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Gate-driven band modulation hyperdoping for high-performance p-type 2D semiconductor transistors.

Bei Zhao1,2, Zucheng Zhang1, Junqing Xu3

  • 1Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory of Chemo and Biosensing, College of Chemistry and Chemical Engineering, Hunan University, Changsha, China.

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Summary
This summary is machine-generated.

Researchers achieved hyperdoping in two-dimensional (2D) semiconductors using interlayer charge-transfer doping. This method significantly boosted carrier density, enabling high-performance 2D transistors with record ON-state current.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Controlling carrier density in atomically thin two-dimensional (2D) semiconductors is difficult due to limited space for dopants.
  • Existing doping methods face challenges in achieving high carrier concentrations without compromising material integrity.

Purpose of the Study:

  • To investigate interlayer charge-transfer doping in type III van der Waals heterostructures for enhanced carrier density modulation.
  • To explore the potential of external gate modulation to achieve a hyperdoping effect in 2D semiconductors.
  • To demonstrate high-performance p-type 2D transistors enabled by this doping strategy.

Main Methods:

  • Fabrication of type III van der Waals heterostructures.
  • Application of external gate voltage for modulation of interlayer charge transfer.
  • Systematic gated-Hall measurements to quantify carrier density and mobility.

Main Results:

  • Achieved a modulated carrier density approximately five times the gate capacitive charge, demonstrating a hyperdoping effect.
  • Realized an ultrahigh two-dimensional (2D) hole density of 1.49 × 1014 cm-2, surpassing typical electrostatic doping limits.
  • Fabricated high-performance p-type 2D transistors exhibiting ultralow contact resistance (~0.041 kΩ·μm) and a record ON-state current density (~2.30 mA/μm).

Conclusions:

  • External gate-modulated interlayer charge-transfer doping is a highly effective strategy for achieving hyperdoping in 2D semiconductors.
  • This approach overcomes the limitations of conventional doping methods and enables ultrahigh carrier densities.
  • The developed method paves the way for advanced 2D electronic devices with superior performance characteristics.