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Elemental electrical switch enabling phase segregation-free operation.

Jiabin Shen1,2, Shujing Jia1,2, Nannan Shi3

  • 1State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 200050 Shanghai, China.

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|December 9, 2021
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Summary
This summary is machine-generated.

Researchers developed a novel single-element tellurium (Te) volatile switch for advanced memory chips. This switch offers high current density and fast switching speeds, simplifying materials for future high-density nonvolatile memory devices.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Solid-State Physics

Background:

  • Nonvolatile phase-change memory commercialization faces density scaling challenges below 10 nm.
  • Current selector switches, often Ovonic threshold switches (OTSs), rely on complex chalcogenide compositions.
  • Chemical complexity in OTSs hinders the development of homogeneous materials for advanced memory.

Purpose of the Study:

  • To introduce a simplified, single-element volatile switch for high-density memory applications.
  • To overcome the material complexity limitations of current amorphous-chalcogenide Ovonic threshold switches (OTSs).
  • To demonstrate a novel switching mechanism for next-generation memory devices.

Main Methods:

  • Fabrication and characterization of a single-element tellurium (Te) volatile switch.
  • Electrical measurements to determine current density, ON/OFF ratio, and switching speed.
  • Analysis of the switching mechanism involving Schottky barrier and crystal-liquid transition.

Main Results:

  • Achieved a large drive current density (≥11 MA/cm²) with a single-element Te switch.
  • Demonstrated a high ON/OFF current ratio of approximately 10³ and switching speed faster than 20 ns.
  • Identified a ~0.95 eV Schottky barrier at the Te–electrode interface contributing to low OFF current.
  • Observed a voltage pulse–induced crystal-liquid melting transition in pure Te enabling high ON current.

Conclusions:

  • A single-element tellurium (Te) volatile switch offers a promising alternative to complex chalcogenide switches.
  • The Te switch exhibits excellent electrical performance, including high current density and fast switching.
  • This discovery simplifies material requirements and may enable denser memory chip integration.