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Shallow donor state due to nitrogen-hydrogen complex in diamond.
Takehide Miyazaki1, Hideyo Okushi, Tsuyoshi Uda
1Advanced Semiconductor Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, AIST Tsukuba Central 4, Tsukuba 305-8562, Japan.
Physical Review Letters
|February 28, 2002
Summary
We propose that nitrogen (N) donors in diamond may be shallower than previously thought. A complex N-H-N defect is likely much shallower, supported by recent muonium center discoveries in N-rich diamond.
Area of Science:
- Solid-state physics
- Materials science
- Quantum chemistry
Background:
- Nitrogen (N) is a common impurity in diamond, acting as a deep donor.
- Understanding donor behavior is crucial for diamond-based electronic and optical applications.
Purpose of the Study:
- To investigate the electronic properties of nitrogen donors in diamond using ab initio calculations.
- To explore the possibility of shallower donor states and complex defect structures.
Main Methods:
- Ab initio calculations to model defect structures and electronic properties.
- Theoretical investigation of nitrogen-hydrogen-nitrogen (N-H-N) complex defects.
Main Results:
- Proposed a potential shallowing of the nitrogen donor in diamond, challenging the conventional deep donor model.
- Identified a N-H-N complex defect predicted to be significantly shallower than isolated N donors.
- Presented a qualitative model for the formation of N-H-N defects.
Conclusions:
- The N-H-N complex defect offers a plausible explanation for shallower donor behavior in nitrogen-rich diamond.
- Recent experimental observations of muonium centers in N-rich diamond support the existence of such complexes.