Improvement in the thermoelectric performance of highly reproducible n-type (Bi,Sb)(2)Se(3)alloys by Cl-doping
- Authors
- Nasir, Nadra; Lee, Kyu Hyoung; Kim, Sang-il; Kim, Hyun-Sik; Lim, Jae-Hong; Fu, Liangwei; Kim, Sung Wng
- Issue Date
- Jun-2020
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- RSC ADVANCES, v.10, no.41, pp.24663 - 24668
- Journal Title
- RSC ADVANCES
- Volume
- 10
- Number
- 41
- Start Page
- 24663
- End Page
- 24668
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/11677
- DOI
- 10.1039/d0ra04065g
- ISSN
- 2046-2069
- Abstract
- (Bi,Sb)(2)Se(3)alloys are promising alternatives to commercial n-type Bi-2(Te,Se)(3)ingots for low-mid temperature thermoelectric power generation due to their high thermoelectric conversion efficiency at elevated temperatures. Herein, we report the enhanced high-temperature thermoelectric performance of the polycrystalline Cl-doped Bi2-xSbxSe3(x= 0.8, 1.0) bulks and their sustainable thermal stability. Significant role of Cl substitution, characterized to enhance the power factor and reduce the thermal conductivity synergetically, is clearly elucidated. Cl-doping at Se-site of both Bi(1.2)Sb(0.8)Se(3)and BiSbSe(3)results in a high power factor by carrier generation and Hall mobility improvement while maintaining converged electronic band valleys. Furthermore, point defect phonon scattering originated from mass fluctuations formed at Cl-substituted Se-sites reduces the lattice thermal conductivity. Most importantly, spark plasma sintered Cl-doped Bi(2-x)Sb(x)Se(3)bulks are thermally stable up to 700 K, and show a reproducible maximum thermoelectric figure of merit,zT, of 0.68 at 700 K.
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Collections - Graduate School > Materials Science and Engineering > 1. Journal Articles
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