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Related Experiment Videos

Work Function Tuning in Two-Dimensional MoS2 Field-Effect-Transistors with Graphene and Titanium Source-Drain

Seung Su Baik1, Seongil Im2, Hyoung Joon Choi2,3

  • 1School of Computational Sciences, Korea Institute for Advanced Study, Seoul 02455, Korea.

Scientific Reports
|March 31, 2017
PubMed
Summary

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We demonstrate tunable electronic band structures in graphene-MoS2 and Ti-MoS2 heterojunctions. Gate voltages easily control graphene

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene and Molybdenum disulfide (MoS2) are key 2D materials with unique electronic properties.
  • Heterostructures of these materials offer tunable electronic behavior for advanced devices.

Purpose of the Study:

  • Investigate the electronic band structures of graphene-MoS2 and Ti-MoS2 heterojunctions.
  • Explore the effect of gate voltages on band alignment and carrier concentrations.
  • Assess the potential for enhanced device performance in hybrid stacking devices.

Main Methods:

  • First-principles calculations were employed to simulate electronic band structures.
  • Simulations considered graphene-MoS2 and Ti-MoS2 heterojunctions.
  • Gate voltages and carrier concentrations were systematically varied.

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Main Results:

  • The Dirac point of graphene was easily modulated within the MoS2 bandgap by gate voltages.
  • Graphene's linear band structure remained intact around the Dirac point.
  • Band modulation was effective even when graphene and MoS2 bands were not aligned in reciprocal space.
  • Strong decoupling between graphene and MoS2 bands was observed.

Conclusions:

  • The facile modulation of graphene bands enhances gate-controlled switching in MoS2-graphene hybrid devices.
  • This flexibility offers a pathway for designing high-performance electronic switches.
  • The findings are applicable to both aligned and dislocated band configurations.