The mechanism of low temperature deposition of crystalline anatase by reactive DC magnetron sputtering

Barnes, Mark C., Kumar, Sunil, Green, Len, Hwang, Nong-Moon, and Gerson, Andrea R. (2005) The mechanism of low temperature deposition of crystalline anatase by reactive DC magnetron sputtering. Surface and Coatings Technology, 190 (2-3). pp. 321-330.

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Abstract

It has been reported that TiO2 film deposition by direct current (DC) magnetron reactive sputtering can occur according to the mechanism proposed by the theory of charged clusters (TCC). In the current study, the TCC was used to explain the mechanism of low temperature TiO2 crystalline thin film growth. Highly oriented anatase thin films were deposited on unheated substrates. The degree of crystallinity of the thin film was found to depend on the cluster size and its crystallinity as well as the charging efficiency in the reactor. Larger clusters tend to be crystalline. These produce amorphous (nanocrystalline) films. Smaller clusters tend to be amorphous and adopt the structure of clusters already deposited to produce an ordered crystalline film. Increasing the substrate-to-target distance increased the cluster size. In addition, the charge density decreased as the target to substrate distance was increased. Clusters of <2 and 3 nm in diameter were observed at a substrate-to-target distance of 50 and 250 mm, respectively, which correspondingly produced crystalline and amorphous films. The DC power level did not appear to have a large effect on the cluster size nor did it affect the degree of crystallinity of the resulting thin film. The main factors affecting whether or not a crystalline film is deposited are the cluster size and the charge density in the reactor.

Item ID: 38180
Item Type: Article (Refereed Research - C1)
Keywords: nanostructures; sputtering; clusters; titanium oxide
ISSN: 1879-3347
Funders: Australian Research Council (ARC)
Date Deposited: 09 Apr 2015 02:51
FoR Codes: 02 PHYSICAL SCIENCES > 0204 Condensed Matter Physics > 020406 Surfaces and Structural Properties of Condensed Matter @ 50%
10 TECHNOLOGY > 1007 Nanotechnology > 100706 Nanofabrication, Growth and Self Assembly @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970110 Expanding Knowledge in Technology @ 50%
97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 50%
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