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相关概念视频

Characteristics of MOSFET01:17

Characteristics of MOSFET

357
Metal-oxide-semiconductor field-effect Transistors, or MOSFETs, play a critical role in electronic circuits. They are primarily utilized for amplifying and switching signals.
Various vital parameters influence their functionality, which is crucial for theory and electronics applications. First, channel dimensions, precisely length, and width, are pivotal. The size of these channels affects the transistor's ability to carry current and switching speeds; shorter channels typically enable...
357
MOSFET01:16

MOSFET

440
The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
In an n-MOSFET, the structure includes n-type source and drain...
440
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

312
Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
312
MOS Capacitor01:25

MOS Capacitor

752
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
752
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

324
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...
324
MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

337
Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity...
337

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高性能WS2 MOSFET与双层WS2接触器一起使用

Lun Jin1,2, Jiaxuan Wen2, Michael Odlyzko3

  • 1Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States.

ACS omega
|July 29, 2024
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概括

本研究介绍了高性能场效应晶体管 (FET) 两层二硫化物 (WS2) 接触器. 这种混合方法提高了设备稳定性和开/关比,克服了二维材料电子方面的挑战.

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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
  • 半导体物理 半导体物理

背景情况:

  • 像二硫化 (WS2) 这样的单层过渡金属二甲基化物 (TMDC) 对缩放的MOSFET来说是有希望的.
  • 实现稳定,低障碍接触到单层TMDC仍然是一个重大挑战.

研究的目的:

  • 通过解决接触限制,开发基于WS2的高性能MOSFET.
  • 研究接触区域的双层WS2 (2L-WS2) 对设备性能和稳定性的影响.

主要方法:

  • 利用两步化学蒸汽沉积 (CVD) 过程在接触区域中生长2L-WS2.
  • 具有2L-WS2通道和混合型1L-WS2通道/2L-WS2接触结构的制造设备.
  • 用于设备制造的常规金属接触器 (Pd或Ni).

主要成果:

  • 实现了10^8.8.的高开/关电流比率 (ION/IOFF).
  • 在室温下显示的和排水电流 (ID(SAT)) 是280μA/μm (386μA/μm在78K).
  • 在具有混合通道厚度和13个月的优良稳定性的设备中观察到可比性能.

结论:

  • 采用混合通道厚度方法,在接触区域使用2L-WS2,有效地提高了WS2 MOSFET的性能.
  • 这种方法克服了接触挑战,使得基于二维材料的高性能和稳定的晶体管成为可能.
  • 这些发现为推进基于TMDC的电子产品提供了可行的战略.