Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 49: Energy materials: Thermoelectrics

HL 49.8: Vortrag

Dienstag, 1. April 2014, 15:45–16:00, POT 051

Thermoelectric power factor of ternary single-crystalline Sb2Te3- and Bi2Te3-based nanowires — •Svenja Bäßler1, Tim Böhnert1, Johannes Gooth1, Christian Schumacher1, Eckhard Pippel2, and Kornelius Nielsch11Institute of Applied Physics, Universität Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany — 2Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle, Germany

Nanowires of bismuth antimony telluride and bismuth telluride selenide (Bi15Sb29Te56 and Bi38Te55Se7) are grown by template-based pulsed electrodeposition. The composition and the crystallinity of the nanowires are determined by high resolution transmission electron microscopy. The thermoelectric properties (Seebeck coefficient and electrical conductivity) of single p- and n-type nanowires with a diameter of 80 nm and 200 nm, respectively, are determined as a function of temperature before and during heating in helium atmosphere up to 300 K along the growth direction of the nanowires. After additional annealing in Te atmosphere at 525 K, significantly enhanced transport properties are observed. Bulk-like power-factors are achieved. In Bi38Te55Se7 nanowires the Seebeck coefficients increase up to -115 µV K−1 and the thermoelectric power factors up to 2820 µW K−2 m−1 at room temperature. In Bi15Sb29Te56 nanowires Seebeck coefficients of up to +156 µV K−1 and power factors of up to 1750 µW K−2 m−1 are obtained at room temperature.


S. Bäßler et al. Nanotechnology 24 (2013) 495402

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