We thank Dr. Lars P. H. Jeurgens and Michaela Wieland for doing the XPS measurements, Maritta Dudek and Gerd Maier for recording the XRD diffractograms and pole figures, Sabine Kühnemann and Hartmut Labitzke for taking the SEM images, Peter Gerstel for the synthesis of the silanes and for general support in the Chemistry laboratory, and Prof. Lennart Bergström and Dr. Niklas Hedin for valuable discussions.
Site-Selective Deposition of Nanostructured ZnO Thin Films from Solutions Containing Polyvinylpyrrolidone†
Article first published online: 23 AUG 2007
Copyright © 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Functional Materials
Volume 17, Issue 13, pages 2151–2159, September, 2007
How to Cite
Lipowsky, P., Hoffmann, R. C., Welzel, U., Bill, J. and Aldinger, F. (2007), Site-Selective Deposition of Nanostructured ZnO Thin Films from Solutions Containing Polyvinylpyrrolidone. Adv. Funct. Mater., 17: 2151–2159. doi: 10.1002/adfm.200600399
- Issue published online: 23 AUG 2007
- Article first published online: 23 AUG 2007
- Manuscript Revised: 22 SEP 2006
- Manuscript Received: 5 MAY 2006
- Chemical vapor deposition;
- Thin films;
- Zinc oxide
When soluble zinc salts are hydrolyzed in water, usually elongated micrometer-sized zincite crystals are formed. In this study, polyvinylpyrrolidone (PVP) in a methanolic solution is used as an agent to control the morphology of the deposition product. It prevents crystal growth and yields zinc oxide nanocrystals. Thin films consisting of zinc oxide nanocrystals are formed on self-assembled monolayers (SAMs) of sulfonate-terminated alkylsiloxanes. Patterned films are deposited after local decomposition of the SAM by UV irradiation. The films fabricated from methanolic solutions containing PVP are particularly smooth, uniform and stable. Their thickness is determined by the deposition time and the molar ratio [PVP]:[Zn2+], so that films of arbitrary thickness and nearly constant roughness can be obtained. The crystal grains are oriented preferentially with 〈001〉 direction perpendicular to the substrate surface. The films show ultraviolet, orange-red and green-yellow photoluminescence; the latter is quenched by heat treatment. Based on the obtained experimental results, a deposition mechanism is suggested.