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Silicon-Based Thermoelectrics Made from a Boron-Doped Silicon Dioxide Nanocomposite

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    Silicon-Based Thermoelectrics Made from a Boron-Doped Silicon Dioxide Nanocomposite
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    † Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106-9510, United States
    ‡ Materials Research Laboratory, University of California, Santa Barbara, California 93106-5121, United States
    § Materials Science, California Institute of Technology, Pasadena, California 91106, United States
    ∥ College of Materials, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, P. R. China
    ⊥ Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, United States
    # Materials Department, University of California, Santa Barbara, California 93106-5050, United States
    *E-mail: (G.D.S.) [email protected]
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    Chemistry of Materials

    Cite this: Chem. Mater. 2013, 25, 24, 4867–4873
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    https://doi.org/10.1021/cm401990c
    Published December 5, 2013
    Copyright © 2013 American Chemical Society
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    Abstract

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    We report a method for preparing p-type silicon germanium bulk alloys directly from a boron-doped silica germania nanocomposite. This is the first successful attempt to produce and characterize the thermoelectric properties of SiGe-based thermoelectric materials prepared at temperatures below the alloy’s melting point through a magnesiothermic reduction of the silica-germania nanocomposite. We observe a thermoelectric power factor that is competitive with the literature record obtained for high energy ball milled nanocomposites. The large grain size in our hot pressed samples limits the thermoelectric figure of merit to 0.5 at 800 °C for an optimally doped Si80Ge20 alloy.

    Copyright © 2013 American Chemical Society

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    XRD patterns of the material during the different processing steps, TEM images, compositional properties, carrier properties, and SIMS depth profiles for the samples. This material is available free of charge via the Internet at http://pubs.acs.org.

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    This article is cited by 24 publications.

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    Chemistry of Materials

    Cite this: Chem. Mater. 2013, 25, 24, 4867–4873
    Click to copy citationCitation copied!
    https://doi.org/10.1021/cm401990c
    Published December 5, 2013
    Copyright © 2013 American Chemical Society
    Request reuse permissions

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