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Silicon compatible Sn-based resistive switching memory.

Sushant Sonde1, Bhaswar Chakrabarti, Yuzi Liu

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Summary
This summary is machine-generated.

Tin (Sn) offers a silicon-compatible alternative to copper and silver in conductive-bridge random-access memory (CBRAM) devices. This research demonstrates Sn-based CBRAM exhibits fast switching speeds and threshold switching comparable to traditional materials.

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Area of Science:

  • Materials Science
  • Solid-State Electronics
  • Semiconductor Devices

Background:

  • Solid-state memory is crucial for data-intensive computing, requiring scalable, energy-efficient, and fast non-volatile memory solutions.
  • Conductive-bridge random-access memory (CBRAM) uses filament formation/dissolution but relies on copper (Cu) or silver (Ag) anodes, which are problematic silicon contaminants.
  • A need exists for alternative anode materials that are compatible with silicon CMOS technology and avoid diffusion issues.

Purpose of the Study:

  • To identify and experimentally validate a silicon CMOS compatible anode material for CBRAM devices that replaces problematic Cu and Ag.
  • To investigate the switching characteristics and filament formation mechanisms in tin (Sn) based CBRAM devices.
  • To assess the performance of Sn-based CBRAM against established Cu/Ag based devices.

Main Methods:

  • Utilized first-principles calculations to estimate diffusion barriers in HfO2 and select suitable electrode metals.
  • Fabricated and experimentally tested conductive-bridge random-access memory (CBRAM) devices using tin (Sn) anodes.
  • Performed time-domain current-voltage (I vs. t) measurements under constant voltage stress to analyze filament formation and switching dynamics.

Main Results:

  • Identified tin (Sn) as a rational, silicon CMOS compatible anode material for CBRAM, replacing Cu and Ag.
  • Demonstrated Sn-based CBRAM devices exhibit very fast, steep-slope memory switching and threshold switching.
  • Observed Sn-based CBRAM performance comparable to Cu and Ag based devices, with switching times dependent on voltage stress and initial leakage current.

Conclusions:

  • Tin (Sn) is a viable and performant alternative anode material for conductive-bridge random-access memory (CBRAM) in silicon CMOS technology.
  • The study provides insights into the cationic filament formation and switching mechanisms in Sn-based CBRAM devices.
  • Sn-based CBRAM offers a promising pathway for developing next-generation, reliable, and high-performance solid-state memory solutions.