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Quasi-two-dimensional GeSbTe compounds as promising thermoelectric materials with anisotropic transport properties
- Source :
- Applied Physics Letters. 114:053903
- Publication Year :
- 2019
- Publisher :
- AIP Publishing, 2019.
-
Abstract
- Pseudo-binary GeSbTe alloys, best known as phase-change materials, are quasi-two-dimensional semiconductors in their stable trigonal phases with high electrical conductivity and low thermal conductivity, but their thermoelectric properties have not been systematically investigated. Here, in this letter, we prepared polycrystalline Ge2Sb2Te5, GeSb2Te4, and GeSb4Te7 bulk materials and studied the thermoelectric transport properties. Large anisotropy in Seebeck coefficient as well as in electrical conductivity is observed, which is not commonly reported in polycrystalline thermoelectric materials. Combining experimental study and theoretical calculations, one can find that this phenomenon is attributed to the asymmetry of a material's band structure. Maximal zT values of 0.46–0.60 are achieved at 750 K, indicating that GeSbTe-based compounds are promising thermoelectric materials for mid-temperature applications.
- Subjects :
- 010302 applied physics
Materials science
Physics and Astronomy (miscellaneous)
Condensed matter physics
business.industry
02 engineering and technology
GeSbTe
021001 nanoscience & nanotechnology
Thermoelectric materials
01 natural sciences
chemistry.chemical_compound
Thermal conductivity
Semiconductor
chemistry
Electrical resistivity and conductivity
Seebeck coefficient
0103 physical sciences
Thermoelectric effect
0210 nano-technology
Anisotropy
business
Subjects
Details
- ISSN :
- 10773118 and 00036951
- Volume :
- 114
- Database :
- OpenAIRE
- Journal :
- Applied Physics Letters
- Accession number :
- edsair.doi...........1417742fcf3f2f56a74234c4332a5003