Transfer Characteristics in Graphene Field-Effect Transistors with Co Contacts

TL;DR

This paper investigates the unusual transfer characteristics in short-channel graphene FETs with cobalt contacts, attributing the anomalies to contact-induced band modifications affecting device behavior.

Contribution

It identifies contact-induced effects as the cause of transfer characteristic anomalies in short-channel graphene FETs with cobalt contacts, providing insights into contact-channel interactions.

Findings

Anomalous transfer characteristics occur only in devices shorter than 3 micrometers.

Contact-induced band alterations are proposed as the mechanism behind the anomalies.

Short-channel devices exhibit distorted transfer curves due to contact effects.

Abstract

Graphene field-effect transistors with Co contacts as source and drain electrodes show anomalous distorted transfer characteristics. The anomaly appears only in short-channel devices (shorter than approximately 3 micrometers) and originates from a contact-induced effect. Band alteration of a graphene channel by the contacts is discussed as a possible mechanism for the anomalous characteristics observed.