Thermal degradation of refractory layered metamaterial for thermophotovoltaic emitter under high vacuum condition

Jin Hwan Kim, Sang Min Jung, Moo Whan Shin

Research output: Contribution to journalArticle

Abstract

Emissivity-tunable metamaterials of layered refractory metal and dielectric have great potentials as a simple thermophotovoltaic (TPV) selective emitter due to its near-omnidirectional, polarization-independent, and broadband selective emissivity. However, it is known that the stability of the layered structure is limited by the oxidation of metals. While there still exists ambiguity concerning the main source of oxygen between adjacent oxide layers and external residual oxygen, most reports focus on the adjacent layers. In this report, thermal stability of a tungsten-based layered metamaterial is investigated under a high-vacuum environment with great care to reduce residual oxygen. The results show unprecedented thermal stability up to 1200 °C for 3 h without any measurable oxidation of metal. This implies that the interlayer diffusion of oxygen from adjacent oxide layers is not exclusively responsible for the oxidation of metal. At such a high temperature, the layered metamaterial theoretically yields a high convertible radiative power density of 3.04 W/cm 2 with comparable spectral efficiency of 40.2%. Finally, after performing series of thermal tests under higher thermal loads, we propose a novel high-temperature degradation model for layered metamaterials, the stability of which is ultimately limited by the agglomeration of thin metal layers.

Original languageEnglish
Pages (from-to)3039-3054
Number of pages16
JournalOptics Express
Volume27
Issue number3
DOIs
Publication statusPublished - 2019 Feb 4

Fingerprint

thermal degradation
refractories
high vacuum
emitters
oxygen
emissivity
metals
oxidation
thermal stability
refractory metals
oxides
agglomeration
ambiguity
radiant flux density
interlayers
tungsten
degradation
broadband
polarization

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

@article{a18b8a221322468d9daf42e4549b0dc2,
title = "Thermal degradation of refractory layered metamaterial for thermophotovoltaic emitter under high vacuum condition",
abstract = "Emissivity-tunable metamaterials of layered refractory metal and dielectric have great potentials as a simple thermophotovoltaic (TPV) selective emitter due to its near-omnidirectional, polarization-independent, and broadband selective emissivity. However, it is known that the stability of the layered structure is limited by the oxidation of metals. While there still exists ambiguity concerning the main source of oxygen between adjacent oxide layers and external residual oxygen, most reports focus on the adjacent layers. In this report, thermal stability of a tungsten-based layered metamaterial is investigated under a high-vacuum environment with great care to reduce residual oxygen. The results show unprecedented thermal stability up to 1200 °C for 3 h without any measurable oxidation of metal. This implies that the interlayer diffusion of oxygen from adjacent oxide layers is not exclusively responsible for the oxidation of metal. At such a high temperature, the layered metamaterial theoretically yields a high convertible radiative power density of 3.04 W/cm 2 with comparable spectral efficiency of 40.2{\%}. Finally, after performing series of thermal tests under higher thermal loads, we propose a novel high-temperature degradation model for layered metamaterials, the stability of which is ultimately limited by the agglomeration of thin metal layers.",
author = "Kim, {Jin Hwan} and Jung, {Sang Min} and Shin, {Moo Whan}",
year = "2019",
month = "2",
day = "4",
doi = "10.1364/OE.27.003039",
language = "English",
volume = "27",
pages = "3039--3054",
journal = "Optics Express",
issn = "1094-4087",
publisher = "The Optical Society",
number = "3",

}

Thermal degradation of refractory layered metamaterial for thermophotovoltaic emitter under high vacuum condition. / Kim, Jin Hwan; Jung, Sang Min; Shin, Moo Whan.

In: Optics Express, Vol. 27, No. 3, 04.02.2019, p. 3039-3054.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Thermal degradation of refractory layered metamaterial for thermophotovoltaic emitter under high vacuum condition

AU - Kim, Jin Hwan

AU - Jung, Sang Min

AU - Shin, Moo Whan

PY - 2019/2/4

Y1 - 2019/2/4

N2 - Emissivity-tunable metamaterials of layered refractory metal and dielectric have great potentials as a simple thermophotovoltaic (TPV) selective emitter due to its near-omnidirectional, polarization-independent, and broadband selective emissivity. However, it is known that the stability of the layered structure is limited by the oxidation of metals. While there still exists ambiguity concerning the main source of oxygen between adjacent oxide layers and external residual oxygen, most reports focus on the adjacent layers. In this report, thermal stability of a tungsten-based layered metamaterial is investigated under a high-vacuum environment with great care to reduce residual oxygen. The results show unprecedented thermal stability up to 1200 °C for 3 h without any measurable oxidation of metal. This implies that the interlayer diffusion of oxygen from adjacent oxide layers is not exclusively responsible for the oxidation of metal. At such a high temperature, the layered metamaterial theoretically yields a high convertible radiative power density of 3.04 W/cm 2 with comparable spectral efficiency of 40.2%. Finally, after performing series of thermal tests under higher thermal loads, we propose a novel high-temperature degradation model for layered metamaterials, the stability of which is ultimately limited by the agglomeration of thin metal layers.

AB - Emissivity-tunable metamaterials of layered refractory metal and dielectric have great potentials as a simple thermophotovoltaic (TPV) selective emitter due to its near-omnidirectional, polarization-independent, and broadband selective emissivity. However, it is known that the stability of the layered structure is limited by the oxidation of metals. While there still exists ambiguity concerning the main source of oxygen between adjacent oxide layers and external residual oxygen, most reports focus on the adjacent layers. In this report, thermal stability of a tungsten-based layered metamaterial is investigated under a high-vacuum environment with great care to reduce residual oxygen. The results show unprecedented thermal stability up to 1200 °C for 3 h without any measurable oxidation of metal. This implies that the interlayer diffusion of oxygen from adjacent oxide layers is not exclusively responsible for the oxidation of metal. At such a high temperature, the layered metamaterial theoretically yields a high convertible radiative power density of 3.04 W/cm 2 with comparable spectral efficiency of 40.2%. Finally, after performing series of thermal tests under higher thermal loads, we propose a novel high-temperature degradation model for layered metamaterials, the stability of which is ultimately limited by the agglomeration of thin metal layers.

UR - http://www.scopus.com/inward/record.url?scp=85060992903&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85060992903&partnerID=8YFLogxK

U2 - 10.1364/OE.27.003039

DO - 10.1364/OE.27.003039

M3 - Article

C2 - 30732331

AN - SCOPUS:85060992903

VL - 27

SP - 3039

EP - 3054

JO - Optics Express

JF - Optics Express

SN - 1094-4087

IS - 3

ER -