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Unexpected change in the electron affinity of diamond caused by the ultra-thin transition metal oxide films

Lookup NU author(s): Dr Amit Tiwari, Professor Jon Goss, Professor Patrick Briddon, Dr Alton Horsfall, Professor Nick Wright, Dr Mark Rayson

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Abstract

The energetics and electronic properties of oxides of selected transition metals (Cu,Ni, Ti and Zn) adsorbed onto a diamond (001) surface are examined using density functional simulations. We find that the stoichiometric oxides of Ti and Zn exhibit large negative electronic affinities of around 3 eV, whereas the oxides Cu and Ni have a relatively small impact on the affinity. Although reactions of most metal oxides with the diamond surface are exothermic in nature, we propose that titanium, which exhibit large binding energies per metal atom in addition to a large negative electron affinity, is of particular interest for the surface coating of diamond-based electron emitters.

Publication metadata

Author(s): Tiwari AK, Goss JP, Briddon PR, Horsfall AB, Wright NG, Jones R, Rayson MJ

Publication type: Article

Publication status: Published

Journal: Europhysics Letters

Year: 2014

Volume: 108

Issue: 4

Online publication date: 24/11/2014

Acceptance date: 05/11/2014

Date deposited: 14/01/2015

ISSN (print): 0295-5075

ISSN (electronic): 1286-4854

Publisher: EDP Sciences

URL: http://dx.doi.org/10.1209/0295-5075/108/46005

DOI: 10.1209/0295-5075/108/46005

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