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Functional complex point-defect structure in a huge-size-mismatch system.

Ryo Ishikawa1, Naoya Shibata, Fumiyasu Oba

  • 1Institute of Engineering Innovation, University of Tokyo, 2-11-16, Yayoi, Bunkyo, Tokyo 113-8656, Japan.

Physical Review Letters
|February 26, 2013
PubMed
Summary
This summary is machine-generated.

Cubic boron nitride doped with cerium (Ce3+) ions reveals unique inclusion mechanisms. These dopants occupy nitrogen sites, not boron sites, and are associated with boron vacancies, crucial for optoelectronic applications.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Optoelectronics

Background:

  • Cubic boron nitride (c-BN) is a key material for photonics and optoelectronics.
  • Understanding dopant incorporation is essential for controlling material properties.

Purpose of the Study:

  • To elucidate the inclusion mechanisms of large-sized dopants, specifically cerium (Ce3+), in cubic boron nitride.
  • To provide insights for effective doping control in optoelectronic applications.

Main Methods:

  • Subangstrom resolution scanning transmission electron microscopy (STEM).
  • High-resolution imaging simulations.
  • First-principles calculations.

Main Results:

  • Cerium (Ce3+) dopants are not located at boron sites in c-BN.
  • Single Ce3+ dopants preferentially occupy anionic nitrogen sites.
  • These dopants are observed to be surrounded by boron-site vacancies.

Conclusions:

  • The study clarifies the site occupancy of Ce3+ in c-BN, challenging previous assumptions.
  • The findings are critical for optimizing c-BN for advanced photonic and optoelectronic devices.
  • This work lays the foundation for precise doping strategies in wide-bandgap semiconductors.