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Related Concept Videos

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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Related Experiment Video

Updated: Jun 28, 2025

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Tuneable Current Rectification Through a Designer Graphene Nanoribbon.

Niklas Friedrich1, Jingcheng Li1,2, Iago Pozo3

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

Advanced Materials (Deerfield Beach, Fla.)
|April 13, 2024
PubMed
Summary
This summary is machine-generated.

This study presents a mechanically tunable molecular diode with a record high rectification ratio (>10^5). By precisely controlling graphene nanoribbons with diboron doping, researchers achieved reversible current direction and efficient organic electronics.

Keywords:
STMelectronic transportgraphene nanoribbonmolecular diode

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Area of Science:

  • Organic electronics
  • Molecular electronics
  • Materials science

Background:

  • Unimolecular current rectifiers are essential for organic electronics.
  • Existing rectifiers have fixed efficiency due to molecule-metal interface limitations.
  • Electron-hole asymmetry in orbital levels typically dictates rectifying behavior.

Purpose of the Study:

  • To develop a mechanically tunable molecular diode with a high and reversible rectification ratio.
  • To explore precise manipulation of molecular electronic functionalities.
  • To advance the design of organic electronic devices.

Main Methods:

  • Synthesizing a diboron-doped seven-armchair graphene nanoribbon (GNR) using on-surface atomic precision.
  • Utilizing a low-temperature scanning tunneling microscope (STM) to suspend GNRs between a tip and gold substrate.
  • Investigating unipolar hole transport through boron in-gap state resonance.

Main Results:

  • Achieved an exceptionally large rectification ratio (>10^5) and reversible directionality.
  • Demonstrated tunable current rectification by mechanically altering barrier widths via tip-substrate distance.
  • Identified resonance in boron in-gap states enabling unipolar hole transport.

Conclusions:

  • Mechanically tuning molecular diodes offers precise control over electronic functionalities.
  • Diboron-doped GNRs represent a novel platform for high-performance molecular diodes.
  • This approach opens new possibilities for advanced organic electronic applications.