Thermoelectric characteristics of a single-crystalline topological insulator bi2 se3 nanowire

Abstract

The discovery of topological insulators (TIs) has motivated detailed studies on their physi-cal properties, especially on their novel surface states via strong spin–orbit interactions. However, surface-state-related thermoelectric properties are rarely reported, likely because of the involve-ment of their bulk-dominating contribution. In this work, we report thermoelectric studies on a TI bismuth selenide (Bi2 Se3) nanowire (NW) that exhibit a larger surface/volume ratio. Uniform single-crystalline TI Bi2 Se3 NWs were successfully synthesized using a stress-induced growth method. To achieve the study of the thermoelectric properties of a nanowire (NW), including electrical conductivity (σ), Seebeck coefficient (S), and thermal conductivity (κ), a special platform for simultaneously performing all measurements on a single wire was designed. The properties of σ, S, and κ of a 200 nm NW that was well precharacterized using transmission electron microscope (TEM) measurements were determined using the four-probe method, the two-probe EMF across ∇T measurement, and the 3ω technique, respectively. The integrated TE properties represented by the figure of merit ZT (S2 σT/κ) were found to be in good agreement with a theoretical study of Bi2 Se3 NW.