Thin-Film Radiative Thermal Diode with Large Rectification,Physical Review Applied

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Thin-Film Radiative Thermal Diode with Large Rectification
Physical Review Applied ( IF 3.8 ) Pub Date : 2021-07-30 , DOI: 10.1103/physrevapplied.16.014069
Qizhang Li _{1,

2} , Haiyu He _{1,

3} , Qun Chen ₂ , Bai Song _{1,

3,

4}

Affiliation

We propose a mechanism to substantially rectify radiative heat flow by having one side of the thermal diode offering a large contrast in the local density of electromagnetic states, while the opposite side serving as a narrow bandpass filter that limits the transport to a desired spectral range. To demonstrate, we realize such a scenario by matching thin films of metal-to-insulator transition materials and polar dielectrics in the near field. By leveraging the distinct scaling behaviors of the local density of states with film thickness for metals and insulators, we theoretically achieve rectification ratios over 140, a 10-fold improvement over the state of the art, with nanofilms of vanadium dioxide and cubic boron nitride in the parallel-plane geometry at experimentally feasible gap sizes (∼100 nm). Our rational design offers relative ease of fabrication, flexible choice of materials, and robustness against deviations from optimal film thicknesses. We expect this work to facilitate the application of thermal diodes in solid-state thermal circuits and energy-conversion devices.

中文翻译：

具有大整流的薄膜辐射热二极管

我们提出了一种机制，通过使热二极管的一侧在电磁状态的局部密度方面提供大的对比度，而另一侧用作将传输限制到所需光谱范围的窄带通滤波器，从而显着纠正辐射热流。为了演示，我们通过在近场中匹配金属到绝缘体过渡材料的薄膜和极性电介质来实现这种情况。通过利用金属和绝缘体膜厚的局部状态密度的不同缩放行为，我们理论上实现了超过 140 的整流比，比现有技术提高了 10 倍，其中二氧化钒和立方氮化硼的纳米膜在实验上可行的间隙尺寸（~100 nm）的平行平面几何形状。我们的合理设计提供相对容易的制造、灵活的材料选择以及对偏离最佳薄膜厚度的稳健性。我们希望这项工作能够促进热二极管在固态热电路和能量转换设备中的应用。

更新日期：2021-08-01

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