Probing the thermoelectric transport properties of n-type Bi2Te3 close to the limit of constitutional undercooling

doi:10.1088/1674-1056/23/11/117202

Abstract Bulk n-type Bi₂Te₃ single crystals with optimized chemical composition were successfully prepared by a high temperature-gradient directional solidification method. We investigate the influence of alloy microstructure, chemical composition, and growth orientation on the thermoelectric transport properties. The results show that the composition of single-crystal Bi₂Te₃ alloy, along the c axis direction, could be slightly tuned by changing the growth rate of the crystal. At a rate of 18 mm/h, the formed Bi₂Te₃ crystal exhibits good thermoelectric properties. At 300 K, a maximum Seebeck coefficient of -245 uV/K and an electrical conductivity of 5.6×10⁴ S/m are acquired. The optimal power factor is obtained as 3.3× 10^-3 W/K²m, with a figure of merit of 0.74. It can be attributed to the increased tellurium allocation in the Bi₂Te₃ alloys, as verified well by the density functional theory calculations.

Keywords: thermoelectric property directional solidification Bi₂Te₃ density functional theory

Received: 10 July 2014
Revised: 07 August 2014
Accepted manuscript online:

PACS:	72.15.Jf	(Thermoelectric and thermomagnetic effects)
	81.30.Fb	(Solidification)
	74.25.F-	(Transport properties)
	32.10.Dk	(Electric and magnetic moments, polarizabilities)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51074127) and the Research Fund of the State Key Laboratory of Solidification Processing of Northwestern Polytechnical University, China (Grant No. SKLSP201010).

Corresponding Authors: Li Shuang-Ming
E-mail: lsm@nwpu.edu.cn

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Feng Song-Ke (冯松科), Li Shuang-Ming (李双明), Fu Heng-Zhi (傅恒志) Probing the thermoelectric transport properties of n-type Bi₂Te₃ close to the limit of constitutional undercooling 2014 Chin. Phys. B 23 117202

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Probing the thermoelectric transport properties of n-type Bi2Te3 close to the limit of constitutional undercooling

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Probing the thermoelectric transport properties of n-type Bi₂Te₃ close to the limit of constitutional undercooling