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Self-diffusion in 69Ga121Sb/71Ga123Sb isotope heterostructures

AuthorsBracht, H.; Nicols, S. P.; Haller, E. E.; Silveira, Juan Pedro ; Briones Fernández-Pola, Fernando
KeywordsSecondary ion mass spectra
Isotope effects
Semiconductor heterojunctions
Gallium compounds
III-V semiconductors
Vacancies (crystal)
Chemical interdiffusion
Issue Date15-May-2001
PublisherAmerican Institute of Physics
CitationJournal of Applied Physics 89, 5393 (2001)
AbstractGallium and antimony self-diffusion experiments have been performed in undoped 69Ga121Sb/71Ga123Sb isotope heterostructures at temperatures between 571 and 708 °C under Sb- and Ga-rich ambients. Ga and Sb profiles measured with secondary ion mass spectrometry reveal that Ga diffuses faster than Sb by several orders of magnitude. This strongly suggests that the two self-atom species diffuse independently on their own sublattices. Experimental results lead us to conclude that Ga and Sb diffusion are mediated by Ga vacancies and Sb interstitials, respectively, and not by the formation of a triple defect proposed earlier by Weiler and Mehrer [Philos. Mag. A 49, 309 (1984)]. The extremely slow diffusion of Sb up to the melting temperature of GaSb is proposed to be a consequence of amphoteric transformations between native point defects which suppress the formation of those native defects which control Sb diffusion. Preliminary experiments exploring the effect of Zn indiffusion at 550 °C on Ga and Sb diffusion reveal an enhanced intermixing of the Ga isotope layers compared to undoped GaSb. However, under the same conditions the diffusion of Sb was not significantly affected.
Publisher version (URL)http://dx.doi.org/10.1063/1.1363683
Appears in Collections:(IMN-CNM) Artículos
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