Journal
RARE METALS
Volume 39, Issue 12, Pages 1374-1382Publisher
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-020-01491-5
Keywords
Cu additives; Phonon scattering; Effective mass; Texture; Thermoelectric
Funding
- Graduate Scientific Research and Innovation Foundation of Chongqing, China [CYB 19064]
- National Natural Science Foundation of China [51772035, 11674040, 51472036, 51672270]
- Fundamental Research Funds for the Central Universities [106112017CDJQJ308821]
- Key Research Program of Frontier Sciences, CAS [QYZDB-SSW-SLH016]
- CSC Scholarship [201806050180]
- 2019 ITS Summer Fellowship
- Natural Science Foundation of Chongqing, China [cstc2019jcyj-msxmX0554]
- Chongqing University
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Known as a weak topological insulator (TI), BiSe structurally exhibits alternating stacks of quantum spin Hall bilayer (Bi-2) and three-dimensional TI layer (Bi2Se3). The low lattice thermal conductivity of BiSe due to the presence of Bi(2)bilayers promises potentially good thermoelectric performance. Herein, the thermoelectric properties of nominal Bi1-xCuxSe samples were studied as the functions of the content of Cu additive and temperature. It is found that Cu additives in BiSe (1) profoundly affect the texture of densified polycrystalline samples by inclining the crystallographicc-axis parallel toward the pressure direction in the densification process, (2) increase considerably the effective mass and thus the Seebeck coefficient, and (3) yield point defects and Cu-Se secondary phases that effectively scatter heat-carrying phonons. As a result, the optimized electrical and thermal properties yield a thermoelectric figure of merit ofzT similar to 0.29 in Bi1-xCuxSe (x = 0.03) sample at 467 K in parallel to the pressure direction and azT similar to 0.20 at 468 K in the perpendicular direction. Graphic abstract
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