Catalyst-dependent morphological evolution by interfacial stress in crystalline-amorphous core-shell germanium nanowires

Palavalli, N.D. and Yaghoubi, A. and Lai, C.C. and Tin, C.C. and Javey, A. and Chueh, Y.L. (2015) Catalyst-dependent morphological evolution by interfacial stress in crystalline-amorphous core-shell germanium nanowires. RSC Advances, 5 (36). pp. 28454-28459. ISSN 2046-2069

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Abstract

Directing the morphological evolution of one-dimensional materials in order to tune their properties for a variety of practical applications in optical sensing and solar cells is an ongoing effort. Here, we establish a systematic method for exerting control over the morphology of nanowires (NWs) grown via a vapour-solid-solid (VSS) process from different metal catalysts. We use germanium, a technologically important material, to demonstrate how catalysts influence the axial growth rate of a crystalline core against the lateral vapour deposition of an amorphous shell which in turn deforms the NWs into straight, tapered or spiral geometries due to interfacial stress. Finite element method (FEM) and molecular dynamic (MD) simulations are further utilized to confirm the proposed mechanism of deformation in crystalline-amorphous core-shell NWs.

Item Type: Article
Additional Information: Ce5jy Times Cited:0 Cited References Count:41
Uncontrolled Keywords: Nonuniform film stresses, semiconductor nanowires, system curvatures, silicon nanowires, misfit strain, solar-cells, growth, heterostructures, chemistry, formula,
Subjects: T Technology > T Technology (General)
T Technology > TJ Mechanical engineering and machinery
Depositing User: Mr Jenal S
Date Deposited: 22 Jul 2015 01:16
Last Modified: 06 Oct 2017 03:50
URI: http://eprints.um.edu.my/id/eprint/13739

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