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Proceedings Paper

Low-cost and high-throughput realization of metasurface-based absorber/emitter for thermal-photovoltaic cells
Author(s): Alireza Bonakdar; Mohsen Rezaei; Eric Dexheimer; Hooman Mohseni
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Paper Abstract

A thermal photovoltaic cell (TPV) is an optical heat engine that can extract energy from an emitter with elevated temperature. In theory, the efficiency of a TPV can reach to 80% by wavelength conversion, yet in practice, only 3.2% efficiency has been achieved. The main physical drawback is to maintain the device operation at very high temperature while managing total solar spectrum absorption and efficient coupling of the narrow-band thermal radiation into the photovoltaic cell. In this vein, utilizing of a nanophotonic structure to undergo the wavelength conversion of solar energy is inevitable. Furthermore, low cost, large area and high throughput realization of such a structure brings TPV beyond the research lab. Simultaneous tailoring of UV/visible and mid-infrared spectrums requires sub-100-nm feature size, which is challenging with conventional photolithography if it is not impossible. We have developed a microsphere deep-UV lithography that can produce minimum feature size of ~ 50 nm at extremely low cost and high throughput. In this work, we demonstrate a metasurface platform fabricated with this lithography technique which has omni-polarization and -angle absorption in visible spectrum and efficient emission at mid-infrared as confirmed both by FDTD simulation and Fourier transform infrared spectroscopy (FTIR) measurement. The developed technique is promising technology to expedite TPV in real-life energy harvesting applications.

Paper Details

Date Published: 28 August 2015
PDF: 6 pages
Proc. SPIE 9547, Plasmonics: Metallic Nanostructures and Their Optical Properties XIII, 954725 (28 August 2015); doi: 10.1117/12.2189232
Show Author Affiliations
Alireza Bonakdar, Northwestern Univ. (United States)
Mohsen Rezaei, Northwestern Univ. (United States)
Eric Dexheimer, Northwestern Univ. (United States)
Hooman Mohseni, Northwestern Univ. (United States)

Published in SPIE Proceedings Vol. 9547:
Plasmonics: Metallic Nanostructures and Their Optical Properties XIII
Allan D. Boardman; Din Ping Tsai, Editor(s)

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