Comparative study of Sr and Ba adsorption on Si(100)

The adsorption of submonolayers and monolayers of strontium and barium on S i(1 0 0) are reported using low energy electron diffraction (LEED) and Auge r electron spectroscopy (AES). The samples were prepared by deposition at r oom temperature followed by annealing at elevated temperatures, and by depo sition with the silicon held at a high temperature. The adsorbate phases we re observed using LEED and the surface coverage calibration using AES and u ltrahigh vacuum scanning tunneling microscopy (UHV-STM). Marked differences between the adsorption properties of the strontium and barium adsorbates h ave been found, shedding light on their prospective role as templates for t he growth of perovskites used as high dielectric constants for electronic d evice applications. (C) 2001 Elsevier Science B.V. All rights reserved.