Band-Offset and Electronic Properties of Type II PbTe/PbS Superlattices

摘要: Semimetallic conductivity was observed in PbTe/PbS SŁ obtained by a "hot wall" technique on (001) KCl substrates with PbTe buffer layers. From the analysis of RH(H) and p┴(H) dependencies Monte—Carlo fitting procedure band offset DE„ = 0.32 ± 0.05 eV (T 77 K) it proved that these SŁs are type II "misaligned" structures. The calculations structure SLs showed such semimetal—semiconductor transition should occur for layer thicknesses about 60=70 A.