3D Hopping Conduction in SnO2 nanobelts

TL;DR

This study investigates the temperature-dependent electrical transport mechanisms in individual SnO2 nanobelts, revealing a sequence of conduction processes that demonstrate their three-dimensional conduction nature despite their nanobelt form.

Contribution

It identifies and characterizes four distinct conduction mechanisms in SnO2 nanobelts across a wide temperature range, highlighting their 3D transport behavior.

Findings

Thermal-Activation Conduction dominates above 314K

Nearest-Neighbor Hopping occurs between 115K and 268K

Variable Range Hopping is observed below 58K

Abstract

The temperature dependence of the electrical transport of a individual tin oxide nanobelt was measured, in darkness, from 400 to 5K. We found four intrinsic electrical transport mechanisms through the nanobelt. It starts with Thermal-Activation Conduction between 400 and 314K, Nearest-Neighbor Hopping conduction between 268 and 115K, and Variable Range Hopping conduction below 58K, with a crossover from the 3D-Mott to the 3D-Efros-Shklovskii regime at 16K. We claim that this sequence reveal the three-dimensional nature of the electrical transport in the SnO2 nanobelts, even they are expected to behave as one-dimensional systems.