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

Author:

Martí-Sánchez Sara,Botifoll Marc,Oksenberg EitanORCID,Koch Christian,Borja Carla,Spadaro Maria ChiaraORCID,Di Giulio ValerioORCID,Ramasse QuentinORCID,García de Abajo F. Javier,Joselevich ErnestoORCID,Arbiol JordiORCID

Abstract

AbstractStrain 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.

Funder

Fundación General CSIC

Generalitat de Catalunya

Blond McIndoe Research Foundation

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry,Multidisciplinary

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