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Enhanced thermoelectric performance driven by high-temperature phase transition in the phase change material Ge4SbTe5.
- Source :
- Journal of Materials Research; Sep2015, Vol. 30 Issue 17, p2605-2610, 6p
- Publication Year :
- 2015
-
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. [ABSTRACT FROM PUBLISHER]
Details
- Language :
- English
- ISSN :
- 08842914
- Volume :
- 30
- Issue :
- 17
- Database :
- Complementary Index
- Journal :
- Journal of Materials Research
- Publication Type :
- Academic Journal
- Accession number :
- 109411661
- Full Text :
- https://doi.org/10.1557/jmr.2015.124