Metamaterial emitter for thermophotovoltaics stable up to 1400 °C

Abstract High temperature stable selective emitters can significantly increase efficiency and radiative power in thermophotovoltaic (TPV) systems. However, optical properties of structured emitters reported so far degrade at temperatures approaching 1200 °C due to various degradation mechanisms. We...

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Autores principales:	Manohar Chirumamilla, Gnanavel Vaidhyanathan Krishnamurthy, Katrin Knopp, Tobias Krekeler, Matthias Graf, Dirk Jalas, Martin Ritter, Michael Störmer, Alexander Yu Petrov, Manfred Eich
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2019
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/065a0eaa0973406fb5364bc0a135153b
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spelling	oai:doaj.org-article:065a0eaa0973406fb5364bc0a135153b2021-12-02T16:08:17ZMetamaterial emitter for thermophotovoltaics stable up to 1400 °C10.1038/s41598-019-43640-62045-2322https://doaj.org/article/065a0eaa0973406fb5364bc0a135153b2019-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-019-43640-6https://doaj.org/toc/2045-2322Abstract High temperature stable selective emitters can significantly increase efficiency and radiative power in thermophotovoltaic (TPV) systems. However, optical properties of structured emitters reported so far degrade at temperatures approaching 1200 °C due to various degradation mechanisms. We have realized a 1D structured emitter based on a sputtered W-HfO2 layered metamaterial and demonstrated desired band edge spectral properties at 1400 °C. To the best of our knowledge the temperature of 1400 °C is the highest reported for a structured emitter, so far. The spatial confinement and absence of edges stabilizes the W-HfO2 multilayer system to temperatures unprecedented for other nanoscaled W-structures. Only when this confinement is broken W starts to show the well-known self-diffusion behavior transforming to spherical shaped W-islands. We further show that the oxidation of W by atmospheric oxygen could be prevented by reducing the vacuum pressure below 10−5 mbar. When oxidation is mitigated we observe that the 20 nm spatially confined W films survive temperatures up to 1400 °C. The demonstrated thermal stability is limited by grain growth in HfO2, which leads to a rupture of the W-layers, thus, to a degradation of the multilayer system at 1450 °C.Manohar ChirumamillaGnanavel Vaidhyanathan KrishnamurthyKatrin KnoppTobias KrekelerMatthias GrafDirk JalasMartin RitterMichael StörmerAlexander Yu PetrovManfred EichNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 9, Iss 1, Pp 1-11 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Manohar Chirumamilla Gnanavel Vaidhyanathan Krishnamurthy Katrin Knopp Tobias Krekeler Matthias Graf Dirk Jalas Martin Ritter Michael Störmer Alexander Yu Petrov Manfred Eich Metamaterial emitter for thermophotovoltaics stable up to 1400 °C
description	Abstract High temperature stable selective emitters can significantly increase efficiency and radiative power in thermophotovoltaic (TPV) systems. However, optical properties of structured emitters reported so far degrade at temperatures approaching 1200 °C due to various degradation mechanisms. We have realized a 1D structured emitter based on a sputtered W-HfO2 layered metamaterial and demonstrated desired band edge spectral properties at 1400 °C. To the best of our knowledge the temperature of 1400 °C is the highest reported for a structured emitter, so far. The spatial confinement and absence of edges stabilizes the W-HfO2 multilayer system to temperatures unprecedented for other nanoscaled W-structures. Only when this confinement is broken W starts to show the well-known self-diffusion behavior transforming to spherical shaped W-islands. We further show that the oxidation of W by atmospheric oxygen could be prevented by reducing the vacuum pressure below 10−5 mbar. When oxidation is mitigated we observe that the 20 nm spatially confined W films survive temperatures up to 1400 °C. The demonstrated thermal stability is limited by grain growth in HfO2, which leads to a rupture of the W-layers, thus, to a degradation of the multilayer system at 1450 °C.
format	article
author	Manohar Chirumamilla Gnanavel Vaidhyanathan Krishnamurthy Katrin Knopp Tobias Krekeler Matthias Graf Dirk Jalas Martin Ritter Michael Störmer Alexander Yu Petrov Manfred Eich
author_facet	Manohar Chirumamilla Gnanavel Vaidhyanathan Krishnamurthy Katrin Knopp Tobias Krekeler Matthias Graf Dirk Jalas Martin Ritter Michael Störmer Alexander Yu Petrov Manfred Eich
author_sort	Manohar Chirumamilla
title	Metamaterial emitter for thermophotovoltaics stable up to 1400 °C
title_short	Metamaterial emitter for thermophotovoltaics stable up to 1400 °C
title_full	Metamaterial emitter for thermophotovoltaics stable up to 1400 °C
title_fullStr	Metamaterial emitter for thermophotovoltaics stable up to 1400 °C
title_full_unstemmed	Metamaterial emitter for thermophotovoltaics stable up to 1400 °C
title_sort	metamaterial emitter for thermophotovoltaics stable up to 1400 °c
publisher	Nature Portfolio
publishDate	2019
url	https://doaj.org/article/065a0eaa0973406fb5364bc0a135153b
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Metamaterial emitter for thermophotovoltaics stable up to 1400 °C

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