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Unique hierarchical structure and high thermoelectric properties of antimony telluride pillar arrays.
- Source :
-
Journal of Nanoparticle Research . Oct2012, Vol. 14 Issue 10, p1-11. 11p. 2 Black and White Photographs, 1 Diagram, 1 Chart, 2 Graphs. - Publication Year :
- 2012
-
Abstract
- The p-type antimony telluride (SbTe) pillar arrays with unique hierarchical architecture have been self-assembled in large scale by a simple vacuum thermal evaporation technique. The composition and the microstructure of the films are studied by X-ray diffraction, scanning electron microscopy with energy dispersive X-ray spectroscopy, and high-resolution transmission electron microscopy. The results show that the hierarchical film with multi-scale and multi-dimensional structure is well-oriented pillar arrays perpendicular to the substrate. A large number of nanowires (NWs) are assembled into a submicro/micro-scaled pillar, while antisite defects and dislocations as well as other defects are found in the one-dimensional NWs. The growth mechanism of such nanostructure is proposed and investigated. The thermoelectric (TE) properties, i.e., electrical conductivity (σ), Seebeck coefficient ( S), and thermal conductivity ( κ) of the films are measured. The properties of the hierarchical SbTe film have been greatly enhanced in comparison with those of the ordinary SbTe films. A TE dimensionless figure-of-merit ZT = 0.88 in the novel hierarchical SbTe film is obtained at room temperature. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13880764
- Volume :
- 14
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Journal of Nanoparticle Research
- Publication Type :
- Academic Journal
- Accession number :
- 82536480
- Full Text :
- https://doi.org/10.1007/s11051-012-1204-y