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Extraordinary Off-Stoichiometric Bismuth Telluride for Enhanced n-Type Thermoelectric Power Factor.
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.
Afiliación
  • Park K; Center for Nanoparticle Research, Institute for Basic Science (IBS) , Seoul 08826, Republic of Korea.
  • Cha J; Center for Nanoparticle Research, Institute for Basic Science (IBS) , Seoul 08826, Republic of Korea.
  • Lee S; Center for Nanoparticle Research, Institute for Basic Science (IBS) , Seoul 08826, Republic of Korea.
  • Chae SI; Center for Nanoparticle Research, Institute for Basic Science (IBS) , Seoul 08826, Republic of Korea.
  • Ryee S; Department of Physics and KAIST Institute for the NanoCentury, Korea Advanced Institute of Science and Technology , Daejeon 34141, Republic of Korea.
  • Im J; Thin Film Materials Research Center, Korea Research Institute of Chemical Technology , Daejeon 34114, Republic of Korea.
  • Lee J; Creative Research Center, Creative and Fundamental Research Division, Korea Electrotechnology Research Institute (KERI) , Changwon 51543, Gyeongsangnam-do, Republic of Korea.
  • Park SD; Creative Research Center, Creative and Fundamental Research Division, Korea Electrotechnology Research Institute (KERI) , Changwon 51543, Gyeongsangnam-do, Republic of Korea.
  • Han MJ; Department of Physics and KAIST Institute for the NanoCentury, Korea Advanced Institute of Science and Technology , Daejeon 34141, Republic of Korea.
  • Chung I; Center for Nanoparticle Research, Institute for Basic Science (IBS) , Seoul 08826, Republic of Korea.
  • Hyeon T; Center for Nanoparticle Research, Institute for Basic Science (IBS) , Seoul 08826, Republic of Korea.
J Am Chem Soc ; 138(43): 14458-14468, 2016 11 02.
Article en En | MEDLINE | ID: mdl-27763764
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.
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Banco de datos: MEDLINE Idioma: En Revista: J Am Chem Soc Año: 2016 Tipo del documento: Article
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Banco de datos: MEDLINE Idioma: En Revista: J Am Chem Soc Año: 2016 Tipo del documento: Article