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Scanning Electron Microscopy01:07

Scanning Electron Microscopy

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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
Fundamental Principles
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Overview of Microscopy Techniques01:22

Overview of Microscopy Techniques

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The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...
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Nuclear Overhauser Enhancement (NOE)01:07

Nuclear Overhauser Enhancement (NOE)

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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
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相关实验视频

Updated: May 15, 2025

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F&#8722;
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

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使用操作式光发射电子显微镜成像p-n连接点.

Elizaveta Pyatenko1, Shunsuke Nozawa1, Keiki Fukumoto1

  • 1Institute of Materials Structure Science (IMSS), High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan.

Nano letters
|April 9, 2025
PubMed
概括
此摘要是机器生成的。

我们开发了一种新的操作光发射电子显微镜 (PEEM) 方法,以实时可视化p-n连接带对齐和耗尽层. 这种技术揭示了电子结构的变化,这对于半导体设备的优化至关重要.

关键词:
电子结构 电子结构在操作中运行.光辐射电子光谱学 光辐射电子光谱学p-n 交叉点的交叉点半导体 半导体 半导体

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Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization
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Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization

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Nano-fEM: Protein Localization Using Photo-activated Localization Microscopy and Electron Microscopy
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Nano-fEM: Protein Localization Using Photo-activated Localization Microscopy and Electron Microscopy

Published on: December 3, 2012

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相关实验视频

Last Updated: May 15, 2025

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F&#8722;
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

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Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization
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Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization

Published on: July 17, 2015

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Nano-fEM: Protein Localization Using Photo-activated Localization Microscopy and Electron Microscopy
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Nano-fEM: Protein Localization Using Photo-activated Localization Microscopy and Electron Microscopy

Published on: December 3, 2012

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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 半导体物理 半导体物理

背景情况:

  • 了解偏差下的p-n连接行为对于半导体设备性能至关重要.
  • 在接口上对电子结构修改的直接可视化仍然具有挑战性.

研究的目的:

  • 开发和演示一种用于可视化p-n连接带对齐和耗尽层动态的新方法.
  • 在各种偏差条件下研究GaAs反向道二极管的电子结构.

主要方法:

  • 使用操作式光发射电子显微镜 (PEEM) 直接观察p-n接口的截面.
  • 在PEEM测量期间,向GaAs反向道二极管应用前向和反向偏差.

主要成果:

  • 成功可视化了外部电压依赖的能量波段对齐.
  • 在n型区域观察到的光谱特征,提供了在反向偏差下电子道化的证据.
  • 直接可视化了枯竭层及其随着反向偏差的增加而扩大.

结论:

  • 开发的PEEM方法可以在设备操作过程中直接可视化p-n连接器的修改.
  • 这种技术为了解半导体接口和提高设备效率提供了一个强大的工具.
  • 该方法广泛适用于各种半导体材料.