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Related Concept Videos

Fermi Level Dynamics01:12

Fermi Level Dynamics

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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
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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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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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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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Van der Waals Equation

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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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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.
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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Field Effect in Graphene-Based van der Waals Heterostructures: Stacking Sequence Matters.

Daniele Stradi1,2, Nick R Papior1,3, Ole Hansen4

  • 1Center for Nanostructured Graphene (CNG), Department of Micro- and Nanotechnology (DTU Nanotech), Technical University of Denmark , DK-2800, Kgs. Lyngby, Denmark.

Nano Letters
|March 7, 2017
PubMed
Summary

Flexible electronics rely on stacked 2D materials. Device performance hinges on how graphene contacts align with the gate, impacting transistor behavior and contact resistance. This guides ultrathin electronic design.

Keywords:
density functional theoryfield-effectgraphenenonequilibrium Green’s functiontransportvdW heterostructures

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Atomically thin electronics utilize stacked van der Waals (vdW) heterostructures.
  • Two-dimensional (2D) materials contacted by graphene electrodes offer potential for flexible devices.

Purpose of the Study:

  • Investigate the impact of stacking configuration on graphene-contacted MoS2 transistor performance.
  • Understand the role of contact region response to gate electric fields.

Main Methods:

  • First-principles quantum transport simulations.
  • Analysis of graphene-contacted Molybdenum disulfide (MoS2) devices.

Main Results:

  • Transistor effect is critically dependent on the stacking configuration.
  • Stacking influences the contact region's response to the gate's capacitive electric field.
  • Contact resistance is a key parameter affected by stacking.

Conclusions:

  • Stacking configuration is a crucial design parameter for 2D material-based ultrathin electronics.
  • Optimizing contact geometry is essential for device performance.
  • Provides a design rule for future flexible electronic devices.