Enhancing visible-light transmittance while reducing phase transition temperature of VO2 by Hf–W co-doping

In order to enhance the visible-light transmittance while reducing the insulator–metal transition (IMT) temperature, Hf–W co-doping is designed for modification of VO2. We grow high-quality HfxWyV1−x−yO2 (HfWVO2) alloy films on c-plane sapphire substrates by pulsed laser deposition, and test structu...

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Veröffentlicht in:Applied physics letters 2021-05, Vol.118 (19), Article 192102
Hauptverfasser: Wang, Xinru, Chen, Lufeng, Lu, Hao, Fang, Wenyu, Li, Hao, Yin, Weiling, Li, Mingkai, Lu, Yinmei, Li, Pai, He, Yunbin
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Sprache:eng
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Zusammenfassung:In order to enhance the visible-light transmittance while reducing the insulator–metal transition (IMT) temperature, Hf–W co-doping is designed for modification of VO2. We grow high-quality HfxWyV1−x−yO2 (HfWVO2) alloy films on c-plane sapphire substrates by pulsed laser deposition, and test structural, electrical, and optical properties of the films by various techniques. The Hf–W co-doped VO2 films exhibit outstanding thermochromic performances with a high luminous transmittance up to 41.1%, a fairly good near-infrared modulation capacity of 13.1%, and a low phase transition temperature of 38.9 °C. The enhanced luminous transmittance along with reduced IMT temperature in HfWVO2 is attributed to the co-doping synergetic effect of Hf and W, which effectively improves the optical bandgap and donates extra electrons into the system, respectively, while largely retaining the near-infrared modulation capacity of VO2. Our work provides an effective strategy in tailoring VO2 toward practical smart-coating applications by Hf–W co-doping.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0044516