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首页> 外文期刊>International Journal of Heat and Mass Transfer >Selectively enhanced near-field radiative transfer between plasmonic emitter and GaSb with nanohole and nanowire periodic arrays for thermophotovoltaics
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Selectively enhanced near-field radiative transfer between plasmonic emitter and GaSb with nanohole and nanowire periodic arrays for thermophotovoltaics

机译：带有纳米孔和纳米线周期性阵列的等离子发射体与GaSb之间选择性增强的近场辐射传递，用于热光电

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摘要

To design a nano-gap thermophotovoltaic device with selectively enhanced radiative transfer above the cell's bandgap, this work theoretically investigated the near-field radiative transfer from a plasmonic Drude emitter to a nanostructured GaSb absorber, with a finite-thickness surface layer of nanowire or nanohole arrays, across a 200 nm vacuum gap. The Fourier Modal method (FMM) is used to rigorously characterize the radiative transfer involving diffractive periodic structures. The results showed that the added nanostructure, especially nanowires, effectively and selectively enhanced the near-field radiative transfer above the bandgap, with a maximum of three times the spectral radiative heat flux when compared to the unstructured GaSb case. By considering periodic structures in two dimensions, this work revealed the difference between the nanowire and nanohole absorbers in manipulating of the radiative heat flux, showing that the nanowire array offers largely enhanced radiative heat transfer compared with the nanohole arrays with similar geometric parameters, which cannot be quantitatively characterized by effective medium theories even though the structural size is much smaller than the studied wavelength. The results proved that nanohole and nanowire structures can be used to significantly enhance the power and efficiency of a nano-gap thermophotovoltaic device, for which the equivalent of anti-reflection structures of the semiconductor cells have seldom been studied. (C) 2018 Elsevier Ltd. All rights reserved.
机译：为了设计一种能在单元带隙上方选择性增强辐射传递的纳米间隙热光电器件，这项工作从理论上研究了从等离子体Drude发射器到纳米结构GaSb吸收体的近场辐射传递，并具有有限厚度的纳米线或纳米孔表面层。阵列，在200 nm的真空间隙内。傅里叶模态方法（FMM）用于严格表征涉及衍射周期结构的辐射传递。结果表明，添加的纳米结构，特别是纳米线，有效地和选择性地增强了带隙上方的近场辐射传递，与非结构化GaSb情况相比，光谱辐射热通量最大为三倍。通过考虑二维的周期性结构，这项工作揭示了纳米线和纳米孔吸收体在控制辐射热通量方面的差异，表明与具有相似几何参数的纳米孔阵列相比，纳米线阵列提供了大大增强的辐射热传递。即使结构尺寸远小于所研究的波长，也可以通过有效的介质理论对其进行定量表征。结果证明，纳米孔和纳米线结构可用于显着提高纳米间隙热光电器件的功率和效率，为此，很少研究半导体电池的抗反射结构。 （C）2018 Elsevier Ltd.保留所有权利。

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