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나노입자 연구단
나노입자 연구단
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Extraordinary Off-Stoichiometric Bismuth Telluride for Enhanced n-Type Thermoelectric Power Factor

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Title
Extraordinary Off-Stoichiometric Bismuth Telluride for Enhanced n-Type Thermoelectric Power Factor
Author(s)
Kunsu Park; Ahn K.; Joonil Cha; Sanghwa Lee; Sue In Chae; Cho S.-P.; Ryee S.; Im J.; Lee J.; Park S.-D.; Han M.J.; In Chung; Taeghwan Hyeon
Publication Date
2016-11
Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.138, no.43, pp.14458 - 14468
Publisher
AMER CHEMICAL SOC
Abstract
Thermoelectrics directly converts waste heat into electricity and is considered a promising means of sustainable energy generation. While most of the recent advances in the enhancement of the thermoelectric figure of merit (ZT) resulted from a decrease in lattice thermal conductivity by nanostructuring, there have been very few attempts to enhance electrical transport properties, i.e., the power factor. Here we use nanochemistry to stabilize bulk bismuth telluride (Bi2Te3) that violates phase equilibrium, namely, phase-pure n-type K0.06Bi2Te3.18. Incorporated potassium and tellurium in Bi2Te3 far exceed their solubility limit, inducing simultaneous increase in the electrical conductivity and the Seebeck coefficient along with decrease in the thermal conductivity. Consequently, a high power factor of ≈43 μW cm-1 K-2 and a high ZT > 1.1 at 323 K are achieved. Our current synthetic method can be used to produce a new family of materials with novel physical and chemical characteristics for various applications. © 2016 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/3089
ISSN
0002-7863
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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