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Publisher DOI: 10.1038/s41598-019-43640-6
Title: Metamaterial emitter for thermophotovoltaics stable up to 1400 °C
Language: English
Authors: Chirumamilla, Manohar 
Krishnamurthy, Gnanavel Vaidhyanathan 
Knopp, Katrin 
Krekeler, Tobias 
Graf, Matthias 
Jalas, Dirk 
Ritter, Martin 
Störmer, Michael 
Petrov, Alexander 
Eich, Manfred 
Keywords: spectral properties;self-diffusion
Issue Date: 10-May-2019
Source: Scientific Reports (9): 7241 (2019-05-10)
Journal or Series Name: Scientific reports 
Abstract (english): 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-HfO 2 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-HfO 2 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 HfO 2 , which leads to a rupture of the W-layers, thus, to a degradation of the multilayer system at 1450 °C.
DOI: 10.15480/882.2275
ISSN: 2045-2322
Institute: Optische und Elektronische Materialien E-12 
Type: (wissenschaftlicher) Artikel
Funded by: DFG German Research Foundation, Projektnummer 192346071 – SFB 986, and the Hamburg University of Technology (TUHH) Projektnummer 392323616
Project: Open Access Publizieren 2018 - 2019 / TU Hamburg 
Appears in Collections:Publications (tub.dok)

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