Apparent activation energy during surface evolution by step formation and flow

M.A. Gosálvez, D. Cheng, Risto Nieminen, K. Sato

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

18 Sitaatiot (Scopus)
83 Lataukset (Pure)


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.

JulkaisuNew Journal of Physics
DOI - pysyväislinkit
TilaJulkaistu - 9 marraskuuta 2006
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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