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Title: Electrotransport in metals : electroluminescence in zinc telluride
Author: Kennedy D. I.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1968
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(i) Electrotransport in Metals: The effects of an applied electric field on diffusion in metals is discussed. Frequently, under high current densities, and for temperatures in the diffusion range, a directed displacement of the diffusion species results. This mass transport is described by the term electrotransport. The major theoretical considerations relevant to the development of this topic are described, with particular emphasis on derivations which have been applied to the interpretation of experimental results. Previous experimental investigations of electrotransport in metals are reviewed. The results of experiments on electrotransport of indium, using a radioactive isotope technique, are presented. The investigations are concerned with the electrotransport of the isotope In114m in solid gold, thin gold films and thin indium films. Electrotransport phenomena in thin films have not previously been investigated in any detail. The results are amenable to interpretation in terms of the interaction of electrons with an activated complex associated with the diffusing species. (ii) Electroluminescence in Zinc Telluride: This section reports on the electroluminescent properties of the II VI semiconducting compound zinc telluride. Previous investigations into the preparation of zinc telluride crystals and the optical, electrical and electroluminescent properties of the material are reviewed. The results of an experimental programme concerned with the preparation of zinc telluride crystals and the electroluminescent properties of devices fabricated from several forms of the material are presented. Relatively simple contacting and processing techniques are utilised and the electroluminescence is primarily associated with metal :semiconductor junctions and contact barrier regions. Particular emphasis is placed on the observation of room- temperature electroluminescence in zinc telluride as this has not been the subject of previous detailed investigation. The incorporation of oxygen in the crystals results in radiative recombinations in which temperature quenching of the emission is not pro- nounced. This results in considerable improvement in room- tempera- ture emission efficiencies; the associated emission is located in the red region of the visible spectrum. Other forms of zinc telluride investigated include nominally undoped and semi -insulating single crystals and also polycrystalline material. The potential of electroluminescent devices based on these various forms of zinc telluride as room -temperature visible emitters is evaluated. Possible mechanisms of electroluminescence are discussed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available