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)

0549432 - FZÚ 2022 RIV US eng J - Článek v odborném periodiku
Léon, A. - Misra, S. - Levinský, Petr - Hejtmánek, Jiří - Wiendlocha, B. - Lenoir, B. - Candolfi, C.
High temperature thermoelectric properties of the tetradymite Bi_2-xPb_xTe₂Se (0 ≤ x ≤ 0.03).
Applied Physics Letters. Roč. 119, č. 23 (2021), č. článku 232103. ISSN 0003-6951. E-ISSN 1077-3118
Grant CEP: GA ČR GA18-12761S; GA MŠMT(CZ) LM2018096
Institucionální podpora: RVO:68378271
Klíčová slova: thermoelectrics * materials synthesis and characterization * semiconductor doping * carrier concentration
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.971, rok: 2021
Způsob publikování: Omezený přístup
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.
Trvalý link: http://hdl.handle.net/11104/0325466