The role of nitrogen-nitrogen pairs in the deviation of the GaAsN lattice parameter from Vegard’s law
We propose several physical mechanisms that may account for the difference between the nitrogen composition in GaAsN materials measured by secondary ion mass spectroscopy and x-ray diffraction. A simplified model proposed here proves that Vegard’s law remains valid as long as all nitrogen atoms i...
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| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2013
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/100834 http://hdl.handle.net/10220/17960 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | We propose several physical mechanisms that may account for the difference between the nitrogen
composition in GaAsN materials measured by secondary ion mass spectroscopy and x-ray
diffraction. A simplified model proposed here proves that Vegard’s law remains valid as long
as all nitrogen atoms in the GaAsN alloys are located substitutionally at the arsenic sites. The
theoretical results based on N-N pair defects are in good agreement with the experimental data,
suggesting that the N-N pairs are the predominant nitrogen-related defects that cause deviation
from the GaAsN lattice constant predicted by Vegard’s law. |
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