4.5 Article

Ultra-broadband metamaterial absorber for high solar thermal energy conversion efficiency

Journal

PHYSICA B-CONDENSED MATTER
Volume 620, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.physb.2021.413261

Keywords

Metamaterial absorber; Cross-shape; Broadband absorption; Solar-to-thermal conversion efficiency

Funding

  1. National Research Foundation (NRF) [2019R1A2B5B01069580, 2019R1A6A1A09031717, 2019H1A2A1074764]
  2. Ministry of Trade, Industry, and Energy [20011031]
  3. National Research Foundation of Korea [2019H1A2A1074764] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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This paper presents a titanium cross-shaped based-metamaterial absorber in the visible and near-infrared regions, enabling high broadband absorption and solar-thermal conversion efficiency. The structure achieves high absorption rates for both TE and TM polarizations, as well as high solar thermal conversion efficiency over a wide temperature range.
In this paper, a titanium cross-shaped based-metamaterial absorber in the visible and near-infrared regions is presented. The proposed solar thermal absorber consists of a cross-shaped titanium/SiO2 spacer/TiN ground film structure enabling high broadband absorption and solar-thermal conversion efficiency. The broadband nearperfect absorption spectra with the proposed structure reach 97% for both TE and TM-polarization in the wavelength ranges of (from 386 to 1178 nm) and (from 300 to 1140 nm), respectively. Furthermore, the proposed structure exhibits a high solar thermal conversion efficiency of 96% under continuously variable of C from 1 to 1000, maintained over the wide operating temperature range 373-779 K. Remarkably, the performance of the structure has been promising for the enhancement of the solar thermal energy harvesting devices at middle to high temperatures.

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