Dresden 2020 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 30: Poster I
HL 30.40: Poster
Tuesday, March 17, 2020, 13:30–15:45, P3
Thermoelectric properties of Bi-based core/shell nanowires — •Maximilian Kockert1, Jeongmin Kim2, Hongjae Moon2, Danny Kojda1, Mahni Müller1, Rüdiger Mitdank1, Anna Mogilatenko3, S. Hoda Moosavi4, Michael Kroener4, Peter Woias4, Wooyoung Lee2, and Saskia F. Fischer1 — 1Novel Materials Group, Humboldt-Universität zu Berlin, 10099 Berlin, Germany — 2Departement of Materials Science and Engineering, Yonsei University, 03722 Seoul, Republic of Korea — 3Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, 12489 Berlin, Germany — 4Laboratory for Design of Microsystems (IMTEK), University of Freiburg, 79110 Freiburg, Germany
Bi-based core/shell nanowires are promising thermoelectric materials in order to improve the dimensionless figure of merit ZT=σ S2/λT, with the electrical conductivity σ, the Seebeck coefficient S, the thermal conductivity λ and the bath temperature T. The mismatch of the different lattice constants between the core (Bi) and the shell (Te or TiO2) lead to a strain-induced reduction of the band overlap in the Bi-core [1].
However, the determination of σ, S, λ and structural properties of the same individual [2] core/shell nanowire remains an open issue. Here, we present a complete temperature-dependent thermoelectric and structural characterization of an individual Bi/Te and Bi/TiO2 core/shell nanowire.
[1] J. Kim et al., Acta Materialia 144, 145 (2018).
[2] D. Kojda et al., Physical Review B 91, 024302 (2015).