Thermoelectric properties in three-dimensional topological insulator thin films
- Title
- Thermoelectric properties in three-dimensional topological insulator thin films
- Authors
- 임명수
- Date Issued
- 2018
- Publisher
- 포항공과대학교
- Abstract
- Three-dimensional topological insulators (3D TIs) have the topologically
protected conducting surface states. These unusual surface states influence the
transport behaviors. We focus on the thermoelectric properties. The 3D TI
Bi2Te3, Bi2Se3 and Sb2Te3 are good thermoelectric materials. The relations
between TI surface states and thermoelectric properties are central subjects to
increase the thermoelectric efficiency. In this thesis, we have studied
thermoelectric properties of three-dimensional topological insulator thin films
using density-functional theory to investigate the effects of surface states and
quantum confinement effects varying the film thickness. First-principles
calculations and semi-classical Boltzmann transport method are used to
investigate the thermoelectric property of Bi2Te3, Bi2Se3 and Sb2Te3 in a-fewlayer
structures. Results of this study have shown that the Seebeck
coefficients of n-type and p-type doped films exhibit contrasting behavior
upon variation in film thickness and that the thickness dependence of the
Seebeck coefficient is associated with the interplay of the quantum
confinement effect and the surface states near the Fermi level in 2D structures.
- URI
- http://postech.dcollection.net/common/orgView/200000007471
https://oasis.postech.ac.kr/handle/2014.oak/93469
- Article Type
- Thesis
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