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 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.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Chirumamilla M,Krishnamurthy GV,Knopp K,Krekeler T,Graf M,Jalas D,Ritter M,Störmer M,Petrov AY,Eich M

doi

10.1038/s41598-019-43640-6

subject

Has Abstract

pub_date

2019-05-10 00:00:00

pages

7241

issue

1

issn

2045-2322

pii

10.1038/s41598-019-43640-6

journal_volume

9

pub_type

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