Performance of Solution Processed Carbon Nanotube Field Effect Transistors with Graphene Electrodes

TL;DR

This study investigates the performance of carbon nanotube FETs with graphene electrodes, revealing near-zero barrier heights and Ohmic contacts, with no dependence on graphene thickness.

Contribution

It provides experimental analysis of barrier heights at CNT-graphene junctions, demonstrating Ohmic contact behavior and independence from graphene layer thickness.

Findings

Barrier height close to zero for holes and electrons

Graphene forms Ohmic contact with CNTs

No correlation between barrier height and graphene thickness

Abstract

This work evaluates the performance of carbon nanotube field effect transistors (CNTFET) using few layer graphene as the contact electrode material. We present the experimental results obtained on the barrier height at CNT graphene junction using temperature dependent IV measurements. The estimated barrier height in our devices for both holes and electrons is close to zero or slightly negative indicating the Ohmic contact of graphene with the valence and conduction bands of CNTs. In addition, we also report that there is no correlation between the barrier height and thickness of graphene.