Growth of ultra-thin TiO2 films by spray pyrolysis on different substrates

被引:51
作者
Acik, I. Oja [1 ]
Junolainen, A. [1 ]
Mikli, V. [2 ]
Danilson, M. [1 ]
Krunks, M. [1 ]
机构
[1] Tallinn Univ Technol, Dept Mat Sci, EE-19086 Tallinn, Estonia
[2] Tallinn Univ Technol, Ctr Mat Res, EE-19086 Tallinn, Estonia
关键词
TiO2; Spray pyrolysis; Film growth; Thin film; AFM; XPS; NANOSTRUCTURED SOLAR-CELL; CHARGE RECOMBINATION; LAYER;
D O I
10.1016/j.apsusc.2009.08.101
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In the present study TiO2 films were deposited by spray pyrolysis method onto ITO covered glass and Si (1 0 0) substrates. The spray solution containing titanium(IV) isopropoxide, acetylacetone and ethanol was sprayed at a substrate temperature of 450 degrees C employing 1-125 spray pulses (1 s spray and 30 s pause). According to AFM, continuous coverage of ITO and Si substrates with TiO2 layer is formed by 5-10 and below 5 spray pulses, respectively. XPS studies revealed that TiO2 film growth on Si substrate using up to 4 spray pulses follows 2D or layer-by-layer-growth. Above 4 spray pulses, 3D or island growth becomes dominant irrespective of the substrate. Only 50 spray pulses result in TiO2 layer with the thickness more than XPS measurement escape depth as any signal from the substrate could not be detected. TiO2 grain size remains 30 nm on ITO and increases from 10-20 nm to 50-100 nm on Si substrate with the number of spray pulses from 1 to 125. (C) 2009 Elsevier B. V. All rights reserved.
引用
收藏
页码:1391 / 1394
页数:4
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