Modeling thermal decay of high-aspect-ratio nanostructures

Castez, Marcos F.; Salvarezza, Roberto C.
February 2009
Applied Physics Letters;2/2/2009, Vol. 94 Issue 5, pN.PAG
Academic Journal
A multiapproach modeling of surface diffusion driven decay of three dimensional high-aspect-ratio nanostructures is presented. Three different strategies are used: a continuous model, kinetic Monte Carlo simulations, and a molecular dynamics approach using an embedded atom model potential. All these models predict that an initially single-valued surface evolves into an intermediate multivalued state, in which features on the surface develop into a nonconvex shape. Moreover, such nanofeatures in the case of discrete models are quite well described in terms of the continuous modeling. Quantitative bounds for the aspect-ratios in which emergence of overhangs starts are estimated.


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