Negative electron affinity from aluminium on the diamond (1 0 0) surface: a theoretical study

Paul May, Neil Allan, Michael James, Alex Croot

Research output: Contribution to journalArticle (Academic Journal)

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Abstract

Density functional theory calculations were performed to model the adsorption of up to 1 monolayer (ML) of aluminium on the bare and O-terminated (1 0 0) diamond surface. Large adsorption energies of up to  −6.36 eV per atom are observed for the Al-adsorbed O-terminated diamond surface. Most adsorption sites give a negative electron affinity (NEA), with the largest NEAs  −1.47 eV on the bare surface (1 ML coverage) and  −1.36 eV on the O-terminated surface (0.25 ML coverage). The associated adsorption energies per Al atom for these sites are  −4.11 eV and  −5.24 eV, respectively. Thus, with suitably controlled coverage, Al on diamond shows promise as a thermally-stable surface for electron emission applications.
Original languageEnglish
Article number235002
Number of pages10
JournalJournal of Physics Condensed Matter
Volume30
Issue number23
Early online date15 May 2018
DOIs
Publication statusPublished - 13 Jun 2018

Keywords

  • Diamond
  • negative electron affinity
  • Aluminium

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