期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 199, 期 -, 页码 34-41出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2012.11.014
关键词
Perovskite; Stannates; Chemical solution deposition; Polymeric precursor method; Epitaxial growth; Photoluminescence
资金
- French-Brazilian doctoral college
- CAPES-COFECUB [644/09]
- INCT/CNPq/MCT
- PROINFRA/FINEP/MCT
CaSnO3 and SrSnO3 alkaline earth stannate thin films were prepared by chemical solution deposition using the polymeric precursor method on various single crystal substrates (R- and C-sapphire and 100-SrTiO3) at different temperatures. The films were characterized by X-ray diffraction (theta-2 theta, omega- and (phi-scans), field emission scanning electron microscopy, atomic force microscopy, micro-Raman spectroscopy and photoluminescence. Epitaxial SrSnO3 and CaSnO3 thin films were obtained on SrTiO3 with a high crystalline quality. The long-range symmetry promoted a short-range disorder which led to photoluminescence in the epitaxial films. In contrast, the films deposited on sapphire exhibited a random polycrystalline growth with no meaningful emission regardless of the substrate orientation. The network modifier (Ca or Sr) and the substrate (sapphire or SrTiO3) influenced the crystallization process and/or the microstructure. Higher is the tilts of the SnO6 octahedra, as in CaSnO3, higher is the crystallization temperature, which changed also the nucleation/grain growth process. (C) 2012 Elsevier Inc. All rights reserved.
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