Iridium-based selective emitters for thermophotovoltaic applications

Vaidhyanathan Krishnamurthy, Gnanavel; Chirumamilla, Manohar; Krekeler, Tobias; Ritter, Martin; Raudsepp, Ragle; Schieda, Mauricio; Klassen, Thomas; Pedersen, Kjeld; Petrov, Alexander Yu.; Eich, Manfred; Störmer, Michael

doi:10.1002/adma.202305922

Iridium-based selective emitters for thermophotovoltaic applications

Publication date

2023-08-16

Document type

Forschungsartikel

Author

Vaidhyanathan Krishnamurthy, Gnanavel

Chirumamilla, Manohar

Krekeler, Tobias

Ritter, Martin

Raudsepp, Ragle

Schieda, Mauricio

Klassen, Thomas

Pedersen, Kjeld

Petrov, Alexander Yu.

Eich, Manfred

Störmer, Michael

Organisational unit

Werkstoffkunde

DOI

10.1002/adma.202305922

URI

https://openhsu.ub.hsu-hh.de/handle/10.24405/19202

Publisher

Wiley-VCH

Series or journal

Advanced materials

ISSN

0935-9648

Periodical volume

35

Periodical issue

41

Article ID

2305922

Peer-reviewed

✅

Part of the university bibliography

✅

Language

English

Keyword

Hafnia

Iridium

Magnetron sputtering

Selective emitters

Thermophotovoltaics

Thin-ﬁlms

Abstract

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.

Description

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited (CC BY): https://creativecommons.org/licenses/by/4.0/

Version

Published version

Access right on openHSU

Metadata only access

Open Access Funding

Wiley (DEAL)