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A Threshold Switching Selector Based on Highly Ordered Ag Nanodots for X-Point Memory Applications.

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Summary

Introducing silver nanodots into threshold switches overcomes limitations in X-point memory arrays. This innovation enables higher RESET currents, crucial for advanced memory technologies.

Keywords:
Ag nanodotscross‐pointone‐selector‐one‐resistor (1S1R)selectorsthreshold switch

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Solid-State Electronics

Background:

  • Leakage interference hinders the scalability of X-point memory arrays.
  • Metal-filament threshold switches offer selectivity but have insufficient on-state currents for memory RESET operations.

Purpose of the Study:

  • To enhance threshold switches for X-point memory arrays by enabling sufficient RESET currents.
  • To investigate the impact of silver nanodots on threshold switch performance.

Main Methods:

  • Incorporation of highly ordered silver (Ag) nanodots into the threshold switch structure.
  • Utilizing rapid thermal processing for Ag nanodot integration.
  • Quantized conductance measurements and simulation analysis to understand filament formation and rupture.

Main Results:

  • Achieved a sufficiently large RESET current (approximately 2.3 mA).
  • Ag nanodots prevented excessive Ag migration, promoting stable conductive filament growth.
  • Demonstrated a bidirectional, electroforming-free threshold switch with high selectivity (>10^9), ultralow leakage (<1 pA), and a steep slope (0.65 mV dec^-1).
  • Exhibited good thermal stability up to 200 °C.

Conclusions:

  • Silver nanodots are effective in boosting RESET currents for threshold switches in memory arrays.
  • The proposed Ag nanodot-based threshold switch offers superior performance and stability for one-selector-one-resistor configurations.