Atomic scale strain relaxation in axial semiconductor III-V nanowire heterostructures

de la Mata, María, Magén, César, Caroff, Philippe and Arbiol, Jordi 2014. Atomic scale strain relaxation in axial semiconductor III-V nanowire heterostructures. Nano Letters 14 (11) , pp. 6614-6620. 10.1021/nl503273j

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Abstract

Combination of mismatched materials in semiconductor nanowire heterostructures offers a freedom of bandstructure engineering that is impossible in standard planar epitaxy. Nevertheless, the presence of strain and structural defects directly control the optoelectronic properties of these nanomaterials. Understanding with atomic accuracy how mismatched heterostructures release or accommodate strain, therefore, is highly desirable. By using atomic resolution high angle annular dark field scanning transmission electron microscopy combined with geometrical phase analyses and computer simulations, we are able to establish the relaxation mechanisms (including both elastic and plastic deformations) to release the mismatch strain in axial nanowire heterostructures. Formation of misfit dislocations, diffusion of atomic species, polarity transfer, and induced structural transformations are studied with atomic resolution at the intermediate ternary interfaces. Two nanowire heterostructure systems with promising applications (InAs/InSb and GaAs/GaSb) have been selected as key examples.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	American Chemical Society
ISSN:	1530-6984
Date of First Compliant Deposit:	16 August 2017
Date of Acceptance:	17 October 2014
Last Modified:	03 May 2023 21:34
URI:	https://orca.cardiff.ac.uk/id/eprint/101617

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