X-ray absorption study of the growth of Y2O3 on Si(001) (Articolo in rivista)

Type
Label
  • X-ray absorption study of the growth of Y2O3 on Si(001) (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.71.075318 (literal)
Alternative label
  • M. Malvestuto, R. Carboni, and F. Boscherini*, F. D'Acapito, S. Spiga and M. Fanciulli, A. Dimoulas, G. Vellianitis, and G. Mavrou (2005)
    X-ray absorption study of the growth of Y2O3 on Si(001)
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • M. Malvestuto, R. Carboni, and F. Boscherini*, F. D'Acapito, S. Spiga and M. Fanciulli, A. Dimoulas, G. Vellianitis, and G. Mavrou (literal)
Pagina inizio
  • 075318 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 71 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Department of Physics and Istituto Nazionale per la Fisica della Materia (INFM), University of Bologna, Viale C. Berti Pichat 6/2, I-40127 Bologna, Italy Istituto Nazionale per la Fisica della Materia (INFM)-OGG, ESRF, GILDA CRG, BP 220, F-38043 Grenoble, France Laboratorio MDM-INFM, I-20041 Agrate Brianza, Italy MBE Laboratory, Institute of Material Science, Demokritos National Center for Scientific Research, Athens, Greece (literal)
Titolo
  • X-ray absorption study of the growth of Y2O3 on Si(001) (literal)
Abstract
  • YttriasY2O3 dis one of the candidate materials actively studied as a high dielectric constant replacement of amorphous silicon dioxide in downscaled microelectronic devices. An understanding of the physical properties of yttria epilayers on silicon is both a required prerequisite for applications and of fundamental interest. Using x-ray absorption spectroscopy at both the yttrium and oxygenKedges we study the local atomic and electronic structure in Y 2O3 epilayers deposited on Sis001d. We find that above a thin near - interface layer the epilayers have a local atomic and electronic structure bearing a close similarity to that of bulk yttria; however, there is an increase in static disorder with decreasing thickness which can be correlated to an increase of the defectiv-ity. The unoccupied electronic structure, as probed by near edge spectra at the cation and oxygen edges, is very similar to that of bulk yttria; we present and discuss simulations within the real - space full multiple scattering formalism which are quite successful in reproducing the experimental line shape. In the near - interface layer we detect the presence of silicon oxide, as reported for this and other systems previously; a new finding is that yttrium -silicon bonds are present in the interface layer, forming the precursors to the formation of yttrium silicide which develops into a long range ordered phase at higher deposition temperatures. We compare our observations with available theoretical predictions on the thermodynamic stability of yttria in comparison to silicon dioxide, yttrium silicide, and yttrium silicate; the predictions are not confirmed by experiment as far as the 2 nm thick interface layer is concerned. (literal)
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