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Related Concept Videos

Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

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...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

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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...
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

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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Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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Reducing Threading Dislocations of Single-Crystal Diamond via In Situ Tungsten Incorporation.

Ruozheng Wang1, Fang Lin1, Gang Niu2

  • 1Ministry Education Key Laboratory of Physical Electronics and Devices, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China.

Materials (Basel, Switzerland)
|January 21, 2022
PubMed
Summary

Incorporating tungsten during diamond growth significantly reduces crystal defects. This method improves the quality of single-crystal diamond substrates, crucial for high-performance electronic devices.

Keywords:
Raman spectroscopyXRDdislocationstungsten-incorporated diamond

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Crystal Growth

Background:

  • High-performance electronic devices require single-crystal diamond substrates with low dislocation density.
  • Existing methods for reducing dislocations in diamond are often insufficient for advanced applications.

Purpose of the Study:

  • To investigate the effectiveness of in-situ tungsten incorporation for reducing dislocation density in homoepitaxial diamond.
  • To evaluate the impact of tungsten incorporation on the crystal quality of diamond substrates.

Main Methods:

  • Homoepitaxial diamond growth on (001) diamond substrates using tungsten hexacarbonyl at high pressure and high temperature.
  • Characterization using Scanning Electron Microscopy (SEM) for etching pit density, X-ray Diffraction (XRD), and Raman Spectroscopy for crystal quality assessment.

Main Results:

  • Tungsten incorporation significantly altered diamond's atomic structure, inhibiting dislocation propagation.
  • Etching pit density decreased dramatically from 2.8 × 10^5 cm^-2 to 2.5 × 10^3 cm^-2.
  • Reduced Full Width at Half Maximum (FWHM) in XRD and Raman spectra indicated improved bulk crystal quality.

Conclusions:

  • In-situ tungsten incorporation is a viable strategy for enhancing the crystal quality of homoepitaxial diamond.
  • This technique effectively inhibits dislocation propagation, leading to higher quality diamond substrates.
  • The findings are significant for advancing the development of high-performance diamond-based electronic devices.