Über die Halbleitereigenschaften des Silbertellurids (Ag₂Te)

Abstract

Es werden die Ergebnisse von Leitfähigkeits‐ und Halleffektmessungen sowie Untersuchungen der Magnetfeldabhängigkeit im Temperaturgebiet zwischen +20°C und ‐190°C mitgeteilt. Der Einfluß geringer Abweichungen von der stöchiometrischen Zusammensetzung wurde untersucht. Schließlich wird ein Bild des Leitungsmechanismus entworfen, das die Ergebnisse widerspruchsfrei zu erklären vermag.

A Chemical, High-Temperature Way to Ag1.9Te via Quasi-Topotactic Reaction of Stuetzite-type Ag1.54Te: Structural and Thermoelectric Properties

“…Polycrystalline bulk α-Ag 2 Te shows a thermoelectric figure of merit ZT of 0.27 at 370 K, which can be improved to a ZT of 0.55 at 400 K being a reasonable value for applications. , In contrast to this, only limited information is known for stuetzite or Ag 1.9 Te concerning these properties. In a study where a mixture of 40–45 wt % tellurium was present (stuetzite is ∼38 wt %) the authors found promising Seebeck values of 290 to 360 μV K –1 and electrical conductivities of 2 to 20 S cm –1 . The lack of both structural and thermoelectric information triggered us to analyze stuetzite and Ag 1.9 Te in more detail to close this gap.…”

“…In a study where a mixture of 40−45 wt % tellurium was present (stuetzite is ∼38 wt %) the authors found promising Seebeck values of 290 to 360 μV K −1 and electrical conductivities of 2 to 20 S cm −1 . 31 The lack of both structural and thermoelectric information triggered us to analyze stuetzite and Ag 1.9 Te in more detail to close this gap.…”