Synchrotron photoemission studies of the Sb-passivated Si surfaces: Degenerate doping and bulk band dispersions

Journal Article · Thu Dec 14 23:00:00 EST 1989 · Physical Review (Section) B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.40.11804· OSTI ID:7268500

Rich, D H; Franklin, G E; Leibsle, F M; Miller, T; Chiang, T ^[1]

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1. Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801 (US) Materials Research Laboratory, University of Illinois at Urbana-Champaign, 104 South Goodwin Avenue, Urbana, Illinois 61801

Synchrotron photoemission of the Sb-covered Si(001), Si(111), and Si(110) surfaces revealed that the Fermi-level position crosses the conduction-band minimum (CBM) of Si for Sb coverages approaching a one-monolayer saturation limit. Momentum-resolved photoemission of the Sb-saturated Si(001) and Si(110) surfaces showed the existence of an occupied initial state located near the CBM. The photoemission intensity of the state has been examined as a function of photon energy with constant initial-state difference spectroscopy which showed various resonances occurring due to transitions to different final states from the CBM. The metallic character of the surface is shown to be due to degenerate doping in the near-surface region. Core-level spectroscopy of Sb/Si(111) and Sb/Si(001) revealed that the Si atoms in the near-surface region are converted to exhibit a bulklike arrangement after Sb coverage. The Sb saturation of Si(111) and Si(001) was found to allow the measurement of the bulk band-dispersion relations along the high-symmetry {Gamma}-{Lambda}-{ital L} and {Gamma}-{Delta}-{ital X} directions over a wide photon-energy range (37--153 eV). Strain-reduction mechanisms in the near-surface region are discussed. The measured CBM-state resonances and the Si(001) bulk band transitions indicate that the effective mass of the free-electron-like final band changes for varying photon energies.

• DOE Contract Number: AC02-76ER01198
• OSTI ID: 7268500
• Journal Information: Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 40:17; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ANTIMONY
BREMSSTRAHLUNG
COATINGS
DISPERSION RELATIONS
EFFECTIVE MASS
ELECTROMAGNETIC RADIATION
ELECTRONIC STRUCTURE
ELEMENTS
EMISSION
ENERGY LEVELS
FERMI LEVEL
MASS
METALS
PASSIVATION
PHOTOEMISSION
RADIATIONS
SECONDARY EMISSION
SEMIMETALS
SILICON
SURFACE PROPERTIES
SYNCHROTRON RADIATION