Effect of Zn-doping on the structural and optical properties of BaTiO3 thin films grown by pulsed laser deposition

被引：40

作者：

Fasasi, A. Y. ^{[1
,2
]}

Maaza, M. ^{[2
]}

Rohwer, E. G. ^{[3
]}

Knoessen, D. ^{[4
]}

Theron, Ch. ^{[2
]}

Leitch, A. ^{[5
]}

Buttner, U. ^{[6
]}

机构：

[1] Obafemi Awolowo Univ, Ctr Energy Res & Dev, Ife, Osun State, Nigeria

[2] Natl Res Fdn, iThemba LABS, Nanosci Labs, Mat Res Grp, ZA-7129 Somerset W, South Africa

[3] Univ Stellenbosch, Dept Phys, Laser Res Inst, ZA-7600 Stellenbosch, Western Cape, South Africa

[4] Univ Western Cape, Dept Phys, Bellville, South Africa

[5] Nelson Mandela Metropolitan Univ, Dept Phys, Port Elizabeth, South Africa

[6] Univ Stellenbosch, Dept Elect Engn, ZA-7600 Stellenbosch, Western Cape, South Africa

来源：

THIN SOLID FILMS | 2008年 / 516卷 / 18期

关键词：

barium titanate; zinc oxide; optical properties; band gap; refractive index dispersion; laser ablation;

D O I：

10.1016/j.tsf.2007.11.123

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Thin films of zinc oxide doped barium titanate (BaZnxTi1-xO3) have been prepared by pulsed laser ablation using different targets having zinc composition varying between x=1 to 5 wt.% at a step of 1 wt.% on coming glass microscope slide and silicon substrates. X-ray diffraction analyses showed films to be of tetragonal phase with an average grain size of 20 nm and c/a ratio of 1.08 indicating lattice expansion due to ZnO incorporation. Atomic force microscopy studies of the prepared thin films indicated smooth surfaces with average roughness of 1.84 and 4.6 nm for as-deposited and sintered specimens respectively. Scanning electron microscopy showed films to be smooth and uniform. UV-Visible as well as Fourier Transform Infrared transmission measurements showed a transmission of more than 80% in the visible and 5-20% in the near infrared. The transmittance is strongly affected by annealing. There is a dependence of band gap energy on film thickness as well as on the amount of ZnO added. High ZnO dopant level led to an increase in the band gap. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：6226 / 6232

页数：7

共 34 条

[1] SPUTTER DEPOSITION OF HIGHLY (100 + 001)-TEXTURED TETRAGONAL BARIUM-TITANATE ON UNHEATED SILICA USING A NEON DISCHARGE [J].