Anisotropic Behavior of the Temperature-Dependent Thermal Conductivity in p-Type Bismuth Antimony Telluride (p-Bi0.5Sb1.5Te3) Thin Films
- Authors
- Lee, Won-Yong; Park, No-Won; Ahn, Jay-Young; Umar, Ahmad; Lee, Sang-Kwon
- Issue Date
- Oct-2017
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- Anisotropic Thermal Conductivity; Bismuth Antimony Telluride (Bi0.5Sb1.5Te3); 3 omega Technique; Callaway Model; Sondheimer Model
- Citation
- JOURNAL OF NANOELECTRONICS AND OPTOELECTRONICS, v.12, no.10, pp 1123 - 1128
- Pages
- 6
- Journal Title
- JOURNAL OF NANOELECTRONICS AND OPTOELECTRONICS
- Volume
- 12
- Number
- 10
- Start Page
- 1123
- End Page
- 1128
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/3910
- DOI
- 10.1166/jno.2017.2108
- ISSN
- 1555-130X
1555-1318
- Abstract
- Bismuth antimony telluride (Bi0.5Sb1.5Te3, BST) is the most widely used p-type thermoelectric (TE) material operating near room temperature. Recently, several research groups reported the enhancement of the dimensionless figure of merit, ZT, of Bi0.5Sb1.5Te3 bulk materials, as a result of using various solidification techniques. It is well known that the ZT value can be enhanced in low-dimensional systems, more so than in bulk material, owing to the enhanced phonon scattering present in such systems. Thus, systematic studies should be carried out on a number of TE materials in order to further enhance their ZT value, by reducing their thermal conductivity. In this study, both the in-plane and cross-plane thermal conductivities of p-type BST thin films in the temperature range 100-450 K were investigated using the four-point-probe 3 omega technique. In this temperature range, the average in-plane and cross-plane thermal conductivities of the films were determined to be approximately, similar to 0.60-0.77 W m(-1) K-1, and similar to 0.4-0.53 W m(-1) K-1, respectively. Furthermore, our experimental results were analyzed using modified Sondheimer and Callaway models in order to calculate the anisotropic ratio, and temperature dependence of the lattice and electronic thermal conductivities for the p-BST thin films in both the in-plane and cross-plane directions.
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Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
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