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Extraordinary off-stoichiometric bismuth telluride for enhanced n-type thermoelectric power factor

Cited 40 time in Web of Science Cited 42 time in Scopus
Authors
Park, Kunsu; Ahn, Kyunghan; Cha, Joonil; Lee, Sanghwa; Chae, Sue In; Cho, Sung-Pyo; Ryee, Siheon; Im, Jino; Lee, Jaeki; Park, Su-Dong; Han, Myung Joon; Chung, In; Hyeon, Taeghwan
Issue Date
2016-11
Citation
Journal of the American Chemical Society, Vol.138 No.43, pp.14458-14468
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 similar to 43 mu W 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.
ISSN
0002-7863
URI
http://hdl.handle.net/10371/165984
DOI
https://doi.org/10.1021/jacs.6b09222
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Chemical Convergence for Energy and Environment (에너지환경 화학융합기술전공)Journal Papers (저널논문_에너지환경 화학융합기술전공)
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