1. Electrical conduction mechanism in films of [Se.sub.80-x][Te.sub.20][Bi.sub.x] (0 [less than or equal to] x [less than or equal to] 12) glassy alloys
- Author
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Deepika and Singh, Hukum
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Electrical conductivity -- Analysis ,Metallic glasses -- Electric properties ,Movies ,Specialty metals industry ,Microscopy ,X-ray diffraction ,Metals (Materials) ,Electron microscopy ,Alloys ,Physics - Abstract
This paper reports the study of DC electrical conductivity of films of [Se.sub.80-x][Te.sub.20][Bi.sub.x] (0 [less than or equal to] x [less than or equal to] 12) glasses prepared using physical vapor deposition method. The films were structurally characterized using X-ray diffraction (XRD) and transmission electron microscopy (TEM). TEM results indicate the formation of nanorods within the films. The electrical conductivity of the samples was studied using Keithley electrometer in the temperature range 303-373 K. The results show that conduction in these samples takes place via thermally assisted tunnelling and variable range hopping of charge carriers corresponding to higher and lower temperature ranges, respectively. Further, it was found that the conductivity increases with increase in Bi concentration in Se-Te system. This has been explained on the basis of chemically ordered network model. It was also found that nanorod formation improves the electrical conductivity of Se-Te-Bi system compared to bulk Se-Te-Bi system.Key words: glasses, nanorods, electrical conductivity, Mott's VRH model, hopping conduction.Nous etudions ici la conductivity electrique de films de verres [Se.sub.80- x][Te.sub.20][Bi.sub.x] (0 [less than or equal to] x [less than or equal to] 12), prepares par methode de deposition physique de vapeur. Les films sont caracterises par methodes CRX et MET. Les resultats MET indiquent la formation de nanotiges a l'interieur des films. La conductivity electrique est mesuree a l'aide d'un electrometre Keithley pour des temperatures de 303 a 373 K. Les resultats montrent que la conductivite dans ces echantillons se produit par effet tunnel assiste thermiquement et par mecanisme de saut a distance variable des porteurs de charge, correspondant a des domaines de plus hautes et de plus basses temperatures, respectivement. Nous trouvons egalement que la conductivite augmente avec l'augmentation de la concentration de Bi dans le compose. Ceci s'explique par le modele de reseau chimiquement ordonne. Nous trouvons egalement que la formation de nanotiges dans les films ameliore leur conductivite electrique. [Traduit par la Redaction]Mots-cles: nanotiges, conductivite electrique, modele de saut a distance variable 3D de Mott, conduction par mecanisme de sauts, verres., 1. IntroductionNanostructured semiconductors have gained significant interest in recent years due to their tunable band structure and enhanced electrical and optical properties. Nanostructured chalcogenide glasses are a new class of [...]
- Published
- 2019
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