The Role of Electrical and Thermal Contact Resistance for Joule Breakdown of Single-Wall Carbon Nanotubes

TL;DR

This paper investigates how electrical and thermal contact resistances influence Joule breakdown in single-wall carbon nanotubes, revealing universal scaling laws and the dominant role of contact resistances in heat dissipation.

Contribution

It introduces analytical models explaining the breakdown power scaling in SWNTs, emphasizing the impact of contact resistances on Joule breakdown behavior.

Findings

Universal scaling of breakdown power with nanotube length

Contact resistances govern heat sinking and breakdown limits

Minimum breakdown power observed at intermediate lengths

Abstract

Several data sets of electrical breakdown in air of single-wall carbon nanotubes (SWNTs) on insulating substrates are collected and analyzed. A universal scaling of the Joule breakdown power with nanotube length is found, which appears independent of the insulating substrates used or their thickness. This suggests the thermal resistances at the interface between SWNT and insulator, and between SWNT and electrodes, govern heat sinking from the nanotube. Analytical models for the breakdown power scaling are presented, providing an intuitive, physical understanding of the breakdown process. The electrical and thermal resistance at the electrode contacts limit the breakdown behavior for sub-micron SWNTs, the breakdown power scales linearly with length for microns-long tubes, and a minimum breakdown power (~ 0.05 uW) is observed for the intermediate (~ 0.5 um) length range.