Hongli Sun , Danke Chen , Liwei Zhou , Wei Mi , Di Wang , Linan He , Jinshi Zhao
{"title":"掺杂 Ta 和抗反射 TaOx 层对用于智能窗户的热致变色 VO2 薄膜的协同效应","authors":"Hongli Sun , Danke Chen , Liwei Zhou , Wei Mi , Di Wang , Linan He , Jinshi Zhao","doi":"10.1016/j.solmat.2024.113010","DOIUrl":null,"url":null,"abstract":"<div><p>Current efforts to promote the use of VO<sub>2</sub> materials as a promising candidate for thermochromic smart windows continue to be hindered by the low luminous transmittance (<em>T</em><sub>lum</sub>), the limited solar modulation ability (Δ<em>T</em><sub>sol</sub>), the high phase transition temperature (<em>T</em><sub>t</sub>, ∼68 °C) and the wide thermal hysteresis (Δ<em>T</em>). The present work addresses these issues by fabricating an antireflective TaO<sub>x</sub> layer on the Ta-doped VO<sub>2</sub> (i.e., VO<sub>2</sub>(Ta)) thin films. The VO<sub>2</sub>(4.35 at% Ta) thin films with low <em>T</em><sub>t</sub> of 29.87 °C and narrowed Δ<em>T</em> of almost zero were grown on glass substrates by magnetron sputtering at room temperature followed by rapid thermal annealing. However, the VO<sub>2</sub>(Ta) thin films show slightly enhanced <em>T</em><sub>lum</sub> of 38.31 % compared with undoped VO<sub>2</sub> films (35.46 %) and decreased the Δ<em>T</em><sub>sol</sub> by 1.83 %. The thermochromic properties are further enhanced by depositing the antireflective TaO<sub>x</sub> layer onto the VO<sub>2</sub>(Ta) thin film by reactive magnetron sputtering, which significantly increases the <em>T</em><sub>lum</sub> from 38.31 % to 48.58 %, marginally decreases the Δ<em>T</em><sub>sol</sub> from 4.44 % to 4.12 %, and maintain the <em>T</em><sub>t</sub> and Δ<em>T</em> constant. These results verify the possibility of developing VO<sub>2</sub> films with simultaneously increased optical transmittance, decreased <em>T</em><sub>t</sub> to suitable values, and extremely narrow Δ<em>T</em> by using the synergistic effect of element doping and constructing an antireflective layer.</p></div>","PeriodicalId":429,"journal":{"name":"Solar Energy Materials and Solar Cells","volume":null,"pages":null},"PeriodicalIF":6.3000,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"The synergistic effect of Ta-doping and antireflective TaOx layer on the thermochromic VO2 thin films for smart windows\",\"authors\":\"Hongli Sun , Danke Chen , Liwei Zhou , Wei Mi , Di Wang , Linan He , Jinshi Zhao\",\"doi\":\"10.1016/j.solmat.2024.113010\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Current efforts to promote the use of VO<sub>2</sub> materials as a promising candidate for thermochromic smart windows continue to be hindered by the low luminous transmittance (<em>T</em><sub>lum</sub>), the limited solar modulation ability (Δ<em>T</em><sub>sol</sub>), the high phase transition temperature (<em>T</em><sub>t</sub>, ∼68 °C) and the wide thermal hysteresis (Δ<em>T</em>). The present work addresses these issues by fabricating an antireflective TaO<sub>x</sub> layer on the Ta-doped VO<sub>2</sub> (i.e., VO<sub>2</sub>(Ta)) thin films. The VO<sub>2</sub>(4.35 at% Ta) thin films with low <em>T</em><sub>t</sub> of 29.87 °C and narrowed Δ<em>T</em> of almost zero were grown on glass substrates by magnetron sputtering at room temperature followed by rapid thermal annealing. However, the VO<sub>2</sub>(Ta) thin films show slightly enhanced <em>T</em><sub>lum</sub> of 38.31 % compared with undoped VO<sub>2</sub> films (35.46 %) and decreased the Δ<em>T</em><sub>sol</sub> by 1.83 %. The thermochromic properties are further enhanced by depositing the antireflective TaO<sub>x</sub> layer onto the VO<sub>2</sub>(Ta) thin film by reactive magnetron sputtering, which significantly increases the <em>T</em><sub>lum</sub> from 38.31 % to 48.58 %, marginally decreases the Δ<em>T</em><sub>sol</sub> from 4.44 % to 4.12 %, and maintain the <em>T</em><sub>t</sub> and Δ<em>T</em> constant. 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引用次数: 0
摘要
由于 VO 材料的透光率低()、太阳调制能力有限(Δ)、相变温度高(∼68 °C)和热滞后大(Δ),目前推广使用 VO 材料作为热致变色智能窗的候选材料的努力仍然受到阻碍。本研究通过在掺杂 Ta 的 VO(即 VO(Ta))薄膜上制造抗反射 TaO 层来解决这些问题。通过磁控溅射法在室温下在玻璃基底上生长出 VO(4.35 at% Ta) 薄膜,其温度低至 29.87 °C,Δ几乎为零。然而,与未掺杂的 VO 薄膜(35.46%)相比,VO(Ta) 薄膜的温度略微升高了 38.31%,Δ 则降低了 1.83%。通过反应磁控溅射在 VO(Ta)薄膜上沉积抗反射的 TaO 层,热致变色特性得到了进一步增强,使 VO(Ta)薄膜的热致变色特性从 38.31% 显著提高到 48.58%,Δ 从 4.44% 略微降低到 4.12%,并保持和 Δ 不变。这些结果验证了利用元素掺杂和构建抗反射层的协同效应,开发出同时具有更高的光学透过率、更低的合适值和更窄的Δ的 VO 薄膜的可能性。
The synergistic effect of Ta-doping and antireflective TaOx layer on the thermochromic VO2 thin films for smart windows
Current efforts to promote the use of VO2 materials as a promising candidate for thermochromic smart windows continue to be hindered by the low luminous transmittance (Tlum), the limited solar modulation ability (ΔTsol), the high phase transition temperature (Tt, ∼68 °C) and the wide thermal hysteresis (ΔT). The present work addresses these issues by fabricating an antireflective TaOx layer on the Ta-doped VO2 (i.e., VO2(Ta)) thin films. The VO2(4.35 at% Ta) thin films with low Tt of 29.87 °C and narrowed ΔT of almost zero were grown on glass substrates by magnetron sputtering at room temperature followed by rapid thermal annealing. However, the VO2(Ta) thin films show slightly enhanced Tlum of 38.31 % compared with undoped VO2 films (35.46 %) and decreased the ΔTsol by 1.83 %. The thermochromic properties are further enhanced by depositing the antireflective TaOx layer onto the VO2(Ta) thin film by reactive magnetron sputtering, which significantly increases the Tlum from 38.31 % to 48.58 %, marginally decreases the ΔTsol from 4.44 % to 4.12 %, and maintain the Tt and ΔT constant. These results verify the possibility of developing VO2 films with simultaneously increased optical transmittance, decreased Tt to suitable values, and extremely narrow ΔT by using the synergistic effect of element doping and constructing an antireflective layer.
期刊介绍:
Solar Energy Materials & Solar Cells is intended as a vehicle for the dissemination of research results on materials science and technology related to photovoltaic, photothermal and photoelectrochemical solar energy conversion. Materials science is taken in the broadest possible sense and encompasses physics, chemistry, optics, materials fabrication and analysis for all types of materials.