to 8.3%, respectively. The T_lum increases with continuous Tb³⁺ doping and reaches 79.4% at 6 at. % doping level, representing ～73.4% relative increment compared with pure VO₂. This has surpassed the best reported doped VO₂ thin films. The enhanced thermochromic properties is meaningful for smart window applications of VO₂ materials.