Electronic structure of nickel silicides Ni/sub 2/Si, NiSi, and NiSi/sub 2/

Journal Article · Thu Jul 15 04:00:00 EDT 1982 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.26.546· OSTI ID:7044830

Franciosi, A; Weaver, J H; Schmidt, F A

Synchrotron-radiation photoemission studies of bulk samples of Ni/sub 2/Si, NiSi, and NiSi/sub 2/ show valence-band emission dominated by Ni 3d-derived features. These d bands shift toward E/sub F/ and broaden with increasing Ni concentration and Ni-Ni interaction, falling at -3.2 eV for NiSi/sub 2/ and -1.3 eV for Ni/sub 2/Si. In each case, the density of states near E/sub F/ is very low. These results are interpreted in terms of recent calculations which are shown to forecast correctly the general trends and modifications of the silicide electronic structure. Further, they indicate that the d-band features observed in photoemission reflect d states which are not directly involved in the Ni--Si bonds. Core-level studies show that charge transfer plays a minor role in the chemical bond, but changes in the electronic configuration account for the observed shifts in the Ni 3p binding energy.

• Research Organization: Synchrotron Radiation Center, University of Wisconsin-Madison, Stoughton, Wisconsin 53589
• OSTI ID: 7044830
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 26:2; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
BREMSSTRAHLUNG
CHARGE EXCHANGE
CHEMICAL BONDS
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
ENERGY LEVELS
ENERGY-LEVEL DENSITY
FERMI LEVEL
LCAO METHOD
NICKEL COMPOUNDS
NICKEL SILICIDES
PHOTOELECTRON SPECTROSCOPY
RADIATIONS
SILICIDES
SILICON COMPOUNDS
SPECTROSCOPY
SYNCHROTRON RADIATION
TRANSITION ELEMENT COMPOUNDS
ULTRAHIGH VACUUM