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Open Access Nano Express

Beneficial defects: exploiting the intrinsic polishing-induced wafer roughness for the catalyst-free growth of Ge in-plane nanowires

Luca Persichetti1*, Anna Sgarlata2, Stefano Mori23, Marco Notarianni4, Valeria Cherubini2, Massimo Fanfoni2, Nunzio Motta4 and Adalberto Balzarotti2

Author Affiliations

1 Department of Materials, ETH Zurich, Hönggerbergring 64, Zürich 8093, Switzerland

2 Dipartimento di Fisica, Università di Roma ‘Tor Vergata’, Via della Ricerca Scientifica 1, Rome 0133, Italy

3 Dipartimento di Ingegneria dell’Impresa, ‘Mario Lucertini’, via del Politecnico 1, Rome 00133, Italy

4 Institute for Future Environments and School of Chemistry, Physics, and Mechanical Engineering, Queensland University of Technology, Brisbane QLD 4001, Australia

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Nanoscale Research Letters 2014, 9:358  doi:10.1186/1556-276X-9-358

Published: 16 July 2014

Abstract

We outline a metal-free fabrication route of in-plane Ge nanowires on Ge(001) substrates. By positively exploiting the polishing-induced defects of standard-quality commercial Ge(001) wafers, micrometer-length wires are grown by physical vapor deposition in ultra-high-vacuum environment. The shape of the wires can be tailored by the epitaxial strain induced by subsequent Si deposition, determining a progressive transformation of the wires in SiGe faceted quantum dots. This shape transition is described by finite element simulations of continuous elasticity and gives hints on the equilibrium shape of nanocrystals in the presence of tensile epitaxial strain.

PACS

81.07.Gf; 68.35.bg; 68.35.bj; 62.23.Eg

Keywords:
Nanowires; Epitaxy; Silicon; Germanium; Quantum dots