Faculté des sciences

Reversible control of the electronic density of states at the Fermi level of Ca₃Co₄O9+δ misfit-layered oxide single crystals through O⁺/H⁺ plasma exposure

Moser, D. ; Garnier, Michael G. ; Karvonen, L. ; Shkabko, A. ; Aebi, Philipp ; Weidenkaff, A.

In: Journal of Materials Science, 2012, p. -

Misfit-layered Ca₃Co₄O₉ crystals were grown and characterized via XRD, SEM, and photo-emission spectroscopy (PES). The evolution of the intensity at the Fermi level (E F) with varying oxygen content was studied by PES. Oxygen species were successfully introduced and removed through O⁺ and H⁺ microwave-plasma (2.45 GHz, 2–5 mbar) treatments, respectively. A 5 min... Plus

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    Summary
    Misfit-layered Ca₃Co₄O₉ crystals were grown and characterized via XRD, SEM, and photo-emission spectroscopy (PES). The evolution of the intensity at the Fermi level (E F) with varying oxygen content was studied by PES. Oxygen species were successfully introduced and removed through O⁺ and H⁺ microwave-plasma (2.45 GHz, 2–5 mbar) treatments, respectively. A 5 min O⁺ plasma exposure was observed to result into a drastic enhancement in the E F intensity, demonstrating the influence of oxygen content to the charge carrier population in layered cobalt-oxide materials.