Surface-Decorated Silicon Nanowires: A Route to High-ZT Thermoelectrics

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    Abstract

    Based on atomistic calculations of electron and phonon transport, we propose to use surface-decorated silicon nanowires for thermoelectric applications. Two examples of surface decorations are studied to illustrate the underlying ideas: nanotrees and alkyl functionalized silicon nanowires. For both systems we find (i) that the phonon conductance is significantly reduced compared to the electronic conductance leading to high thermoelectric figure of merit ZT, and (ii) for ultrathin wires, surface decoration leads to significantly better performance than surface disorder.
    Original languageEnglish
    JournalPhysical Review Letters
    Volume103
    Issue number5
    Pages (from-to)055502
    ISSN0031-9007
    DOIs
    Publication statusPublished - 2009

    Bibliographical note

    Copyright 2009 American Physical Society

    Keywords

    • QUANTUM
    • ELECTRONIC-PROPERTIES
    • TRANSPORT
    • SCATTERING
    • CONDUCTANCE
    • FORMULA
    • THERMOPOWER
    • SI
    • GROWTH
    • NANOTREES

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