Integrated near-field thermo-photovoltaics for heat recycling
Integrated near-field thermo-photovoltaics for heat recycling
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DOI：
10.1038/s41467-020-16197-6
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发表时间：
2020-05-21
影响因子：
16.6
通讯作者：
Lipson, Michal
中科院分区：
文献类型：
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作者：
Bhatt, Gaurang R.;Zhao, Bo;Lipson, Michal
通过热辐射在相隔纳米距离的两个表面之间传递的能量可能远远大于黑体的极限。然而，实现一个利用这种近场能量交换机制发电的可扩展平台仍然是一个挑战。在这里，我们提出了一个完全集成的、可重构和可扩展的平台，它在近场区域运行，执行受控的热提取和能量回收。我们的平台依赖于集成的纳米机电系统，能够在距离室温锗光电探测器几纳米距离内精确定位热发射器，以形成热光电池。我们通过主动地将热发射极(T-E类似于880K)和冷光探测器(T-D类似于300K)之间的间隙从类似于500 nm调到类似于100 nm，证明了我们的热光电池的发电量(P(gen类似于)1.25微瓦厘米(-2))提高了一个数量级以上。我们的纳米机电系统消耗的调谐功率可以忽略不计(P-Gen/P-NEMS类似于10(4))，并且依赖于可扩展的硅基工艺技术。设计一个可扩展的平台，通过相隔纳米距离的两个表面之间的能量交换机制发电，仍然是一个挑战。在这里，作者展示了可重新配置、可扩展和完全集成的近场热光电池，用于按需热回收。
Energy transferred via thermal radiation between two surfaces separated by nanometer distances can be much larger than the blackbody limit. However, realizing a scalable platform that utilizes this near-field energy exchange mechanism to generate electricity remains a challenge. Here, we present a fully integrated, reconfigurable and scalable platform operating in the near-field regime that performs controlled heat extraction and energy recycling. Our platform relies on an integrated nano-electromechanical system that enables precise positioning of a thermal emitter within nanometer distances from a room-temperature germanium photodetector to form a thermo-photovoltaic cell. We demonstrate over an order of magnitude enhancement of power generation (P(gen similar to)1.25 mu Wcm(-2)) in our thermo-photovoltaic cell by actively tuning the gap between a hot-emitter (T-E similar to 880K) and the cold photodetector (T-D similar to 300K) from similar to 500 nm down to similar to 100nm. Our nano-electromechanical system consumes negligible tuning power (P-gen/P-NEMS similar to 10(4)) and relies on scalable silicon-based process technologies. Designing a scalable platform to generate electricity from the energy exchange mechanism between two surfaces separated by nanometer distances remains a challenge. Here, the authors demonstrate reconfigurable, scalable and fully integrated near-field thermo-photovoltaics for on-demand heat recycling.