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. 2016 Jan 18:6:19129.
doi: 10.1038/srep19129.

Anisotropic Effects on the Thermoelectric Properties of Highly Oriented Electrodeposited Bi2Te3 Films

Cristina V Manzano  1 , Begoña Abad  1 , Miguel Muñoz Rojo  1 , Yee Rui Koh  2 , Stephen L Hodson  2   3 , Antonio M Lopez Martinez  4 , Xianfan Xu  2   3 , Ali Shakouri  2 , Timothy D Sands  2   3   5 , Theodorian Borca-Tasciuc  6 , Marisol Martin-Gonzalez  1
Affiliations

Anisotropic Effects on the Thermoelectric Properties of Highly Oriented Electrodeposited Bi2Te3 Films

Cristina V Manzano et al. Sci Rep. .

Abstract

Highly oriented [1 1 0] Bi2Te3 films were obtained by pulsed electrodeposition. The structure, composition, and morphology of these films were characterized. The thermoelectric figure of merit (zT), both parallel and perpendicular to the substrate surface, were determined by measuring the Seebeck coefficient, electrical conductivity, and thermal conductivity in each direction. At 300 K, the in-plane and out-of-plane figure of merits of these Bi2Te3 films were (5.6 ± 1.2)·10(-2) and (10.4 ± 2.6)·10(-2), respectively.

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Figures

Figure 1
Figure 1
(A) Crystal structure of bismuth telluride. (B) Orientation of the electrodeposited film measured in this work.
Figure 2
Figure 2. X-ray diffractograms of Bi2Te3 film grown at pulsed electrodeposition.
The diffractogram y-axis is in log scale to hihglight that no other orientation is presented in the film.
Figure 3
Figure 3. SEM images of Bi2Te3 film.
(A) top view, and (B) cross section.
Figure 4
Figure 4. Electrical resistivity, Seebeck coefficient, and Power factor measured in-plane as a function of temperature.
Figure 5
Figure 5. Seebeck coefficient out-of-plane at room temperature.
(A) Seebeck coefficient distribution, and (B) Seebeck coefficient map as measured by the commertial system Seebeck microprobe.
Figure 6
Figure 6. Scheme of electrical conductivity set-up for the out-of-plane direction.
See this image and copyright information in PMC

References

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