Enhanced thermoelectric performance driven by high-temperature phase transition in the phase change material Ge4SbTe5

Jared B. Williams, Edgar Lara-Curzio, Ercan Cakmak, Thomas Watkins, Donald T. Morelli

    Research output: Research - peer-reviewArticle

    • 3 Citations

    Abstract

    Phase change materials are identified for their ability to rapidly alternate between the amorphous and crystalline phases and have large contrast in the optical/electrical properties of the respective phases. The materials are not only primarily used in memory storage applications, but also recently they have been identified as potential thermoelectric materials [D. Lencer et al., Adv. Mater. 23, 2030-2058 (2011)]. Many of the phase change materials studied today can be found on the pseudo-binary (GeTe)1-x(Sb2Te3) x tie-line. While many compounds on this tie-line have been recognized as thermoelectric materials, here we focus on Ge4SbTe5, a single phase compound just off of the (GeTe)1-x(Sb2Te3) x tie-line, which forms in a stable rocksalt crystal structure at room temperature. We find that stoichiometric and undoped Ge4SbTe5 exhibits a thermal conductivity of ∼1.2 W/m K at high temperature and a large Seebeck coefficient of ∼250 μV/K. The resistivity decreases dramatically at 623 K due to a structural phase transition which leads to a large enhancement in both thermoelectric power factor and thermoelectric figure of merit at 823 K. In a more general sense, the work presents evidence that phase change materials can potentially provide a new route to highly efficient thermoelectric materials for power generation at high temperature.

    LanguageEnglish (US)
    Pages2605-2610
    Number of pages6
    JournalJournal of Materials Research
    Volume30
    Issue number17
    DOIs
    StatePublished - May 15 2015

    Profile

    phase change materials
    thermoelectric materials
    Phase change materials
    Phase transitions
    Temperature
    Seebeck effect
    figure of merit
    thermal conductivity
    electrical properties
    routes
    electrical resistivity
    crystal structure
    augmentation
    room temperature
    Seebeck coefficient
    Thermoelectric power
    Power generation
    Thermal conductivity
    Electric properties
    Crystal structure

    Keywords

    • phase transformation
    • semiconducting
    • thermoelectric

    ASJC Scopus subject areas

    • Materials Science(all)
    • Mechanical Engineering
    • Mechanics of Materials
    • Condensed Matter Physics

    Cite this

    Enhanced thermoelectric performance driven by high-temperature phase transition in the phase change material Ge4SbTe5. / Williams, Jared B.; Lara-Curzio, Edgar; Cakmak, Ercan; Watkins, Thomas; Morelli, Donald T.

    In: Journal of Materials Research, Vol. 30, No. 17, 15.05.2015, p. 2605-2610.

    Research output: Research - peer-reviewArticle

    Williams, Jared B. ; Lara-Curzio, Edgar ; Cakmak, Ercan ; Watkins, Thomas ; Morelli, Donald T./ Enhanced thermoelectric performance driven by high-temperature phase transition in the phase change material Ge4SbTe5. In: Journal of Materials Research. 2015 ; Vol. 30, No. 17. pp. 2605-2610
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