OPTICAL-PROPERTIES OF PBS CDS SUPERLATTICES GROWN BY PULSED-LASER EVAPORATION/

PbS/CdS superlattices have been grown on BaF2, CaF2, Si and glass subs trates. Each specimen contained 10 to 23 pairs of the PbS/CdS layers. Absorption spectra of the structures have shown specific steps. The en ergy distribution of the steps has been analysed using models of Tipe- I and Tipe-II superlattices. Experimental results have been shown to f ollow the theoretical values of the steps for Tipe-II superlattices. T his gives a foundation for classifying PbS/CdS superlattices as Tipe-I I.