Electron affinity of cubic boron nitride terminated with vanadium oxide

Yu Yang, Tianyin Sun, Joseph Shammas, Manpuneet Kaur, Mei Hao, Robert Nemanich

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A thermally stable negative electron affinity (NEA) for a cubic boron nitride (c-BN) surface with vanadium-oxide-termination is achieved, and its electronic structure was analyzed with in-situ photoelectron spectroscopy. The c-BN films were prepared by electron cyclotron resonance plasma-enhanced chemical vapor deposition employing BF3 and N2 as precursors. Vanadium layers of ∼0.1 and 0.5 nm thickness were deposited on the c-BN surface in an electron beam deposition system. Oxidation of the metal layer was achieved by an oxygen plasma treatment. After 650 °C thermal annealing, the vanadium oxide on the c-BN surface was determined to be VO2, and the surfaces were found to be thermally stable, exhibiting an NEA. In comparison, the oxygen-terminated c-BN surface, where B2O3 was detected, showed a positive electron affinity of ∼1.2 eV. The B2O3 evidently acts as a negatively charged layer introducing a surface dipole directed into the c-BN. Through the interaction of VO2 with the B2O3 layer, a B-O-V layer structure would contribute a dipole between the O and V layers with the positive side facing vacuum. The lower enthalpy of formation for B2O3 is favorable for the formation of the B-O-V layer structure, which provides a thermally stable surface dipole and an NEA surface.

Original languageEnglish (US)
Article number165310
JournalJournal of Applied Physics
Volume118
Issue number16
DOIs
StatePublished - Oct 28 2015

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vanadium oxides
boron nitrides
electron affinity
negative electron affinity
dipoles
oxygen plasma
electron cyclotron resonance
vanadium
enthalpy
photoelectron spectroscopy
vapor deposition
electron beams
electronic structure
vacuum
oxidation
annealing
oxygen
metals

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Electron affinity of cubic boron nitride terminated with vanadium oxide. / Yang, Yu; Sun, Tianyin; Shammas, Joseph; Kaur, Manpuneet; Hao, Mei; Nemanich, Robert.

In: Journal of Applied Physics, Vol. 118, No. 16, 165310, 28.10.2015.

Research output: Contribution to journalArticle

Yang, Yu ; Sun, Tianyin ; Shammas, Joseph ; Kaur, Manpuneet ; Hao, Mei ; Nemanich, Robert. / Electron affinity of cubic boron nitride terminated with vanadium oxide. In: Journal of Applied Physics. 2015 ; Vol. 118, No. 16.
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