Influence of the network modifier on the characteristics of MSnO3 (M=Sr and Ca) thin films synthesized by chemical solution deposition

Journal of Solid State Chemistry Volume: 199 Pages: 34-41 Published: 2012

AFM images of the SrSnO3 thin film synthesized at 600 ºC on STO. (a) 5 x 5 μm² analyzed area; (b) 1 x 1 μm² analyzed area.

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Writers: M.C.F. Alves; R.M.M. Marinho; G.P. Casali; M. Siu-Li; S. Députier; M. Guilloux-Viry; A.G. Souza; E. Longo; I.T. Weber; I.M.G. Santos

Keywords: Perovskite; Stannates; Chemical solution deposition; Polymeric precursor method; Epitaxial growth; Photoluminescence

Abstract: 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 (θ–2θ, ω- and φ-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.

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