Thermoelectric properties of hydrothermally synthesized Bi2Te3−xSex nanocrystals

A chemical route combined with a subsequent spark plasma sintering technique was successfully utilized to synthesize n-type Se-substituted ternary Bi2Te3−xSex (0⩽x⩽0.6). We investigated the effect of Se doping on the thermoelectric properties of the Bi2Te3 nanostructured bulk materials. The results...

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Bibliographic Details
Published in:Scripta materialia 2012-07, Vol.67 (2), p.161-164
Main Authors: Li, D., Qin, X.Y., Dou, Y.C., Li, X.Y., Sun, R.R., Wang, Q.Q., Li, L.L., Xin, H.X., Wang, N., Wang, N.N., Song, C.J., Liu, Y.F., Zhang, J.
Format: Article
Language:English
Subjects:
Dopants
Doping
Electrical properties
Nanocrystalline materials
Nanocrystals
Nanostructure
Scattering
Spark plasma sintering
Thermal conductivity
Thermoelectricity
X-ray diffraction
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Summary:A chemical route combined with a subsequent spark plasma sintering technique was successfully utilized to synthesize n-type Se-substituted ternary Bi2Te3−xSex (0⩽x⩽0.6). We investigated the effect of Se doping on the thermoelectric properties of the Bi2Te3 nanostructured bulk materials. The results indicate that Se doping is an efficient way to reduce the thermal conductivity as compared to that of Bi2Te3 presumably due to enhanced (dopant) scattering of phonons. The maximum thermoelectric figure-of-merit, ZT, is 0.7 at 485K for Bi2Te2.55Se0.45.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2012.04.005