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    Mirror-backed Dark Alumina: A Nearly Perfect Absorber for Thermoelectronics and Thermophotovotaics

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    Type
    Article
    Authors
    Farhat, Mohamed
    Cheng, Tsung-Chieh
    Le, Khai. Q.
    Cheng, Mark Ming-Cheng
    Bagci, Hakan cc
    Chen, Pai-Yen
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Date
    2016-01-28
    Online Publication Date
    2016-01-28
    Print Publication Date
    2016-04
    Permanent link to this record
    http://hdl.handle.net/10754/595302
    
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    Abstract
    We present here a broadband, wide-angle, and polarization-independent nearly perfect absorber consisting of mirror-backed nanoporous alumina. By electrochemically anodizing the disordered multicomponent aluminum and properly tailoring the thickness and air-filling fraction of nanoporous alumina, according to the Maxwell-Garnet mixture theory, a large-area dark alumina can be made with excellent photothermal properties and absorption larger than 93% over a wide wavelength range spanning from near-infrared to ultraviolet light, i.e. 250 nm–2500 nm. The measured absorption is orders of magnitude greater than other reported anodized porous alumina, typically semi-transparent at similar wavelengths. This simple yet effective approach, however, does not require any lithography, nano-mixture deposition, pre- and post-treatment. Here, we also envisage and theoretically investigate the practical use of proposed absorbers and/or photothermal converters in integrated thermoelectronic and/or thermophotovoltaic energy conversion devices, which make efficient use of the entire spectrum of ambient visible to near-infrared radiation.
    Citation
    Mirror-backed Dark Alumina: A Nearly Perfect Absorber for Thermoelectronics and Thermophotovotaics 2016, 6:19984 Scientific Reports
    Publisher
    Springer Nature
    Journal
    Scientific Reports
    DOI
    10.1038/srep19984
    PubMed ID
    26817710
    Additional Links
    http://www.nature.com/articles/srep19984
    ae974a485f413a2113503eed53cd6c53
    10.1038/srep19984
    Scopus Count
    Collections
    Articles; Electrical Engineering Program; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

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