Nano‐gap TPV Generation of Electricity through Evanescent Wave in Near‐field Above Emitter Surface
Nano‐gap TPV Generation of Electricity through Evanescent Wave in Near‐field Above Emitter Surface
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DOI：
10.1063/1.2711747
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发表时间：
2007-03
期刊：
影响因子：
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通讯作者：
K. Hanamura;K. Mori
中科院分区：
文献类型：
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作者：
K. Hanamura;K. Mori
纳米间隙热光伏（Nano Gap TPV）发电通过仅存在于发射器表面上方的近场中的倏逝波进行了实验研究，使用GaSb电池。通过电池，波长小于1.8μm的辐射被转换为电能。随着发射器和电池表面之间的间隙减小，输出功率首先增加，然后保持恒定，因为传播辐射的视角因子变得接近于1。当间隙从约3μm进一步减小时，长波长辐射的倏逝效应变得显著，导致仅增强从发射器到电池的热传递。而在差距小于1μm的情况下，输出功率随间距的减小而增大，即波长小于1.8μm的倏逝波对发电有贡献。
Nano‐gap thermophotovoltaic (Nano‐Gap TPV) generation of electricity through evanescent wave existing only in a near‐field above an emitter surface has been investigated experimentally using a GaSb cell. Through the cell, radiation with wavelength less than 1.8μm is converted into electricity. With decreasing gap between the emitter and cell surfaces, the output power, first increases, and then is maintained at constant since the view factor for the propagating radiation becomes close to unity. On further decrease in gap from about 3μm, evanescent effect for long wavelength radiation becomes remarkable, resulting in enhancement only of heat transfer from the emitter to the cell. However, under the condition of the gap less than 1μm, the output power increases with decreasing gap; that is, the evanescent wave for wavelength less than 1.8μm contributes to generation of electricity.