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Giant Electroresistance in Ferroionic Tunnel Junctions.

Jiankun Li1, Ning Li2, Chen Ge3

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

Iscience
|June 21, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel ferroionic tunnel junction for advanced non-volatile memory. This device achieves giant electroresistance by combining ferroelectric and Schottky junction behaviors, paving the way for high-performance memory technologies.

Keywords:
DevicesInterface ScienceTransport Property of Condensed Matter

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Oxide-based resistive switching devices, such as ferroelectric tunnel junctions and resistance random access memory, are key candidates for next-generation non-volatile memory.
  • Achieving high ON/OFF ratios in these devices is crucial for practical applications in memory technology.

Purpose of the Study:

  • To propose and demonstrate a ferroionic tunnel junction capable of achieving giant electroresistance.
  • To engineer interfaces for novel resistive switching behaviors in ultrathin oxide heterostructures.

Main Methods:

  • Fabrication of a ferroionic tunnel junction using an ultrathin BaTiO3-δ layer as the ferroelectric barrier.
  • Utilizing a semiconducting Nb-doped SrTiO3 substrate as the bottom electrode.
  • Interface engineering through field-induced migration of oxygen vacancies to control switching states.

Main Results:

  • The device exhibits dual functionality, acting as a ferroelectric tunnel junction in the low resistance state and a Schottky junction in the high resistance state.
  • An extremely large electroresistance was achieved, with ON/OFF ratios of 5.1×107 at room temperature and 2.1×109 at 10 K.
  • Demonstrated the effectiveness of ionic controlled interface engineering in oxide heterostructures.

Conclusions:

  • The proposed ferroionic tunnel junction offers a promising pathway for developing high-performance resistive switching devices.
  • Interface engineering via ionic migration is an effective strategy for enhancing electroresistance in ultrathin oxide heterostructures.
  • This work highlights the potential of ferroionic devices for future non-volatile memory applications.