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Key material parameters driving CBRAM device performances.

Ludovic Goux1, Janaki Radhakrishnan, Attilio Belmonte

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Summary

This study on Conductive Bridging Random Access Memory (CBRAM) devices reveals that denser chalcogenide electrolyte layers improve memory properties. Germanium-selenium (Ge-Se) electrolytes offer better retention and thermal stability than germanium-tellurium (Ge-Te).

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Area of Science:

  • Materials Science
  • Solid-State Electronics
  • Nanotechnology

Background:

  • Conductive Bridging Random Access Memory (CBRAM) devices are crucial for next-generation non-volatile memory.
  • Understanding material parameters is key to optimizing CBRAM performance, including memory properties and integration.
  • Chalcogenide electrolytes and copper (Cu) supply materials are central to CBRAM operation.

Purpose of the Study:

  • To identify key material parameters controlling memory properties in CBRAM devices.
  • To investigate the impact of electrolyte composition and density on CBRAM performance.
  • To compare the properties of Germanium-Selenium (Ge-Se) and Germanium-Tellurium (Ge-Te) based CBRAM.

Main Methods:

  • Fabrication of CBRAM devices integrated on CMOS select transistors.
  • Utilization of Ge-Se or Ge-Te electrolyte layers with varying compositions.
  • Extensive physical and electrical characterization of device performance.

Main Results:

  • Denser electrolyte layers, correlated with lower chalcogen atomic percentage, lead to slower write operations.
  • Ge-Se electrolytes exhibit higher write energy but superior state retention compared to Ge-Te electrolytes.
  • Ge-Se materials demonstrate enhanced processing thermal stability, facilitating integration.

Conclusions:

  • Electrolyte density and composition significantly influence CBRAM device characteristics.
  • Stronger Cu-Se chemical bonding stabilizes filaments and slows Cu cation motion, improving retention.
  • Ge-Se based CBRAM offers a promising pathway for robust memory applications with improved thermal stability.