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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Solid-State Physics

Background:

  • Resistive Random-Access Memory (RRAM) is a promising non-volatile memory technology.
  • Achieving high device integrity with low operating power and stable performance remains a challenge.

Purpose of the Study:

  • To develop and characterize a Ni/SiGeO/TiO/TaN based resistive memory device.
  • To investigate the potential of SiGeO and TiO materials for forming-free switching and enhanced memory characteristics.

Main Methods:

  • Fabrication of Ni/SiGeO/TiO/TaN stacks.
  • Electrical characterization including switching behavior, endurance, retention, and resistance window analysis.
  • Analysis of material properties influencing device performance, focusing on oxygen vacancy density and grain boundary defects.

Main Results:

  • Achieved forming-free switching with low switching power (790 μW).
  • Demonstrated stable endurance (10^4 cycles), optimal retention (10^5 s), and a large resistance window (>1150×).
  • Observed tight current distributions at 85 °C, indicating robust device integrity.

Conclusions:

  • The Ni/SiGeO/TiO/TaN device offers optimal integrity and forming-free switching.
  • High oxygen vacancy density in SiGeO and defective TiO grain boundaries are key to the observed low current switching and excellent performance.