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Related Concept Videos

P-N junction01:11

P-N junction

1.6K
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Semiconductors01:22

Semiconductors

1.8K
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

1.3K
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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The Electrical Double Layer01:30

The Electrical Double Layer

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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
116
Types of Semiconductors01:20

Types of Semiconductors

1.7K
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Biasing of P-N Junction01:16

Biasing of P-N Junction

2.4K
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
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Interlayer Potential for Graphene/h-BN Heterostructures.

Itai Leven1, Tal Maaravi1, Ido Azuri2

  • 1Department of Physical Chemistry, School of Chemistry, The Raymond and Beverly Sackler Faculty of Exact Sciences and The Sackler Center for Computational Molecular and Materials Science, Tel Aviv University , Tel Aviv 6997801, Israel.

Journal of Chemical Theory and Computation
|May 12, 2016
PubMed
Summary
This summary is machine-generated.

We developed a new force-field potential for graphene and hexagonal boron nitride (h-BN) heterostructures. This model accurately predicts interlayer interactions and structural properties, crucial for advanced material design.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Condensed Matter Physics

Background:

  • Graphene and hexagonal boron nitride (h-BN) heterostructures are key materials for advanced electronic and mechanical applications.
  • Accurate modeling of interlayer interactions is crucial for predicting the properties of these 2D materials.

Purpose of the Study:

  • To develop and validate a new force-field potential for describing interlayer interactions in graphene/h-BN heterostructures.
  • To enable accurate simulations of structural, mechanical, and dynamic properties.

Main Methods:

  • A new force-field potential with long-range attractive and short-range anisotropic repulsive terms was formulated.
  • Parameters were calibrated using density functional theory (DFT) calculations with a hybrid functional and many-body dispersion treatment.
  • The potential's transferability was tested on finite dimer systems, periodic bilayers, and bulk stacks.

Main Results:

  • The force-field accurately reproduces binding and sliding energies for graphene/h-BN systems.
  • Benchmark calculations for superlattices show good agreement with experimental and previous computational data.
  • A highly corrugated relaxed structure is predicted for free-standing graphene/h-BN bilayers, impacting monolayer properties.

Conclusions:

  • The developed force-field is a reliable tool for modeling graphene/h-BN heterostructures.
  • It can be used to investigate structural, mechanical, tribological, and dynamic properties.
  • The findings are significant for the design and application of novel 2D material-based devices.