Conductivity and thermoelectric power of trigonal SexTe1−x single crystals

✍ Scribed by W. Beyer; H. Mell; J. Stuke

• Publisher: John Wiley and Sons
• Year: 1971
• Tongue: English
• Weight: 650 KB
• Volume: 45
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/pssb.2220450116

✦ Synopsis

Abstract

Conductivity σ and thermoelectric power α of SeTe 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.