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Lookup NU author(s): Amit Tiwari,
Dr Jon Goss,
Professor Patrick Briddon,
Professor Nick Wright,
Dr Alton Horsfall,
Dr Mark Rayson
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Diamond surfaces with suitable adsorbed chemical species can exhibit both negative and positive electron affinities, arising from the complex electrostatic interplay between adsorbates and surface carbon atoms of diamond lattice. We present the results of density functional calculations into the energetics and the electron affinity of diamond (100) surfaces terminated with the oxides of selected transition metals. We find that for a correct stoichiometty, oxides of transition metals, such as Ti and Zn, exhibit a large negative electronic affinity of around 3 eV. The desorption of transition metal oxides is found to be highly endothermic. We therefore propose that transition metal oxides are promising for the surface coating of diamond-based electron emitters, as these exhibit higher thermal stability in comparison to the commonly used Cs-O termination, while retaining the advantage of inducing a large negative electron affinity.
Author(s): Tiwari AK, Goss JP, Briddon PR, Wright NG, Horsfall AB, Rayson MJ
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: 9th European Conference on Silicon Carbide and Related Materials
Year of Conference: 2013
Online publication date: 01/01/2013
Publisher: Trans Tech Publications, Inc.
Library holdings: Search Newcastle University Library for this item
Series Title: Materials Science Forum