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Characterization of the Structure in Hydrogenated Amorphous Silicon by Means of 119Sn Mössbauer Spectroscopy

The network structure in hydrogenated amorphous silicon (a-Si:H) films including a small amount of tin has been investigated by means of Mössbauer spectroscopy. The quadrupole splitting Δ of 119Sn nuclei in a-Si:H films is very sensitive to the difference in the hydrogen bonding configuration, and is concluded to be a useful parameter for the characterization of the amorphous structure. The relation between Δ and the IR spectra shows that the over-constrained region is formed in the a-Si:H network by the SiH group.