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Related Concept Videos

Non-ohmic Devices00:51

Non-ohmic Devices

1.4K
In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...
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Carrier Transport01:21

Carrier Transport

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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:
798
Controlled-Current Coulometry: Overview01:27

Controlled-Current Coulometry: Overview

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Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
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Electrical Current01:10

Electrical Current

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Electrical current is defined as the rate at which charge flows. When there is a large current present, such as that used to run a refrigerator, a large amount of charge moves through the wire in a small amount of time. If the current is small, such as that used to operate a handheld calculator, a small amount of charge moves through the circuit over a long period of time. The SI unit for current is the ampere (A), named for the French physicist André-Marie Ampère (1775–1836).
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Continuous Charge Distributions01:17

Continuous Charge Distributions

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Imagine a bucket of water. It contains many molecules, of the order of 1026 molecules. Thus, although it contains discrete elements (molecules) at the microscopic level, macroscopically, it can be considered continuous. Small volume elements of water, infinitesimal compared to the bulk of the bucket's volume, still contain many molecules. Under this framework, quantized matter is approximated as continuous for practical purposes.
The electric charge can also be subjected to an analogical...
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Mesh Analysis with Current Sources01:10

Mesh Analysis with Current Sources

1.8K
Mesh analysis becomes simpler when analyzing circuits with current sources, whether independent or dependent. The presence of current sources reduces the number of equations required for analysis. Two cases illustrate this:
Current Source in One Mesh: The analysis process is straightforward when a current source is found in only one mesh within the circuit. Mesh currents are assigned as usual, with the mesh containing the current source excluded from the analysis. Kirchhoff's voltage law...
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Related Experiment Video

Updated: Dec 11, 2025

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

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Single-Electron Currents in Designer Single-Cluster Devices.

Suman Gunasekaran1, Douglas A Reed1, Daniel W Paley1

  • 1Department of Chemistry, Columbia University, New York, New York 10027, United States.

Journal of the American Chemical Society
|August 19, 2020
PubMed
Summary
This summary is machine-generated.

Atomically precise clusters enable single-electron devices with tunable properties. By fusing clusters into dimers, researchers achieved higher currents and enhanced control over nanoscale charge transport for novel electronic materials.

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Area of Science:

  • Nanotechnology
  • Molecular Electronics
  • Quantum Dots

Background:

  • Single-electron devices are crucial for nanoscale electronics.
  • Current devices often use nanocrystals, limiting precise property control.
  • Atomically precise clusters offer a new platform for fabricating single-electron devices.

Purpose of the Study:

  • To design and investigate cobalt chalcogenide clusters for single-electron devices.
  • To control current-voltage (I-V) characteristics by tuning cluster properties.
  • To explore the potential of these molecular clusters in new electronic devices and materials.

Main Methods:

  • Fabrication of single-electron devices using atomically precise clusters and scanning tunneling microscope-based break junction (STM-BJ).
  • Modification of device geometry by adjusting ligand placement on cluster surfaces.
  • Chemical fusion of single clusters to form dimers and analysis of their electronic properties.

Main Results:

  • Demonstrated that I-V characteristics are independent of ligand placement, confirming single-electron tunneling.
  • Engineered cluster dimers that act as single electronic units with improved redox properties.
  • Observed significantly higher currents and current saturation in dimer-based devices compared to monomeric ones.

Conclusions:

  • Atomically precise cluster-based devices provide unprecedented control over electronic properties.
  • Cluster dimers exhibit enhanced performance, paving the way for advanced nanoscale charge transport studies.
  • These molecular clusters show promise as conductive inorganic nodes in future devices and materials.