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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...

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Updated: Jul 9, 2026

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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Published on: December 5, 2015

Low-resistance ohmic contacts for NbGeN3 enabled by cold metals.

Boyi Zeng1, Sijia Tang2, Nan Hu1

  • 1College of Information Engineering, Hainan Vocational University of Science and Technology, HaiKou Hainan 571126, China. bingzheng10@163.com.

Physical Chemistry Chemical Physics : PCCP
|July 8, 2026
PubMed
Summary

This study explores cold metals for reducing contact resistance in 2D devices. Four cold metals form stable n-type Ohmic contacts with NbGeN3, enabling efficient carrier injection and low-power electronics.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Reducing contact resistance is crucial for advancing two-dimensional (2D) electronic devices.
  • The Boltzmann limit presents a challenge for low-power electronics.
  • Cold metals with specific electronic properties offer a potential solution.

Purpose of the Study:

  • To investigate the interfacial contact properties between monolayer NbGeN3 and four candidate cold metals.
  • To evaluate the potential of these heterostructures for low-resistance carrier injection.
  • To identify suitable cold metal contacts for high-performance 2D electronic devices.

Main Methods:

  • Density functional theory (DFT) calculations were employed.
  • Systematic evaluation of interfacial contact properties.
  • Analysis of vertical and lateral contact characteristics.

Main Results:

  • All four heterostructures (NbSi2N4/NbGeN3, ReSe2/NbGeN3, Sc(OH)2/NbGeN3, Na3Bi/NbGeN3) exhibited stable n-type Ohmic contacts in the vertical direction.
  • Fermi level pinning due to metal-semiconductor interactions ensured contact stability.
  • Lateral contacts showed a mix of p-type Ohmic (ReSe2, Na3Bi, Sc(OH)2) and n-type Schottky (NbSi2N4) behavior.
  • A Schottky barrier of 0.32 eV was observed for NbSi2N4/NbGeN3.

Conclusions:

  • Monolayer NbGeN3 combined with specific cold metals can form effective n-type Ohmic contacts.
  • These heterostructures are promising for low-power and high-performance electronic applications.
  • The choice of cold metal influences the type of contact (Ohmic vs. Schottky) in the lateral direction.