Diameter Dependence of the Transport Properties of Antimony Telluride Nanowires

TL;DR

This study investigates how the electronic and thermoelectric properties of antimony telluride nanowires vary with diameter, revealing size-dependent enhancements and anisotropic magnetoresistance effects in single-crystal nanowires.

Contribution

It provides detailed measurements of transport properties in Sb2Te3 nanowires across different diameters, highlighting size-dependent thermoelectric and magnetoresistance behaviors.

Findings

Smaller diameter wires show increased thermoelectric power.

Strong anisotropic positive magnetoresistance observed.

Transport properties depend on nanowire diameter and orientation.

Abstract

We report measurements of electronic, thermoelectric, and galvanomagnetic properties of individual single crystal antimony telluride (Sb2Te3) nanowires with diameters in the range of 20-100 nm. Temperature dependent resistivity and thermoelectric power (TEP) measurements indicate hole dominant diffusive thermoelectric generation, with an enhancement of the TEP for smaller diameter wires up to 110 uV/K at T = 300 K. We measure the magnetoresistance, in magnetic fields both parallel and perpendicular to the nanowire [110] axis, where strong anisotropic positive magnetoresistance behavior was observed.