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相关概念视频

Semiconductors01:22

Semiconductors

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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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Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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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.
The work...
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Metal-Semiconductor Junctions01:24

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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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VSEPR Theory and the Effect of Lone Pairs04:01

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Types of Semiconductors01:20

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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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Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
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二维半导体单层

Shao-Gang Xu1,2, Xiao-Tian Li1, Yu-Jun Zhao1

  • 1Department of Physics, South China University of Technology , Guangzhou 510640, People's Republic of China.

Journal of the American Chemical Society
|November 17, 2017
PubMed
概括
此摘要是机器生成的。

我们发现了新的半导体单层, 空位工程开辟了带间隙,使潜在的电子设备应用成为可能.

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科学领域:

  • 材料科学
  • 凝聚物质物理学
  • 固态化学

背景情况:

  • 两个维的 (2D) 材料以前预测并观察到是金属的.
  • 这种金属性质限制了它们在基于半导体的电子设备中的应用.

研究的目的:

  • 研究半导体单层的可能性.
  • 探索单层电子特性调整的方法.

主要方法:

  • 使用准粒子G0W0方法进行第一原理计算.
  • 电子带结构和轨道贡献的分析.
  • 研究结构稳定性和空置工程.

主要成果:

  • 发现了一种新型的半导体单层.
  • 电子频段缺口的开放归因于六边形空缺的连接网络.
  • 通过对平面内 (s+px,y) 和平面外 (pz) 轨道的空位进行操纵来证明带间隙工程.
  • 预测的单层表现出与实验观察到的稳定性.

结论:

  • 半导体单层与之前报告的金属有很大的不同.
  • 空置工程为设计基半导体提供了可行的途径.
  • 这些材料对未来的电子设备应用具有前景.