用于自适应热发射的 VO2-ZnS 薄膜腔的生长

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2024-09-20 DOI:10.1063/5.0222653

Raymond Yu, Bo K. Shrewsbury, Claire Wu, Harish Kumarasubramanian, Mythili Surendran, Jayakanth Ravichandran, Michelle L. Povinelli

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引用次数: 0

摘要

航天器在经历各种能量通量时，需要低重量、无源、热适应辐射技术来维持其可操作温度。在这项研究中，我们利用具有法布里-佩罗（Fabry-Pérot，FP）效应的薄膜涂层来增强 VO2 相变态之间的发射率对比（Δε）。这种涂层采用混合材料结构，将 VO2 与中长波红外透明掺杂物硫化锌 (ZnS) 结合在一起，作为空腔间隔层。我们模拟了设计参数空间，获得了 0.63 的理论最大值 Δε，并制作了原型器件。利用 X 射线衍射、拉曼光谱和傅立叶变换红外光谱 (FTIR)，我们确定了在 ZnS 上实现单斜 VO2 结晶生长所需的 TiO2 中间缓冲层。通过随温度变化的傅立叶变换红外光谱测量，我们制造的器件显示出 FP 腔增强的自适应热发射率。

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Growth of VO2-ZnS thin film cavity for adaptive thermal emission

Low-weight, passive, thermal-adaptive radiation technologies are needed to maintain an operable temperature for spacecraft while they experience various energy fluxes. In this study, we used a thin film coating with the Fabry–Pérot (FP) effect to enhance emissivity contrast (Δε) between VO2 phase-change states. This coating utilizes a hybrid material architecture that combines VO2 with a mid- and long-wave infrared transparent chalcogenide, zinc sulfide (ZnS), as a cavity spacer layer. We simulated the design parameter space to obtain a theoretical maximum Δε of 0.63 and grew prototype devices. Using x-ray diffraction, Raman spectroscopy, and Fourier transform infrared spectroscopy (FTIR), we determined that an intermediate buffer layer of TiO2 is necessary to execute the crystalline growth of monoclinic VO2 on ZnS. Through temperature-dependent FTIR measurements, our fabricated devices demonstrated FP-cavity enhanced adaptive thermal emittance.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.