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EPR investigation of a-Si:H aerosol particles formed under silane thermal decomposition

  • A. A. Onischuk
  • R. I. Samoilova
  • V. P. Strunin
  • E. N. Chesnokov
  • R. N. Musin
  • V. S. Bashurova
  • A. G. Maryasov
  • V. N. Panfilov
Article

Abstract

The dangling bond defects were investigated in a-Si:H particles formed under silane thermal decomposition in flow reactor. EPR together with hydrogen evolution method were used. The experimental results allowed us to conclude that there are two kinds of dangling bond defects in a-Si:H aerosol particles. The defects of the first kind are localized on the surface of interconnected microvoids and microchannels (surface dangling bonds) and those of the second kind are embedded in amorphous silicon network (volume dangling bonds). The thermal equilibration of dangling bonds and temperature dependence of equilibrium dangling bond concentration were investigated. It was found that at temperatures > 400 K the dangling bond concentrationNApplied Magnetic Resonance s reversibly depends on sample temperature. The volume dangling bond concentration increases with temperature increasing (the effective activation energy of dangling bond formationU > 0), and the surface dangling bond concentration decreases with temperature increasing (U < 0). It has been found that EPR line is considerably asymmetric for samples with high hydrogen content and for low hydrogen content the EPR line is weakly asymmetric. A conclusion was drawn that the asymmetry degree depends on amorphous silicon lattice distortions. This conclusion has been confirmed by EPR spectra simulations.

Keywords

Aerosol Particle Hydrogen Evolution Dangling Bond Bond Concentration Silicon Network 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 1998

Authors and Affiliations

  • A. A. Onischuk
    • 1
  • R. I. Samoilova
    • 1
  • V. P. Strunin
    • 1
  • E. N. Chesnokov
    • 1
  • R. N. Musin
    • 1
  • V. S. Bashurova
    • 1
  • A. G. Maryasov
    • 1
  • V. N. Panfilov
    • 1
  1. 1.Institute of Chemical Kinetics and CombustionNovosibirskRussian Federation

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