Using Ge Secondary Phases to Enhance the Power Factor and Figure of Merit of Ge17Sb2Te20

Jared B. Williams, Donald T. Morelli

    Research output: Contribution to journalArticle

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    Abstract

    Thermoelectric materials are the leading candidate today for applications in solid-state waste-heat recovery/cooling applications. Research and engineering has pushed the ZT, and overall conversion efficiency, of these materials to values which can be deemed practical for commercialization. However, many of the state-of-the-art thermoelectric materials of today utilize elements which are toxic, such as Ag, Pb, Tl, and Cd. Alloys of GeTe and Sb2Te3 were first explored for their applications in phase-change memory, because of their ability to rapidly alternate between crystalline and amorphous phases. Recently, these materials have been identified as materials with ZT (S2T/ρκ, where S is the Seebeck coefficient, ρ is the electrical resistivity, T is the operating temperature, and κ is the thermal conductivity) much greater than unity. In this work, the influence of elemental Ge as a secondary phase on transport in Ge17Sb2Te20 was explored. It was found that Ge introduces an additional scattering mechanism, which leads to increased electrical resistivity, Seebeck coefficient, and power factor values as high as 36 μW cm−1 K−2. The thermal conductivity was slightly reduced and the ZT was enhanced across the entire temperature range of measurement, with peak values greater than 2.

    Original languageEnglish (US)
    Pages (from-to)1-10
    Number of pages10
    JournalJournal of Electronic Materials
    DOIs
    StateAccepted/In press - Aug 18 2016

    Profile

    Traffic Accidents
    thermoelectric materials
    Seebeck effect
    thermal conductivity
    electrical resistivity
    Joint Loose Bodies
    Acetanilides
    Seebeck coefficient
    Thermal conductivity
    Temperature
    waste heat
    commercialization
    operating temperature
    figure of merit
    unity
    recovery
    engineering
    solid state
    cooling
    scattering

    Keywords

    • composite
    • phase-change material
    • Thermoelectric

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Electrical and Electronic Engineering
    • Materials Chemistry

    Cite this

    Using Ge Secondary Phases to Enhance the Power Factor and Figure of Merit of Ge17Sb2Te20 . / Williams, Jared B.; Morelli, Donald T.

    In: Journal of Electronic Materials, 18.08.2016, p. 1-10.

    Research output: Contribution to journalArticle

    Williams, Jared B.; Morelli, Donald T. / Using Ge Secondary Phases to Enhance the Power Factor and Figure of Merit of Ge17Sb2Te20 .

    In: Journal of Electronic Materials, 18.08.2016, p. 1-10.

    Research output: Contribution to journalArticle

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