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Van der Waals Interactions01:24

Van der Waals Interactions

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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 an approximation that works well at high temperatures and low pressures. The van der Waals equation of state (named after the Dutch physicist Johannes van der Waals, 1837−1923) improves it by considering two factors.
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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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According to valence bond theory, a covalent bond results when: (1) an orbital on one atom overlaps an orbital on a second atom, and (2) the single electrons in each orbital combine to form an electron pair. The strength of a covalent bond depends on the extent of overlap of the orbitals involved. Maximum overlap is possible when the orbitals overlap on a direct line between the two nuclei.
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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Multifunctional high-performance van der Waals heterostructures.

Mingqiang Huang1, Shengman Li1, Zhenfeng Zhang1

  • 1Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.

Nature Nanotechnology
|October 10, 2017
PubMed
Summary
This summary is machine-generated.

Novel two-dimensional materials like black phosphorus and molybdenum disulfide enable advanced electronic devices. Researchers achieved ultrahigh rectifying and on-off ratios in vertical heterostructures, paving the way for tunable logic applications.

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Area of Science:

  • Materials Science
  • Electronics Engineering
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials are explored for advanced electronics due to their van der Waals heterostructure capabilities.
  • Existing 2D electronic devices often lack control over multifunctional operations.

Purpose of the Study:

  • To realize vertical heterostructures with superior rectifying and on-off ratios.
  • To design and fabricate tunable multivalue inverters for logic applications.

Main Methods:

  • Leveraging band-structure alignment of narrow-bandgap black phosphorus and large-bandgap molybdenum disulfide.
  • Fabricating vertical heterostructures and analyzing their electronic properties.
  • Designing and testing tunable multivalue inverters with controlled electric fields.

Main Results:

  • Achieved ultrahigh rectifying ratio (~10^6) and on-off ratio (~10^7) in vertical heterostructures.
  • Demonstrated tunable multivalue inverters with logic state and mid-logic window controlled by channel length and electric field.
  • Obtained high gains (>150) in optimized inverter geometries.

Conclusions:

  • Vertical heterostructures of black phosphorus and molybdenum disulfide offer exceptional electronic properties.
  • Tunable multivalue inverters show significant potential for future logic device applications.