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Improvement in the thermoelectric performance of highly reproducible n-type (Bi,Sb)2Se3alloys by Cl-doping

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Title
Improvement in the thermoelectric performance of highly reproducible n-type (Bi,Sb)2Se3alloys by Cl-doping
Author(s)
Nadra Nasir; Kyu Hyoung Lee; Sang-il Kim; Hyun-Sik Kim; Jae-Hong Lim; Liangwei Fu; Sung Wng Kim
Publication Date
2020-06
Journal
RSC Advances, v.10, no.41, pp.24663 - 24668
Publisher
Royal Society of Chemistry
Abstract
(Bi,Sb)2Se3 alloys are promising alternatives to commercial n-type Bi2(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 Bi1.2Sb0.8Se3 and BiSbSe3 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 Bi2-xSbxSe3 bulks are thermally stable up to 700 K, and show a reproducible maximum thermoelectric figure of merit, zT, of 0.68 at 700 K. © The Royal Society of Chemistry.
URI
https://pr.ibs.re.kr/handle/8788114/12254
DOI
10.1039/d0ra04065g
ISSN
2046-2069
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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