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Chemical Tension in VLS Nanostructure Growth Process: From Nanohillocks to Nanowires

Published online by Cambridge University Press:  01 February 2011

Na Li ,
Teh Y. Tan  and
Ulrich Gösele
Na Li
Affiliation:
[email protected], Duke University, Mechanical Engineering and Materials Science, Durham, NC, 27708, United States
Teh Y. Tan
Affiliation:
[email protected], Duke University, Mechanical Engineering and Materials Science, Duke University, Durham, NC, 27708, United States
Ulrich Gösele
Affiliation:
[email protected], Max-Plank-Institute of Microstructure Physics, Halle, D-06120, Germany
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Abstract

ABSTRACT

We formulate a global equilibrium model to describe the growth of 1-d nanostructures in the VLS process by including also the chemical tension in addition to the physical tensions. The chemical tension derives from the Gibbs free energy release due to the growth of a crystal layer. The system global equilibrium is attained via the balance of the static physical tensions and the dynamic chemical tension, which allows the system to reach the minimum Gibbs free energy state. The model predicts, and provides conditions for the growth of nanowires of all sizes exceeding a lower thermodynamic limit. The model also predicts the conditions distinguishing the growth of nanaohillocks from nanowires.

Keywords

nanostructuremorphologycrystal growth
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1017 , 2007 , 1017-DD04-09
Copyright
Copyright © Materials Research Society 2007

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References

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