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- W2010353491 abstract "Hydrogen $({mathrm{H}}_{2})$ dilution of the source gas is known to be a key factor in producing hydrogenated amorphous silicon films that demonstrate a high degree of optoelectronic stability. In this work, we investigate, using Raman spectroscopy and high-resolution transmission electron microscopy (TEM), whether microstructural differences exist between such films and those made with no ${mathrm{H}}_{2}$ dilution (i.e., that have greater instabilities). The key variable is the ${mathrm{H}}_{2}$ dilution, which ranges from none to very high levels, producing amorphous and microcrystalline silicon films. The TEM results show that embedded within the amorphous matrix are chainlike objects (CLO's) having ensuremath{sim}3 nm widths, ensuremath{sim}30 nm lengths, and showing a high degree of order along their length. Such order implies vanishing levels of bond-angle distortion (BAD). These CLO's are present in all samples investigated, but their density increases with the level of ${mathrm{H}}_{2}$ dilution. The Raman spectra show a TO band centered at $490 {mathrm{cm}}^{ensuremath{-}1}$ $(37ifmmodepmelsetextpmfi{}3{mathrm{cm}}^{mathrm{ensuremath{-}}1}$ full width). Quantitative analysis shows this band to exist in all samples investigated, but increases in magnitude with increasing ${mathrm{H}}_{2}$ dilution. In the highest dilutions when microcrystallites are observed, the band is distinctly evident. Its position and width are also consistent with very low (crystallinelike) levels of BAD ensuremath{sim}0ifmmode^circelsetextdegreefi{}. It is thus likely the $490 {mathrm{cm}}^{ensuremath{-}1}$ Raman band is a signature of the intermediate ordered CLO's." @default.
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- W2010353491 date "2001-03-13" @default.
- W2010353491 modified "2023-09-27" @default.
- W2010353491 title "Heterogeneity in hydrogenated silicon: Evidence for intermediately ordered chainlike objects" @default.
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- W2010353491 doi "https://doi.org/10.1103/physrevb.63.125338" @default.
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