CoSi2(111), FeSi2(001), and MoSi2(001) surfaces and interfaces with Ti

T. Komeda, Toshiyuki Hirano, G. D. Waddill, Steven G. Anderson, J. P. Sullivan, J. H. Weaver

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

High-resolution core-level and valence-band photoemission studies of cleaved CoSi2(111), FeSi2(001), and MoSi2(001) show that a Si monolayer terminates the exposed surface. Comparison with results for CoSi2(111) surfaces prepared by annealing reveals significant differences in surface morphology and Si 2p binding energies. Titanium-atom deposition onto the cleaved surfaces leads to the disruption of the Si monolayer and the appearance of two Ti-induced features that correspond to TiSi-like bonding configurations and Si atoms in solution in the Ti overlayer. Quantitative differences in the distribution of Si in solution for Ti/MoSi2(001) compared to Ti/CoSi2(111) and Ti/FeSi2(001) are related to substrate silicide stability. Analysis of the Ti 3p core-level evolution shows equivalent changes for Ti/CoSi2(111) and Ti/MoSi2(001), supporting the conclusion that TiSi-like bonding is produced at low Ti coverage. Valence-band spectra show the convergence to Ti metal at high coverage. Analysis of the Si 2p emission for (18 Ti)/CoSi2(111) annealed to 200°C shows increased amounts of TiSi as silicide growth is kinetically enhanced.

Original languageEnglish
Pages (from-to)8345-8352
Number of pages8
JournalPhysical Review B
Volume41
Issue number12
DOIs
Publication statusPublished - 1990 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Komeda, T., Hirano, T., Waddill, G. D., Anderson, S. G., Sullivan, J. P., & Weaver, J. H. (1990). CoSi2(111), FeSi2(001), and MoSi2(001) surfaces and interfaces with Ti. Physical Review B, 41(12), 8345-8352. https://doi.org/10.1103/PhysRevB.41.8345