Iridium-based selective emitters for thermophotovoltaic applications

Journal
Advanced materials  
Volume
35
Issue
41
Start Page
1
End Page
12
Article Number
2305922
Citation
Advanced Materials 35 (41): 2305922 (2023-10-12)
Publisher DOI
10.1002/adma.202305922
Scopus ID
2-s2.0-85170076556
Publisher
Elsevier
The long-term operation of refractory-metal-based metamaterials is crucial for applications such as thermophotovoltaics. The metamaterials based on refractory metals like W, Mo, Ta, Nb, and Re fail primarily by oxidation. Here, the use of the noble metal Ir is proposed, which is stable to oxidation and has optical properties comparable to gold. The thermal endurance of Ir in a 3-layer-system, consisting of HfO2/Ir/HfO2, by performing annealing experiments up to 1240 °C in a pressure range from 2 × 10−6 mbar to 1 bar, is demonstrated. The Ir layer shows no oxidation in a vacuum and inert gas atmosphere. At temperatures above 1100 °C, the Ir layer starts to agglomerate due to the degradation of the confining HfO2 layers. An in situ X-ray diffraction experimental comparison between 1D multilayered Ir/HfO2 and W/HfO2 selective emitters annealed at 1000 °C, 2 × 10−6 mbar, over 100 h, confirms oxidation stability of Ir while W multilayers gradually disappear. The results of this work show that W-based metamaterials are not long-term stable even at 1000 °C. However, the oxidation resistance of Ir can be leveraged for refractory plasmonic metamaterials, such as selective emitters in thermophotovoltaic systems with strong suppression of long wavelength radiation.
Subjects
hafnia
iridium
magnetron sputtering
selective emitters
thermophotovoltaics
thin-films
DDC Class
620: Engineering
621: Applied Physics
Publication version
acceptedVersion
Lizenz
https://creativecommons.org/licenses/by/4.0/
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Advanced Materials - 2023 - Vaidhyanathan Krishnamurthy - Iridium‐Based Selective Emitters for Thermophotovoltaic.pdf

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