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Enhancing solar-thermal energy conversion with silicon-cored tungsten nanowire selective metamaterial absorbers.

Authors
  • Chang, Jui-Yung1, 2, 3
  • Taylor, Sydney1
  • McBurney, Ryan1
  • Ying, Xiaoyan1
  • Allu, Ganesh2
  • Chen, Yu-Bin3, 4
  • Wang, Liping1
  • 1 School for Engineering of Matter, Transport & Energy, Arizona State University, Tempe, AZ 85287, USA.
  • 2 Department of Mechanical Engineering, National Chiao Tung University, Hsinchu 300, Taiwan. , (Taiwan)
  • 3 Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu 300, Taiwan. , (Taiwan)
  • 4 Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan. , (Taiwan)
Type
Published Article
Journal
iScience
Publication Date
Jan 22, 2021
Volume
24
Issue
1
Pages
101899–101899
Identifiers
DOI: 10.1016/j.isci.2020.101899
PMID: 33364587
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

This work experimentally studies a silicon-cored tungsten nanowire selective metamaterial absorber to enhance solar-thermal energy harvesting. After conformally coating a thin tungsten layer about 40 nm thick, the metamaterial absorber exhibits almost the same total solar absorptance of 0.85 as the bare silicon nanowire stamp but with greatly reduced total emittance down to 0.18 for suppressing the infrared emission heat loss. The silicon-cored tungsten nanowire absorber achieves an experimental solar-thermal efficiency of 41% at 203°C during the laboratory-scale test with a stagnation temperature of 273°C under 6.3 suns. Without parasitic radiative losses from side and bottom surfaces, it is projected to reach 74% efficiency at the same temperature of 203°C with a stagnation temperature of 430°C for practical application, greatly outperforming the silicon nanowire and black absorbers. The results would facilitate the development of metamaterial selective absorbers at low cost for highly efficient solar-thermal energy systems. © 2020 The Author(s).

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