Fabrication and Thermoelectric Properties of p-Type Si0.8Ge0.2 Alloy Doped with Boron

Abstract:

Article Preview

P-type thermoelectric material Si0.8Ge0.2 was fabricated by mechanical alloying(MA) and Hot-Press Process(HP) The effect of Boron(0.25~2wt%) addition on the thermoelectric properties of p-type Si0.8Ge0.2 alloy was reported. Experiments showed that the electrical conductivity decreased with Boron content at temperature ranging from 500K to 1250K. The carrier concentration measured by the Hall effect measurement also decreased as a function of doping level. With increasing temperature, the Seebeck coefficient and the power factor increased with boron content. Based on measured results, the Figure of Merit (Z) value of 0.5 wt% Si0.8Ge0.2 alloy increased with the small addition of Boron, and reached maximum rapidly; the Z value was 0.9×10-3/K, the highest value among the prepared alloys.

Info:

Periodical:

Materials Science Forum (Volumes 544-545)

Edited by:

Hyungsun Kim, Junichi Hojo and Soo Wohn Lee

Pages:

745-748

Citation:

S. D. Hwang et al., "Fabrication and Thermoelectric Properties of p-Type Si0.8Ge0.2 Alloy Doped with Boron", Materials Science Forum, Vols. 544-545, pp. 745-748, 2007

Online since:

May 2007

Export:

Price:

$38.00

[1] Ch.H. Park, in: The technology of energy conversion, K. Y Inc(1986).

[2] M.V. Vedernikov, Thermoelectric and electrical Applications, Intermetallic Compound, VOL2, Ch. 20, (1994).

[3] D.M. Rowe, in: CRC handbook of thermoelectrics, edited by D.M. Rowe, Ph. D, D. Sc., Chapter 33, p.401, CRC press Inc(1995).

[4] D.M. Rowe, in: CRC handbook of thermoelectrics, CRC Press Inc(1994).

[5] C. Vining and J. P Fleurial, in: Silicon Germanium-An Over-view of Recent Developments, Proc. of the 12 th Int. Conf. on Thermoelectric, 69, 1993 Figure. 7 Figure of merit as a function of temperature for p-type Si-Ge-B samples sintered by hot pressing.