Journal
PHYSICA B-CONDENSED MATTER
Volume 406, Issue 19, Pages 3583-3587Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2011.06.041
Keywords
Barium titanate; Film; Sol-gel; Optical properties; Band structure; Band gap
Categories
Funding
- University of Chongqing, China
- Natural Science Foundation of Chongqing, China [CSTC2010BB4286]
- Research Foundation of Chongqing University of Science and Technology [CK2010Z05]
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Barium titanate (BTO) films were prepared by sol-gel spin-coating technique. The crystal structure and optical properties of BTO films have been investigated. The results indicate that the BTO films are single perovskite phase having tetragonal symmetry. The band gap of the BTO films increases with the increasing of layer number and decreasing of solution concentration. The transmittance and band gap of the BTO films annealed at 900 degrees C is more than that of the BTO films annealed at 700 degrees C when wavelength is 200-1000 nm. When wavelength is 400-1000 nm, the absorption coefficient alpha obtained by experiment is higher than that obtained by calculation (close to zero). (C) 2011 Elsevier B.V. All rights reserved.
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