6533b7dbfe1ef96bd1271318
RESEARCH PRODUCT
Optical, X-ray absorption and photoelectron spectroscopy investigation of the Co site configuration in Zn1−xCoxO films prepared by pulsed laser deposition
J. SusiniJuan Angel SansAlfredo SeguraE. GuillotelJuan F. Sánchez-royoGema Martínez-criadoAdela Muñoz-páezVictor Lopez-floresJulio Pellicer-porressubject
Materials scienceExtended X-ray absorption fine structureAbsorption spectroscopyAnalytical chemistryCondensed Matter PhysicsXANESPulsed laser depositionAbsorption edgeX-ray photoelectron spectroscopyGeneral Materials ScienceElectrical and Electronic EngineeringAtomic physicsThin filmAbsorption (electromagnetic radiation)description
Abstract In this paper, we investigate the Co site configuration in Zn1−xCoxO thin films by means of different spectroscopic techniques. Thin films were prepared by pulsed laser deposition with Co proportion from 1% to 30%. The Co 2p doublet observed in the X-ray photoelectron spectra exhibits the spin–orbit splitting and shake-up satellites typical of Co+2 ionization states. X-ray absorption spectra at the Co K-edge, taken in fluorescence mode, unambiguously show that Co atoms are in tetrahedral configuration substituting for Zn over the whole composition range. Optical absorption spectra provide further evidence of the tetrahedral coordination of Co cations, both through the internal transitions in the Co 3d shell and through the shift to higher energies of the band-to-band absorption edge with the increase of the Co proportion.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-07-01 | Superlattices and Microstructures |