Enhanced thermoelectric performance driven by high-temperature phase transition in the phase change material Ge4SbTe5. Issue 17 (15th May 2015)

• Record Type: Journal Article
• Authors: Williams, Jared B.; Lara-Curzio, Edgar; Cakmak, Ercan; Watkins, Thomas; Morelli, Donald T.
• Is Part Of: Journal of materials research. Volume 30:Issue 17(2015)
• Page Start: 2605
• Page End: 2610
• Publication Date: 2015-05-15
• Subjects: thermoelectric, -- phase transformation, -- semiconducting; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1557/jmr.2015.124
• Languages: English
• ISSNs: 0884-2914

Abstract

Abstract: 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 (Sb2 Te3 ) x tie-line. While many compounds on this tie-line have been recognized as thermoelectric materials, here we focus on Ge4 SbTe5, a single phase compound just off of the (GeTe)1− x (Sb2 Te3 ) x tie-line, which forms in a stable rocksalt crystal structure at room temperature. We find that stoichiometric and undoped Ge4 SbTe5 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.