Material-Versatile Ultrabroadband Light Absorber with Self-Aggregated Multiscale Funnel Structures

Yunha Ryu; Changwook Kim; Junmo Ahn; Augustine M. Urbas; Wounjhang Park; Kyoungsik Kim

doi:10.1021/acsami.8b09116

Material-Versatile Ultrabroadband Light Absorber with Self-Aggregated Multiscale Funnel Structures

Yunha Ryu, Changwook Kim, Junmo Ahn, Augustine M. Urbas, Wounjhang Park, Kyoungsik Kim

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

Broadband light absorbers are essential components for a variety of applications, including energy harvesting and optoelectronic devices. Thus, the development of a versatile absorbing structure that is applicable in various operating environments is required. In this study, a material-versatile ultrabroadband absorber consisting of metal-coated self-aggregated Al₂O₃ nanowire bundles with multiscale funnel structures is fabricated. A high absorptance of ∼0.9 over the AM 1.5G spectrum (300-2500 nm) is realized for absorbers with a range of metal coatings, including Al, W, and titanium nitride (TiN). We demonstrate that the plasmonic nanofocusing and index-matching effects of the funnel structure result in strong ultrabroadband absorption for the various metal coatings, even though the coating materials have different optical properties. As an example of applicability in an operating environment, in the evaluation of the thermal-oxidation resistance, the Al-coated solar absorber exhibits superior performance to those coated with refractory materials such as W and TiN because of the protective alumina layer formed on the Al surface.

Original language	English
Pages (from-to)	29884-29892
Number of pages	9
Journal	ACS Applied Materials and Interfaces
Volume	10
Issue number	35
DOIs	https://doi.org/10.1021/acsami.8b09116
Publication status	Published - 2018 Sept 5

Bibliographical note

Funding Information:
This research was supported by the Global Research Laboratory (GRL) Program, the Pioneer Research Center Program, a grant from the National Research Foundation (NRF) of Korea funded by the Ministry of Science, ICT & Future Planning (NRF-2016K1A1A2912758, NRF-2013M3C1A3065045), the Center for Advanced Meta-Materials (CAMM-2014M3A6B3063712) funded by the Ministry of Science, ICT and Future Planning as a Global Frontier Project, the Asian Office of Aerospace R&D grant, FA2386-15-1-4024 (15IOA024), and the MRSEC: Soft Materials Research Center funded by the National Science Foundation (DMR-1420736).

Publisher Copyright:
Copyright © 2018 American Chemical Society.

All Science Journal Classification (ASJC) codes

Materials Science(all)

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10.1021/acsami.8b09116

Cite this

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title = "Material-Versatile Ultrabroadband Light Absorber with Self-Aggregated Multiscale Funnel Structures",

abstract = "Broadband light absorbers are essential components for a variety of applications, including energy harvesting and optoelectronic devices. Thus, the development of a versatile absorbing structure that is applicable in various operating environments is required. In this study, a material-versatile ultrabroadband absorber consisting of metal-coated self-aggregated Al2O3 nanowire bundles with multiscale funnel structures is fabricated. A high absorptance of ∼0.9 over the AM 1.5G spectrum (300-2500 nm) is realized for absorbers with a range of metal coatings, including Al, W, and titanium nitride (TiN). We demonstrate that the plasmonic nanofocusing and index-matching effects of the funnel structure result in strong ultrabroadband absorption for the various metal coatings, even though the coating materials have different optical properties. As an example of applicability in an operating environment, in the evaluation of the thermal-oxidation resistance, the Al-coated solar absorber exhibits superior performance to those coated with refractory materials such as W and TiN because of the protective alumina layer formed on the Al surface.",

author = "Yunha Ryu and Changwook Kim and Junmo Ahn and Urbas, {Augustine M.} and Wounjhang Park and Kyoungsik Kim",

note = "Funding Information: This research was supported by the Global Research Laboratory (GRL) Program, the Pioneer Research Center Program, a grant from the National Research Foundation (NRF) of Korea funded by the Ministry of Science, ICT & Future Planning (NRF-2016K1A1A2912758, NRF-2013M3C1A3065045), the Center for Advanced Meta-Materials (CAMM-2014M3A6B3063712) funded by the Ministry of Science, ICT and Future Planning as a Global Frontier Project, the Asian Office of Aerospace R&D grant, FA2386-15-1-4024 (15IOA024), and the MRSEC: Soft Materials Research Center funded by the National Science Foundation (DMR-1420736). Publisher Copyright: Copyright {\textcopyright} 2018 American Chemical Society.",

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AU - Park, Wounjhang

AU - Kim, Kyoungsik

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PY - 2018/9/5

Y1 - 2018/9/5

N2 - Broadband light absorbers are essential components for a variety of applications, including energy harvesting and optoelectronic devices. Thus, the development of a versatile absorbing structure that is applicable in various operating environments is required. In this study, a material-versatile ultrabroadband absorber consisting of metal-coated self-aggregated Al2O3 nanowire bundles with multiscale funnel structures is fabricated. A high absorptance of ∼0.9 over the AM 1.5G spectrum (300-2500 nm) is realized for absorbers with a range of metal coatings, including Al, W, and titanium nitride (TiN). We demonstrate that the plasmonic nanofocusing and index-matching effects of the funnel structure result in strong ultrabroadband absorption for the various metal coatings, even though the coating materials have different optical properties. As an example of applicability in an operating environment, in the evaluation of the thermal-oxidation resistance, the Al-coated solar absorber exhibits superior performance to those coated with refractory materials such as W and TiN because of the protective alumina layer formed on the Al surface.

AB - Broadband light absorbers are essential components for a variety of applications, including energy harvesting and optoelectronic devices. Thus, the development of a versatile absorbing structure that is applicable in various operating environments is required. In this study, a material-versatile ultrabroadband absorber consisting of metal-coated self-aggregated Al2O3 nanowire bundles with multiscale funnel structures is fabricated. A high absorptance of ∼0.9 over the AM 1.5G spectrum (300-2500 nm) is realized for absorbers with a range of metal coatings, including Al, W, and titanium nitride (TiN). We demonstrate that the plasmonic nanofocusing and index-matching effects of the funnel structure result in strong ultrabroadband absorption for the various metal coatings, even though the coating materials have different optical properties. As an example of applicability in an operating environment, in the evaluation of the thermal-oxidation resistance, the Al-coated solar absorber exhibits superior performance to those coated with refractory materials such as W and TiN because of the protective alumina layer formed on the Al surface.

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Material-Versatile Ultrabroadband Light Absorber with Self-Aggregated Multiscale Funnel Structures

Abstract

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