2013
DOI: 10.1063/1.4812277
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Local structure of amorphous GaN1−xAsx semiconductor alloys across the composition range

Abstract: Typically only dilute (up to ∼10%) highly mismatched alloys can be grown due to the large differences in atomic size and electronegativity of the host and the alloying elements. We have overcome the miscibility gap of the GaN1−xAsx system using low temperature molecular beam epitaxy. In the intermediate composition range (0.10 < x < 0.75), the resulting alloys are amorphous. To gain a better understanding of the amorphous structure, the local environment of the As and Ga atoms was investigated us… Show more

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Cited by 6 publications
(2 citation statements)
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“…For the films grown on Pyrex substrates, the composition range for amorphous alloys extends to x~0.1 [77]. The amorphous nature of these films were further confirmed by extended X-ray absorption fine structure measurements [78].…”
Section: Lt-mbe Grown Gan1-xasx Over the Entire Composition Rangementioning
confidence: 67%
“…For the films grown on Pyrex substrates, the composition range for amorphous alloys extends to x~0.1 [77]. The amorphous nature of these films were further confirmed by extended X-ray absorption fine structure measurements [78].…”
Section: Lt-mbe Grown Gan1-xasx Over the Entire Composition Rangementioning
confidence: 67%
“…Extended X-ray absorption fine structure (EXAFS) analysis is ideally suited for this purpose, allowing for determination of local environment around the X-ray absorbing atoms. By analyzing oscillations in the normalized X-ray absorption data, , critical information can be extracted, such as local coordination number ( N ), interatomic distance to neighboring atoms ( r ), and the Debye–Waller disorder parameter (σ 2 ). Despite their adjacent atomic numbers, the K edge energies of Nb and Mo are widely separated by ∼1 keV (Nb = 18.99 keV and Mo = 20.01 keV), and this provides sufficient energy span to fully resolve their EXAFS oscillations in the postabsorption spectral region.…”
Section: Resultsmentioning
confidence: 99%