Charge storage behavior of nanostructures based on SiGe nanocrystals embedded in Al2O3 matrix

  • Eliana M. F. Vieira
  • Sergey Levichev
  • Carlos J. Dias
  • Rui Igreja
  • Maja Buljan
  • Sigrid Bernstorff
  • Olinda Conde
  • Adil Chahboun
  • Anabela G. Rolo
  • Maria J. M. Gomes
Regular Article

Abstract

The charge storage behavior of nanostructures based on Si1−x Ge x (0 ≤ x ≤ 1) nanocrystals (NCs) in an Al2O3 matrix was investigated. The structures have been grown by RF magnetron sputtering and subsequently annealed at temperatures ranging from 700 °C to 1000 °C for 30 min in nitrogen ambient. The stoichiometry of the SiGe NCs and the alumina crystalline structure were found to be significantly dependent on the RF power and the annealing temperature. The sizes of the SiGe NCs and their distribution were investigated by grazing incidence small angle X-ray scattering (GISAXS). The capacitance-voltage (C-V) and conductance-voltage (G-V) measurements were performed to investigate the charge trapping characteristics of the memory structures. The C-V hysteresis width depends on variations in the crystalline structure resulting from different annealing temperatures. It is also shown that charge injection is governed by the Fowler-Nordheim tunnel mechanism for higher electric fields.

Keywords

Solid State and Materials 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Eliana M. F. Vieira
    • 1
  • Sergey Levichev
    • 1
  • Carlos J. Dias
    • 2
  • Rui Igreja
    • 2
  • Maja Buljan
    • 3
  • Sigrid Bernstorff
    • 4
  • Olinda Conde
    • 5
  • Adil Chahboun
    • 1
    • 6
  • Anabela G. Rolo
    • 1
  • Maria J. M. Gomes
    • 1
  1. 1.Centre of PhysicsUniversity of MinhoBragaPortugal
  2. 2.Departamento de Ciências dos Materiais/CENIMAT I3N, FCTUniversidade Nova LisboaCaparicaPortugal
  3. 3.Rudjer Boskovic InstituteZagrebCroatia
  4. 4.Elettra-Sincrotrone TriesteBasovizzaItaly
  5. 5.Physics DepartmentUniversity of Lisbon and ICEMSLisboaPortugal
  6. 6.Faculty of Sciences and Techniques, Physics DepartmentAbdelmalek Essaadi UniversityTangierMorocco

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