Improved Omnidirectional 2D Photonic Crystal Selective Emitter for Thermophotovoltaics
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Sakakibara_2018_J._Phys.__Conf._Ser._1052_012056.pdf
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Author(s)
Sakakibara, Reyu
Stelmakh, Veronika
Chan, Walker R
Ghebrebrhan, Michael
Joannopoulos, John
Soljacic, Marin
Celanovic, Ivan L.
Date Issued
2018
Journal
Journal of Physics: Conference Series
Publisher
IOP Publishing
Citation
Sakakibara, Reyu et al. “Improved Omnidirectional 2D Photonic Crystal Selective Emitter for Thermophotovoltaics.” Journal of Physics: Conference Series 1052 (July 2018): 012056 © 2018 Publisher
Version
Final published version
Abstract
Hafnia-filled, two dimensional (2D) tantalum (Ta) photonic crystals (PhCs) are promising emitters for high performance thermophotovoltaic (TPV) systems because they enable, for a wide range of incidence angles, efficient spectral tailoring of thermal radiation. However, fabricating these PhCs to the required tolerances has proven to be a challenging task. In this paper, we use both focused ion beam (FIB) imaging and simulations to investigate the effects of fabrication imperfections on the emittance of a fabricated hafnia-filled PhC and to identify critical geometric features that drive the overall PhC performance. We demonstrate that, more so than uniform cavity filling, the key to the best filled PhC performance is the precise cavity period and radius values and thickness of the top hafnia layer.
MIT Department
Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution 3.0 unported license
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DOI of Published Version
https://doi.org/10.1088/1742-6596/1052/1/012056
