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Related Concept Videos

Non-ohmic Devices00:51

Non-ohmic Devices

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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.
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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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Types of Semiconductors

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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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P-N junction01:11

P-N junction

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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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Determination of Crystal Structures01:29

Determination of Crystal Structures

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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids
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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids

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Non-blinking semiconductor nanocrystals.

Xiaoyong Wang1, Xiaofan Ren, Keith Kahen

  • 1Department of Chemistry, University of Rochester, Rochester, New York 14627, USA.

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|May 12, 2009
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Summary
This summary is machine-generated.

Researchers developed non-blinking semiconductor nanocrystals. These CdZnSe/ZnSe nanocrystals show continuous photoluminescence, overcoming a major limitation for applications like single-photon sources and biological labeling.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Optics

Background:

  • Photoluminescence from molecules and nanocrystals exhibits 'blinking'—intermittent on/off intensity fluctuations.
  • Semiconductor nanocrystal blinking was theorized to result from temporary charge-induced quenching via non-radiative recombination.
  • Despite extensive research, achieving non-blinking nanocrystals and fully understanding blinking remains a challenge.

Purpose of the Study:

  • To synthesize and characterize semiconductor nanocrystals that exhibit continuous, non-blinking photoluminescence.
  • To investigate the photoluminescence properties of charged nanocrystals.
  • To understand the structural basis for non-blinking behavior in core/shell nanocrystals.

Main Methods:

  • Synthesis of ternary core/shell CdZnSe/ZnSe semiconductor nanocrystals.
  • Characterization of photoluminescence intensity, spectral shape, and lifetime under continuous photoexcitation.
  • Modeling of nanocrystal confinement potentials to elucidate structural properties.

Main Results:

  • Individual CdZnSe/ZnSe nanocrystals demonstrated continuous, non-blinking photoluminescence.
  • These nanocrystals exhibited strong photoluminescence despite being charged, evidenced by multi-peaked spectra and short lifetimes.
  • Structural analysis suggested a radially graded alloy composition rather than a sharp core/shell interface.

Conclusions:

  • The developed CdZnSe/ZnSe nanocrystals overcome the limitations of blinking in semiconductor nanocrystals.
  • Continuous photoluminescence from charged nanocrystals challenges previous assumptions about blinking mechanisms.
  • These non-blinking nanocrystals hold significant potential for applications requiring stable single-photon emission.