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Preparation and optical properties of barium titanate thin films |
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| Authors: | Wei Cai Chunlin FuJiacheng Gao Qian GuoXiaoling Deng Chaoyang Zhang |
| Institution: | a School of Metallurgical and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China b College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China c Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), Mianyang, Sichuan 621900, China |
| Abstract: | 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 °C is more than that of the BTO films annealed at 700 °C when wavelength is 200-1000 nm. When wavelength is 400-1000 nm, the absorption coefficient α obtained by experiment is higher than that obtained by calculation (close to zero). |
| Keywords: | Barium titanate Film Sol-gel Optical properties Band structure Band gap |
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