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Ultra thin transition metal oxide coatings on diamond for thermionic applications

Tiwari, AK, Goss, JP, Briddon, PR, Wright, NG, Horsfall, AB and Rayson, MJ (2013) Ultra thin transition metal oxide coatings on diamond for thermionic applications Materials Research Society Symposium Proceedings, 1511. pp. 13-18.

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We have investigated, using density functional simulations, the energetics and the electronic properties of oxides of selected transition metals, TMs, adsorbed onto a diamond (001) surface. We find that stoichiometric oxides of TMs, particularly Ti and Zn, influence the electron affinity of diamond strongly. The electron affinities of stoichiometric oxides of Ti and Zn are calculated to be around -3eV, significantly higher than 1.9eV of commonly used H-termination. The reactions of TMs with an oxygenated diamond are found to be highly exothermic. Based upon the energetics and the electronic properties, we propose that in the regime of ultra thin films, oxides of TMs are promising options for surface coating of diamond-based electron emitters, as these coatings are compatible with semiconductor device fabrication processes, while having the benefit of inducing a large negative electron affinity. © 2012 Materials Research Society.

Item Type: Article
Divisions : Surrey research (other units)
Authors :
Tiwari, AK
Goss, JP
Briddon, PR
Wright, NG
Horsfall, AB
Date : 1 January 2013
DOI : 10.1557/opl.2012.1662
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:16
Last Modified : 24 Jan 2020 23:42

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