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Reflectivity Spectra of the Rhombohedral Crystals Bi 2 Te 3 , Bi 2 Se 3 , and Sb 2 Te 3 over the Range from 0.7 to 12.5 eV
Author(s) -
Sobolev V. V.,
Shutov S. D.,
Popov Yu. V.,
Shestatskii S. N.
Publication year - 1968
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19680300141
Subject(s) - bismuth , reflectivity , trigonal crystal system , spectral line , band gap , crystallography , materials science , tellurium , chemistry , crystal structure , optics , physics , optoelectronics , astronomy , metallurgy
The reflectivity spectra (polarisation E ⟂ c ) of the homologous group of rhombohedral crystals Bi 2 Te 3 , Bi 2 Se 3 , and Sb 2 Te 3 have been investigated in the range 0.7 to 12.5 eV. The complex structure of the two reflectivity main maxima, lying in the range 1 to 5 and 6 to 11 eV, respectively, and its similarity in all three crystals have been established. The energy variation of the reflectivity peaks in dependence of the atomic composition shows the anomalous decrease of the interband gaps in Sb 2 Te 3 respective to Bi 2 Te 3 . The results obtained are discussed in terms of published bismuth telluride band structure.