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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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The ideal gas law is based on two simplifying assumptions: first, that there are no intermolecular attractions between gas molecules, and second, that the volume occupied by the molecules themselves is negligible compared with the volume of the container. However, these assumptions don't hold up under all conditions - specifically, at high pressures and low temperatures, as gas tends to deviate from ideal gas behavior.The van der Waals equation is an enhanced version of the ideal gas law,...
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Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
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Near-Ideal van der Waals NbSe2 Contacts for WSe2 CMOS Electronics.

Hyungyu Choi1, Yunseo Song1, Nasir Ali2

  • 1SKKU Advanced Institute of Nano Technology (SAINT) and Department of Nano Science and Technology, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Korea.

Nano Letters
|April 10, 2026
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Summary

Metallic van der Waals (vdW) contacts using NbSe2 overcome Fermi-level pinning in 2D semiconductors. This enables efficient carrier injection and high-performance WSe2 transistors and complementary metal-oxide-semiconductor (CMOS) devices.

Keywords:
2D semiconductorFermi-level pinningfield-effect transistorsvan der Waals contact

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Reliable, low-resistance contacts are crucial for two-dimensional (2D) semiconductor devices.
  • Fermi-level pinning (FLP) at metal-semiconductor interfaces hinders carrier injection and masks intrinsic transport properties.
  • Conventional metal contacts often exhibit high Schottky barriers, limiting device performance.

Purpose of the Study:

  • To demonstrate the effectiveness of metallic van der Waals (vdW) contacts for 2D semiconductor devices.
  • To investigate the impact of NbSe2 contacts on WSe2 field-effect transistor (FET) performance.
  • To enable high-performance 2D electronics by suppressing FLP.

Main Methods:

  • Fabrication of WSe2 field-effect transistors (FETs) utilizing transferred NbSe2 as metallic vdW contacts.
  • Characterization of device performance, including p-type characteristics, ohmic behavior, and on/off ratios.
  • Temperature-dependent measurements to determine Schottky barrier height.
  • Four-point-probe measurements to assess contact resistance and transport characteristics.
  • Integration of p-type NbSe2 and n-type Sb contacts for complementary metal-oxide-semiconductor (CMOS) inverter fabrication.

Main Results:

  • NbSe2 contacts enabled near-ideal p-type operation in WSe2 FETs, exhibiting clear p-type characteristics and high on/off ratios.
  • Significantly reduced Schottky barrier height (∼0.06 eV) was observed with NbSe2 contacts compared to conventional Pt contacts (∼0.26 eV).
  • Low contact resistance and channel-dominated transport confirmed efficient carrier injection across the vdW interface.
  • A dopant-free complementary metal-oxide-semiconductor (CMOS) inverter was successfully realized.

Conclusions:

  • Metallic vdW contacts, specifically NbSe2, are an effective strategy to overcome Fermi-level pinning (FLP) in 2D semiconductors.
  • This approach enables efficient carrier injection and unlocks high-performance operation in WSe2-based devices.
  • The demonstrated vdW contact strategy paves the way for advanced 2D electronic applications, including CMOS circuits.