Improvement in the thermoelectric performance of highly reproducible n-type (Bi,Sb)2Se3alloys by Cl-doping
- Authors
- Nasir, N.; Lee, K.H.; Kim, S.-I.; Kim, H.-S.; Lim, J.-H.; Fu, L.; Kim, S.W.
- Issue Date
- Jun-2020
- Publisher
- Royal Society of 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/gachon/handle/2020.sw.gachon/66276
- DOI
- 10.1039/d0ra04065g
- ISSN
- 2046-2069
- 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.
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