Abstract

CdS 1− x Se x crystals of two different compositions ( x=0.5 and 0.25) have been investigated by high resolution transmission electron microscopy and cathodoluminescence measurements. The first time, it could be established that inside the single CdS 1− x Se x crystals (hexagonal structure), many stacking faults exist which correlate to lamellae of cubic structure. Independent of their chemical composition intrinsic stacking faults of types I 1 and I 2 are the predominant defects in all the crystals examined. Moreover, a noticeable difference in the cathodoluminescence spectra could be observed for regions mainly having a hexagonal structure and from regions containing stacking faults.

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