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Conductivity and thermoelectric power of trigonal Se x Te 1− x single crystals
Author(s) -
Beyer W.,
Mell H.,
Stuke J.
Publication year - 1971
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.2220450116
Subject(s) - seebeck coefficient , trigonal crystal system , conductivity , condensed matter physics , electrical resistivity and conductivity , activation energy , materials science , thermoelectric effect , chemistry , crystallography , thermodynamics , physics , crystal structure , quantum mechanics
Conductivity σ and thermoelectric power α of SeTe mixed crystals have been measured in the temperature range from 100 K up to the melting points. The activation energy of the intrinsic conductivity shows a relatively complicated dependence on alloy composition, which can be explained by a transition from the direct gap of Te to the indirect gap of Se at about 40% Se content. The extrinsic conductivity has an activation character in a large part of the system. Formally the activation energy Δ E has to be attributed to the mobility. It decreases continuously towards Te and vanishes at the high Te end. Δ E can be explained by a strongly inhomogeneous hole concentration as for trigonal Se. The density of states mass of holes has been estimated, which increases approximately linearly with Se content from 0.2 m 0 for Te to about 1.4 m 0 for Se.