Photoelectron Spectroscopic Study of the Interaction of Thin Fe Films with the MoS2(0001) Surface.
Abstract
The Iron/Molybdenum Disulfide interface has been studied by high-resolution photoelectron spectroscopy using synchrotron radiation. The evolution of the MO 3d, Fe 3p, and S 2p core levels and of the valence band spectra (hv =152 eV) during growth of vapor-deposited Fe films (1-10) indicates the production of sulfur vacancy defects in the MoS2 (0001) surface. Several submonolayer sulfur surface species were formed, including sulfur adsorbed on the Fe surfaces and a reacted Fe-S species. The MoS2 surface was found to be covered for Fe film thicknesses of approx. 10A. Annealing a 10 film to 600 K resulted in the Fe film beginning to agglomerate, while annealing to 700 to 900 K resulted in further agglomeration of the Fe film. Annealing to 700 to 900 K also resulted in reformation of a partially disordered MoS2 (0001)-1 x 1 surface with approx. 5% defects, as determined from photoelectron spectroscopy and low-energy electron diffraction. The overlayer film remained primarily in the form of metallic Fe, before and after annealing to temperatures < or =900 K, which was shown by the behavior of the Fe3p core level spectra and valence band spectra. Annealing the sample to 1200 K resulted in decomposition of the MoS2 (0001) surface. The results indicate that the Fe/MoS2 (0001) system exhibits some interfacial reactivity but does not form bulk Fe-S compounds. The results have been compared to those of previous studies of the Fe/MoS2(0001) system. (AW)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1989
- Accession Number
- ADA214348
Entities
People
- J. R. Lince
- M. M. Hills
- P. D. Fleischauer
- T. B. Steward
Organizations
- The Aerospace Corporation