Optical and electronic properties of one-dimensional Ca3Co2O6 thin films: Influence of the oxygen pressure

Moubah, R.; Colis, S.; Schmerber, G.; Petersen, J.; Dinia, A.
April 2009
Applied Physics Letters;4/6/2009, Vol. 94 Issue 14, p141907
Academic Journal
Thin films of Ca3Co2O6 were fabricated on c-cut sapphire substrates by pulsed laser deposition. The films are polycrystalline and can be grown in a large interval of oxygen pressure with significant influence on the film texture. X-ray photoelectron spectroscopy analyses indicated that only Co3+ ions are present in our samples for both octahedral and trigonal prismatic sites. The band gap measured by ultraviolet-visible light absorption experiments was found about 1.35 eV and slightly larger when the oxygen partial pressure during the deposition is increased from 10-3 to 7×10-2 mbar. Temperature dependent transport measurements showed a semiconducting behavior of the films and the associated band gap was found similar to the one evaluated by optical measurements and reported by theoretical studies.


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