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相关概念视频

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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 semiconductor's...
Semiconductors01:22

Semiconductors

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...
Types of Semiconductors01:20

Types of Semiconductors

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...
P-N junction01:11

P-N junction

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...
Superconductor01:24

Superconductor

A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
Schottky Barrier Diode01:27

Schottky Barrier Diode

Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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明亮的核心外半导体量子电线.

Yi-Hsin Liu1, Fudong Wang, Jessica Hoy

  • 1Department of Chemistry, Washington University , Saint Louis, Missouri 63130-4899, United States.

Journal of the American Chemical Society
|October 26, 2012
PubMed
概括
此摘要是机器生成的。

体 telluride (CdTe) 量子线可以实现高光发光效率高达25%的硫化 (CdS) 外. 电线的结构变化不会影响其光学特性或效率.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术
  • 光电学是指光电子产品.

背景情况:

  • 体量子线是光电子应用的有前途的纳米材料.
  • 在半导体纳米线中实现高光发光 (PL) 效率对于设备性能至关重要.
  • 由于其独特的光学特性,CdTe/CdS核心/外结构十分有趣.

研究的目的:

  • 报告 colloidal CdTe 量子电线中的高光发光效率.
  • 为了研究CdS外对CdTe量子线的光学特性的影响.
  • 为了确定结构交替对CdTe量子线的光电子特性的影响.

主要方法:

  • 合体CdTe量子线的合成.
  • 在CdTe量子电线上形成单层CdS外.
  • 在低激发功率密度下,光发光效率和光谱特性的表征.
  • 对结构性质的分析,包括石--混合物交替.

主要成果:

  • 对于带有CdS外的CdTe量子线,实现了高达25%的整体光发效率.
  • 证明CdS外显著提高了PL的效率.
  • 观察到光学特性 (排放峰值形状,PL效率) 是独立于CdTe量子线中的石--混合结构交替.

结论:

  • 单层CdS外形成是一种有效的策略,可以在合式CdTe量子线中实现高光发光效率.
  • 结构变化的存在不会对这些量子线的光学性能产生负面影响.
  • CdTe/CdS核心/外量子线是具有稳定的光学特性,适合各种应用的坚固材料.