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Título: | Sub-nanometer mapping of strain-induced band structure variations in planar nanowire core-shell heterostructures |
Autor: | Martí-Sànchez, Sara CSIC ORCID; Botifoll, Marc CSIC ORCID; Oksenberg, Eitan; Koch, Christian CSIC; Borja, Carla; Spadaro, Maria Chiara CSIC ORCID; Giulio, Valerio di; Ramasse, Quentin M.; García de Abajo, F. Javier; Joselevich, Ernesto; Arbiol, Jordi CSIC ORCID CVN | Fecha de publicación: | 2022 | Editor: | Springer Nature | Citación: | Nature Communications 13: 4089 (2022) | Resumen: | Strain relaxation mechanisms during epitaxial growth of core-shell nanostructures play a key role in determining their morphologies, crystal structure and properties. To unveil those mechanisms, we perform atomic-scale aberration-corrected scanning transmission electron microscopy studies on planar core-shell ZnSe@ZnTe nanowires on α-Al2O3 substrates. The core morphology affects the shell structure involving plane bending and the formation of low-angle polar boundaries. The origin of this phenomenon and its consequences on the electronic band structure are discussed. We further use monochromated valence electron energy-loss spectroscopy to obtain spatially resolved band-gap maps of the heterostructure with sub-nanometer spatial resolution. A decrease in band-gap energy at highly strained core-shell interfacial regions is found, along with a switch from direct to indirect band-gap. These findings represent an advance in the sub-nanometer-scale understanding of the interplay between structure and electronic properties associated with highly mismatched semiconductor heterostructures, especially with those related to the planar growth of heterostructured nanowire networks. | Versión del editor: | https://doi.org/10.1038/s41467-022-31778-3 | URI: | http://hdl.handle.net/10261/287654 | DOI: | 10.1038/s41467-022-31778-3 | E-ISSN: | 2041-1723 |
Aparece en las colecciones: | (CIN2) Artículos |
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subnanohetero.pdf | 3,28 MB | Adobe PDF | Visualizar/Abrir |
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