Journal
VACUUM
Volume 125, Issue -, Pages 106-112Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2015.12.009
Keywords
Thin films; Low energy electron diffraction; Photoemission spectroscopy
Funding
- Micro-Nano initiative program of the Department of Atomic Energy (DAE), Government of India
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Growth of tin (Sn) on Ag(001) substrate has been studied at elevated temperatures using low energy electron diffraction (LEED), x-ray photoemission spectroscopy (XPS) and angle-resolved photoemission spectroscopy (ARPES) measurements. A c(2 x 2) ordered surface is observed for very low coverages (0.1 ML) of Sn which subsequently transforms into a p(2 x 2) ordered surface for 0.25 ML Sn coverage, suggesting formation of a substitutionally ordered surface alloy. For higher coverages of Sn beyond 0.5 ML, no further structural evolution was observed with a constant p(1 x 1) LEED pattern. Our XPS results indicate diffusion of Ag atoms into Sn layers and forming Ag Sn alloy film. Along with LEED and XPS, our ARPES results confirm the presence of an ordered Ag overlayer on the alloy film, suggesting a sandwich structure. Our studies are important in understanding the growth mechanism and electronic properties of Sn films on noble metal substrates. (C) 2015 Elsevier Ltd. All rights reserved.
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