High-quality thin films of -FeSi2 have been obtained by annealing at 600°C Fe layers of thicknesses 50 100 deposited in ultrahigh vacuum on clean Si(111) substrates. The semiconducting nature of the orthorhombic phase has been checked by monitoring the empty states above EF with bremsstrahlung isochromat spectroscopy and the occupied states with x-ray-photoemission and Auger-electron spectroscopies. We have found that the -FeSi2 phase is semiconducting with a gap of about 1.0 0.2 eV. Recent local-density- approximation calculations yielded two different values for the energy gap, i.e., 0.44 and 0.8 eV. Both calculations reproduce fairly well the experimental energy position of the valence states but only qualitatively that of the unoccupied states. The Fe/Si interface formation at room temperature has also been investigated. At very low coverages (=12) Fe and Si interdiffuse to form the -FeSi2-like phase at the interface, while for increasing coverages (3) the interfacial region is buried by the growth of a metallic Fe film in the form of clusters or discontinuous islands. © 1990 The American Physical Society.

De Crescenzi, M., Gaggiotti, G., Motta, N., Patella, F., Balzarotti, A., Derrien, J. (1990). Bremsstrahlung-isochromat-spectroscopy and x-ray-photoelectron-spectroscopy investigation of the electronic structure of -FeSi2 and the Fe/Si(111) interface. PHYSICAL REVIEW. B, CONDENSED MATTER, 42(9), 5871-5874 [10.1103/PhysRevB.42.5871].

Bremsstrahlung-isochromat-spectroscopy and x-ray-photoelectron-spectroscopy investigation of the electronic structure of -FeSi2 and the Fe/Si(111) interface

PATELLA, FULVIA;
1990-01-01

Abstract

High-quality thin films of -FeSi2 have been obtained by annealing at 600°C Fe layers of thicknesses 50 100 deposited in ultrahigh vacuum on clean Si(111) substrates. The semiconducting nature of the orthorhombic phase has been checked by monitoring the empty states above EF with bremsstrahlung isochromat spectroscopy and the occupied states with x-ray-photoemission and Auger-electron spectroscopies. We have found that the -FeSi2 phase is semiconducting with a gap of about 1.0 0.2 eV. Recent local-density- approximation calculations yielded two different values for the energy gap, i.e., 0.44 and 0.8 eV. Both calculations reproduce fairly well the experimental energy position of the valence states but only qualitatively that of the unoccupied states. The Fe/Si interface formation at room temperature has also been investigated. At very low coverages (=12) Fe and Si interdiffuse to form the -FeSi2-like phase at the interface, while for increasing coverages (3) the interfacial region is buried by the growth of a metallic Fe film in the form of clusters or discontinuous islands. © 1990 The American Physical Society.
1990
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/03 - FISICA DELLA MATERIA
English
Con Impact Factor ISI
De Crescenzi, M., Gaggiotti, G., Motta, N., Patella, F., Balzarotti, A., Derrien, J. (1990). Bremsstrahlung-isochromat-spectroscopy and x-ray-photoelectron-spectroscopy investigation of the electronic structure of -FeSi2 and the Fe/Si(111) interface. PHYSICAL REVIEW. B, CONDENSED MATTER, 42(9), 5871-5874 [10.1103/PhysRevB.42.5871].
De Crescenzi, M; Gaggiotti, G; Motta, N; Patella, F; Balzarotti, A; Derrien, J
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/45361
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