Probing Thermally Activated Atomic and Nanocrystalline Defect Motion through Noise Processes in RuO$_2$ Nanowires

TL;DR

This study investigates thermally activated defect motions in RuO₂ nanowires using electrical noise analysis, providing insights into defect dynamics crucial for nanodevice stability and performance.

Contribution

It introduces a noninvasive noise-based method to characterize atomic and nanocrystalline defect motions in nanowires at room temperature.

Findings

Identified energy distribution of oxygen vacancies.

Determined size and bonding strength of nanocrystallites.

Provided data on defect relaxation times.

Abstract

The present-day nanodevice dimensions continuously shrink, with the aim to prolong Moore's law. As downsizing meticulously persists, undesirable dynamic defects, which cause low-frequency noise and structural instability, play detrimental roles on limiting the ultimate performance and reliability of miniaturized devices. A good understanding and a meaningful control of the defect kinetics then become fundamental and urgent issues. Here we report observations of thermally activated atomic defect motion as well as nanocrystalline defect motion through electrical noise processes in metallic RuO$_2$ rutile nanowires around room temperature. First, we extract the energy distribution function and the number density of mobile atomic defects (oxygen vacancies). Second, we obtain the geometrical size, grain-boundary bonding strength, and relaxation times of dynamic nanocrystallites. Our results show clearly a powerful probe for effective and noninvasive characterizations of nanostructures and nanomaterials for which quantitative information about mechanical hardness, breakdown current density, and/or resistance noise is essential.