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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.
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...
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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Formation of Complex Ions03:45

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Related Experiment Video

Updated: Feb 26, 2026

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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Contact Effect of ReS2/Metal Interface.

Jae Young Park1, Hang-Eun Joe1, Hyong Seo Yoon1

  • 1Department of Mechanical Engineering, Yonsei University , Seoul 120-749, Republic of Korea.

ACS Applied Materials & Interfaces
|July 19, 2017
PubMed
Summary

Rhenium disulfide (ReS2) shows promise for optoelectronics due to its stable band gap. Graphene electrodes minimize contact resistance in ReS2 transistors, enabling advanced nanologic devices.

Keywords:
Kelvin probe force microscopyReS2Schottky diodeTMDccontact resistancedensity functional theoryfield-effect transistorrhenium disulfide

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Rhenium disulfide (ReS2) is a 2D material with significant optoelectronic potential.
  • Its energy band gap is largely unaffected by layer thickness, making it attractive for devices.

Purpose of the Study:

  • To investigate the electrical band structure and work function of ReS2.
  • To evaluate contact resistance in ReS2 transistors with various electrodes.
  • To explore the potential for designing next-generation nanologic devices.

Main Methods:

  • Theoretical calculation of electrical band structure for mono-, bi-, and trilayer ReS2.
  • Experimental determination of ReS2 work function.
  • Contact resistance evaluation using the Y-function method with metal and graphene electrodes.

Main Results:

  • The work function of ReS2 was experimentally determined to be 4.8 eV and independent of layer thickness.
  • ReS2 exhibits strong n-type semiconducting behavior.
  • Graphene electrodes yielded the lowest contact resistance, indicating Fermi-level pinning at the ReS2/metal interface.

Conclusions:

  • The work function of ReS2 is layer-independent, simplifying device design.
  • Graphene electrodes are highly effective for minimizing contact resistance in ReS2 transistors.
  • These findings pave the way for developing advanced ReS2-based nanologic devices.