Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 27: Joint Poster Session: Functionalized semiconductor nanowires (DS, jointly with HL); Resistive switching (DS, jointly with DF, KR, HL)
HL 27.17: Poster
Montag, 11. März 2013, 17:00–20:00, Poster B1
Thermoelectric power factor and full ZT characterization of Bi2Te3-nanowires — •Rüdiger Mitdank1, Danny Kojda1, Zhi Wang3, William Toellner2, Kornelius Nielsch2, Peter Woias3, and Saskia F. Fischer1 — 1Novel Materials, Institute of Physics, Humboldt Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany — 2Institute of Applied Physics, Universität Hamburg, Jungiusstr. 11, 20355 Hamburg, Germany — 3) IMTEK, University of Freiburg, D-79110 Freiburg
Thermoelectric (TE) properties of single Bi2Te3 nanowires (NW) were investigated using a TNCP (Thermoelectric characterization platform) which allows the determination of the Seebeck coefficient S, the conductivity σ and the thermal conductivity. The NW is deposited between 2 thin and freestanding Si-cantilevers. On each cantilever, 2 Pt-electrodes are arranged serving as microheater and thermometer. The calibration of the TNCP is discussed. In the temperature range 4,2K < T < 300K, the conductivity and the thermopower were measured. The function σ(T) corresponds to a rather metallic behaviour. The thermopower exhibits a maximum near 200 K. For a conductivity of nearly 1000S/cm the thermopower S(300K) varied between -35 μV/K and -50 μV/K. Experiments to determine the thermal conductivity are discussed.