A synchrotron-based photoemission study of the MoO{sub 3}/Co interface

Journal Article · Fri Jan 21 00:00:00 EST 2011 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.3546034· OSTI ID:21559985

Yuzhan, Wang; Shi, Chen; Wei, Chen; Wee, Andrew T. S. ^[1]; Ming, Yang; Dongchen, Qi ^[1]; Xingyu, Gao ^[1]

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1. Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542 (Singapore)

The electronic structures at the MoO{sub 3}/Co interface were investigated using synchrotron-based ultraviolet and x-ray photoelectron spectroscopy. It was found that interfacial chemical reactions lead to the reduction of Mo oxidation states and the formation of Co-O bonds. These interfacial chemical reactions also induce a large interface dipole, which significantly increases the work function of the cobalt substrate. In addition, two interface states located at 1.0 and 2.0 eV below the Fermi level are identified. These two states overlap at film thickness of between 2-4 nm, which suggests the MoO{sub 3} intermediate layer may facilitate ohmic charge transport.

• OSTI ID: 21559985
• Journal Information: Journal of Chemical Physics, Vol. 134, Issue 3; Other Information: DOI: 10.1063/1.3546034; (c) 2011 American Institute of Physics; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CHARGE TRANSPORT
COBALT
DIPOLES
ELECTRONIC STRUCTURE
FERMI LEVEL
FILMS
INTERFACES
LAYERS
MOLYBDENUM OXIDES
OXIDATION
PHOTOEMISSION
REDUCTION
SUBSTRATES
SURFACES
SYNCHROTRON RADIATION
SYNCHROTRONS
THICKNESS
ULTRAVIOLET RADIATION
WORK FUNCTIONS
X-RAY PHOTOELECTRON SPECTROSCOPY
ACCELERATORS
BREMSSTRAHLUNG
CHALCOGENIDES
CHEMICAL REACTIONS
CYCLIC ACCELERATORS
DIMENSIONS
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELEMENTS
EMISSION
ENERGY LEVELS
FUNCTIONS
METALS
MOLYBDENUM COMPOUNDS
MULTIPOLES
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
RADIATIONS
REFRACTORY METAL COMPOUNDS
SECONDARY EMISSION
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS