Abstract
Copper overlayers deposited on nearly stoichiometric SrTiO3(001) have been investigated with scanning tunneling microscopy (STM). Vapor deposition of Cu on a SrTiO3(001) surface at ambient temperature leads to the formation of three dimensional islands (clusters). The distribution of Cu islands appears to be inhomogeneous with two characteristic morphologies. In regions with a low density of Cu islands the Cu was always associated with step edges or defect sites. In regions with a high density of Cu islands the islands exhibit a random but nearly close packed morphology. The variation of Cu island density is indicative of diffusion of Cu clusters on the SrTiO3(001) surface. Diffusion was further confirmed by annealing the Cu/SrTiO3 at elevated temperatures yielding agglomeration of Cu clusters.
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Liang, Y., Carroll, D.L. & Bonnell, D.A. The Morphology of Cu Clusters on SrTiO3(001) at Initial Stages of Metal Film Growth. MRS Online Proceedings Library 355, 51–57 (1994). https://doi.org/10.1557/PROC-355-51
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DOI: https://doi.org/10.1557/PROC-355-51