Enhanced thermoelectric performance driven by high-temperature phase transition in the phase change material Ge<sub>4</sub>SbTe<sub>5</sub> [electronic resource].
- Washington, D.C. : United States. Dept. of Energy. Office of Energy Efficiency and Renewable Energy, 2015. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- pages 2,605-2,610 : digital, PDF file
- Additional Creators:
- Oak Ridge National Laboratory, United States. Department of Energy. Office of Energy Efficiency and Renewable Energy, and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Phase change materials are identified for their ability to rapidly alternate between amorphous and crystalline phases and have large contrast in the optical/electrical properties of the respective phases. The materials are primarily used in memory storage applications, but recently they have also been identified as potential thermoelectric materials. Many of the phase change materials researched today can be found on the pseudo-binary (GeTe)<sub>1-x</sub>(Sb<sub>2</sub>Te<sub>3</sub>)<sub>x</sub> tie-line. While many compounds on this tie-line have been recognized as thermoelectric materials, here we focus on Ge<sub>4</sub>SbTe<sub>5</sub>, a single phase compound just off of the (GeTe)<sub>1-x</sub>(Sb<sub>2</sub>Te<sub>3</sub>)<sub>x</sub> tie-line, that forms in a stable rocksalt crystal structure at room temperature. We find that stoichiometric and undoped Ge<sub>4</sub>SbTe<sub>5</sub> 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 lends to a large enhancement in both thermoelectric power factor and thermoelectric figure of merit at 823 K. In a more general sense the research presents evidence that phase change materials can potentially provide a new route to highly efficient thermoelectric materials for power generation at high temperature.
- Published through SciTech Connect., 05/15/2015., "VT0503000", "CEVT005", Journal of Materials Research 30 17 ISSN 0884-2914 AM, and Jared B. Williams; Edgar Lara-Curzio; Ercan Cakmak; Thomas R. Watkins; Donald T. Morelli.
- Funding Information:
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