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Preparation and Thermoelectric Properties of n-Type Bi2Te2.7Se0.3:D m

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Abstract

Bismuth chalcogenides such as p-type (Bi,Sb)2Te3 and n-type Bi2(Te,Se)3 are excellent thermoelectric materials near room temperature. They can form homogeneous solid solutions because Bi2Te3, Sb2Te3, and Bi2Se3 have the same class of crystal symmetry. The thermoelectric figure of merit can be improved by increasing the power factor through doping and/or by reducing the thermal conductivity by forming a solid solution. In this study, n-type Bi2Te2.7Se0.3:D m (D: dopant such as I, Cu, Ag) solid solutions were prepared by encapsulated melting and hot pressing. The undoped solid solution had a power factor (PF) of 1.71 mW m−1 K−1 at 323 K and a figure of merit (ZT) of 0.55 at 423 K. The ZT value was improved due to the increased PF by I or Cu doping, and maximum ZT values were obtained as 1.13 for Bi2Te2.7Se0.3:I0.0075 and 0.74 for Bi2Te2.7Se0.3:Cu0.01 at 423 K. However, the thermoelectric properties of Ag-doped Bi2Te2.7Se0.3 solid solutions barely improved.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Korea National University of Transportation, Chungju, Chungbuk, 380-702, Korea

    Go-Eun Lee, A-Young Eum, Kwon-Min Song & Il-Ho Kim

  2. Energy and Environmental Materials Division, Korea Institute of Ceramic Engineering and Technology, Seoul, 153-801, Korea

    Young Soo Lim & Won-Seon Seo

  3. SEEPEL Co. Ltd., Gunpo, Gyeonggi, 435-040, Korea

    Byeong-Jun Choi & Chang-Won Hwang

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  1. Go-Eun Lee
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Correspondence to Il-Ho Kim.

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Lee, GE., Eum, AY., Song, KM. et al. Preparation and Thermoelectric Properties of n-Type Bi2Te2.7Se0.3:D m . J. Electron. Mater. 44, 1579–1584 (2015). https://doi.org/10.1007/s11664-014-3485-7

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  • DOI: https://doi.org/10.1007/s11664-014-3485-7

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