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Mechanism for Local-Atomic Structure Changes in Chalcogenide-based Threshold-Switching Devices.

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Summary
This summary is machine-generated.

Threshold switching in amorphous chalcogenides is linked to Se-Se defects. Modifying local structures improves selector device performance for 3D crossbar memories.

Keywords:
amorphous chalcogenidedefect analysislocal structurethreshold switchtrap dynamics

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Device Engineering

Background:

  • Amorphous chalcogenides are key for selector devices in 3D crossbar memories.
  • Understanding their threshold switching mechanism is limited by complex local structures and trap analysis challenges.
  • Local structures evolve post-switching due to unstable homopolar bonds.

Purpose of the Study:

  • To elucidate the threshold switching mechanism in amorphous chalcogenides.
  • To investigate the role of local structure evolution and trap dynamics.
  • To enhance the performance of threshold switching selector devices.

Main Methods:

  • Density Functional Theory (DFT) simulations.
  • Operando X-ray Photoelectron Spectroscopy (XPS) analysis.
  • Trap analysis and time-dependent trap evolution studies.

Main Results:

  • Threshold switching is fundamentally related to the charged state of Se-Se homopolar defects.
  • Modifying local structures with alloying elements enhances device performance.
  • Time-dependent trap evolution in local atomic structures was investigated.

Conclusions:

  • The charged state of Se-Se homopolar defects governs threshold switching.
  • Alloying elements and understanding trap dynamics are crucial for optimizing amorphous chalcogenide devices.
  • This research provides insights for designing improved amorphous chalcogenide-based memory selectors.