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SUMMARY:Rectangular Cuboid Metamaterial Emitter at High Temperatures with 
 Enhanced Spectral Efficiency for Low-Bandgap Energy Conversion.
DTSTART;VALUE=DATE-TIME:20260609T185000Z
DTEND;VALUE=DATE-TIME:20260609T191000Z
DTSTAMP;VALUE=DATE-TIME:20260606T094330Z
UID:indico-contribution-10358@events.saip.org.za
DESCRIPTION:Speakers: Tesfaye Hurrisa (Adama science and Technology univer
 sity)\nEnergy concerns are among the main obstacles to maintaining the via
 bility of our planet and modern life\, as fossil fuels non-renewable energ
 y resources remain the primary source of global energy consumption. This s
 tudy presents a theoretical investigation into the spectral performance of
  a metamaterial structure composed of tungsten (W) and hafnium dioxide (Hf
 O₂) layers\, specifically designed using the Finite Element Method (FEM)
  for energy conversion applications. The properties of materials were stud
 ied using DFT with Quantum ESPRESSO and the Materials Project\, and were t
 aken from databases. The proposed structure is a broadband\, wide-angle\, 
 and polarization-independent rectangular cuboid metamaterial (MDM) emitter
  intended for power generation systems\, falling under the category of ren
 ewable energy technologies. The designed emitter is configured in a three-
 layer arrangement to enhance light absorption and emission characteristics
  at specific wavelengths\, with a cut-off wavelength of 2.3 μm for an InG
 aAsSb photovoltaic cell operating at high temperatures. To achieve the des
 ired broadband emission\, various geometric parameters were optimized\, in
 cluding the cuboid’s height and length\, the dielectric layer thickness\
 , and the unit cell width. Meanwhile\, the width and height of the ground 
 plane\, along with the cuboid's distance from the center\, were kept const
 ant. Numerical simulations demonstrated a mean emittance of 94% in the wav
 elength range of 0.3–2.3 μm. Compared to other designs\, the proposed e
 mitter exhibits higher spectral efficiency under high-temperature conditio
 ns. Notably\, at 1600 K\, the rectangular cuboid emitter achieved a spectr
 al efficiency of 90% with an InGaAsSb bandgap of 0.53 eV. Thus\, the prima
 ry advantages of this study over previous ones include high spectral effic
 iency at specific bandgaps (indicating high conversion efficiency)\, cost-
 effectiveness\, ease of large-scale production\, reduced greenhouse gas em
 issions\, and long-term durability under high temperatures.\nKeywords: Sel
 ective Emitter\, Energy\, Thermo-photovoltaic\, Metamaterial\n\nhttps://ev
 ents.saip.org.za/event/274/contributions/10358/
LOCATION:
URL:https://events.saip.org.za/event/274/contributions/10358/
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