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Self-Selecting Resistive Switching Scheme Using TiO2 Nanorod Arrays.

Chi-Hsin Huang1, Ta-Shun Chou1, Jian-Shiou Huang1

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This study introduces titanium dioxide (TiO2) nanorod arrays for resistive switching, demonstrating self-selecting behavior that suppresses leakage current and tackles sneak path issues in RRAM crossbar arrays.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrical Engineering

Background:

  • Resistive Random-Access Memory (RRAM) crossbar arrays face challenges with sneak path currents.
  • Integrating active devices to suppress these currents adds complexity and cost.

Purpose of the Study:

  • To report a resistive switching scheme using TiO2 nanorod arrays.
  • To demonstrate self-selecting behavior in these arrays to mitigate RRAM integration issues.

Main Methods:

  • Large-scale, low-cost hydrothermal synthesis of TiO2 nanorod arrays.
  • Characterization of nonlinear current-voltage (I-V) properties.
  • Analysis of resistive switching mechanisms.

Main Results:

  • Demonstrated nonlinear I-V characteristics with nonlinearity up to ~10.
  • Achieved leakage current suppression below 10^-4 Acm^-2.
  • Exhibited self-selecting resistive switching behavior in TiO2 nanorod arrays.
  • Estimated a maximum of 79 self-selecting RRAM cells per array.

Conclusions:

  • TiO2 nanorod arrays offer a simple pathway for RRAM crossbar array integration without extra devices.
  • The self-selecting resistive switching characteristics in a single material provide a novel strategy for addressing sneak path issues in RRAM.