Thermoelectric performance of classical topological insulator nanowires

Abstract

There is currently substantial effort being invested into creating efficient thermoelectric nanowires based on topological insulator chalcogenide-type materials. A key premise of these efforts is the assumption that the generally good thermoelectric properties that these materials exhibit in bulk form will translate into similarly good or even better thermoelectric performance of the same materials in nanowire form. Here, we calculate thermoelectric performance of topological insulator nanowires based on Bi2Te3, Sb2Te3 and Bi2Se3 as a function of diameter and Fermi level. We show that the thermoelectric performance of topological insulator nanowires does not derive from the properties of the bulk material in a straightforward way. For all investigated systems the competition between surface states and bulk channel causes a significant modification of the thermoelectric transport coefficients if the diameter is reduced into the sub-10 um range. Key aspects are that the surface and bulk states are optimized at different Fermi levels or have different polarity as well as the high surface to volume ratio of the nanowires. This limits the maximum thermoelectric performance of topological insulator nanowires and thus their application in efficient thermoelectric devices.

References in corpus (9)

• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Energy Dissipation and Transport in Nanoscale Devices
• Impurity effect on weak anti-localization in the topological insulator Bi2Te3
• Enhanced Thermoelectric Performance and Anomalous Seebeck Effects in Topological Insulators
• Observation of Dirac Holes and Electrons in a Topological Insulator
• Surface State Transport and Ambipolar Electric Field Effect in Bi2Se3 Nanodevices
• Diameter Dependence of the Transport Properties of Antimony Telluride Nanowires
• Effects of Confinement and Orientation on the Thermoelectric Power Factor of Silicon Nanowires
• Resolving the Dirac Cone on the Surface of Bi2Te3 Topological Insulator Nanowires by Field-Effect Measurements

Cited by in corpus (4)

• Nanowires: A route to efficient thermoelectric devices
• Nonlinear Optical Observation of Coherent Acoustic Dirac Plasmons in Thin-Film Topological Insulators
• Thermoelectric Effects and Topological Insulators
• Thermoelectric refrigerator based on asymmetric surfaces of a magnetic topological insulator