Deuterium nuclear magnetic resonance study of the photo-induced metastability in hydrogenated amorphous silicon

Miscellaneous · Wed Jan 01 00:00:00 EST 1992

OSTI ID:7165914

Corey, R L

Deuteron nuclear magnetic resonance (DMR) measurements at 30 K were made in a search for photo-induced atomic rearrangements in hydrogenated amorphous silicon (a-Si:D,H) films. DMR line shapes were obtained using a probe designed to observe DMR signals before (a dark annealed state), during, and after illumination of the a-Si:D,H sample. Reversible, photo-induced electron spin resonance derivative signal intensity increases accompanied the sample illuminations and anneals. The DMR line shapes were subtracted from each other to generate difference spectra in which photo-induced changes could be observed. The line shapes displayed differences not only between the post-illuminated and dark annealed states but also different differences between the during illumination state and post and pre-illuminated states. Several line shape components arising from molecular and tightly bonded deuteron species did not contribute to the difference signal, indicating a dominant, localized photo-induced change in the film. The difference spectra appear to be composed of both an antisymmetric and symmetric component, possibly arising from a contact interaction with a photo-induced defect and a photo-induced structural rearrangement respectively.

• Research Organization: Washington Univ., Seattle, WA (United States)
• OSTI ID: 7165914
• Resource Relation: Other Information: Thesis (Ph.D.)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
SILICON
DEUTERON SPECTRA
NMR SPECTRA
PHOTOCHEMICAL REACTIONS
AMORPHOUS STATE
STRUCTURAL CHEMICAL ANALYSIS
CHEMICAL REACTIONS
ELEMENTS
SEMIMETALS
SPECTRA
360602* - Other Materials- Structure & Phase Studies
400500 - Photochemistry