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Materials 2017, 10(2), 154; doi:10.3390/ma10020154

Synthesis and Evaluation of Thick Films of Electrochemically Deposited Bi2Te3 and Sb2Te3 Thermoelectric Materials

1
Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
2
Micro/Nano-Machining Education and Research Center, Tohoku University, Sendai 890-8579, Japan
3
Microsystem Integration Center (μSIC), Tohoku University, Sendai 980-8579, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Christof Schneider
Received: 18 November 2016 / Revised: 1 February 2017 / Accepted: 2 February 2017 / Published: 10 February 2017
(This article belongs to the Section Energy Materials)

Abstract

This paper presents the results of the synthesis and evaluation of thick thermoelectric films that may be used for such applications as thermoelectric power generators. Two types of electrochemical deposition methods, constant and pulsed deposition with improved techniques for both N-type bismuth telluride (Bi2Te3) and P-type antimony telluride (Sb2Te3), are performed and compared. As a result, highly oriented Bi2Te3 and Sb2Te3 thick films with a bulk-like structure are successfully synthesized with high Seebeck coefficients and low electrical resistivities. Six hundred-micrometer-thick Bi2Te3 and 500-µm-thick Sb2Te3 films are obtained. The Seebeck coefficients for the Bi2Te3 and Sb2Te3 films are −150 ± 20 and 170 ± 20 µV/K, respectively. Additionally, the electrical resistivity for the Bi2Te3 is 15 ± 5 µΩm and is 25 ± 5 µΩm for the Sb2Te3. The power factors of each thermoelectric material can reach 15 × 10−4 W/mK2 for Bi2Te3 and 11.2 × 10−4 W/mK2 for Sb2Te3. View Full-Text
Keywords: thermoelectric materials; electrochemical deposition; annealing effects; thick films; thermoelectric power generators thermoelectric materials; electrochemical deposition; annealing effects; thick films; thermoelectric power generators
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Trung, N.H.; Sakamoto, K.; Toan, N.V.; Ono, T. Synthesis and Evaluation of Thick Films of Electrochemically Deposited Bi2Te3 and Sb2Te3 Thermoelectric Materials. Materials 2017, 10, 154.

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