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Integrated near-field thermo-photovoltaics for heat recycling

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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… Click to show full abstract

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  ~ 1.25 μWcm −2 ) in our thermo-photovoltaic cell by actively tuning the gap between a hot-emitter ( T E  ~ 880 K) and the cold photodetector ( T D  ~ 300 K) from ~ 500 nm down to ~ 100 nm. Our nano-electromechanical system consumes negligible tuning power ( P gen / P NEMS ~ 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.

Keywords: field thermo; field; near field; heat; integrated near

Journal Title: Nature Communications
Year Published: 2020

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