Sub-nanometer mapping of strain-induced band structure variations in planar nanowire core-shell heterostructures.

ABSTRACT: 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 energ

SUBMITTER: Marti-Sanchez S 

PROVIDER: S-EPMC9283334 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature