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Updated: Aug 12, 2025

Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
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Hysteresis-Free Contact Doping for High-Performance Two-Dimensional Electronics.

Po-Hsun Ho1,2, Jun-Ru Chang1, Chun-Hsiang Chen3

  • 1Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan.

ACS Nano
|January 30, 2023
PubMed
Summary
This summary is machine-generated.

A new two-step doping method effectively repairs defects in two-dimensional (2D) materials, enabling robust contact doping for high-performance 2D transistors and achieving record-high conductance in molybdenum disulfide (MoS2).

Keywords:
contact dopingcontact resistancehysteresisn-type dopingscanning tunneling microscopytransistorstwo-dimensional materials

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Contact doping is essential for reducing contact resistance in two-dimensional (2D) transistors.
  • A robust and effective method for contact doping of 2D materials is currently lacking.

Purpose of the Study:

  • To develop a novel two-step doping method for 2D materials.
  • To achieve strong, hysteresis-free doping and reduce contact resistance in 2D transistors.

Main Methods:

  • A two-step doping process involving defect repair was developed.
  • The method was applied to monolayer molybdenum disulfide (MoS2) and Au-contact devices.

Main Results:

  • Achieved a record-high sheet conductance of 0.16 mS·sq-1 for monolayer MoS2 without gating.
  • Obtained high mobility and carrier concentration (4.1 × 10^13 cm-2).
  • Demonstrated a low contact resistance of 1.2 kΩ·μm for a monolayer MoS2 device.

Conclusions:

  • The developed method provides effective and robust contact doping for 2D materials.
  • This technique is suitable for widely used transition-metal dichalcogenides.
  • The method enables the fabrication of high-performance 2D transistors.