Band-Offset and Electronic Properties of Type II PbTe/PbS Superlattices
F.F. Sizov, J.V. Gumenjuk-Sichevskaya, V.V. Tetyorkin and V.V. Zabudsky
Institute of Semiconductor Physics of the National Ukrainian Academy of Sciences, 252028, pr. Nauki 45, Kiev, Ukraine
Full Text PDF
Semimetallic conductivity was observed in PbTe/PbS SL obtained by a "hot wall" technique on (001) KCl substrates with (001) PbTe buffer layers. From the analysis of RH(H) and p(H) dependencies by the Monte-Carlo fitting procedure the band offset ΔEv = 0.32 ± 0.05 eV was obtained (T = 77 K) and it was proved that these SLs are type II "misaligned" structures. The calculations of the band structure of PbTe/PbS SLs showed that in such SLs a semimetal-semiconductor transition should occur for layer thicknesses of about 60÷70 Å.
DOI: 10.12693/APhysPolA.87.441
PACS numbers: 68.65.+g