Thermoelectric properties of topological insulators

Abstract

Resumen del póster presentado al 1st Workshop Spain-Taiwan: "2D Materials and Interfaces for Spintronics", celebrado en Barcelona (España) del 23 al 25 de octubre de 2017.Topological Insulators (TIs) are some of the best thermoelectric materials. They are made of heavy elements that give a low phonon thermal conductivity and a small bandgap. Bi2Te3 is one of the best with a large figure of merit ZT. In this work, we take into account the Dirac states of TIs in the study case of thermoelectric properties. This can lead to improve the power factor. Different alloys of (Bi1-xSbx)2Te3 have been grown by MBE on a (111) Barium Fluoride substrate. Usual XPS measurements were made in order to see the different concentration. In addition, ARPES and Hall measurements combined to define the surface states. Finally, thermoelectric devices were designed by lithography in the objective to measure the Seebeck coefficient.Peer reviewe