Apparent activation energy during surface evolution by step formation and flow

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2006
Major/Subject
Mcode
Degree programme
Language
en
Pages
269/1-11
Series
New Journal of Physics, Volume 8, Issue 11
Abstract
During growth and etching by step flow as examples of anisotropic surface processing the apparent activation energy of the growth/etch rate depends on orientation, increasing gradually as a principal, terrace-rich surface is approached. This behaviour is traditionally explained as a change in the dominating process from step propagation to island/pit nucleation. We show that the orientation dependence of the activation energy is actually the result of a traditionally disregarded temperature dependence in the number of active step sites and is not attributable to an increasing role of step nucleation nor to a purely geometrical decrease in the number of step sites. This modifies the traditional picture of the apparent energy for a principal surface and explains how the energy can be higher than, equal to or even lower than that for vicinal orientations.
Description
Keywords
anisotropic surfaces, activation energy
Other note
Citation
Gosálvez, M. A. & Cheng, D. & Nieminen, Risto M. & Sato, K. 2006. Apparent activation energy during surface evolution by step formation and flow. New Journal of Physics. Volume 8, Issue 11. 269/1-11. ISSN 1367-2630 (printed). DOI: 10.1088/1367-2630/8/11/269.