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Ternary Zn 1−x Co x O crystalline films with different compositions were grown by electrodeposition. The Co content in the final compound is linked to the initial Co/Zn ratio in the starting solution. X-ray diffraction reveals a wurtzite structure for the Zn 1−x Co x O films. Transmittance spectra show two effects proportional to Co content, a redshift of the absorption edge and three absorption bands, which are both interpreted to be due to the Co incorporated into the ZnO lattice. The amount of deposited charge was used to get a precise control of the film thickness. Magnetic measurements point out that Co͑II͒ ions are isolated from each other, and consequently the films are paramagnetic.

We report the synthesis of thin films of ZnCo2O4 and ZnMn2O4 spinels, as well as pure Co3O4 and Mn3O4 spinels, by means of electrodeposition. Spinel thin films have been analyzed by energy dispersive spectroscopy, X-ray diffraction, and Raman spectroscopy. We show that under certain deposition conditions, where the Co and Mn concentration in the films is above the solubility limit of these ions in the wurtzite structure, the initial wurtzite structure of Co-and Mn-doped ZnO develops into other compounds with spinel structure.

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