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- W2034768352 abstract "Infrared absorption spectra were investigated in hydrogenated amorphous silicon (a-Si(H)) films deposited both by d.c. reactive sputtering (RS) and by r.f. glow discharge (GD) of silane. The films were deposited onto polished niobium and tungsten solar test disks to form spectrally selective absorbers for comparative photothermal and photovoltaic studies. Spectra were observed from the normal spectral reflectance from 400 to 3900 cm-1 with a Fourier transform spectrometer. Hydrogen, alloyed typically at 10–35 at.% in these a-Si films, significantly reduces the gap state density and produces IR spectra characteristic of Si-H bonding complexes depending on the deposition method and the substrate temperature TD. Comparison between RS and GD films revealed significant differences in their IR spectra. RS films show a strong Si-O-Si bonding absorption from atmospheric oxygen. GD films have a marked Si-H wagging mode absorption resolved into three components. This band is very sensitive to the deposition conditions and decays with increasing TD. The SiH3 rocking mode was identified at 500 cm-1 in the GD films. The hydrogen concentration from the IR stretching mode absorption was correlated with the H2 evolution results of McMillan and Peterson on identical films. The transition with increasing TD could be traced from the room temperature state with polymeric complexes of hydrogen to the high temperature state with the single monohydride complex." @default.
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- W2034768352 date "1979-10-01" @default.
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- W2034768352 title "Infrared spectra of the hydrogenated amorphous silicon layers on metallic substrates of solar absorbers" @default.
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- W2034768352 doi "https://doi.org/10.1016/0040-6090(79)90122-6" @default.
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