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Related Concept Videos

Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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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Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
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A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...

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Synthesis of Hierarchical ZnO/CdSSe Heterostructure Nanotrees
06:50

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Published on: November 29, 2016

Defect studies of ZnSe nanowires.

U Philipose1, Ankur Saxena, Harry E Ruda

  • 1Centre for Nanotechnology, University of Toronto, 170 College Street, Toronto, ON, M5S 3E4, Canada.

Nanotechnology
|July 7, 2011
PubMed
Summary

A new thermodynamic model estimates defect concentration in zinc selenide (ZnSe) nanowires. Positron annihilation spectroscopy validated model predictions, correlating structural and optical findings with defect levels.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Semiconductor Physics

Background:

  • Zinc selenide (ZnSe) nanowires exhibit defects like stacking faults and twinning, impacting their optical properties.
  • Defect-related emission is a significant factor in the photoluminescence spectra of ZnSe nanowires.

Purpose of the Study:

  • To develop a thermodynamic model for estimating defect concentration in ZnSe nanowires.
  • To explain experimental findings related to defects under varying selenium (Se) vapor pressure.
  • To validate the model using positron annihilation spectroscopy and other characterization techniques.

Main Methods:

  • Development of a simple thermodynamic model.
  • Growth of ZnSe nanowires under controlled Se vapor pressure.
  • Positron annihilation spectroscopy (PAS) for defect characterization.
  • Photoluminescence (PL) spectroscopy for optical analysis.
  • Structural characterization techniques.

Main Results:

  • The thermodynamic model successfully estimates defect concentration in ZnSe nanowires.
  • Positron annihilation spectroscopy provided the first defect characterization for nanowires, supporting the model's predictions.
  • Experimental results from structural and optical characterization align with the model's predictions.
  • Excess Se vapor pressure leads to the formation of Se nodules on nanowire sidewalls.

Conclusions:

  • The developed thermodynamic model is effective for predicting defect concentrations in ZnSe nanowires.
  • Positron annihilation spectroscopy is a viable technique for nanowire defect analysis.
  • Understanding defect formation is crucial for controlling ZnSe nanowire properties.
  • Optimizing Se vapor pressure is essential to prevent unwanted Se precipitation during vapor-liquid-solid growth.