Large-Area Ultrabroadband Absorber for Solar Thermophotovoltaics Based on 3D Titanium Nitride Nanopillars

Manohar Chirumamilla*, Anisha Chirumamilla, Yuanqing Yang, Alexander S. Roberts, Peter Kjaer Kristensen, Krishnakali Chaudhuri, Alexandra Boltasseva, Duncan S. Sutherland, Sergey I. Bozhevolnyi, Kjeld Pedersen

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

Broadband absorbers, with the simultaneous advantages of thermal stability, insensitivity to light polarization and angle, robustness against harsh environmental conditions, and large area fabrication by scalable methods, are essential elements in (solar) thermophotovoltaics. Compared to the noble metal and multilayered broadband absorbers, high-temperature refractory metal-based nanostructures with low-Q resonators are reported less. In this work, 3D titanium nitride (TiN) nanopillars are investigated for ultrabroadband absorption in the visible and near-infrared spectral regions with average absorptivities of 0.94, over a wide range of oblique angles between 0 degrees and 75 degrees. The effect of geometrical parameters of the TiN nanopillars on broadband absorption is investigated. By combining the flexibility of nanopillar design and lossy TiN films, ultrabroadband absorption in the visible and near-infrared is obtained. A thin layer of hafnium oxide is deposited to enhance the thermal stability of TiN nanopillars. Finally, the thermal/spectral stability of the TiN nanopillars is demonstrated after annealing at 1473 K for 24 h while retaining their structural features. Thus, the TiN nanopillars can provide excellent opportunities for high-temperature applications, especially solar thermophotovoltaics.

Original languageEnglish
Article number1700552
JournalAdvanced Optical Materials
Volume5
Issue22
Number of pages8
DOIs
Publication statusPublished - 16 Nov 2017

Keywords

  • 3D nanopillars
  • broadband absorption
  • high-temperature photonics
  • titanium nitride
  • vertical-gap plasmon resonators
  • THERMAL EMISSION
  • REFRACTORY PLASMONICS
  • SENSING APPLICATIONS
  • PHOTONIC CRYSTALS
  • ABSORPTION
  • ARRAYS
  • LIGHT
  • FABRICATION
  • RESONATORS
  • EFFICIENCY

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