Surface infrared studies of silicon/silicon oxide interfaces derived from hydridosilsesquioxane clusters

J. N. Greeley, L. M. Meeuwenberg, M. M Banaszak Holl

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Hydridosilsesquioxane-based model systems have been developed over the past five years to help elucidate the structure and reactivity properties of silicon/silicon oxide interfaces. In this paper, the assignment of infrared bands as Si-O or Si-H derived is explored via deuterium labeling studies. In particular, the issue of the presence of adventitious water in the model interfaces is directly addressed via the chemisorption of deuterated- spherosiloxane clusters (D8Si8O12) onto clean Si(100). The experiments definitively demonstrate that there are no water-derived features detectable by RAIRS in the model interfaces. This rules out water contamination as a possible explanation for the 1.0 eV shifted feature observed in Si 2p core- level spectroscopy for the model systems. This work is further supported by cluster and water co-dosing experiments on Si(100), which address the spectroscopic sensitivity of surface silicon-hydrides in this system. Finally, the first surface crystallographic studies of the model interfaces performed with LEED are presented. The chemisorbed hydridosilsesquioxane model systems are shown to retain the 2 x 1 reconstruction of the original Si(100) surface.

Original languageEnglish
Pages (from-to)7776-7782
Number of pages7
JournalJournal of the American Chemical Society
Issue number31
Publication statusPublished - 12 Aug 1998
Externally publishedYes

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