Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 41: Thermoelectric materials III: Heterostructures (Focused session – Organizers: Meyer, Heiliger)

DS 41.7: Vortrag

Freitag, 30. März 2012, 11:00–11:15, H 2032

Thermoelectric Transport in Bi₂Te₃/Sb₂Te₃ heterostructures — •Nicki F. Hinsche¹, Bogdan Yu. Yavorsky¹, Ingrid Mertig^1,2 und Peter Zahn¹ — ¹Martin-Luther-Universität, Institut für Physik, Von-Seckendorff-Platz 1, D-06120 Halle — ²Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle

Bi₂Te₃/Sb₂Te₃-heterostructures show a remarkable enhancement of the thermoelectric figure of merit compared to the bulk materials [1]. While gaining much attention in the last decade, the physical origin of this enhancement is still under debate. To contribute on this, we studied the electronic structure of Bi₂Te₃/Sb₂Te₃ heterostructures with a fully relativistic screened Korringa-Kohn-Rostoker Greens function method. The thermoelectric transport properties in-plane and cross-plane were calculated within the relaxation time approximation of the Boltzmann theory. The influence of composition, interfacial strain, and doping on the anisotropic thermoelectric properties were studied in detail [2,3].

[1] R. Venkatasubramanian, E. Siivola, T. Colpitts, and B. O’Quinn, Nature 413, 597 (2001). [2] N. F. Hinsche, B. Yu. Yavorsky, I. Mertig, and P. Zahn, Phys. Rev. B 84, 165214 (2011). [3] B. Yu. Yavorsky, N. F. Hinsche, I. Mertig, and P. Zahn, Phys. Rev. B 84, 165208 (2011).