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### Journal of Photonics for Energy

Near-field thermophotovoltaic system design and calculation based on coupled-mode analysis
Author(s): Bingnan Wang; Chungwei Lin; Koon Hoo Teo
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Paper Abstract

The coupling of resonant modes between two surfaces is important in near-field heat transfer and near-field thermophotovoltaic (TPV) systems. Recently, coupled-mode theory (CMT) has been developed for the analysis and optimal design of TPV systems. We use CMT to analyze the “emitter-vacuum-PV cell” configuration and quantitatively show how the emitter of a nanostructure can drastically improve the near-field TPV device performance. The key feature of the nanostructure is the additional geometry-induced resonant mode, whose energy is lower than the original surface plasmon polariton resonant frequency and much closer to the bandgap of the PV cell. Specifically, we show that, with a simple grating structure, the generated power density of a TPV cell is increased from 13 to $34 W / cm 2$ when the PV cell is fixed at 300 K and the emitter is at 1000 K. The increase is over 20 times higher when both planar and grating emitters are at a lower temperature of 500 K.

Paper Details

Date Published: 27 October 2017
PDF: 8 pages
J. Photon. Energy 7(4) 044501 doi: 10.1117/1.JPE.7.044501
Published in: Journal of Photonics for Energy Volume 7, Issue 4
Show Author Affiliations
Bingnan Wang, Mitsubishi Electric Research Labs. (United States)
Chungwei Lin, Mitsubishi Electric Research Labs. (United States)
Koon Hoo Teo, Mitsubishi Electric Research Labs. (United States)