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Zinc oxide nanostructured layers by spray of zinc acetate solutions
|Jelena Klauson 1, Tatjana Dedova 1, Arvo Mere 1, Chantal Badre 2, Thierry Pauporte 3, Olga Volobujeva 1, Malle Krunks 1
1. Tallinn University of Technology, Department of Materials Science, (TUT), Ehitajate tee 5, Tallinn 19086, Estonia
The spray pyrolysis process is an attractive low cost technique for the deposition of metal oxide films. Zinc oxide thin films were deposited from zinc acetate aqueous and alcohol solutions at growth temperature ranging from 350 oC to 540 oC on glass and ITO substrates using continuous and pulsed spray modes. The deposited layers were characterised by optical spectra in the wavelength range of 300-800 nm, structural properties by XRD, surface morphology by SEM. Photoluminescence (PL) and wettability measurements were conducted as well. The use of continuous spray gave nanostructured ZnO layers which surface comprises conical needle-shape crystals with diameter of 30-70 nm and flower-like crystals. The diameter of the needles increased with growth of deposition temperature until they lose their shape at ~500 oC. Deposition of ZnO layers by pulsed spray or doping by indium results in dence and smooth films with no nanoneedles. The films with structured surface are more hydrophilic (CA=17o) than the flat ones obtained by pulsed spray or by doping (CA=55 and 32o). The reflectance and the transmittance of the films depend on the morphology. The band gap of the undoped films did not depend on the morphology and was Eg=3.28eV, with indium doped films it was Eg=3.33eV. Undoped films show the intensive near band edge (NBE) PL emission at room temperature indicating high purity of the film. PL emission did not depend on the film morphology.
Presentation: Oral at E-MRS Fall Meeting 2007, Symposium B, by Malle Krunks
See On-line Journal of E-MRS Fall Meeting 2007
Submitted: 2007-05-14 18:09 Revised: 2009-06-07 00:44