Ferroelectric tunnel junctions with graphene electrodes.

Abstract:

:Polarization-driven resistive switching in ferroelectric tunnel junctions (FTJs)--structures composed of two electrodes separated by an ultrathin ferroelectric barrier--offers new physics and materials functionalities, as well as exciting opportunities for the next generation of non-volatile memories and logic devices. Performance of FTJs is highly sensitive to the electrical boundary conditions, which can be controlled by electrode material and/or interface engineering. Here, we demonstrate the use of graphene as electrodes in FTJs that allows control of interface properties for significant enhancement of device performance. Ferroelectric polarization stability and resistive switching are strongly affected by a molecular layer at the graphene/BaTiO3 interface. For the FTJ with the interfacial ammonia layer we find an enhanced tunnelling electroresistance (TER) effect of 6 × 10(5)%. The obtained results demonstrate a new approach based on using graphene electrodes for interface-facilitated polarization stability and enhancement of the TER effect, which can be exploited in the FTJ-based devices.

journal_name

Nat Commun

journal_title

Nature communications

authors

Lu H,Lipatov A,Ryu S,Kim DJ,Lee H,Zhuravlev MY,Eom CB,Tsymbal EY,Sinitskii A,Gruverman A

doi

10.1038/ncomms6518

subject

Has Abstract

pub_date

2014-11-24 00:00:00

pages

5518

issn

2041-1723

pii

ncomms6518

journal_volume

5

pub_type

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