Publication details

Infrared vibrations of interstitial oxygen in silicon-rich SiGe alloys



Year of publication 2006
Type Article in Periodical
Magazine / Source Physica B
MU Faculty or unit

Faculty of Science

Field Solid matter physics and magnetism
Keywords Germaniumsilicon alloys; Oxygen; Infrared absorption
Description We report on the infrared spectra of the antisymmetric stretching vibration of Oi in Si-rich Si1xGex alloys. The shift of its frequency is obtained as a function of the germanium content x below 0:5. We present a decomposition of the low-temperature spectra using GaussLorentz profiles. A low-lying broad band is found for x ź 0:08, and assigned tentatively to the vibrations of Si2O units with the nearest sites occupied by several Ge atoms. We compare our experimental findings with results of a recent ab initio study of the phonon modes.
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