Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/27033
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Título : Morphological evolution of InAs/InP quantum wires through aberration-corrected scanning transmission electron microscopy
Autor : Sales, D. L., Varela, M., Pennycook, S. J., Galindo, P. L., González Sotos, Luisa, González Díez, Yolanda, Fuster, David, Molina, Sergio I.
Palabras clave : Quantum wires
Thin films
Transmission electron microscopy
Fecha de publicación : 21-Jul-2010
Editor: Institute of Physics Publishing
Citación : Nanotechnology 21(32): 325706 (2010)
Resumen: Evolution of the size, shape and composition of self-assembled InAs/InP quantum wires through the Stranski–Krastanov transition has been determined by aberration-corrected Z-contrast imaging. High resolution compositional maps of the wires in the initial, intermediate and final formation stages are presented. (001) is the main facet at their very initial stage of formation, which is gradually reduced in favour of {114} or {118}, ending with the formation of mature quantum wires with {114} facets. Significant changes in wire dimensions are measured when varying slightly the amount of InAs deposited. These results are used as input parameters to build three-dimensional models that allow calculation of the strain energy during the quantum wire formation process. The observed morphological evolution is explained in terms of the calculated elastic energy changes at the growth front. Regions of the wetting layer close to the nanostructure perimeters have higher strain energy, causing migration of As atoms towards the quantum wire terraces, where the structure is partially relaxed; the thickness of the wetting layer is reduced in these zones and the island height increases until the (001) facet is removed.
Versión del editor: http://dx.doi.org/10.1088/0957-4484/21/32/325706
URI : http://hdl.handle.net/10261/27033
ISSN: 0957-4484
DOI: 10.1088/0957-4484/21/32/325706
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