Electronic and vibrational properties of ultrathin SiO2 films grown on Mo(112)

S. Wendt, E. Ozensoy, T. Wei, M. Frerichs, Y. Cai, M. S. Chen, and D. W. Goodman
Phys. Rev. B 72, 115409 – Published 7 September 2005

Abstract

Ultrathin SiO2 films on Mo(112) were synthesized using different preparation procedures and characterized with ultraviolet photoelectron spectroscopy (UPS), metastable impact electron spectroscopy (MIES), and polarization modulation infrared reflection absorption spectroscopy (PM-IRAS). By correlating the vibrational and electronic data, an assignment of the prominent spectral features are made. The physical properties of SiO2 films near one monolayer are influenced by the Mo substrate due to the SiOMo linkages, whereas films greater than two monolayers show properties comparable to bulklike silica samples. The electronic and vibrational properties of the SiO2 thin films are strongly coverage dependent. The data show that highly ordered SiO2 films can be grown up to one monolayer, whereas films with a thickness of greater than one monolayer are amorphous.

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  • Received 2 November 2004

DOI:https://doi.org/10.1103/PhysRevB.72.115409

©2005 American Physical Society

Authors & Affiliations

S. Wendt, E. Ozensoy, T. Wei, M. Frerichs, Y. Cai, M. S. Chen, and D. W. Goodman*

  • Department of Chemistry, Texas A & M University, College Station, Texas 77842-3012, USA

  • *Author to whom correspondence should be addressed. Electronic address: goodman@mail.chem.tamu.edu

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Vol. 72, Iss. 11 — 15 September 2005

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