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Related Concept Videos

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:
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Carrier Generation and Recombination01:22

Carrier Generation and Recombination

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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
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P-N junction01:11

P-N junction

1.6K
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...
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Photoelectric Effect02:26

Photoelectric Effect

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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

1.3K
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...
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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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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.
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Charge Transfer Dynamics from Photoexcited Semiconductor Quantum Dots.

Haiming Zhu1, Ye Yang1, Kaifeng Wu1

  • 1Department of Chemistry, Emory University, Atlanta, Georgia 30322;

Annual Review of Physical Chemistry
|May 25, 2016
PubMed
Summary

Charge transfer from quantum dots (QDs) is key for nanomaterial applications. This review details QD charge transfer models, including Auger-assisted and Newns-Anderson theories, for better understanding and control.

Keywords:
Auger-assisted electron transferMarcus theoryNewns–Anderson modelelectron transferquantum dottime-resolved spectroscopy

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Area of Science:

  • * Materials Science
  • * Nanotechnology
  • * Physical Chemistry

Background:

  • * Photoinduced charge transfer in nanomaterials is critical for diverse technological applications.
  • * Quantum dots (QDs) serve as ideal model systems for studying charge transfer in low-dimensional nanomaterials due to quantum confinement effects.

Purpose of the Study:

  • * To review recent advancements in understanding charge transfer dynamics from quantum dots.
  • * To explore theoretical frameworks governing charge transfer in QDs, including Marcus nonadiabatic electron transfer (ET) theory and Auger-assisted ET models.
  • * To discuss strategies for controlling charge transfer properties in quantum-confined nanoheterostructures.

Main Methods:

  • * Analysis of charge transfer from QDs to weakly coupled acceptors using Marcus nonadiabatic ET theory.
  • * Application of the Auger-assisted ET model to account for strong electron-hole interactions in QDs.
  • * Description of strong coupling regimes using the Newns-Anderson model for QDs on semiconductor surfaces.

Main Results:

  • * Charge transfer rates from QDs depend on reorganization energy, electronic coupling, and driving force.
  • * The Auger-assisted ET model is crucial for describing ET from QDs, differing from molecular or bulk semiconductor systems.
  • * The Newns-Anderson model effectively describes donor-acceptor interactions in strongly coupled QDs on surfaces.

Conclusions:

  • * Understanding QD charge transfer requires specialized models like Auger-assisted ET and Newns-Anderson theory.
  • * Wavefunction engineering and multiple exciton dissociation offer pathways to control charge transfer in nanoheterostructures.
  • * Further research is needed to fully elucidate and harness QD charge transfer phenomena.