Misfit Strain Relaxation Mechanisms in Core/Shell Nanowires

Abstract

In the past decade, core/shell nanowires (NWs) have attracted much attention due to the broad variety of potential applications of these structures in future nanoelectronic and nanophotonic devices. Because of the lattice mismatch between the core and shell materials, crystal dislocations often form to relax the mismatch strains. In this article, we propose a relaxation mechanism for the misfit strains generated in the core/shell NWs, in which lattice dislocations nucleate from the outer surfaces and then propagate to the core/shell interface. An analytical model is developed to predict the critical shell thickness corresponding to defect-free core/shell NWs with respect to the growth direction.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Core/shell; Defect-Free; Growth Directions; Lattice Dislocations; Misfit Strain Relaxation; Mismatch Strain; Nanophotonic Devices; Outer Surface; Potential Applications; Relaxation Mechanism; Shell Materials; Shell Thickness; Nanowires; Dislocations (Crystals)

International Standard Serial Number (ISSN)

1047-4838; 1543-1851

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2012 Minerals, Metals and Materials Society (TMS), All rights reserved.

Publication Date

01 Oct 2012

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