A small angle neutron scattering (SANS) study of hydrogen in hydrogenated amorphous silicon

Previous experiments have demonstrated unambiguously that a small fraction of the hydrogen in hydrogenated amorphous silicon is present as H 2 molecules trapped in the cages of the amorphous network. In the present paper, small angle neutron scattering (SANS) is employed to investigate the size of t...

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Bibliographic Details
Published in:	Journal of non-crystalline solids Vol. 196; no. 1-3; pp. 260 - 266
Main Authors:	Guy, Carlo A., Wright, Adrian C., Sinclair, Roger N., Stewart, Roger J., Jansen, Frank
Format:	Journal Article Conference Proceeding
Language:	English
Published:	Amsterdam Elsevier B.V 1996 Elsevier
Subjects:	Condensed matter: structure, mechanical and thermal properties Disordered solids Exact sciences and technology Glasses Physics Structure of solids and liquids; crystallography Semiconductor materials Neutron scattering Impurities Nonmetals Hydrogen additions Small angle scattering Silicon Hydrogen molecules Experimental study Impurity trapping Amorphous state structure
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Summary:	Previous experiments have demonstrated unambiguously that a small fraction of the hydrogen in hydrogenated amorphous silicon is present as H 2 molecules trapped in the cages of the amorphous network. In the present paper, small angle neutron scattering (SANS) is employed to investigate the size of the cages containing the H 2 molecules and yields a mean radius of6.5 Å. The use of H-D contrast techniques indicates that each cage contains, on average, about 60 H 2 (D 2) molecules. Data are also reported for a partially fluorinated sample and are consistent with a previously suggested model of network cages predominantly containing molecular SiF 4.
ISSN:	0022-3093 1873-4812
DOI:	10.1016/0022-3093(96)80011-1