Abstract
Growth of the first monolayer (ML) of Ag on the Si(001) surface at room temperature has been studied by means of scanning tunneling microscopy (STM) and low-energy electron diffraction. Ag atoms form single-layer islands with a density of one Ag atom per Si surface atom. These Ag islands exhibit both local 2\ifmmode\times\else\texttimes\fi{}1 and 2\ifmmode\times\else\texttimes\fi{}2 order. As the Ag coverage approaches 1 ML, the 2\ifmmode\times\else\texttimes\fi{}1 order disappears in favor of the 2\ifmmode\times\else\texttimes\fi{}2 order. One ML of Ag is required to complete the first full surface layer. There is no evidence of three-dimensional Ag growth up to 1 ML. Models of the 2\ifmmode\times\else\texttimes\fi{}1 and 2\ifmmode\times\else\texttimes\fi{}2 surface structures are proposed on the basis of the STM images.
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