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Hydrogen incorporation in diamond: the vacancy-hydrogen complex
Claire Glover1, M E Newton, P M Martineau
1Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom.
Physical Review Letters
|April 20, 2004
Summary
We identified a vacancy-hydrogen complex in single crystal diamond using chemical vapor deposition. This S=1 defect, observed via electron paramagnetic resonance, reveals unique bonding and electronic properties distinct from silicon defects.
Area of Science:
- Materials Science
- Solid-State Physics
- Quantum Chemistry
Background:
- Single crystal diamond is a promising material for quantum applications.
- Defects in diamond, such as vacancies, significantly influence its electronic and optical properties.
- Understanding defect structures is crucial for material design and performance.
Purpose of the Study:
- To identify and characterize the vacancy-hydrogen complex in single crystal diamond.
- To investigate the bonding and electronic structure of this defect.
- To compare its properties with analogous defects in other semiconductors like silicon.
Main Methods:
- Synthesis of single crystal diamond using chemical vapor deposition (CVD).
- Electron paramagnetic resonance (EPR) spectroscopy to detect and analyze the defect.
- Theoretical analysis to explain hyperfine interactions and electronic delocalization.
Main Results:
- Identification of the vacancy-hydrogen complex in the negative charge state (S=1 defect).
- Observation of hydrogen bonded to a neighboring carbon atom, adjacent to the vacancy.
- Absence of symmetry-lowering reconstruction of dangling orbitals, unlike in silicon.
- Explanation of the small hydrogen hyperfine interaction via dipolar coupling to delocalized electron density on neighboring carbons.
Conclusions:
- The vacancy-hydrogen complex in diamond exhibits distinct structural and electronic properties compared to silicon.
- The delocalized electron density on neighboring carbon atoms plays a key role in the defect's characteristics.
- This detailed understanding advances the control and utilization of defects in diamond for advanced applications.