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Applied Physics Letters / Volume 99 / Issue 11 / DEVICE PHYSICS

Appl. Phys. Lett. 99, 113501 (2011); http://dx.doi.org/10.1063/1.3634072 (3 pages)

Experimental evidence of ferroelectric negative capacitance in nanoscale heterostructures

Asif Islam Khan1, Debanjan Bhowmik1, Pu Yu2, Sung Joo Kim3, Xiaoqing Pan3, Ramamoorthy Ramesh2,4, and Sayeef Salahuddin1

1Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, USA
2Department of Physics, University of California, Berkeley, California 94720, USA
3Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
4Department of Material Science and Engineering, University of California, Berkeley, California 94720, USA

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(Received 22 February 2011; accepted 12 May 2011; published online 12 September 2011; corrected 20 September 2011)

We report a proof-of-concept demonstration of negative capacitance effect in a nanoscale ferroelectric-dielectric heterostructure. In a bilayer of ferroelectric Pb(Zr0.2Ti0.8)O3 and dielectric SrTiO3, the composite capacitance was observed to be larger than the constituent SrTiO3 capacitance, indicating an effective negative capacitance of the constituent Pb(Zr0.2Ti0.8)O3 layer. Temperature is shown to be an effective tuning parameter for the ferroelectric negative capacitance and the degree of capacitance enhancement in the heterostructure. Landau’s mean field theory based calculations show qualitative agreement with observed effects. This work underpins the possibility that by replacing gate oxides by ferroelectrics in nanoscale transistors, the sub threshold slope can be lowered below the classical limit (60 mV/decade).

© 2011 American Institute of Physics

EDITORIALLY RELATED

  1. Publisher's Note: “Experimental evidence of ferroelectric negative capacitance in nanoscale heterostructures” [Appl. Phys. Lett. 99, 113501 (2011)]
    Asif Islam Khan et al.
    Appl. Phys. Lett. 100, 089904 (2012)APPLAB000100000008089904000001

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KEYWORDS and PACS

Keywords

capacitance, ferroelectric materials, lead compounds, nanostructured materials, strontium compounds

PACS

  • 77.80.-e

    Ferroelectricity and antiferroelectricity

  • 77.84.Cg

    PZT ceramics and other titanates

  • 61.46.-w

    Structure of nanoscale materials

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3634072

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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    References

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