Magnetic-resonance studies of reactively sputtered amorphous silicon-hydrogen alloys
Proton magnetic resonance and EPR data are presented for several reactively sputtered amorphous silicon-hydrogen alloys and for a few amorphous silicon-hydrogen-deuterium alloys. Proton NMR absorption measurements are interpreted as evidence for significant inhomogeneity in the local hydrogen density: there is a phase of the material, in which the hydrogen bonded to Si is randomly distributed with average local density 3.39 x 10/sup 21/ cm/sup -3/; there is a hydrogen cluster defect with average local hydrogen density 4.34 x 10/sup 22/ cm/sup -3/; in the lower hydrogen concentration samples there is a third phase of the material which has no H. Proton NMR spin-lattice relaxation measurements as a function of both temperature and H concentration have been interpreted. The mechanism of spin-lattice relaxation in both cases involves spin diffusion to relaxation centers. In the low H concentration samples the relaxation centers are dangling bond electrons, while the centers in the high H samples appear to be three-center Si-H-Si bonds. EPR measurements on the dangling bond electrons are consistent with all of the above conclusions. A new very broad (approx. .1 Tesla) resonance has been detected in all of the samples and is tentatively interpreted in support of the existence of three-center bonds. 33 figures.
- Research Organization:
- Ames Lab., IA (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6599133
- Report Number(s):
- IS-T-1019; ON: DE83004958
- Resource Relation:
- Other Information: Thesis
- Country of Publication:
- United States
- Language:
- English
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Characterization of the protonic distribution and environment in amorphous silicon-hydrogen alloys using proton NMR and ESR
Characterization of the protonic distribution and environment in amorphous silicon-hydrogen alloys using proton NMR and ESR
Related Subjects
SILANES
MAGNETIC RESONANCE
STRUCTURAL CHEMICAL ANALYSIS
AMORPHOUS STATE
CHEMICAL COMPOSITION
DEUTERIUM COMPOUNDS
ELECTRON SPIN RESONANCE
EXPERIMENTAL DATA
NUCLEAR MAGNETIC RESONANCE
PROTONS
SPIN-LATTICE RELAXATION
SPUTTERING
TEMPERATURE DEPENDENCE
BARYONS
DATA
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HYDRIDES
HYDROGEN COMPOUNDS
INFORMATION
NUCLEONS
NUMERICAL DATA
RELAXATION
RESONANCE
SILICON COMPOUNDS
360602* - Other Materials- Structure & Phase Studies