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- W2024264716 abstract "The effect of hydrogenation on the local order in amorphous germanium has been studied by EXAFS. Measurements have been carried out on sputtered a-Ge:H films with hydrogen concentrations of 0, 7, 10, and 15 at.%, as a function of temperature in the range 11 - 300 K. The first-shell EXAFS data were analysed by the ratio method based on cumulant expansion. The asymmetric distributions reconstructed from cumulants are in very good agreement with a parametrized distribution obtained by other researchers using calculated phase-shifts. For the unhydrogenated a-Ge (deposited at ), increases of the interatomic distance, at 11 K, static disorder, , and thermal disorder, , have been found with respect to those for c-Ge. Both the static and the thermal disorder are smaller than for an evaporated sample (deposited at ) previously studied. The insertion of hydrogen in a-Ge produces a sharp reduction of the interatomic distance, static disorder, and asymmetry of the distribution already at the lowest H concentration (7%); then these parameters decrease almost linearly when the hydrogen content increases. No appreciable influence of hydrogenation on the thermal disorder has been detected." @default.
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- W2024264716 date "1997-07-07" @default.
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- W2024264716 title "Local order in hydrogenated amorphous germanium thin films studied by extended x-ray absorption fine-structure spectroscopy" @default.
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- W2024264716 doi "https://doi.org/10.1088/0953-8984/9/27/017" @default.
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