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Material-Versatile Ultrabroadband Light Absorber with Self-Aggregated Multiscale Funnel Structures
Yunha Ryu1, Changwook Kim1, Junmo Ahn2
1School of Mechanical Engineering , Yonsei University , 50 Yonsei-ro , Seodaemun-gu, Seoul 03722 , Republic of Korea.
ACS Applied Materials & Interfaces
|August 15, 2018
Summary
Researchers developed a versatile ultrabroadband absorber using metal-coated aluminum oxide nanowires. This structure achieves high light absorption across the solar spectrum, showing potential for energy harvesting and optoelectronics.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Broadband light absorbers are crucial for energy harvesting and optoelectronic devices.
- A versatile absorbing structure is needed for diverse operating environments.
Purpose of the Study:
- To fabricate a material-versatile ultrabroadband absorber.
- To achieve high absorptance over the AM 1.5G spectrum (300-2500 nm).
Main Methods:
- Fabrication of metal-coated self-aggregated Al2O3 nanowire bundles with multiscale funnel structures.
- Testing absorbers with various metal coatings (Al, W, TiN).
- Evaluation of thermal-oxidation resistance.
Main Results:
- Achieved high absorptance of ~0.9 over the 300-2500 nm spectrum for multiple metal coatings.
- Demonstrated plasmonic nanofocusing and index-matching effects of the funnel structure.
- Al-coated absorber showed superior thermal-oxidation resistance due to a protective alumina layer.
Conclusions:
- The developed absorber structure enables strong ultrabroadband absorption with various metal coatings.
- The structure's design overcomes differences in optical properties of coating materials.
- Al-coated absorbers offer excellent thermal-oxidation resistance for practical applications.
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