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Fluorine atoms interaction with the nanoporous materials: experiment and DFT simulation

  • Yuri A. Mankelevich
  • Ekaterina N. VoroninaEmail author
  • Tatyana V. Rakhimova
  • Alexander P. Palov
  • Dmitry V. Lopaev
  • Sergey M. Zyryanov
  • Mikhail R. Baklanov
Regular Article
Part of the following topical collections:
  1. Topical Issue: Many Particle Spectroscopy of Atoms, Molecules, Clusters and Surfaces

Abstract

Fluorine atoms interactions with organosilicate glass (OSG)-based low-κ dielectric films are experimentally and theoretically studied. One-dimensional 1-D Monte Carlo & gas-surface kinetics (MC&GSK) model and density functional theory (DFT) simulations used for the development of the multi-step mechanism of OSG films damage and etching are further verified on FTIR spectroscopy data. DFT method is applied to calculate vibrational mode frequencies and their shifts under F atoms flux. In the frame of 1-D model, evolutions of the SiCH3 and appeared SiCH x F y surface groups distributions inside the porous films are calculated as a function of F atoms dose. F atoms quasi-chemisorption on surface SiO x groups accompanied by fourth-coordinated Si atoms transition to pentavalent Si states is related with the experimentally observed fast fluorination stage and vibrational frequency shifts. In addition, quasi-chemisorbed F atoms induce the weakening of the adjacent Si–O bonds in O x SiF y surface complexes promoting breaks of these Si–O bonds under further F atoms attacks. Quasi-chemisorbed F atoms could be also responsible for F atoms recombination on SiO x surfaces.

Graphical abstract

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Yuri A. Mankelevich
    • 1
  • Ekaterina N. Voronina
    • 2
    Email author
  • Tatyana V. Rakhimova
    • 1
  • Alexander P. Palov
    • 1
  • Dmitry V. Lopaev
    • 1
  • Sergey M. Zyryanov
    • 1
    • 2
  • Mikhail R. Baklanov
    • 1
  1. 1.Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State UniversityMoscowRussia
  2. 2.Faculty of Physics, Lomonosov Moscow State UniversityMoscowRussia

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