Current crowding mediated large contact noise in graphene field-effect transistors

Paritosh Karnatak, T. Phanindra Sai, Srijit Goswami, Subhamoy Ghatak, Sanjeev Kaushal, Arindam Ghosh

Research output: Contribution to journalArticleScientificpeer-review

32 Citations (Scopus)

Abstract

The impact of the intrinsic time-dependent fluctuations in the electrical resistance at the graphene-metal interface or the contact noise, on the performance of graphene field-effect transistors, can be as adverse as the contact resistance itself, but remains largely unexplored. Here we have investigated the contact noise in graphene field-effect transistors of varying device geometry and contact configuration, with carrier mobility ranging from 5,000 to 80,000 cm 2 V-1 s-1. Our phenomenological model for contact noise because of current crowding in purely two-dimensional conductors confirms that the contacts dominate the measured resistance noise in all graphene field-effect transistors in the two-probe or invasive four-probe configurations, and surprisingly, also in nearly noninvasive four-probe (Hall bar) configuration in the high-mobility devices. The microscopic origin of contact noise is directly linked to the fluctuating electrostatic environment of the metal-channel interface, which could be generic to two-dimensional material-based electronic devices.

Original languageEnglish
Article number13703
JournalNature Communications
Volume7
DOIs
Publication statusPublished - 2016
Externally publishedYes

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