The Structure, Optical and Thermoelectric Properties of Vapor-Phase PbTe:Sb/(0001) Mica Condensates
Journal Title: Фізика і хімія твердого тіла - Year 2014, Vol 15, Issue 1
Abstract
There is spending the study of vapor-phase thin film PbTe:Sb structures, which have been obtained in open vacuum on (0001) mica - muscovite brand MTA . Using atomic force microscopy (AFM) there is revealed that the origin of the vapor-phase condensates have been done by Folmera-Weber mechanism of synergistic implementation processes associated with stages of nucleation islands , their aggregation and coalescence, and formed nanocrystals are trigonal pyramids with {100} facets and ( 111) base, parallel to the substrate surface . It is shown that the infrared (IR ) “absorption – reflection” spectra of PbTe:Sb/( 0001) mica condensates with thickness (0,27-2,43 ) micron are containing reflection of mica and intense band interference. Optical bandgap of 0.25 atomic % Sb is Eg300K = (0,11-0,13) eV, which is four times less in comparison with the undoped material ( Eg300K = 0.32) eV). Stable n- type conductivity and high concentration of electrons (1019-1020) cm -3 doped condensates have been explained by the dominance of substitution of lead Sb3+ ions of Pb2+ in the cationic sublattice of the basic matrix (Sb3+ → Sb1+Pb) that are effective donors.
Authors and Affiliations
D. M. Freik, G. D. Mateik, Ya. S. Yavorskiy, G. D. Shimko
Keywords
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