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Controllable Schottky barriers between MoS2 and permalloy.

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|November 6, 2014
PubMed
Summary

Researchers developed ohmic contacts for molybdenum disulfide (MoS2) transistors using permalloy (Py). This breakthrough overcomes Schottky barriers, enabling improved spin transport and injection in 2D spintronic devices.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Molybdenum disulfide (MoS2) is a 2D material with excellent spin properties for electronics and spintronics.
  • A significant Schottky barrier at the MoS2-metal interface impedes spin transport and injection.
  • Understanding and mitigating this barrier is crucial for advancing MoS2-based devices.

Purpose of the Study:

  • To investigate the electrical contact properties of permalloy (Py) on both multilayer and monolayer MoS2.
  • To explore methods for reducing or eliminating the Schottky barrier at the MoS2-metal interface.
  • To enable efficient spin injection and transport in MoS2 spintronic applications.

Main Methods:

  • Fabrication of MoS2 devices with permalloy electrodes.
  • Electrical characterization of multilayer and monolayer MoS2 devices.
  • Tuning the Schottky barrier height using back gate voltage and Al2O3 insertion layers.

Main Results:

  • Achieved ohmic contact with a negative Schottky barrier for multilayer MoS2 and Py, resulting in high field-effect mobility (>55 cm²/Vs).
  • Demonstrated tunable Schottky barrier height (down to zero) for monolayer MoS2 by adjusting gate voltage and dielectric layer thickness.
  • Successfully mitigated the detrimental effects of the metal-semiconductor Schottky barrier.

Conclusions:

  • Ohmic contacts to MoS2 can be realized, significantly enhancing device performance.
  • Tunable Schottky barriers are achievable, paving the way for efficient spin injection and transport.
  • This work advances the development of high-performance MoS2-based transistors and spintronic devices.