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Open Access Nano Express

Molecular memory with atomically smooth graphene contacts

Ahmad Umair1, Tehseen Z Raza2 and Hassan Raza1*

Author Affiliations

1 Department of Electrical and Computer Engineering, University of Iowa, Iowa City, IA 52242, USA

2 Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242, USA

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Nanoscale Research Letters 2013, 8:476  doi:10.1186/1556-276X-8-476

Published: 14 November 2013

Abstract

We report the use of bilayer graphene as an atomically smooth contact for nanoscale devices. A two-terminal bucky-ball (C60) based molecular memory is fabricated with bilayer graphene as a contact on the polycrystalline nickel electrode. Graphene provides an atomically smooth covering over an otherwise rough metal surface. The use of graphene additionally prohibits the electromigration of nickel into the C60 layer. The devices exhibit a low-resistance state in the first sweep cycle and irreversibly switch to a high-resistance state at 0.8 to 1.2 V bias. In the subsequent cycles, the devices retain the high-resistance state, thus making it write-once read-many memory.

Keywords:
Graphene; Contact; Molecular memory; Write-once read-many; Bucky-ball