Please use this identifier to cite or link to this item: doi:10.22028/D291-24219
Title: Optical, electrical and structural properties of sol gel ZnO:Al coatings
Author(s): Schuler, Thomas
Aegerter, Michel A.
Language: English
Year of Publication: 1999
OPUS Source: Thin solid films. - 351. 1999, S. 125-131
SWD key words: Zink
Elektrische Eigenschaft
Optische Eigenschaft
DDC notations: 620 Engineering and machine engineering
Publikation type: Journal Article
Abstract: Single and multilayer transparent conducting aluminium doped zinc oxide films have been prepared on DESAG AF45 substrates by the sol gel dip coating process. Zinc acetate solutions of 0.1-0.5 M in isopropanol stabilised by diethanolamine and doped with a concentrated solution of aluminium nitrate in ethanol were used. Each layer was fired at 600°C in a conventional furnace for 15 min. The final coatings were then tempered under a flux of forming gas (N2/H2) at 400°C for 2 h. The coatings have been characterised by surface stylus profiling, optical spectroscopy (UV-NIR), X-ray diffraction (XRD), transmission electron microscopy (TEM) and combined Hall and van der Pauw techniques. Single layers with thickness, d, ranging from 25 to 186 nm are polycrystalline with the zincite structure and exhibit a small preferential orientation with the (002) direction perpendicular to the surface (texture coefficient, TC, ranging from 1.8 to 2.8). They consist of almost spherical particles with size ranging from 15 to 25 nm (thin sample) to 40 nm (thick sample) with crystallite sizes ranging from 23 to 40 nm (002), respectively. The film resistivity decreases from 5 x 10-1 Ω cm (d=25 nm) to 4 x 10-2 Ω cm (d=186 nm). Multilayer coatings built with about 20 nm thick layers are also slightly textured along the (002) direction (TC ranging from 1.9 to 2.8). A structural evolution in morphology from spherical to columnar growth was observed. The crystallite size calculated from the (002) reflex increases with the number of layers from 23 nm for a single layer to over 100 nm for ten layers. The resistivity decreases from 5 x 10-1 Ω cm for a single layer to 5 x 10-3 Ω cm for ten layers (d=174 nm). A model for the growth of the crystallites in sol gel multilayer coatings is presented.
Link to this record: urn:nbn:de:bsz:291-scidok-24546
Date of registration: 19-Nov-2009
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
SciDok - Der Wissenschaftsserver der Universität des Saarlandes

Files for this record:
File Description SizeFormat 
aeg199902.pdf1,79 MBAdobe PDFView/Open

Items in SciDok are protected by copyright, with all rights reserved, unless otherwise indicated.