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相关概念视频

Bridge rectifier01:24

Bridge rectifier

598
The bridge rectifier is essential in electronics for efficiently converting alternating current (AC) to direct current (DC). Comprised of four diodes configured in a bridge layout, this rectifier effectively processes both the positive and negative halves of the AC waveform, making it superior to half-wave and full-wave center-tapped rectifiers in terms of voltage regulation and output stability.
Operationally, the bridge rectifier allows current flow through two of its diodes during each...
598
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

253
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...
253
Biasing of FET01:22

Biasing of FET

268
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...
268
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

333
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...
333
Biasing of P-N Junction01:16

Biasing of P-N Junction

525
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...
525
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

772
In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
772

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Updated: Jun 28, 2025

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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可调节电流纠正通过一个设计师石墨烯纳米丝带.

Niklas Friedrich1, Jingcheng Li1,2, Iago Pozo3

  • 1CIC nanoGUNE-BRTA, Donostia-San Sebastián, 20018, Spain.

Advanced materials (Deerfield Beach, Fla.)
|April 13, 2024
PubMed
概括

这项研究介绍了一种机械调节的分子二极管,具有创纪录的高整正比率 (>10^5). 通过对石墨烯纳米带进行精确控制,研究人员实现了可逆电流方向和高效的有机电子.

关键词:
在STM中,STM是STM.电子运输是一种电子运输.石墨烯纳米丝带是什么意思分子二极管分子二极管

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科学领域:

  • 有机电子学有机电子学
  • 分子电子学分子电子学
  • 材料科学 是一种材料科学.

背景情况:

  • 单分子电流整流器对于有机电子是必不可少的.
  • 由于分子-金属接口的限制,现有的整流器具有固定的效率.
  • 轨道层中的电子孔不对称性通常决定了纠正行为.

研究的目的:

  • 开发一种机械调节的分子二极管,具有高和可逆的整正比率.
  • 探索分子电子功能的精确操纵.
  • 推进有机电子设备的设计.

主要方法:

  • 通过使用在表面的原子精度,合成一种二博添加的七个扶手椅石墨烯纳米丝带 (GNR).
  • 使用低温扫描道显微镜 (STM) 在尖端和黄金基板之间悬浮GNR.
  • 通过在隙状态共振研究单极孔传输.

主要成果:

  • 实现了异常大的整形比率 (>10 ^ 5) 和可逆方向性.
  • 通过通过尖端-基板距离机械改变屏障宽度来证明可调节的电流校正.
  • 在内部空隙状态中识别了共振,使单极孔运输成为可能.

结论:

  • 机械调节分子二极管可以精确控制电子功能.
  • 用二博添加的GNR代表了高性能分子二极管的新平台.
  • 这种方法为先进的有机电子应用开辟了新的可能性.