Role of interface suboxide Si atoms on the electronic properties of Si/SiO2 superlattices

  • Carrier P
  • Lu Z
  • Lewis L
 et al. 
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Abstract

Silicon/SiO2superlattices (SLs) are nanostructured thin films bearing multiple Si/SiO2interfaces. In such materials, silicon is walled by its oxide in order to generate multiple quantum wells. Here, the structural and electronic properties of a structurally-relaxed Si/SiO2SL model are studied using a first principles approach; the Si/SiO2interfaces contain all suboxide Si atoms (Si1+, Si2+, and Si3+). The valence and conduction band offsets (VBO and CBO) are evaluated from the relative shift between densities of states (DOSs) of Si atoms in bulk SiO2and in the SL. The CBO is shown to be reduced compared to the VBO. The DOSs of the three suboxide Si atoms are also calculated. It is shown that there are contributions from all suboxides at the threshold of the gap. © 2003 Elsevier Science B.V. All rights reserved.

Author-supplied keywords

  • Electronic properties
  • Low dimensional systems
  • Optical properties
  • Quantum wells
  • Silicon
  • Silicon dioxide

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Authors

  • P. Carrier

  • Z. H. Lu

  • L. J. Lewis

  • M. W C Dharma-Wardana

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