Morphology and spatial distribution of ordered domains in GaInP/GaAs(001) according to transmission electron microscopy

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Resumo

The structure of epitaxial films of the GaInP solid solution, in which ordering occurs, was studied using transmission electron microscopy. The films were grown by metalorganic vapor phase epitaxy on GaAs (001) substrates near the half-composition point. During the study, dark-field images obtained using superstructure reflections for cross-sectional and plan-view specimens of films were analyzed. The morphology and relative spatial arrangement of ordered domains have been determined. The phenomenon of spontaneous self-organization of regions with CuPt–B+ and CuPt–B– ordering near the surface was discovered, while in the bulk of the film the domains are uniformly located and mutually overlap each other. The effect of spatial separation of domains is associated with the lattice relaxation, leading to a change in the surface topology.

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Sobre autores

А. Myasoedov

Ioffe Institute RAS

Autor responsável pela correspondência
Email: amyasoedov88@gmail.com
Rússia, St. Petersburg

N. Bert

Ioffe Institute RAS

Email: amyasoedov88@gmail.com
Rússia, St. Petersburg

N. Kalyuzhnyy

Ioffe Institute RAS

Email: amyasoedov88@gmail.com
Rússia, St. Petersburg

A. Mintairov

Ioffe Institute RAS

Email: amyasoedov88@gmail.com
Rússia, St. Petersburg

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2. Fig. 1. Schematic representation of the ordering: a – CuPt–B–, b – CuPt–B+. Images were obtained using the VESTA software package.

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3. Fig. 2. Dark-field TEM images of the same region for reflections: a – b – Arrows indicate regions characterized by only one ordering variant. Electron microdiffraction pattern corresponding to this region (c).

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4. Fig. 3. TEM image of the projection of the interface between the GaInP film and the substrate. To obtain the image, the sample was strongly tilted. MD – misfit dislocation lines oriented along the [110] direction.

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5. Fig. 4. Dark-field TEM images for superstructure reflections (a), (b), (c), (d), (d) for the ordering of CuPt–B+ (a, c, d) and CuPt–B– (b, d). The corresponding electron diffraction pattern for the zone axis [116] (e).

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