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Related Concept Videos

P-N junction01:11

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
Junction Potentials in Galvanic Cells01:21

Junction Potentials in Galvanic Cells

The Nernst equation, derived under the assumption of thermodynamic equilibrium, calculates the electromotive force (emf) as the sum of potential differences at phase boundaries in a reversible cell without a liquid junction. However, in irreversible cells such as the Daniell cell, an additional potential difference named the liquid-junction potential (EJ) arises across the interface of two electrolyte solutions due to different ion diffusion rates. This EJ represents the potential difference...
Debye–Huckel–Onsager Conductance Equation01:28

Debye–Huckel–Onsager Conductance Equation

The Debye-Hückel-Onsager equation is a cornerstone of physical chemistry, providing a method to determine the molar conductance (Λm) and molar conductance at infinite dilution (Λ°m) for uni-univalent electrolytes.Uni-univalent electrolytes are electrolytes that dissociate in solution to produce one cation with a +1 charge and one anion with a –1 charge per formula unit.This equation addresses two crucial phenomena: the asymmetry effect and the electrophoretic effect. According to this equation,...
Characteristics of JFET01:21

Characteristics of JFET

Junction Field Effect Transistors (JFETs) exhibit specific operational characteristics based on the relationship between the drain current (id) and the drain-source voltage (Vds), along with varying gate-source voltages (Vgs).
The core of a JFET's operation is controlling drain current by modulating the gate-source voltage. When the drain and gate voltage are set to zero, the JFET exhibits no net current flow, representing a state of equilibrium. The drain current increases linearly as the...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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 semiconductor's...
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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...

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Quantitative current-voltage characteristics in molecular junctions from first principles.

Pierre Darancet1, Jonathan R Widawsky, Hyoung Joon Choi

  • 1Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California, United States. pdarancet@lbl.gov

Nano Letters
|November 22, 2012
PubMed
Summary
This summary is machine-generated.

Accurate current-voltage measurements in molecular junctions are achieved using self-energy-corrected density functional theory (DFT). This method corrects errors in standard DFT, enabling precise prediction of charge transport properties.

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Area of Science:

  • Quantum Chemistry
  • Condensed Matter Physics
  • Materials Science

Background:

  • Molecular junctions are crucial for nanoscale electronics.
  • Standard density functional theory (DFT) often fails to accurately predict charge transport properties in molecular junctions.
  • Accurate prediction of current-voltage (IV) characteristics is essential for designing molecular electronic devices.

Purpose of the Study:

  • To accurately explain and predict current-voltage (IV) measurements of molecular junctions.
  • To improve upon the accuracy of standard DFT methods for charge transport calculations.
  • To develop a computationally inexpensive method for understanding charge transport at the molecular scale.

Main Methods:

  • Utilizing self-energy-corrected density functional theory (DFT).
  • Employing a coherent scattering-state approach.
  • Applying parameter-free many-electron self-energy corrections to DFT Kohn-Sham eigenvalues.
  • Proposing an approximate route based on linear response theory and Stark shifts.

Main Results:

  • Achieved quantitative accuracy in explaining IV measurements for pyridine-Au and amine-Au molecular junctions.
  • Demonstrated significant improvement over standard DFT, reducing order-of-magnitude errors in current calculations.
  • Showcased excellent agreement with experimental data at finite bias.
  • Proposed a predictive method for IV characteristics of symmetric and asymmetric junctions.

Conclusions:

  • Self-energy-corrected DFT provides a quantitatively accurate and computationally inexpensive description of coherent transport in molecular junctions.
  • This approach enables a deeper understanding and better control of charge transport properties in molecular-scale interfaces.
  • The findings pave the way for the rational design of molecular electronic devices with predictable performance.