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High temperature thermoelectric properties of the tetradymite Bi.sub.2-x./sub.Pb.sub.x./sub.Te.sub.2./sub.Se (0 ≤ x ≤ 0.03)

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    0549432 - FZÚ 2022 RIV US eng J - Journal Article
    Léon, A. - Misra, S. - Levinský, Petr - Hejtmánek, Jiří - Wiendlocha, B. - Lenoir, B. - Candolfi, C.
    High temperature thermoelectric properties of the tetradymite Bi2-xPbxTe2Se (0 ≤ x ≤ 0.03).
    Applied Physics Letters. Roč. 119, č. 23 (2021), č. článku 232103. ISSN 0003-6951. E-ISSN 1077-3118
    R&D Projects: GA ČR GA18-12761S; GA MŠk(CZ) LM2018096
    Institutional support: RVO:68378271
    Keywords : thermoelectrics * materials synthesis and characterization * semiconductor doping * carrier concentration
    OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
    Impact factor: 3.791, year: 2020
    Method of publishing: Limited access
    https://doi.org/10.1063/5.0077166

    We report on the synthesis, characterizations, and high-temperature thermoelectric properties of polycrystalline samples of Bi2-xPbxTe2Se for 0 ≤ x ≤ 0.03. Powder x-ray diffraction and scanning electron microscopy confirm the successful insertion of Pb into the hexagonal unit cell of the tetradymite Bi2Te2Se. Pb acts as an acceptor-like impurity, gradually shifting the lightly doped, n-type electronic properties of Bi2Te2Se toward heavily doped, p-type properties in Pb-containing samples, which is additionally confirmed by electronic structure calculations. The increased degenerate character results in high power factors while maintaining low thermal conductivity values.
    Permanent Link: http://hdl.handle.net/11104/0325466

     
     
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