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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Uniform self-rectifying resistive random-access memory based on an MXene-TiO2 Schottky junction.

Chao Zang1,2, Bo Li1,2, Yun Sun1,2

  • 1Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China yunsun@imr.ac.cn wang@imr.ac.cn dmsun@imr.ac.cn.

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This study introduces a uniform resistive random-access memory (RRAM) device using a MXene-TiO2 Schottky junction. This novel approach improves device uniformity and reliability for advanced memory applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrical Engineering

Background:

  • Filamentary resistive random-access memory (RRAM) devices suffer from abrupt switching and poor uniformity due to random conductive filament formation.
  • Schottky barrier modulation at the electrode/oxide interface offers a pathway to enhance RRAM uniformity by controlling charge trapping/de-trapping.

Purpose of the Study:

  • To develop a highly uniform RRAM device utilizing a MXene-TiO2 Schottky junction.
  • To investigate the mechanism of resistive switching mediated by defect traps in MXene.

Main Methods:

  • Fabrication of a RRAM device based on a MXene-TiO2 Schottky junction.
  • Characterization of the device's resistive switching behavior, uniformity, reproducibility, retention, and endurance.
  • Analysis of the self-rectifying behavior arising from asymmetric interface barriers.

Main Results:

  • The MXene-TiO2 RRAM devices demonstrated excellent uniformity in current on-off ratio and device-to-device reproducibility.
  • The devices exhibited robust long-term retention and high endurance reliability.
  • A significant self-rectifying behavior with a rectifying ratio of 10^3 was achieved due to distinct interface barrier properties.

Conclusions:

  • The MXene-TiO2 Schottky junction effectively modulates the Schottky barrier via defect traps, enabling uniform resistive switching.
  • The developed RRAM devices show promising performance characteristics for practical applications.
  • The self-rectifying capability highlights the potential of MXene materials in large-scale RRAM integration.