by José Emilio Prieto and Ivan Markov
Abstract:
We have studied the effect of the misfit on the equilibrium shape of three-dimensional pyramidal islands grown on a foreign substrate in the case of incomplete wetting (Volmer-Weber mode of growth). By means of atomistic simulations using anharmonic interaction potentials, we find that tensile islands have smaller aspect ratios compared with compressed islands owing to their better adhesion to the substrate. The average strains of consecutive layers decrease faster with thickness in compressed than in tensile islands. The strains decrease rapidly with thickness, with the consequence that above a certain height, the upper layers of the pyramid become practically unstrained and do not contribute to a further reduction in the top base. As a result, the truncated pyramids are not expected to transform into full pyramids. Our results are in good agreement with experimental observations in different systems.
Reference:
José Emilio Prieto and Ivan Markov, “Effect of the lattice misfit on the equilibrium shape of strained islands in Volmer-Weber growth”, Physical Review B, vol. 82, no. 16, pp. 165423.
Bibtex Entry:
@article{prieto_effect_2010,
title = {Effect of the lattice misfit on the equilibrium shape of strained islands in {Volmer}-{Weber} growth},
volume = {82},
url = {https://link.aps.org/doi/10.1103/PhysRevB.82.165423},
doi = {10.1103/PhysRevB.82.165423},
abstract = {We have studied the effect of the misfit on the equilibrium shape of three-dimensional pyramidal islands grown on a foreign substrate in the case of incomplete wetting (Volmer-Weber mode of growth). By means of atomistic simulations using anharmonic interaction potentials, we find that tensile islands have smaller aspect ratios compared with compressed islands owing to their better adhesion to the substrate. The average strains of consecutive layers decrease faster with thickness in compressed than in tensile islands. The strains decrease rapidly with thickness, with the consequence that above a certain height, the upper layers of the pyramid become practically unstrained and do not contribute to a further reduction in the top base. As a result, the truncated pyramids are not expected to transform into full pyramids. Our results are in good agreement with experimental observations in different systems.},
number = {16},
urldate = {2017-08-01},
journal = {Physical Review B},
author = {Prieto, José Emilio and Markov, Ivan},
month = oct,
year = {2010},
pages = {165423},
file = {APS Snapshot:E:\cmam_papers\files\709\PhysRevB.82.html:text/html;APS Snapshot:E:\Usuarios\Administrator\Zotero\storage\ZXTC8DMJ\PhysRevB.82.html:text/html},
}