Experimental and theoretical investigation of the electronic structure of Cu2O and CuO thin films on Cu(110) using x-ray photoelectron and absorption spectroscopy

The electronic structure of Cu2O and CuO thin films grown on Cu(110) was characterized by X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS). The various oxidation states, Cu0, Cu+, and Cu2+, were unambiguously identified and characterized from their XPS and XAS spectra....

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Detalles Bibliográficos
Autores principales: Jiang, Peng, Prendergast, David, Borondics, Ferenc, Porsgaard, Soeren, Giovanetti, Lisandro José, Pach, Elzbieta, Newberg, John, Bluhm, Hendrik, Besenbacher, Flemming, Salmeron, Miquel
Formato: Articulo
Lenguaje:Inglés
Publicado: 2013
Materias:
Física
Química
Ab initio calculations
Density functional theory
Copper compounds
Electronic structure
Oxidation
Stoichiometry
Thin films
X-ray absorption spectra
X-ray photoelectron spectra
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/96803
https://ri.conicet.gov.ar/11336/82185
https://aip.scitation.org/doi/abs/10.1063/1.4773583
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
Descripción
Sumario:The electronic structure of Cu2O and CuO thin films grown on Cu(110) was characterized by X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS). The various oxidation states, Cu0, Cu+, and Cu2+, were unambiguously identified and characterized from their XPS and XAS spectra. We show that a clean and stoichiometric surface of CuO requires special environmental conditions to prevent loss of oxygen and contamination by background water. First-principles density functional theory XAS simulations of the oxygen K edge provide understanding of the core to valence transitions in Cu+ and Cu 2+. A novel method to reference x-ray absorption energies based on the energies of isolated atoms is presented.

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