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相关概念视频

Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

215
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.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
215
The Hall Effect01:30

The Hall Effect

2.2K
Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
2.2K
Carrier Transport01:21

Carrier Transport

406
The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
406
Biasing of FET01:22

Biasing of FET

218
Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
218
Carrier Generation and Recombination01:22

Carrier Generation and Recombination

526
Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
526
Biasing of P-N Junction01:16

Biasing of P-N Junction

431
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...
431

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相关实验视频

Updated: Jun 9, 2025

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

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

Published on: August 2, 2019

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在InGaAs的倒置层移动性和接口陷密度从有门的大厅测量.

T Chidambaram1, D Veksler2, S Madisetti1

  • 1SUNY Polytechnic Institute, Albany, NY 12203, USA.

IEEE electron device letters : a publication of the IEEE Electron Devices Society
|October 31, 2024
PubMed
概括

封闭式霍尔法准确地测量了InGaAs MOSFET中的自由载体密度和电子流动性. 这种技术揭示了C-V方法的显著低估,并突出了边界陷对电子传输的影响.

关键词:
III-V MOSFETs 的使用情况.载体密度 载体密度 载体密度接口状态表示接口状态.移动性是一种流动性.散射机制是一种分散机制.

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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

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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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相关实验视频

Last Updated: Jun 9, 2025

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

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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
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Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization
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科学领域:

  • 半导体物理 半导体物理
  • 材料科学 材料科学 材料科学

背景情况:

  • 甲 (InGaAs) 金属氧化物半导体场效应晶体管 (MOSFET) 对于高速电子设备至关重要.
  • 准确地描述载体运输特性和接口质量对于设备优化至关重要.
  • 传统的电容-电压 (C-V) 方法经常高估通道载波密度,导致不准确的移动性估计.

研究的目的:

  • 使用封闭式Hall方法直接测量InGaAs MOSFET通道中的自由载体密度和电子流动性.
  • 为了比较封闭式Hall方法的准确性与晶体管特性和C-V测量.
  • 调查接口陷,包括边境陷,在InGaAs MOSFET中对载体运输的影响.

主要方法:

  • 通过封闭式霍尔法直接测量自由载体密度和电子流动性.
  • 分析取决于温度的电子流动性,以确定散射机制.
  • 使用封闭式大厅技术分离自由载体和被困电荷,以可靠地估计界面陷密度.

主要成果:

  • 在室温下电子密度约为1×1012 cm−2时观察到的最高霍尔运动率为1800 cm2/Vs.
  • 由于过高估计的通道密度,C-V测量显著低估了移动性.
  • 远程库伦散射被确定为在电子密度低于3×1011厘米-2.2的电子密度的主导机制.
  • 在III-V/高k接口上对接口陷密度 (包括边界陷) 的可靠估计.

结论:

  • 封闭式Hall方法提供了InGaAs MOSFET中载波密度和移动性的准确测量,超过了C-V方法.
  • 传导带上方的快速边界陷显著影响InGaAs通道,捕获多达一半的通道电子.
  • 这些被困电荷增加了切换能量和功率消耗,与 (Si) 设备不同,边界陷效应可以忽略不计.