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Related Experiment Videos

Molecular hydrogen in a-si:H

Fedders1, Leopold, Chan

  • 1Department of Physics, Washington University, St. Louis, Missouri 63130, USA.

Physical Review Letters
|September 16, 2000
PubMed
Summary
This summary is machine-generated.

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Nearly 40% of hydrogen in amorphous silicon films exists as molecular hydrogen. This discovery impacts understanding of defects and hydrogen movement in these materials.

Area of Science:

  • Materials Science
  • Solid State Physics
  • Semiconductor Physics

Background:

  • Hydrogenated amorphous silicon (a-Si:H) is crucial for electronic devices.
  • Understanding hydrogen's role is key to improving material stability and performance.
  • Previous models did not fully account for molecular hydrogen species.

Purpose of the Study:

  • To investigate the forms and locations of hydrogen within high-quality a-Si:H films.
  • To quantify the presence of molecular hydrogen and its bonding environment.
  • To assess the implications for material properties and defect formation.

Main Methods:

  • Advanced spectroscopic techniques were employed to probe hydrogen bonding.
  • Analysis focused on identifying signatures of molecular hydrogen (H2).

Related Experiment Videos

  • Hydrogen distribution was correlated with film microstructure.

    • Main Results:

    • Nearly 40% of hydrogen exists as molecular hydrogen (H2) in a-Si:H.
    • These H2 molecules are primarily trapped at tetragonal T sites.
    • The majority of H2 resides in the less-clustered hydrogen component.

    Conclusions:

    • A significant fraction of hydrogen in a-Si:H exists as molecular H2.
    • This finding necessitates a revision of models for hydrogen behavior.
    • The presence of H2 impacts understanding of light-induced defects and hydrogen diffusion.