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Butcher, K. S. A, Timmers, H, Afifuddin,, Chen, Patrick P.-T, Weijers, T. D. M, Goldys, E. M, Tansley, T. L, Elliman, R. G, Freitas, J. A, . American Institute of Physics; 2002. Crystal size and oxygen segregation for polycrystalline GaN.
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/16153
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- Title
- Crystal size and oxygen segregation for polycrystalline GaN
- Related
- Journal of applied physics, Vol. 92, Issue 6, p.3397-3403
- DOI
- http://dx.doi.org/10.1063/1.1499232
- Publisher
- American Institute of Physics
- Date
- 2002
- Author/Creator
- Butcher, K. S. A
- Author/Creator
- Timmers, H
- Author/Creator
- Afifuddin,
- Author/Creator
- Chen, Patrick P.-T
- Author/Creator
- Weijers, T. D. M
- Author/Creator
- Goldys, E. M
- Author/Creator
- Tansley, T. L
- Author/Creator
- Elliman, R. G
- Author/Creator
- Freitas, J. A
- Description
- The grain size for polycrystalline GaN, grown in low-temperature gallium-rich conditions, is shown to be correlated to the oxygen content of the films. Films with lower oxygen content were observed to have larger crystals with an increased tendency to a single-preferred crystal orientation. Elastic recoil detection analysis with heavy ions (i.e., 200 MeV [sup 197] Au ions) was used to determine the composition of the GaN films grown for the study, including the hydrogen, carbon, gallium, nitrogen, and oxygen content. Atomic force microscopy and x-ray diffraction were used to study the sample morphology. From these measurements, the available surface area of the films was found to be sufficient for a significant proportion of the oxygen present in the films to segregate at the grain boundaries. This interpretation is consistent with earlier theoretical studies of the formation and segregation of the V[sub Ga]-(O[sub N])[sub 3] defect complex at dislocation sites in gallium-rich GaN. For this work, however, the defect complex is believed to segregate at the grain boundary of the polycrystalline GaN.
- Description
- 7 page(s)
- Resource Type
- journal article
- Organisation
- Macquarie University. Dept. of Physics
- Identifier
- http://hdl.handle.net/1959.14/16153
- Identifier
- ISSN:0021-8979
- Identifier
- mq-rm-2002014528
- Language
- eng
- Peer Reviewed
