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Related Experiment Video

Updated: Jan 27, 2026

Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
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Boron-oxygen complex yields n-type surface layer in semiconducting diamond.

Xiaobing Liu1,2, Xin Chen1,2, David J Singh3

  • 1School of Physics and Physical Engineering, Qufu Normal University, Qufu, 273165 Shandong, China; xiaobing.phy@qfnu.edu.cn chenxin@qfnu.edu.cn s-jacobsen@northwestern.edu.

Proceedings of the National Academy of Sciences of the United States of America
|April 3, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed n-type diamond using boron and oxygen defects, achieving high conductivity for advanced electronics. This breakthrough overcomes limitations in creating practical diamond-based devices.

Keywords:
borondefectsdiamondhigh pressuresemiconductor

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Semiconductor Research

Background:

  • Diamond's wide-bandgap properties offer potential for high-power electronics miniaturization.
  • Boron-doped diamond (BDD) is a known p-type semiconductor, but effective n-type doping remains a challenge for device fabrication.

Purpose of the Study:

  • To synthesize and characterize n-type diamond with satisfactory electrical properties.
  • To investigate the formation and impact of boron-oxygen (B-O) complex defects on diamond's conductivity.

Main Methods:

  • Synthesis of n-type diamond via high-pressure, high-temperature (HPHT) treatment of boron-doped diamond single crystals.
  • Characterization of a boron-rich surface layer and analysis of B-O complex defects.
  • First-principles calculations to elucidate the electronic structure of B-O complexes.

Main Results:

  • Achieved high carrier concentration (∼0.778 × 10^21 cm^-3) and high electrical conductivity in n-type diamond.
  • Identified B-O complexes, including B3O and B4O, as the source of shallow donor levels.
  • Demonstrated tunability of n-type conduction by controlling HPHT crystallization parameters.

Conclusions:

  • Successful synthesis of n-type diamond using B-O complex defects provides a viable pathway for advanced diamond electronics.
  • The B-O complex defect mechanism offers a new strategy for doping wide-bandgap semiconductors.
  • This research addresses a critical need for effective n-type doping in diamond for practical device applications.