Unification of the phonon mode behaviour in semiconductor alloys
نویسندگان
چکیده
This work concludes a series of systematic re-examinations of the Raman/Infrared spectra of representative semiconductor alloys in the traditionally admitted classification of phonon mode behaviour, i.e. In1−xGaxAs (1-bond→1-mode), In1−xGaxP (modified 2-mode) and presently ZnTe1−xSex (2-bond→1-mode), based on a crude description of the alloy disorder at the macroscopic scale in terms of the virtual crystal approximation (VCA). Here we show that the latter alloy obeys the same phonon mode behaviour as the former two, thereby a universal one, of a percolation type (1-bond→2-mode). The ‘VCA→Percolation’ change of paradigm confers to vibrational spectroscopies the attractive privilege to provide natural insight into the alloy disorder at the unusual mesoscopic scale, with potential interest for the study of the long scale (self) organization in alloys, in general.
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تاریخ انتشار 2008